Dr. Ravi Kumar Kopparapu

Dr. Ravi Kumar Kopparapu

  • Research AST, Planetary Studies
  • 301.286.1548
  • NASA/GSFC
  • Mail Code: 699
  • Greenbelt , MD 20771
  • Employer: NASA
  • Brief Bio

    My research interests are in extrasolar planet habitability, atmosphere modeling and characterization. Specifically, I use 1-dimensional and 3-dimensional climate and photochemical models to determine the conditions needed for a terrestrial planet to sustain liquid water on it's surface. Life, as we know it, requires liquid water; therefore, finding worlds around other stars and identifying the signatures of surface water can potentially allow us to discover extraterrestrial life. I am also interested super-Earth and mini-Neptune atmospheres, and their characterization. There are no such planets in our solar system, so they provide an excellent opportunity to study planets that are totally new to us.

    I am also interested in identifying technosignatures. Just as biosignatures are signs of biology, technosignatures are a signs of technology. This field is in it's nascent stage (just like biosignatures was several decades ago), so its a good time to get involved.


    EDUCATION

    Louisiana State University (LSU), Baton Rouge, LA

    Ph.D. in Physics, December 2006

    M.S. (Physics), LSU, May 2003

    M.Sc.(Physics), University of Pune, India, June 1998

    B.Sc. (Electronics), Nagarjuna University, India, June 1996

    PROFESSIONAL EXPERIENCE

    2015 – Present: Research Scientist, NASA Goddard Space Flight Center

    9/2013 – 08/2015: Research Associate, Planetary Science, Pennsylvania State University (Penn State)

    9/2010 – 8/2013: Postdoctoral Scholar, NASA Astrobiology Institute’s Virtual Planetary Lab, Penn State 9/2007 – 8/2010: Posdoctoral Scholar, Center for Gravitational-Wave Astronomy, Penn State

    1/2007 – 7/2007: Postdoctoral Scholar, Center for Computation and Technology, LSU

    RESEARCH INTERESTS

    Extrasolar planets: habitability, atmospheric modeling and characterization, planetary transit analysis.

    KEY SCIENCE RESULTS

    • Determined habitable zone (HZ) estimates for different stars using climate models

    • All the currently known exoplanets discovered in the HZs around other stars, to-date, have used the HZ estimates from my work

    • HZ results used as one of the standards for defining habitable planets for NASA concept missions: LUVOIR, HabEX

     

    Publications

    Refereed

    Guzewich, S. D., J. Lustig-Yaeger, C. E. Davis, et al. R. K. Kopparapu, M. J. Way, and V. S. Meadows. 2020. "The Impact of Planetary Rotation Rate on the Reflectance and Thermal Emission Spectrum of Terrestrial Exoplanets around Sunlike Stars." The Astrophysical Journal, 893 (2): 140 [10.3847/1538-4357/ab83ec]

    Suissa, G., A. M. Mandell, E. T. Wolf, et al. G. L. Villanueva, T. Fauchez, and R. K. Kopparapu. 2020. "Dim Prospects for Transmission Spectra of Ocean Earths around M Stars." The Astrophysical Journal, 891 (1): 58 [10.3847/1538-4357/ab72f9]

    Suissa, G., E. T. Wolf, R. K. Kopparapu, et al. G. L. Villanueva, T. Fauchez, A. M. Mandell, G. Arney, E. A. Gilbert, J. E. Schlieder, T. Barclay, E. V. Quintana, E. Lopez, J. E. Rodriguez, and A. Vanderburg. 2020. "The First Habitable Zone Earth-sized Planet from TESS. III: Climate States and Characterization Prospects for TOI-700 d." The Astronomical Journal, arXiv:2001.00955. (Submitted)

    Kopparapu, R. K., E. Hébrard, R. Belikov, et al. N. M. Batalha, G. D. Mulders, C. Stark, D. Teal, S. Domagal-Goldman, and A. Mandell. 2018. "Exoplanet Classification and Yield Estimates for Direct Imaging Missions." The Astrophysical Journal, 856 (2): 122 [10.3847/1538-4357/aab205]

    Haqq-Misra, J., E. T. Wolf, M. Joshi, X. Zhang, and R. K. Kopparapu. 2018. "Demarcating Circulation Regimes of Synchronously Rotating Terrestrial Planets within the Habitable Zone." The Astrophysical Journal, 852 (2): 67 [10.3847/1538-4357/aa9f1f]

    Fauchez, T., G. N. Arney, R. Kopparapu, and S. D. Domagal-Goldman. 2018. "Explicit cloud representation in the Atmos 1D climate model for Earth and rocky planet applications." AIMS Geosciences, 4 (4): 180-191 [10.3934/geosci.2018.4.180]

    Kopparapu, R. K., E. T. Wolf, G. Arney, et al. N. E. Batalha, J. Haqq-Misra, S. L. Grimm, and K. Heng. 2017. "Habitable Moist Atmospheres on Terrestrial Planets near the Inner Edge of the Habitable Zone around M Dwarfs." The Astrophysical Journal, 845 (1): 5 [10.3847/1538-4357/aa7cf9]

    Haqq-Misra, J., R. K. Kopparapu, and E. T. Wolf. 2017. "Why do we find ourselves around a yellow star instead of a red star?" International Journal of Astrobiology, 17 (01): 77-86 [10.1017/s1473550417000118]

    Wolf, E. T., A. L. Shields, R. K. Kopparapu, J. Haqq-Misra, and O. B. Toon. 2017. "Constraints on Climate and Habitability for Earth-like Exoplanets Determined from a General Circulation Model." The Astrophysical Journal, 837 (2): 107 [10.3847/1538-4357/aa5ffc]

    Kopparapu, R. 2016. "A CATALOG OFKEPLERHABITABLE ZONE EXOPLANET CANDIDATES." The Astrophysical Journal, 830 (1): 1 [10.3847/0004-637x/830/1/1]

    Kopparapu, R. 2013. "A Revised Estimate of the Occurrence Rate of Terrestrial Planets in the Habitable Zones around Kepler M-dwarfs." The Astrophysical Journal, 767 (1): 5.

    Kopparapu, R. K., R. Ramirez, J. F. Kasting, et al. V. Eymet, T. D. Robinson, S. Mahadevan, R. C. Terrien, S. Domagal-Goldman, V. Meadows, and R. Deshpande. 2013. "Erratum: Habitable Zones Around Main-sequence Stars: New Estimates’' (2013, ApJ, 765, 131)." The Astrophysical Journal, 770: 82 [doi:10.1088/0004-637X/770/1/82]

    Kopparapu, R. 2012. "A Photochemical Model for the Carbon-rich Planet WASP-12b." The Astrophysical Journal, 745 (1): 10.

    Non-Refereed

    Apai, D., N. Cowan, R. Kopparapu, et al. M. Kasper, R. Hu, C. Morley, Y. Fujii, S. Kane, M. Maley, A. del Genio, T. Karalidi, T. Komacek, E. Mamajek, A. Mandell, S. Domagal-Goldman, T. Barman, A. Boss, J. Breckinridge, I. Crossfield, W. Danchi, E. Ford, N. Iro, J. Kasting, P. Lowrance, N. Madhusudhan, M. McElwain, W. Moore, I. Pascucci, P. Plavchan, A. Roberge, G. Schneider, A. Showman, and M. Turnbull. 2017. "Exploring Other Worlds: Science Questions for Future Direct Imaging Missions (EXOPAG SAG15 Report)." eprint arXiv:1708.02821 --.

    Brief Bio

    My research interests are in extrasolar planet habitability, atmosphere modeling and characterization. Specifically, I use 1-dimensional and 3-dimensional climate and photochemical models to determine the conditions needed for a terrestrial planet to sustain liquid water on it's surface. Life, as we know it, requires liquid water; therefore, finding worlds around other stars and identifying the signatures of surface water can potentially allow us to discover extraterrestrial life. I am also interested super-Earth and mini-Neptune atmospheres, and their characterization. There are no such planets in our solar system, so they provide an excellent opportunity to study planets that are totally new to us.

    I am also interested in identifying technosignatures. Just as biosignatures are signs of biology, technosignatures are a signs of technology. This field is in it's nascent stage (just like biosignatures was several decades ago), so its a good time to get involved.


    EDUCATION

    Louisiana State University (LSU), Baton Rouge, LA

    Ph.D. in Physics, December 2006

    M.S. (Physics), LSU, May 2003

    M.Sc.(Physics), University of Pune, India, June 1998

    B.Sc. (Electronics), Nagarjuna University, India, June 1996

    PROFESSIONAL EXPERIENCE

    2015 – Present: Research Scientist, NASA Goddard Space Flight Center

    9/2013 – 08/2015: Research Associate, Planetary Science, Pennsylvania State University (Penn State)

    9/2010 – 8/2013: Postdoctoral Scholar, NASA Astrobiology Institute’s Virtual Planetary Lab, Penn State 9/2007 – 8/2010: Posdoctoral Scholar, Center for Gravitational-Wave Astronomy, Penn State

    1/2007 – 7/2007: Postdoctoral Scholar, Center for Computation and Technology, LSU

    RESEARCH INTERESTS

    Extrasolar planets: habitability, atmospheric modeling and characterization, planetary transit analysis.

    KEY SCIENCE RESULTS

    • Determined habitable zone (HZ) estimates for different stars using climate models

    • All the currently known exoplanets discovered in the HZs around other stars, to-date, have used the HZ estimates from my work

    • HZ results used as one of the standards for defining habitable planets for NASA concept missions: LUVOIR, HabEX

     

    Publications

    Refereed

    Guzewich, S. D., J. Lustig-Yaeger, C. E. Davis, et al. R. K. Kopparapu, M. J. Way, and V. S. Meadows. 2020. "The Impact of Planetary Rotation Rate on the Reflectance and Thermal Emission Spectrum of Terrestrial Exoplanets around Sunlike Stars." The Astrophysical Journal 893 (2): 140 [10.3847/1538-4357/ab83ec]

    Suissa, G., A. M. Mandell, E. T. Wolf, et al. G. L. Villanueva, T. Fauchez, and R. K. Kopparapu. 2020. "Dim Prospects for Transmission Spectra of Ocean Earths around M Stars." The Astrophysical Journal 891 (1): 58 [10.3847/1538-4357/ab72f9]

    Suissa, G., E. T. Wolf, R. K. Kopparapu, et al. G. L. Villanueva, T. Fauchez, A. M. Mandell, G. Arney, E. A. Gilbert, J. E. Schlieder, T. Barclay, E. V. Quintana, E. Lopez, J. E. Rodriguez, and A. Vanderburg. 2020. "The First Habitable Zone Earth-sized Planet from TESS. III: Climate States and Characterization Prospects for TOI-700 d." The Astronomical Journal (Submitted) arXiv:2001.00955

    Kopparapu, R. K., E. Hébrard, R. Belikov, et al. N. M. Batalha, G. D. Mulders, C. Stark, D. Teal, S. Domagal-Goldman, and A. Mandell. 2018. "Exoplanet Classification and Yield Estimates for Direct Imaging Missions." The Astrophysical Journal 856 (2): 122 [10.3847/1538-4357/aab205]

    Haqq-Misra, J., E. T. Wolf, M. Joshi, X. Zhang, and R. K. Kopparapu. 2018. "Demarcating Circulation Regimes of Synchronously Rotating Terrestrial Planets within the Habitable Zone." The Astrophysical Journal 852 (2): 67 [10.3847/1538-4357/aa9f1f]

    Fauchez, T., G. N. Arney, R. Kopparapu, and S. D. Domagal-Goldman. 2018. "Explicit cloud representation in the Atmos 1D climate model for Earth and rocky planet applications." AIMS Geosciences 4 (4): 180-191 [10.3934/geosci.2018.4.180]

    Kopparapu, R. K., E. T. Wolf, G. Arney, et al. N. E. Batalha, J. Haqq-Misra, S. L. Grimm, and K. Heng. 2017. "Habitable Moist Atmospheres on Terrestrial Planets near the Inner Edge of the Habitable Zone around M Dwarfs." The Astrophysical Journal 845 (1): 5 [10.3847/1538-4357/aa7cf9]

    Haqq-Misra, J., R. K. Kopparapu, and E. T. Wolf. 2017. "Why do we find ourselves around a yellow star instead of a red star?" International Journal of Astrobiology 17 (01): 77-86 [10.1017/s1473550417000118]

    Wolf, E. T., A. L. Shields, R. K. Kopparapu, J. Haqq-Misra, and O. B. Toon. 2017. "Constraints on Climate and Habitability for Earth-like Exoplanets Determined from a General Circulation Model." The Astrophysical Journal 837 (2): 107 [10.3847/1538-4357/aa5ffc]

    Kopparapu, R. 2016. "A CATALOG OFKEPLERHABITABLE ZONE EXOPLANET CANDIDATES." The Astrophysical Journal 830 (1): 1 [10.3847/0004-637x/830/1/1]

    Kopparapu, R. 2013. "A Revised Estimate of the Occurrence Rate of Terrestrial Planets in the Habitable Zones around Kepler M-dwarfs." The Astrophysical Journal 767 (1): 5

    Kopparapu, R. K., R. Ramirez, J. F. Kasting, et al. V. Eymet, T. D. Robinson, S. Mahadevan, R. C. Terrien, S. Domagal-Goldman, V. Meadows, and R. Deshpande. 2013. "Erratum: Habitable Zones Around Main-sequence Stars: New Estimates’' (2013, ApJ, 765, 131)." The Astrophysical Journal 770 82 [doi:10.1088/0004-637X/770/1/82]

    Kopparapu, R. 2012. "A Photochemical Model for the Carbon-rich Planet WASP-12b." The Astrophysical Journal 745 (1): 10

    Non-Refereed

    Apai, D., N. Cowan, R. Kopparapu, et al. M. Kasper, R. Hu, C. Morley, Y. Fujii, S. Kane, M. Maley, A. del Genio, T. Karalidi, T. Komacek, E. Mamajek, A. Mandell, S. Domagal-Goldman, T. Barman, A. Boss, J. Breckinridge, I. Crossfield, W. Danchi, E. Ford, N. Iro, J. Kasting, P. Lowrance, N. Madhusudhan, M. McElwain, W. Moore, I. Pascucci, P. Plavchan, A. Roberge, G. Schneider, A. Showman, and M. Turnbull. 2017. "Exploring Other Worlds: Science Questions for Future Direct Imaging Missions (EXOPAG SAG15 Report)." eprint arXiv:1708.02821 --

                                                                                                                                                                                            
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