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Title: HAT-P-31b,c: A TRANSITING, ECCENTRIC, HOT JUPITER AND A LONG-PERIOD, MASSIVE THIRD BODY

Abstract

We report the discovery of HAT-P-31b, a transiting exoplanet orbiting the V = 11.660 dwarf star GSC 2099-00908. HAT-P-31b is the first planet discovered with the Hungarian-made Automated Telescope (HAT) without any follow-up photometry, demonstrating the feasibility of a new mode of operation for the HATNet project. The 2.17 M{sub J} , 1.1 R{sub J} planet has a period of P{sub b} = 5.0054 days and maintains an unusually high eccentricity of e{sub b} = 0.2450 {+-} 0.0045, determined through Keck, FIbr-fed Echelle Spectrograph, and Subaru high-precision radial velocities (RVs). Detailed modeling of the RVs indicates an additional quadratic residual trend in the data detected to very high confidence. We interpret this trend as a long-period outer companion, HAT-P-31c, of minimum mass 3.4 M{sub J} and period {>=}2.8 years. Since current RVs span less than half an orbital period, we are unable to determine the properties of HAT-P-31c to high confidence. However, dynamical simulations of two possible configurations show that orbital stability is to be expected. Further, if HAT-P-31c has non-zero eccentricity, our simulations show that the eccentricity of HAT-P-31b is actively driven by the presence of c, making HAT-P-31 a potentially intriguing dynamical laboratory.

Authors:
; ; ; ; ; ; ; ; ;  [1]; ;  [2];  [3];  [4]; ;  [5]; ;  [6];  [7];  [8]
  1. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States)
  2. Research School of Astronomy and Astrophysics, The Australian National University, Weston Creek, ACT (Australia)
  3. Department of Earth and Planetary Sciences, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8551 (Japan)
  4. Konkoly Observatory, Budapest (Hungary)
  5. Niels Bohr Institute, Copenhagen University, Copenhagen (Denmark)
  6. Department of Astronomy, University of California, Berkeley, CA (United States)
  7. Department of Astronomy, Yale University, New Haven, CT (United States)
  8. Department of Astrophysics, California Institute of Technology, Pasadena, CA (United States)
Publication Date:
OSTI Identifier:
21582882
Resource Type:
Journal Article
Journal Name:
Astronomical Journal (New York, N.Y. Online)
Additional Journal Information:
Journal Volume: 142; Journal Issue: 3; Other Information: DOI: 10.1088/0004-6256/142/3/95; Journal ID: ISSN 1538-3881
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; DWARF STARS; JUPITER PLANET; PHOTOMETRY; RADIAL VELOCITY; SIMULATION; TELESCOPES; PLANETS; STARS; VELOCITY

Citation Formats

Kipping, D. M., Hartman, J., Bakos, G. A., Torres, G., Latham, D. W., Beky, B., Quinn, S. N., Noyes, R. W., Sasselov, D. D., Stefanik, R. P., Bayliss, D., Kiss, L. L., Sato, B., Kovacs, Geza, Buchhave, L. A., Andersen, J., Marcy, G. W., Howard, A. W., Fischer, D. A., and Johnson, J. A., E-mail: dkipping@cfa.harvard.edu. HAT-P-31b,c: A TRANSITING, ECCENTRIC, HOT JUPITER AND A LONG-PERIOD, MASSIVE THIRD BODY. United States: N. p., 2011. Web. doi:10.1088/0004-6256/142/3/95.
Kipping, D. M., Hartman, J., Bakos, G. A., Torres, G., Latham, D. W., Beky, B., Quinn, S. N., Noyes, R. W., Sasselov, D. D., Stefanik, R. P., Bayliss, D., Kiss, L. L., Sato, B., Kovacs, Geza, Buchhave, L. A., Andersen, J., Marcy, G. W., Howard, A. W., Fischer, D. A., & Johnson, J. A., E-mail: dkipping@cfa.harvard.edu. HAT-P-31b,c: A TRANSITING, ECCENTRIC, HOT JUPITER AND A LONG-PERIOD, MASSIVE THIRD BODY. United States. doi:10.1088/0004-6256/142/3/95.
Kipping, D. M., Hartman, J., Bakos, G. A., Torres, G., Latham, D. W., Beky, B., Quinn, S. N., Noyes, R. W., Sasselov, D. D., Stefanik, R. P., Bayliss, D., Kiss, L. L., Sato, B., Kovacs, Geza, Buchhave, L. A., Andersen, J., Marcy, G. W., Howard, A. W., Fischer, D. A., and Johnson, J. A., E-mail: dkipping@cfa.harvard.edu. Thu . "HAT-P-31b,c: A TRANSITING, ECCENTRIC, HOT JUPITER AND A LONG-PERIOD, MASSIVE THIRD BODY". United States. doi:10.1088/0004-6256/142/3/95.
@article{osti_21582882,
title = {HAT-P-31b,c: A TRANSITING, ECCENTRIC, HOT JUPITER AND A LONG-PERIOD, MASSIVE THIRD BODY},
author = {Kipping, D. M. and Hartman, J. and Bakos, G. A. and Torres, G. and Latham, D. W. and Beky, B. and Quinn, S. N. and Noyes, R. W. and Sasselov, D. D. and Stefanik, R. P. and Bayliss, D. and Kiss, L. L. and Sato, B. and Kovacs, Geza and Buchhave, L. A. and Andersen, J. and Marcy, G. W. and Howard, A. W. and Fischer, D. A. and Johnson, J. A., E-mail: dkipping@cfa.harvard.edu},
abstractNote = {We report the discovery of HAT-P-31b, a transiting exoplanet orbiting the V = 11.660 dwarf star GSC 2099-00908. HAT-P-31b is the first planet discovered with the Hungarian-made Automated Telescope (HAT) without any follow-up photometry, demonstrating the feasibility of a new mode of operation for the HATNet project. The 2.17 M{sub J} , 1.1 R{sub J} planet has a period of P{sub b} = 5.0054 days and maintains an unusually high eccentricity of e{sub b} = 0.2450 {+-} 0.0045, determined through Keck, FIbr-fed Echelle Spectrograph, and Subaru high-precision radial velocities (RVs). Detailed modeling of the RVs indicates an additional quadratic residual trend in the data detected to very high confidence. We interpret this trend as a long-period outer companion, HAT-P-31c, of minimum mass 3.4 M{sub J} and period {>=}2.8 years. Since current RVs span less than half an orbital period, we are unable to determine the properties of HAT-P-31c to high confidence. However, dynamical simulations of two possible configurations show that orbital stability is to be expected. Further, if HAT-P-31c has non-zero eccentricity, our simulations show that the eccentricity of HAT-P-31b is actively driven by the presence of c, making HAT-P-31 a potentially intriguing dynamical laboratory.},
doi = {10.1088/0004-6256/142/3/95},
journal = {Astronomical Journal (New York, N.Y. Online)},
issn = {1538-3881},
number = 3,
volume = 142,
place = {United States},
year = {2011},
month = {9}
}