EPIC 201702477b: A Transiting Brown Dwarf from K2 in a 41 day Orbit
Article
Article Title | EPIC 201702477b: A Transiting Brown Dwarf from K2 in a 41 day Orbit |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Bayliss, D. (Author), Hojjatpanah, S. (Author), Santerne, A. (Author), Dragomir, D. (Author), Zhou, G. (Author), Shporer, A. (Author), Colon, K. D. (Author), Almenara, J. (Author), Armstrong, D. J. (Author), Barrado, D. (Author), Barros, S. C. C. (Author), Bento, J. (Author), Boisse, I. (Author), Bouchy, F. (Author), Brown, D. J. A. (Author), Brown, T. (Author), Cameron, A. (Author), Cochran, W. D. (Author), Demangeon, O. (Author), Deleuil, M. (Author), Diaz, R. F. (Author), Fulton, B. (Author), Horne, K. (Author), Hebrard, G. (Author), Lillo-Box, J. (Author), Lovis, C. (Author), Mawet, D. (Author), Ngo, H. (Author), Osborn, H. (Author), Palle, E. (Author), Petigura, E. (Author), Pollacco, D. (Author), Santos, N. (Author), Sefako, R. (Author), Siverd, R. (Author), Sousa, S. G. (Author) and Tsantaki, M. (Author) |
Journal Title | The Astronomical Journal |
Journal Citation | 153 (1), pp. 1-10 |
Article Number | 15 |
Number of Pages | 10 |
Year | 2016 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/153/1/15 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/153/1/15 |
Abstract | We report the discovery of EPIC 201702477b, a transiting brown dwarf in a long period (40.73691 ±0.00037 day) and eccentric (e = 0.2281 ±0.0026) orbit. This system was initially reported as a planetary candidate based on two transit events seen in K2 Campaign 1 photometry and later validated as an exoplanet candidate. We confirm the transit and refine the ephemeris with two subsequent ground-based detections of the transit using the Las Cumbres Observatory Global Telescope 1 m telescope network. We rule out any transit timing variations above the level of ∼30 s. Using high precision radial velocity measurements from HARPS and SOPHIE we identify the transiting companion as a brown dwarf with a mass, radius, and bulk density of 66.9 ±1.7 M J, 0.757 ±0.065 R J, and 191 ±51 g cm-3 respectively. EPIC 201702477b is the smallest radius brown dwarf yet discovered, with a mass just below the H-burning limit. It has the highest density of any planet, substellar mass object, or main-sequence star discovered so far. We find evidence in the set of known transiting brown dwarfs for two populations of objects - high mass brown dwarfs and low mass brown dwarfs. The higher-mass population have radii in very close agreement to theoretical models, and show a lower-mass limit around 60 M J. This may be the signature of mass-dependent ejection of systems during the formation process. |
Keywords | planetary systems; techniques: photometric; techniques: spectroscopic; Astrophysics - Earth and Planetary Astrophysics |
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 | University of Geneva, Switzerland |
University of Porto, Portugal | |
University of Chicago, United States | |
Center for Astrophysics Harvard and Smithsonian, United States | |
California Institute of Technology (Caltech), United States | |
NASA Ames Research Center, United States | |
Grenoble Alpes University, France | |
University of Warwick, United Kingdom | |
Astrobiology Center, Spain | |
Australian National University | |
Aix-Marseille University, France | |
Las Cumbres Observatory, United States | |
University of St Andrews, United Kingdom | |
University of Texas at Austin, United States | |
University of Hawaii, United States | |
Pierre and Marie Curie University, France | |
European Southern Observatory (ESO), Chile | |
Institute of Astrophysics of the Canary Islands, Spain | |
South African Astronomical Observatory, South Africa | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q6x2q/epic-201702477b-a-transiting-brown-dwarf-from-k2-in-a-41-day-orbit
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