Evidence for reflected light from the most eccentric exoplanet known
Article
Article Title | Evidence for reflected light from the most eccentric exoplanet known |
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ERA Journal ID | 1057 |
Article Category | Article |
Authors | Kane, Stephen R. (Author), Wittenmyer, Robert A. (Author), Hinkel, Natalie R. (Author), Roy, Arpita (Author), Mahadevan, Suvrath (Author), Dragomir, Diana (Author), Matthews, Jaymie M. (Author), Henry, Gregory W. (Author), Chakraborty, Abhijit (Author), Boyajian, Tabetha S. (Author), Wright, Jason T. (Author), Ciardi, David R. (Author), Fischer, Debra A. (Author), Butler, R. Paul (Author), Tinney, C. G. (Author), Carter, Brad D. (Author), Jones, Hugh R. A . (Author), Bailey, Jeremy (Author) and O'Toole, Simon J. (Author) |
Journal Title | The Astrophysical Journal: an international review of astronomy and astronomical physics |
Journal Citation | 821 (1) |
Article Number | 65 |
Number of Pages | 12 |
Year | 2016 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-637X |
1538-4357 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/0004-637X/821/1/65 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/0004-637X/821/1/65 |
Abstract | Planets in highly eccentric orbits form a class of objects not seen within our Solar System. The most extreme case known amongst these objects is the planet orbiting HD 20782, with an orbital period of 597 days and an eccentricity of 0.96. Here we present new data and analysis for this system as part of the Transit Ephemeris Refinement and Monitoring Survey (TERMS). We obtained CHIRON spectra to perform an independent estimation of the fundamental stellar parameters. New radial velocities from AAT and PARAS observations during periastron passage greatly improve the our knowledge of the eccentric nature of the orbit. The combined analysis of our Keplerian orbital and Hipparcos astrometry show that the inclination of the planetary orbit is > 1.25 degrees, ruling out stellar masses for the companion. Our long-term robotic photometry show that the star is extremely stable over long timescales. Photometric monitoring of the star during predicted transit and periastron times using MOST rule out a transit of the planet and reveal evidence of phase variations during periastron. These possible photometric phase variations are likely caused by reflected light from the planet's atmosphere and the dramatic change in star--planet separation surrounding the periastron passage. |
Keywords | planetary systems – techniques, photometric – techniques, radial velocities – stars, individual (HD 20782) |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Byline Affiliations | San Francisco State University, United States |
University of New South Wales | |
Pennsylvania State University, United States | |
Las Cumbres Observatory, United States | |
University of British Columbia, Canada | |
Tennessee State University, United States | |
Department of Space, India | |
Yale University, United States | |
National Aeronautics and Space Administration (NASA), United States | |
Massey University, New Zealand | |
Carnegie Institution of Washington, United States | |
School of Agricultural, Computational and Environmental Sciences | |
University of Hertfordshire, United Kingdom | |
Australian Astronomical Observatory, Australia | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q347y/evidence-for-reflected-light-from-the-most-eccentric-exoplanet-known
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