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Christopher Michael Johns-Krull
Professor
Professor in Physics and Astronomy
 
e-mail:cmj@rice.edu
 
  • B.S. in Physics (1989) UT Austin
  • B.A. in Math (1989) UT Austin
  • M.A. in Astronomy (1991) UC Berkeley
  • Ph.D. in Astronomy (1994) UC Berkeley
 
Primary Department
   Department of Physics and Astronomy
Picture
 
Department Affiliations
 
  • Department of Physics and Astronomy
  • Rice Space Institute
  •  
    Websites
     Personal Webpage
     Personal homepage
     
    Research Areas
     Star formation and early stellar evolution. Solar and stellar magnetic activity. Extra-solar planets.
     
    Teaching Areas
     introductory astronomy, advanced undergraduate and graduate stellar astrophysics, observational astronomy
     
    Selected Publications
     Abstracts
     

    Cauley, P.W. & Johns–Krull, C.M. "Using He I 10830 to Diagnose Mass Flows Around Herbig Ae/Be Stars." American Astronomical Society Meeting, 225 (2015) : 414.02.

     
     

    Kowalski, A.F., Hawley, S.L., Johns–Krull, C.M., Schmidt, S.J., Brown, A., Wisniewski, J.P., Davenport, J.R.A., Farina, C., Pietro Gentile Fusillo, N., Xilouris, M., Mathioudakis, M., Osten, R.A., Holtzman, J.A., Phan–Bao, N., Valenti, J.A., & Walkowicz, L. "Time-Resolved Near-Ultraviolet Flare Spectra with the Hubble Space Telescope / Cosmic Origins Spectrograph." American Astronomical Society Meeting, 225 (2015) : 449.03.

     
     

    Ardila, D.R., Herczeg, G., Johns–Krull, C. M., Mathieu, R.D., Vodniza, A., & Tofflemire, B.M. "Accretion as a function of Orbital Phase in Young Close Binaries." American Astronomical Society Meeting, 223 (2014) : 424.07.

     
     

    Ciardi, D.R., Beichman, C.A., Carey, S.J., Crockett, C., Johns–Krull, C.M., Kane, S.R., McLane, J., Plavchan, P., Prato, L.A., Stauffer, J.R., van Belle, G., Van Eyken, J. C., & von Braun, K. "Observations of the Pre-Main Sequence Exoplanet Candidate PTFO 8-8695." American Astronomical Society Meeting, 223 (2014) : 430.03.

     
     

    Kimock, B., Hamilton, C. M., James, D., & Johns–Krull, C. M. "Rotational Velocities of PMS Stars In NGC2362." American Astronomical Society Meeting, 223 (2014) : 442.07.

     
     

    Johns-Krull, Christopher M., Chen, W., Valenti, J. A., Jeffers, S. V., Piskunov, N. E., Kochukhov, O., Makaganiuk, V., Stempels, H. C., Snik, F., Keller, C., & Rodenhuis, M. "HARPS Spectropolarimetry of the Classical T Tauri Stars GQ Lup and TW Hya." American Astronomical Society Meeting Abstracts, 221: 256.14.

     
     

    Ardila, David R., Herczeg, G., Gregory, S. G., Ingleby, L., France, K., Brown, A., Edwards, S., Linsky, J., Yang, H., Valenti, J. A., Johns-Krull, C. M., Alexander, R., Bergin, E. A., Bethell, T., Brown, J., Calvet, N., Espaillat, C., Hervé, A., Hillenbrand, L., Hussain, G., Roueff, E., Schindhelm, E., Walter, F. M. "Hot Gas Flows in T Tauri Stars." Bulletin of the American Astronomical Society, 221 (2013) : 117.04.

     
     

    Cauley, Paul W., Hartigan, P. M., Johns-Krull, C. M. "Unveiling and Dereddening Classical T Tauri Stars Using Simultaneous UV and Optical Spectra." Bulletin of the American Astronomical Society, 221 (2013) : 256.21.

     
     

    Crockett, Christopher, Mahmud, N., Prato, L. A., Johns-Krull, C. M., Jaffe, D. T., Hartigan, P. M., Beichman, C. A. "Giant Planet Companions to T Tauri Stars." Bulletin of the American Astronomical Society, 221 (2013) : 149.02.

     
     

    Crockett, Christopher, Mahmud, N., Prato, L., Johns-Krull, C., Jaffe, D. T., Hartigan, P., Beichman, C. A. "Giant Planet Companions to T Tauri Stars." Bulletin of the American Astronomical Society, 219 (2012) : 228.04.

     
     

    Johns-Krull, Christopher M., Benedict, G. F., Mahmud, N., McArthur, B., McCullough, P., Valenti, J. A. "Hst Parallax Of XO-3 And Implications For The Structure Of Its Hot Jupiter." Bulletin of the American Astronomical Society, 219 (2012) : 245.17.

     
     

    Johns-Krull, Christopher M., Chen, W., Valenti, J. A., Jeffers, S. V., Piskunov, N. E., Kochukhov, O., Makaganiuk, V., Stempels, H. C., Snik, F., Keller, C., Rodenhuis, M. "HARPS Spectropolarimetry of the Classical T Tauri Stars GQ Lup and TW Hya." Bulletin of the American Astronomical Society, 221 (2013) : 256.14.

     
     
    Crockett, C., Mahmud, N., Prato, L., et al. 2011, "Searching For The Youngest Planets With CSHELL," Bulletin of the American Astronomical Society, 43, 253.13 
     
     
    DeRoo, C., Prato, L., Skiff, B., et al. 2011, "Determining Rotational Periods with Relative Photometry: V836 Tauri & BP Tauri," Bulletin of the American Astronomical Society, 43, #343.01 

     
     
    Mahmud, N., Crockett, C., Johns-Krull, C., et al. 2011, "Brown Dwarfs and Giant Planets Around Young Stars," Bulletin of the American Astronomical Society, 43, #253.14 
     
     
    Sokol, J., Herbst, W., Emery, J.P., et al. 2011, "Near-infrared Spectroscopy of KH 15D," Bulletin of the American Astronomical Society, 
    43, \#340.01
     
     
    Brown, A., et al. 2010, Bulletin of the American Astronomical Society, 42, 684
     
     
    Crockett, C., Mahmud, N., Prato, L., Johns-Krull, C. M., Jaffe, D. T., & Hartigan, P. 2010, Bulletin of the American Astronomical Society, 42, 286
     
     
    Herbst, W., LeDuc, K., Hamilton, C. M., Winn, J. N., Ibraghimov, M., Mundt, R., & Johns-Krull, C. M. 2010, American Astronomical Society Meeting Abstracts, 216, #422.03
     
     
    Johns-Krull, C. M., & Valenti, J. A. 2010, Highlights of Astronomy, 15, 524
     
     

    Burke, C.J. et al. "XO-2b: A Transiting Hot Jupiter in a Metal-rich Common Proper Motion Binary." , 210 (2007) : 33.02.

     
     

    Huerta, M., Hartigan, P., Prato, L., Johns-Krull, C.M., Jaffe, D. "A Search for Low Mass Companions and a New Determination of Effective Temperature for T-Tauri Stars." , 210 (2007) : 36.04.

     
     

    Jekielek, K., Hamilton, C.M., Johns-Krull, C.M. "Fast Rotators in NGC 2362." , 210 (2007) : 16.08.

     
     

    Johns-Krull, C.M. et al. "The Unusual Transiting Extra-Solar Planet Orbiting XO-3." , 210 (2007) : 96.05.

     
     

    Johns-Krull, C.M., Greene, T.P., Doppmann, G., Covey, K.R. "The Magnetic Field of the Class I Protostar WL 17." , 210 (2007) : 62.17.

     
     

    Lockhart, K., Johns-Krull, C.M., Stassun, K.G., Mack, C. "Accretion of Classical T Tauri Stars in the Orion Nebula and NGC 2264." , 210 (2007) : 87.03.

     
     

    Walkowicz, L., Johns-Krull, C.M., Hawley, S.L. "Characterizing The Near-UV Environment Of M Dwarfs." , 210 (2007) : 17.05.

     
     

    Yang, H., Johns-Krull, C.M. "The Magnetic Fields on T Tauri Stars in the Orion Nebula Cluster." , 210 (2007) : 62.19.

     
     Refereed articles
     

    Biddle, Lauren I.; Johns-Krull, Christopher M.; Llama, Joe; Prato, Lisa; Skiff, Brian A. "K2 reveals pulsed accretion driven by the 2 Myr old hot Jupiter CI Tau b." The Astrophysical Journal LettersSubmitted

     
     

    Lavail, A.; Kochukhov, O.; Hussain, G. A. J.; Alecian, E.; Herczeg, G. J.; Johns-Krull, C. "Magnetic fields of intermediate mass T Tauri stars." Astronomy & Astrophysics, 608: 77-84.

     
     

    Tofflemire, Benjamin M.; Mathieu, Robert D.; Ardila, David R.; Akeson, Rachel L.; Ciardi, David R.; Johns-Krull, Christopher; Herczeg, Gregory J.; Quijano-Vodniza, Alberto "Accretion and Magnetic Reconnection in the Classical T Tauri Binary DQ Tau." The Astrophysical Journal, 835: 8-23.

     
     

    Ardila, D.R., Johns–Krull, C.M., Herczeg, G.J., Mathieu, R., & Quijano–Vodniza, A. "Magnetospheric Accretion in Close Pre-Main-Sequence Binaries." The Astrophysical Journal (2015) In Press

     
     

    Arulanantham, N.A., Herbst, W., Cody, A.M., Stauffer, J.R., Rebull, L.M., Agol, E., Windemuth, D., Marengo, M., Winn, J.N., Hamilton, C.M., Mundt, R., Johns–Krull, C.M., & Gutermuth, R.A. "Seeing Through the Ring: Near-Infrared Photometry of V582 Mon (KH 15D)." The Astronomical Journal (2015) In Press

     
     

    Cauley, P.W. & Johns–Krull, C.M. "Investigating the Origin of Hot Gas Lines in Herbig Ae/Be Stars." The Astrophysical Journal (2015) Submitted

     
     

    Cauley, P.W. & Johns–Krull, C.M. "Optical Mass Flow Diagnostics in Herbig Ae/Be Stars." The Astrophysical Journal, 810 (2015) : 5.

     
     

    Ciardi, D.R., van Eyken, J.C., Barnes, J.W., Beichman, C.A., Carey, S.J., Crockett, C.J., Eastman, J., Johns–Krull, C.M., Howell, S.B., Kane, S.R., McLane, J., Plavchan, P., Prato, L., Stauffer, J., van Belle, G.T., & von Braun, K. "Confirmation of the Orbital Precession and the Planetary Status of PTFO 8-8695b: A Jupiter-Mass Planet Orbiting a 3 Myr Old T-Tauri Star." The Astrophysical Journal, 809 (2015) : 42.

     
     

    Johns–Krull, C.M., McLane, J.N., Prato, L., Crockett, C.J., Jaffe, D.T., Hartigan, P.M., Beichman, C.A., Mahmud, N.I., Chen, W., Skiff, B.A., Cauley, P.W., Jones, J.A., & Mace, G.N. "A Search for A Young Massive Planet in Orbit Around the T Tauri Star CI Tau." The Astrophysical Journal (2015) In Revision

     
     

    Johns–Krull, C.M., Prato, L., McLane, J., Ciardi, D.R., van Eyken, J.C., Chen, W., Stauffer, J.R., Beichman, C.A., Frazier, S.A., Boden, A.F., Morales–Calderon, M., & Rebull, L. "H-alpha Variability in PTFO8-8695 and the Possible Direct Detection of Emission from a 2 Million Year Old Evaporating Hot Jupiter." The Astrophysical Journal (2015) In Revision

     
     

    Kochukhov, O., Rusomarov, N., Valenti, J. A., Stempels, H. C., Snik, F., Rodenhuis, M., Piskunov, N., Makaganiuk, V., Keller, C. U., Johns-Krull, C. M. "Magnetic field topology and chemical spot distributions in the extreme Ap star HD 75049." Astronomy & Astrophysics, 574 (2015) : 79.

     
     

    Cauley, P.W. & Johns–Krull, C.M. "Diagnosing Mass Flows Around Herbig Ae/Be Stars Using the He I 10830 Line." The Astrophysical Journal, 797 (2014) : 112.

     
     

    McArthur, B.E., Benedict, G.F., Henry, G.W., Hatzes, A., Cochran, W.D., Harrison, T.E., Johns–Krull, C., & Nelan, E. "Astrometry, Radial Velocity and Photometry: The HD 128311 System Remixed with Data from HST, HET, and T12 APT." The Astrophysical Journal, 795 (2014) : 41.

     
     

    Ardila, David R., Herczeg, Gregory J., Gregory, Scott G., Ingleby, Laura, France, Kevin, Brown, Alexander, Edwards, Suzan, Johns-Krull, Christopher, Linsky, Jeffrey L., Yang, Hao, Valenti, Jeff A., Abgrall, Hervé, Alexander, Richard D., Bergin, Edwin, Bethell, Thomas, Brown, Joanna M., Calvet, Nuria, Espaillat, Catherine, Hillenbrand, Lynne A., Hussain, Gaitee, Roueff, Evelyne, Schindhelm, Eric R., & Walter, Frederick M. "Hot Gas Lines in T Tauri Stars." The Astrophysical Journal Supplement Series, 207: 1.

     
     

    Chen, Wei, & Johns-Krull, Christopher M. "Spectropolarimetry of the Classical T Tauri Star BP Tau." The Astrophysical Journal, 776: 113.

     
     

    Johns-Krull, Christopher M., Chen, Wei, Valenti, Jeff A., Jeffers, Sandra V., Piskunov, Nikolai E., Kochukhov, Oleg, Makaganiuk, V., Stempels, H. C., Snik, Frans, Keller, Christoph, & Rodenhuis, M. "Magnetically Controlled Accretion on the Classical T Tauri Stars GQ Lupi and TW Hydrae." The Astrophysical Journal, 765: 11.

     
     

    Kochukhov, O., Makaganiuk, V., Piskunov, N., Jeffers, S. V., Johns-Krull, C. M., Keller, C. U., Rodenhuis, M., Snik, F., Stempels, H. C., & Valenti, J. A. "Are there tangled magnetic fields on HgMn stars?." Astronomy & Astrophysics, 554: 61.

     
     

    Rusomarov, N., Kochukhov, O., Piskunov, N., Jeffers, S. V., Johns-Krull, C. M., Keller, C. U., Makaganiuk, V., Rodenhuis, M., Snik, F., Stempels, H. C., & Valenti, J. A. "Three-dimensional magnetic and abundance mapping of the cool Ap star HD 24712 . I. Spectropolarimetric observations in all four Stokes parameters." Astronomy & Astrophysics, 558: 8.

     
     

    Cauley, P. Wilson, Johns-Krull, Christopher M., Hamilton, Catrina M., Lockhart, Kelly "Testing Disk-locking in NGC 2264." The Astrophysical Journal, 756 (2012) : 68.

     
     

    Crockett, Christopher J., Mahmud, Naved I., Prato, L., Johns-Krull, Christopher M., Jaffe, Daniel T., Hartigan, Patrick M., Beichman, Charles A. "A Search for Giant Planet Companions to T Tauri Stars." The Astrophysical Journal, 761 (2012) : 164.

     
     

    Hamilton, Catrina M., Johns-Krull, Christopher M., Mundt, Reinhard, Herbst, William, Winn, Joshua N. "Complex Variability of the Hα Emission Line Profile of the T Tauri Binary System KH 15D: The Influence of Orbital Phase, Occultation by the Circumbinary Disk, and Accretion Phenomena." The Astrophysical Journal, 751 (2012) : 147.

     
     

    Johns-Krull, C. M., Chen, W., Valenti, J. A., Jeffers, S. V., Piskunov, N. E., Kuchukhov, O., Makaganiuk, V., Stempels, H. C., Snik, F., Keller, C., Rodenhuis, M. "Magnetically Controlled Accretion on the Classical T Tauri Stars GQ Lupi and TW Hydrae." The Astrophysical JournalIn Press

     
     

    Makaganiuk, V., Kochukhov, O., Piskunov, N., Jeffers, S. V., Johns-Krull, C. M., Keller, C. U., Rodenhuis, M., Snik, F., Stempels, H. C., Valenti, J. A. "Magnetism, chemical spots, and stratification in the HgMn star ϕ Phoenicis." Astronomy & Astrophysics, 539 (2012) : 142.

     
     

    Yang, Hao, Herczeg, Gregory J., Linsky, Jeffrey L., Brown, Alexander, Johns-Krull, Christopher M., Ingleby, Laura, Calvet, Nuria, Bergin, Edwin, Valenti, Jeff A. "A Far-ultraviolet Atlas of Low-resolution Hubble Space Telescope Spectra of T Tauri Stars." The Astrophysical Journal, 744 (2012) : 121.

     
     
    France, K., Schindhelm, E., Burgh, E.B., et al. 2011, "The Far-ultraviolet "Continuum" in Protoplanetary Disk Systems. II. Carbon Monoxide Fourth Positive Emission and Absorption," ApJ, 734, 31
     
     
    Kochukhov, O., Makaganiuk, V., Piskunov, N., et al.\ 2011, "No magnetic field in the spotted HgMn star μ Leporis," A&A, 534, L13
     
     
    Mahmud, N.I., Crockett, C.J., Johns-Krull, C.M., et al. 2011, "Starspot-induced Optical and Infrared Radial Velocity Variability in T Tauri Star Hubble I 4," ApJ, 736, 123 
     
     
    Yang, H., Herczeg, G.~J., Linsky, J.~L., et al. 2012, "A Far-ultraviolet Atlas of Low-resolution Hubble Space Telescope Spectra of T Tauri Stars," ApJ, in press
     
     
    Makaganiuk, V., Kochukhov, O., Piskunov, N., et al. 2011, "Chemical spots in the absence of magnetic field in the binary HgMn star 66 Eridani," A&A, 529, A160 
     
     
    Piskunov, N., Snik, F., Dolgopolov, A., et al. 2011, "HARPSpol — The New Polarimetric Mode for HARPS," The Messenger, 143, 7
     
     
    Ingleby, L., Calvet, N., Bergin, E., et al. 2011, "Near-ultraviolet Excess in Slowly Accreting T Tauri Stars: Limits Imposed by Chromospheric Emission," ApJ, 743, 105
     
     
    Makaganiuk, V., Kochukhov, O., Piskunov, N., et al. 2011, "Magnetism, chemical spots, and stratification in the HgMn star phi Phoenicis," arXiv:1111.6065 
     
     

    Chen, W. and Johns-Krull, C.M. 2012, "Spectropolarimetry of the Classical T Tauri Star BP Tauri," ApJ, submitted

     
     
    Crockett, C.J., Mahmud, N.I., Prato, L., et al. 2011, "Precision Radial Velocities with CSHELL," ApJ, 735, 78
     
     

    Hamilton, C.M., Johns-Krull, C.M., Mundt, R., et.al. 2012, "Complex Variability of the Hα Emission Line Profile of the T Tauri Binary System KH 15D: The Influence of Orbital Phase, Occultation by the Circumbinary Disk, and Accretion Phenomenae," ApJ, submitted

     
     
    Kochukhov, O., Makaganiuk, V., Piskunov, N., et al. 2011, "First Detection of Linear Polarization in the Line Profiles of Active Cool Stars," ApJL, 732, L19
     
     
    Makaganiuk, V., Kochukhov, O., Piskunov, N., et al. 2011, "The search for magnetic fields in mercury-manganese stars," A&A, 525, A97
     
     
    Yang, H., & Johns-Krull, C.M. 2011, "Magnetic Field Measurements of T Tauri Stars in the Orion Nebula Cluster," ApJ, 729, 83 
     
     
    Machalek, P., Greene, T., McCullough, P. R., Burrows, A., Burke, C. J., Hora, J. L., Johns-Krull, C. M., & Deming, D. L. 2010, ApJ, 711, 111 
     
     
    Burke, C. J., et al. 2010, ApJ, 719, 1796 
     
     

    Crockett, C., Mahmud, N., Prato, L., Johns-Krull, C. M., Jaffe, D., & Beichman, C. 2011, ApJ, submitted

     
     
    Herbst, W., LeDuc, K., Hamilton, C. M., Winn, J. N., Ibrahimov, M., Mundt, R., & Johns-Krull, C. M. 2010, AJ, 140, 2025 
     
     
    Lawler, S. M., Herbst, W., Redfield, S., Hamilton, C. M., Johns-Krull, C. M., Winn, J. N., 
    Johnson, J. A., & Mundt, R. 2010, ApJ, 711, 1297
     
     

    Magaganiuk, V. et al. 2011, A&A, submitted

     
     
    Makaganiuk, V., et al. 2011, A&A, in press.
     
     
    Mundt, R., Hamilton, C. M., Herbst, W., Johns-Krull, C. M., & Winn, J. N. 2010, ApJ Letters, 708, L5
     
     

    Yang, H. & Johns-Krull, C. M. 2011, ApJ, in press

     
     

    Johns–Krull, C.M., Greene, T.P., Doppmann, G.W., and Covey, K.R. 2009 “First Detection of a Magnetic Field on a Class I Protostar” in, Astrophys. J., 700, 1440.

     
     

    Lawler, S.M., Herbst, W., Redfield, S., Hamilton, C.M., Johns–Krull, C.M., Winn, J.N., Johnson, J.A., and Mundt, R. 2010 “Gas Absorption in the KH 15D System: Further Evidence for Dust Settling in the Circumbinary Disk” in, Astrophys. J., submitted.

     
     

    Machalek, P., Greene, T., McCullough, P.R., Burrows, A., Burke, C.J., Hora, J.L., Johns–Krull, C.M., and Deming, D.L. 2010 “Thermal Emission and Tidal Heating of the Heavy and Eccentric Planet XO-3b” in, Astrophys. J., in press.

     
     

    Machalek, P., McCullough, P.R., Burrows, A., Burke, C.J., Hora, J.L., and Johns– Krull, C.M. 2009 “Detection of Thermal Emission of XO-2b: Evidence for a Weak Temperature Inversion” in, Astrophys. J., 701, p. 514.

     
     

    Mundt, R., Hamilton, C.M., Herbst, W., Johns–Krull, C.M., and Winn, J.N. 2010 “Bipolar Jets Produced by a Spectroscopic Binary” in, Astrophys. J. Lett., 708, L5.

     
     

    Phan-Bao, N., Lim, J., Donati, J.-F., Johns–Krull, C.M., and Martin, E.L. 2009, “Magnetic Field Topology in Low-Mass Stars: Spectropolarimetric Observations of M Dwarfs” in, Astrophys. J., 704, p. 1721.

     
     

    Prato, L., Lockhart, K.E., Johns–Krull, C.M., and Rayner, J.T. 2009 “Stellar and Circumstellar Properties of Class I Prototstars” in, Astronom. J., 137, 3931.

     
     

    Berger, E. et al. "Simultaneous Multi-Wavelength Observations of Magnetic Activity in Ultracool Dwarfs. I. The Complex Behavior of the M8.5 Dwarf TVLM513-46546." The Astrophysical Journal (2008) : 1080-1087.

     
     

    Berger, E. et al. "Simultaneous Multi-Wavelength Observations of Magnetic Activity in Ultracool Dwarfs. II. Mixed Trends in VB10 and LSR1835+32 and the Possible Role of Rotation." The Astrophysical Journal (2008) : 1307-1318.

     
     

    Burke, C.J. et al. "XO-5b: A Transiting Jupiter-sized Planet with a Four Day Period." The Astrophysical Journal, 686 (2008) : 1331-1340.

     
     

    Herbst, W., Hamilton, C.M., LeDuc, K., Winn, J.E., Johns-Krull, C.M., Mundt, R., & Ibrahimov, M. "Reflected Light from Sand Grains in the Terrestrial Zone of a Protoplanetary Disk." Nature, 452 (2008) : 194-197.

     
     

    Huerta, M., Johns-Krull, C.M., Prato, L., Hartigan, P., Jaffe, D.T. "Star Spot Induced Radial Velocity Variability in LkCa 19." The Astrophysical Journal (2008) : 472-482.

     
     

    Johns-Krull, C.M. et al. "XO-3b: A Massive Planet in an Eccentric Orbit Transiting an F5V Star." The Astrophysical Journal (2008) : 657-670.

     
     

    Johns-Krull, C.M., Greene, T.P., Doppmann, G.W., & Covey, K.R. "First Detection of a Magnetic Field on a Class I Protostar." The Astrophysical Journal (2008) Submitted

     
     

    McCullough, P.R. et al. "XO-4b: An Extrasolar Planet Transiting an F5V Star." The Astrophysical Journal (2008) In Press

     
     

    Prato, L., Huerta, M., Johns-Krull, C.M., Mahmud, N., Jaffe, D.T., & Hartigan, P. "A Young Planet Search in Visible and IR Light: DN Tau, V836 Tau, and V827 Tau." The Astrophysical Journal, 687 (2008) : L103-L106.

     
     

    Prato, L., Lockhart, K.E., Johns-Krull, C.M., & Rayner, J.T. "Stellar and Circumstellar Properties of Class I Protostars." The Astronomical Journal (2008) Submitted

     
     

    Walkowicz, L., Johns-Krull, C.M., Hawley, S.L. "Characterizing the Near-UV Environment of M Dwarfs." The Astrophysical Journal (2008) : 593-606.

     
     

    Winn, J.N. et al. "The Transit Light Curve Project. IX. Evidence for a Smaller Radius of the Exoplanet XO-3b." The Astrophysical Journal, 683 (2008) : 1076-1084.

     
     

    Yang, H., Johns-Krull, C.M., & Valenti, J.A. "Magnetic Properties of Young Stars in the TW Hydrae Association." The Astronomical Journal, 136: 2286-2294.

     
     

    Burke, C.J. et al. "XO-2b: Transiting Hot Jupiter in a Metal-rich Common Proper Motion Binary." The Astrophysical Journal, 671 (2007) : 2115-2128.

     
     

    Johns-Krull, C.M. "The Magnetic Fields of Classical T Tauri Stars." The Astrophysical Journal, 664 (2007) : 975-985.

     
     

    Johns-Krull, C.M. & Herczeg, G.J. "How Hot is the Wind from TW Hydrae?." The Astrophysical Journal, 655 (2007) : 345-350.

     
     

    Yang, H., Johns-Krull, C.M., Valenti, J.A. "Spectropolarimetry of the Classical T Tauri Star TW Hydrae." The Astronomical Journal, 133 (2007) : 73-80.

     
     

    Bean, J.L., Sneden, C., Hauschildt, P.H., Johns-Krull, C.M., & Benedict, G.F. "Accurate M Dwarf Metallicities from Spectral Synthesis: A Critical Test of Model Atmospheres." The Astrophysical Journal, 652 (2006, December) : 1604-1616.

     
     

    Brown, J.C., Emslie, A.G., Holman, G.D., Johns-Krull, C.M., Kontar, E.P., Lin, R.P., Massone, A.M., and Piana, M. "Evaluation of Algorithms for Reconstructing Electron Spectra from their Bremsstrahlung Hard X-ray Spectra." The Astrophysical Journal, 643 (2006, May) : 523-531.

     
     

    Daou, A.G., Johns-Krull, C.M., and Valenti, J.A. "Spectropolarimetry of the Classical T Tauri Star T Tauri." The Astronomical Journal, 131 (2006, January) : 520-526.

     
     

    Herczeg, G.J., Linsky, J.L., Walter, F.M., Gahm, G.F., & Johns-Krull, C.M. "The Origins of Fluorescent H2 Emission From T Tauri Stars." The Astrophysical Journal Supplement Series, 165 (2006, July) : 256-282.

     
     

    McCullough, P.R., Stys, J.E., Valenti, J.A., Johns-Krull, C.M., Janes, K.A., Heasley, J.N., Bye, B.A., Dodd, C., Fleming, S.W., Pinnick, A., Bissinger, R., Gary, B.L., Howell, P.J., & Vanmunster, T. "A Transiting Planet of a Sun-like Star." The Astrophysical Journal, 648 (2006, Spetember) : 1228-1238.

     
     

    Osten, R.A., Hawley, S.L., Allred, J., Johns-Krull, C.M., Brown, A., & Harper, G.M. "From Radio to X-Ray: The Quiescent Atmosphere of the dMe Flare Star EV Lacertae." The Astrophysical Journal, 647 (2006, August) : 1349-1374.

     
     

    Berger, E. et al. "The Magnetic Properties of an L Dwarf Derived from Simultaneous Radio, X-Ray, and Halpha Observations." The Astrophysical Journal, 627 (2005) : 960-973.

     
     

    Garcia-Alvarez, D., Johns-Krull, C.M., Doyle, J.G., Ugarte-Urra, I., Madjarska, M.S., and Butler, C. J. "Optical and EUV Observations of Solar Flare Kernels." Astronomy & Astrophysics, 444 (2005) : 593-603.

     
     

    Herczeg, G.J. et al. "The Loopy Ultraviolet Line Profiles of RU Lupi: Accretion, Outflows, and Fluorescence." The Astronomical Journal, 129 (2005) : 2777-2791.

     
     

    Johns-Krull, C. M., Valenti, J. A., and Saar, S. H. "Testing the Reality of Strong Magnetic Fields on T Tauri Stars: The Naked T Tauri Star Hubble 4." The Astrophysical Journal, 617 (2004) : 1204-1215.

     
     

    Osten, R. A., Hawley, S. L., Allred, J. C., Johns--Krull, C. M., and Roark, C. "From Radio to X-ray: Flares on the dMe Flare Star EV Lacertae." The Astrophysical Journal, 621 (2005) : 398-416.

     
     

    Yang, H., Johns-Krull, C.M., and Valenti, J.A. "Measuring the Magnetic Field of the Classical T Tauri Star TW Hydrae." The Astrophysical Journal, 635 (2005) : 635.

     
     Articles
     

    LSST Science Collaboration; including C. Johns-Krull "Science-Driven Optimization of the LSST Observing Strategy." eprint arXiv:1708.04058

     
     

    Johns-Krull, C.M. "Astrophysics: Secret ingredient exposed." Nature, 514 (2014) : 571.

     
     

    Johns–Krull, C.M. 2009, “Astrophysics: Magnetic bond” in, Nature, 457, 158

     
     

    Bercik, D. J., Fisher, G. H., Johns--Krull, C. M., and Abbett, W. P. "Turbulent Dynamos and the Minimum X-Ray Flux in Main Sequence Stars." The Astrophysical Journal, 631 (2005) : 529-539.

     
     Book chapters
     

    Bouvier, J., Alencar, S.H.P., Harries, T.J., Johns-Krull, C.M., & Romanova, M.M. "Magnetospheric Accretion in Classical T Tauri Stars." Protostars and Planets V (2007) : 479-494.

     
     Refereed conference papers
     

    Johns–Krull, C.M. & Cauley, P.W. "Observational Tests of Magnetospheric Accretion Models in Young Stars." European Physical Journal Web of Conferences, 64 (2014) : 8003.

     
     Conference papers
     

    Ling, Jason; Isella, Andrea; Johns-Krull, Christopher "Searching for Radio Emission from Young Stars and Exoplanets with the VLA Low-Frequency Sky Survey Redux." AASTCS5 Radio Exploration of Planetary Habitability, Proceedings of the conference 7-12 May, 2017 in Palm Springs, CA

     
     

    van Eyken, J. C., Ciardi, D. R., Barnes, J. W., Brown, T. M., Dragomir, D., Eastman, J., Beichman, C. A., Belle, G. v., Braun, K. v., Carey, S., Crockett, C., Fortney, J. J., Howell, S. B., Jackson, B. K., Johns–Krull, C., Kane, S. R., Lister, T., Mazin, B., McLane, J., Plavchan, P., Prato, L., Shporer, A., Stauffer, J. R. "PTFO 8-8695b: An Extremely Young T-Tauri-Transiting Planet." Search for Life Beyond the Solar System. Exoplanets, Biosignatures & Instruments (2014) : 57.

     
     

    Chen, Wei, Johns-Krull, Christopher "Spectropolarimetry of the classical T Tauri star BP Tauri." AIP Conference Proceedings, 1429 (2012) : 39.

     
     

    Hartigan, Patrick, Johns-Krull, Christopher M., Scowen, Paul "Inferring Rotation Periods of Young Stars from Synoptic Observations." Proceedings of the International Astronomical Union, IAU Symposium, 285 (2012) : 327.

     
     

    Johns-Krull, C. M., Valenti, J. A., Jeffers, S. V., Piskunov, N. E., Kochukhov, O., Keller, C., Snik, F., Rodenhuis, M., Makaganiuk, V., Stempels, H. "HARPS spectropolarimetry of classical T Tauri stars." AIP Conference Proceedings, 1429 (2012) : 43.

     
     
    Makaganiuk, V., Kochukhov, O., Piskunov, N., et al. 2011, "The search for magnetic fields in mercury-manganese stars," IAU Symposium, 272, 202
     
     
    Snik, F., Kochukhov, O., Piskunov, N., et al. 2011, "The HARPS Polarimeter," Solar Polarization 6, 437, 237 
     
     

    Chen, W., & Johns-Krull, C.M. 2011, "Magnetic Field Measurements of the Classical T Tauri Star BP Tauri," ASP Conf. Series, 448, 285

     
     

    Crockett, C.J., Mahmud, N, Prato, L., et.al. 2011, "Finding the Youngest Planets," ASP Conf. Series, 448, 53

     
     

    Kochukhov, O., Snik, F., Piskunov, N., et. al. 2011, "New Insights into Stellar Magnetism from the Spectropolarimetry in All Four Stokes Parameters," ASP Conf. Series, 448, 245

     
     
    Snik, F., et al. 2010, arXiv:1010.0397 

     
     

    Ardila, D.R. & Johns–Krull, C.M. 2009, “A Consistent Model of the Accretion Shock Region in Classical T Tauri Stars” in, 15th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, AIP Conf. Series, 1094, 309.

     
     

    Hamilton, C. M., Johns-Krull, C. M., Mundt, R., Herbst, W., & Winn, J. N. 2009, “Probing the size of a magnetosphere of a young solar-like star” in, Cosmic Magnetic Fields: From Planets, to Stars and Galaxies, IAUS, 259, 413.

     
     

    Hamilton, C.M., Cressotti, F.J., & Johns–Krull, C.M. 2009, “Rotation in NGC 2362: Examining the Role of Disk-Locking at 5 Myr” in, 15th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, AIP Conf. Series, 1094, 361.

     
     

    Johns–Krull, C.M. 2009, “Hot Inner Winds From T Tauri Stars” in, Protostellar Jets in Context, T. Ray, K. Tsinganos, and M. Stute (eds.), (Springer: Heidelberg), p. 33.

     
     

    Johns–Krull, C. M. 2009, “Measuring T Tauri Star Magnetic Fields” in, Cosmic Magnetic Fields: From Planets, to Stars and Galaxies, IAUS 259, 345.

     
     

    Johns–Krull, C.M. 2009, “Observations of Magnetic Fields on Late-Type Stars and Brown Dwarfs” in, 5th Solar Polarization Workshop, ASP Conf. Series, 405, 485.

     
     

    Yang, H. & Johns–Krull, C.M. 2009, “Magnetic Fields of the T Tauri Stars in the Orion Nebula Cluster” in, 15th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, AIP Conf. Series, 1094, 736.

     
     

    Johns-Krull, C.M. "Photospheric Magnetic Field Measurements on Late-Type Stars and Brown Dwarfs." ASP Conference Series, 384 (2008) : 145-154.

     
     

    Prato, L., Huerta, M., Johns-Krull, C.M., Hartigan, P., & Jaffe, D.T. "Surveying the Youngest Stars for the Youngest Substellar Companions." ASP Conference Series, 398 (2008) : 349.

     
     

    Snik, F., Jeffers, S., Keller, C., Piskunov, N., Kochukhov, O., Valenti, J., & Johns-Krull, C. "The upgrade of HARPS to a full-Stokes high-resolution spectropolarimeter." Proceedings of the SPIE, Volume 7014, 7014 (2008) : 70140O-70140O-10.

     
     

    Daou, A., Johns-Krull,C. M., and Valenti, J. A. "Spectropolarimetry of the Classical T Tauri Star T Tau." Proceedings of the 13th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, 560 (2005) : 499-502.

     
     

    Johns-Krull, C. M. and Anderson, J. A. "A New Parallax Measurement for the Pleiades Star Cluster." Proceedings of the 13th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, 560 (2005) : 683-687.

     
     

    Johns-Krull, C. M. and Valenti, J. A. "Magnetic Field Measurements for Cool Stars." Proceedings of the 13th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, 560 (2005) : 261-270.

     
     

    Yang, H., Johns-Krull, C. M., and Valenti, J. A. "Measuring the Magnetic Field on the Classical T Tauri Star TW Hydrae." Proceedings of the 13th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, 560 (2005) : 1043-1046.

     
     Other
     

    France, Kevin, Beasley, Matthew, Ardila, David R., Bergin, Edwin A., Brown, Alexander, Burgh, Eric B., Calvet, Nuria, Chiang, Eugene, Cook, Timothy A., Désert, Jean-Michel, Ebbets, Dennis, Froning, Cynthia S., Green, James C., Hillenbrand, Lynne A., Johns-Krull, Christopher M., Koskinen, Tommi T., Linsky, Jeffrey L., Redfield, Seth, Roberge, Aki, Schindhelm, Eric R., Scowen, Paul A., Stapelfeldt, Karl R., Tumlinson, Jason "From Protoplanetary Disks to Extrasolar Planets: Understanding the Life Cycle of Circumstellar Gas with Ultraviolet Spectroscopy."  (2012)

     
    Presentations
     Conference Committee Member
     

    I organized the entire conference..  "The 7th Texas Astronomy Undergraduate Research Symposium." Rice University, Houston, TX. (October 13, 2017)

     
     

    Co-Author and PhD Thesis Advisor.  "The Magnetic Fields on T Tauri Stars in the Orion Nebula Cluster." 15th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, St. Andrews, Scotland. (July 21-25, 2008) With H. Yang

     
     Invited Papers
     

    Co-Author.  "Star-Disk Interaction and Magnetospheric Accretion in Classical T Tauri Stars." Protostars and Planets V, Waikoloa Village, HI. (October 24-28, 2005) With J. Bouvier, S. Alencar, T. Harries, and M. Romanova

     
     Invited Talks
     

    Invited Speaker.  "Magnetically Controlled Accretion Onto Young Stars: Testing Current Models." Kavili Institute for Theoretical Physics - Disks, Dynamos, and Data: Confronting MHD Accretion Theory with Observations, Santa Barbara, CA. (February 6, 2017)

     
     

    Invited Speaker.  "Magnetism in Pre-Main Sequence Stars." 14th Potsdam Thinkshop - Stellar Magnetism: Challenges, Connections, and Prospects, Potsdam, Germany. (June 14, 2017)

     
     

    Invited Speaker.  "PTFO8-8695: A Young Planet Feeding Material into its Host Star's Magnetosphere." Rice University - Modeling the Magnetic Interactions Between Stars and Planets, Houston, TX. (May 15, 2017)

     
     

    Colloquium Speaker.  "Searching for Planets Around Young Stars." University of Western Ontario, Dept. of Physics and Astronomy, London, Ontario, Canada. (May 10, 2017)

     
     

    Invited Speaker.  ""Astronomy & Astrophysics at Rice University"." Building Astronomy in Texas, College Station, TX. (September 26, 2015)

     
     

    Invited Speaker.  ""Magnetic Fields on Young Stars and Their Role in Accretion and Disk Locking"." Star & Planet Formation in the Southwest, The Biosphere, AZ. (March 23, 2015)

     
     

    Colloquium Speaker.  ""Searching for Planets Around the Youngest Stars"." Space Telescope Science Institute, Baltimore, MD. (November 11, 2015)

     
     

    Speaker.  "Why Is It So Dry? Looking for the Origin of the Brown Dwarf Desert." University of Houston Clear Lake, Houston, TX. (January 30, 2014)

     
     

    Speaker.  "Observational Tests of Magnetospheric Accretion Models in Young Stars." Colloquium Speaker at Lowell Observatory, Flagstaff, Arizona. (May 8, 2013)

     
     

    Speaker.  "Observational Tests of Magnetospheric Accretion Models in Young Stars." Invited Speaker at Conference: Physics at the Magnetospheric Boundary, Geneva, Switzerland. (June 27, 2013)

     
     

    Speaker.  "Observational Tests of Magnetospheric Accretion Models in Young Stars." Colloquium Speaker at Stony Brook University, Stony Brook, New York. (April 24, 2013)

     
     

    Speaker.  "Why is it so Dry? Looking for the Origin of the Brown Dwarf Desert." Colloquium Speaker at Rochester Institute of Technology, Rochester, New York. (April 22, 2013)

     
     

    Speaker.  "Magnetism and Low Mass Companions of Young Stars." University of Colorado, Boulder, CO. (July 14, 2012)

     
     

    Speaker.  "Science Drivers for Future Ultraviolet Studies of Young Stellar Objects." UV Astronomy: HST and Beyond, Kauai, Hawaii. (June 21, 2012)

     
     

    Speaker.  "Magnetic Fields on Young Stars and Their Role in Accretion and Disk Locking." Transport Processes and Accretion in YSOs, Ringberg Castle, Germany. (February 7, 2011)

     
     

    Invited Speaker.  "Exploring the Planet Forming Environments of Young Suns." McDonald Observatory Board of Visitors 2010 July Meeting, McDonald Observatory, Fort Davis, TX. (July 17, 2010)

     
     

    Invited Speaker.  "Exploring the Planet Forming Environments of Young Suns." IGRINS Science Workshop, Seoul National University, Seoul, Korea. (August 26, 2010)

     
     

    Invited Speaker.  "Magnetospheric Accretion onto the Classical T Tauri Star BP Tauri." Magnetic Fields: From Core Collapse to YSOs, London, Ontario, Canada. (May 18, 2010)

     
     

    Invited Speaker.  "Photospheric Magnetic Field Measurements on Late-Type Stars and Brown Dwarfs." Cosmic Magnetism: From Stellar to Intergalactic Scales, Kiama, Australia. (June 7, 2010)

     
     

    Invited Speaker.  "Properties of Young Stars and Their Disks and Implications for Exoplanets." University of Central Florida Winter Workshop, Orlando Florida. (January 7, 2010)

     
     

    "Looking for Planets in the First 3 MillionYears." (March 5, 2009)

     
     

    "Measuring Magnetic Fields on Young Stars." (August 4, 2009)

     
     

    "Searching for Brown Dwarfs and Giant Planets in the First 3 Million Years." (September 16, 2009)

     
     

    Invited speaker.  "Hot Inner Winds from T Tauri Stars." Protostellar Jets in Context, Rhodes, Greece. (July 7, 2008)

     
     

    Invited speaker.  "Measuring T Tauri Stars Magnetic Fields." IAUS 259: Cosmic Magnetic Fields, Tenerife, Spain. (November 5, 2008)

     
     

    Invited speaker.  "Magnetic Fields on Late-Type Stars and Brown Dwarfs." 5th Solar Polarization Workshop, Ascona, Switzerland. (September 21, 2007)

     
     

    Invited speaker.  "Measurements of Magnetic Fields on Young Stars." IAU Symposium 243: Star-Disk Interaction in Young Stars, Grenoble, France. (May 21, 2007)

     
     Johns-Krull, C.M. 2006, 14th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, G. van Belle (ed.), ASP Conf. Series, in press
     
     

    Speaker.  "Critical Tests of Magnetospheric Accretion Theory." From Disks to Planets: New Observations, Models, and Theories, Pasadena, CA. (March 7-10, 2005)

     
     

    Colloquium Speaker.  "The Magnetic Fields of Young Stars and Turbulent Dynamos." High Altitude Observatory, Boulder, CO. (February 9, 2005)

     
     Keynote Speaker
     

    "Wandering in the Brown Dwarf Desert." (April 18, 2009)

     
     

    Invited speaker.  "New Puzzles on the Formation of Giant Planets." North Houston Astronomy Club, Kingwood, TX. (February 22, 2008)

     
     

    Invited Speaker at HCC Astronomy Education Event.  "Current Issues in Low Mass Star Formation." Houston Community College, Houston, TX. (March 4, 2006)

     
     

    Invited Speaker.  "Current Issues in Low Mass Star Formation." North Houston Astronomy Club, Kingwood, TX. (January 27, 2006)

     
     Lectures
     

    Speaker.  "Stars, Planets, & Life." Outreach Speaker at River Oaks Elementary School, Houston, Texas. (January 29, 2013)

     
     

    Co-author on presentation.  "Giant Planet Companions to T Tauri Stars." 219th Meeting of the American Astronomical Society, Austin, TX. (January 10, 2012) With Crockett, Christopher, Mahmud, N., Prato, L., Jaffe, D. T., Hartigan, P., Beichman, C. A.

     
     

    Speaker.  "Magnetic Fields on Young Stars and Their Role in Accretion and Disk Locking." Astronomy Dept. UT Austin, Austin, TX. (January 28, 2011)

     
     Posters
     

    Lead author and poster presenter.  ""Hα Variability in PTFO8-8695 and the Possible Direct Detection of Emission from a 2 Myr Old Evaporating Hot Jupiter"." Gordon Research Conference on Origins of Solar Systems, Mt. Holyoke College. (June 28 - July 3, 2015)

     
     

    Presenter.  "HARPS Spectropolarimetry of the Classical T Tauri Stars GQ Lup and TW Hya." Poster at 221st Meeting of the American Astronomical Society, Long Beach, California. (January 8, 2013) With Chen, W., Valenti, J. A., Jeffers, S. V., Piskunov, N. E., Kochukhov, O., Makaganiuk, V., Stempels, H. C., Snik, F., Keller, C., & Rodenhuis, M.

     
     

    Lead presenter.  "Hst Parallax Of XO-3 And Implications For The Structure Of Its Hot Jupiter." 219th Meeting of the American Astronomical Society, Austin, TX. (January 10, 2012) With Benedict, G. F., Mahmud, N., McArthur, B., McCullough, P., Valenti, J. A.

     
     

    "HARPS Spectropolarimetry of Young Stars." (June 27-29, 2011)

     
     

    Co-Author.  "Rotation in NGC 2362: Examining the Role of Disk- Locking at 5 Myr." 15th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, St. Andrews, Scotland. (July 21-25, 2008) With C. M. Hamilton-Drager

     
     Huerta, M., Prato, L., Hartigan, P., Johns-Krull, C.M., & Jaffe, D. 2005, Bulletin of the American Astronomical Society, Vol. 37, p.1267
     
     Lockhart, K.E., Johns-Krull, C.M., & Hamilton, C.M. 2005, Bulletin of the American Astronomical Society, Vol. 37, p.1285
     
     Johns-Krull, C.M. & Valenti, J.A. 2005, Bulletin of the American Astronomical Society, Vol. 37, p.1284
     
     Yang, H. Johns-Krull, C.M., & Valenti, J.A. 2006, 14th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, G. van Belle (ed.), ASP Conf. Series, in press
     
     Hamilton, C.M., Bushong, K., & Johns-Krull, C.M. 2006, 14th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, G. van Belle (ed.), ASP Conf. Series, in press
     
     Johns-Krull, C.M., Greene, T., Doppmann, G., & Covey, K. 2006, 14th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, G. van Belle (ed.), ASP Conf. Series, in press
     
     Ramkumar, B. & Johns-Krull, C.M. 2005, Bulletin of the American Astronomical Society, Vol. 37, p.1285
     
     Hawks, E.L., Johns-Krull, C.M., & Hamilton, C.M. 2005, Bulletin of the American Astronomical Society, Vol. 37, p.1284
     
     

    Lead author.  "Magnetic Field Measurements on T Tauri Stars: Testing Magnetospheric Accretion Theory." Protostars and Planets V, Waikoloa Village, HI. (October 24-28, 2005) With J. valenti

     
     

    Co-author.  "Resolving an Accretion Flow: H-alpha Line Profiles of KH 15D." Protostars and Planets V, Waikoloa Village, HI. (October 24-28, 2005) With C. Hamilton, W. Herbst, J. Winn, R. Mundt, C. Bailer-Jones

     
     

    Directed research of H. Yang.  "The Magnetic Field of TW Hydrae." Protostars and Planets V, Waikoloa Village, HI. (October 24-28, 2005) With H. Yang and J. Valenti

     
     Seminar Speaker
     

    Seminar Speaker.  ""Observations(?) of Star-Planet Interactions"." Rice University, Houston, TX. (September 23, 2015)

     
     

    Seminar Speaker.  ""PTFO8-8695: A 2 Myr Old Evaporating Hot Jupiter?"." Rice University, Houston, TX. (January 21, 2015)

     
     

    Speaker.  "A New Parallax Measurement fo the Pleiades Open Cluster." Astronomy Seminar Speaker at Rice University, Houston, Texas. (September 11, 2013)

     
     

    Speaker.  "Why is it so Dry? Looking for the Origin of the Brown Dwarf Desert." Astronomy Seminar Speaker at Rice University, Houston, Texas. (February 6, 2013)

     
     

    Speaker.  "TORRE, NSF Portfolio Review, and the Future of UV Astronomy." Rice University, Houston, TX. (August 29, 2012)

     
     

    Speaker.  "HARPS Spectropolarimetry of Classical T Tauri Stars." Rice University, Houston, TX. (September 7, 2011)

     
     

    "Searching for Brown Dwarfs and Giant Planets in the First 3 Million Years." (April 20, 2009)

     
     

    colloquium speaker.  "The Magnetic Fields of T Tauri Stars." Max-Planck-Institut f|r Astronomie, Heidelberg, Germany. (June 28, 2006)

     
     

    Speaker.  "Probing the Electron Distribution Function in Solar Flares Through Hard X-ray Bremsstrahlung Spectral Inversion." Space Sciences Laboratory, UC Berkeley, Berkeley, CA. (May 31, 2005)

     
    Editorial Positions
     Editor, Proceedings of the 16th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun. Astronomical Society of the Pacific. (2011 - 2011)

     Editor, Proceedings of the 16th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun. Astronomical Society of the Pacific. (2010 - 2010)

    Supervised Theses & Dissertations
     Jianhang Zhou, Masters Construction of a New Detector, and Clibration Strategies, for Start Timing in the STAR Experiment at RHIC. (2006) (Thesis Committee Member)

     Seiji Yamamoto, Masters Fermi surface and antiferromagnetism in the Kondo lattice: an asymptotically exact solution in d>1 Dimensions. (2006) (Thesis Committee Member)

     Chris Wells, Masters Master's Thesis. (2007) (Thesis Committee Member)

     Yang Song, Masters On the Relationship Between Kinetic and Fluid Formalisms for Convection in the Inner Magnetosphere. (2007) (Thesis Committee Member)

     Jacob Bean, PhD M Dwarf Metallicities and Exoplanets. (2007) (Thesis Committee Member)

     Lucianne Walkowicz, Ph.D. Self-Consistent Quiescent Model Atmospheres for M Dwarfs. (2008) (Thesis Committee Member)

     Naved Mahmud, Masters Using Resolved Galaxies in Hubble Space Telescope Images to Measure Absolute Proper Motions. (2008) (Thesis Director)

     Hao Yang, Ph.D. The Magnetic Fields of Young Stars. (2008) (Thesis Director)

     Casey Patrick Deen, PhD An Investigation of the Physical Parameters of Young Stellar Objects. (2011) (Thesis Committee Member)

     Wei Chen, Masters Spectropolarimetry of the Classical T Tauri Star BP Tauri. (2011) (Thesis Director)

     Paul Wilson Cauli, Masters Testing Magnetospheric Accretion Theories in NGC 2264. (2012) (Thesis Director)

     Naved Imran Mahmud, PhD A Radial Velocity Survey for Substellar Companions of T Tauri Stars. (2012) (Thesis Director)

     Ke-Feng Xin, Masters Properties of Dihadron Correlations for p+p Collisions at sqrt(S_NN)=200 GeV. (2012) (Thesis Committee Member)

     Tzu-Lin Sun, MS Why hydrocarbon-cross-linked peptides are membrane permeable. (2012) (Thesis Committee Member)

     Michael W Eastwood, BS Characterizing T Tauri Star Variability with Simultaneous Photometric and Spetroscopic Observations. (2012) (Thesis Director)

     Kathryn Powell, BS Dynamical Stability of Kepler's Multi-Planet Systems. (2013) (Thesis Director)

     Steven M. Silverberg, BS Rotational Velocity Measurements and Magnetic Field Modeling on M-dwarf Stars. (2013) (Thesis Director)

     Steven Silverberg, BS Magnetic Field Variability of dMe Stars. (2013) (Thesis Director)

     Naved I Mahmud, PhD The Origin of the Brown Dwarf Desert. (2014) (Thesis Director)

     Paul Wilson Cauley, Ph.D. Diagnosing Mass Flows in Herbig Ae/Be Stars. (2014) (Thesis Director)

     Wei Chen, PhD The Magnetic Field Geometry of Young Stars. (2014) (Thesis Director)

     Katya S Arquilla, BS Halpha Variability of the Young Star CI Tau. (2014) (Thesis Director)

     Paul Wilson Cauley, PhD A Critical Evaluation of the Role of Magnetospheric Accretion and Disk Locking in Intermediate Mass Protostars. (2015) (Thesis Director)

     Landon Blair, BS The X-ray Emission of Young Stars. (2015) (Thesis Director)

     Matthew B Weller, PhD On the Evolution of Planets: From Convective Bi-stability to Volcanic Edifice Instability. (2015) (Thesis Committee Member)

     Andy S Liao, MS Numerical Simulation of an Experimental Analogue of a Planetary Magnetosphere. (2015) (Thesis Committee Member)

     Wei Chen, Ph.D. Magnetic Fields and Accretion on T Tauri Stars. (2015) (Thesis Director)

    Awards, Prizes, & Fellowships
     Distinguished Faculty Associate, Brown College (March 29, 2017)

     Outstanding Faculty Associate, Brown College (March 24, 2016)

     Brown College Distinguished Faculty Associate, Brown College, Rice University (March 20, 2014)

     Brown College Distinguished Faculty Associate, Brown College, Rice University (March 20, 2014)

     Distinguished Faculty Associate, Brown College, Rice University (March 22, 2013)

     Distinguished Faculty Associate, Brown College (April 7, 2010)