The K2-Esprint Project. V. A short-period giant planet orbiting a subgiant star
Article
Article Title | The K2-Esprint Project. V. A short-period giant planet orbiting a subgiant star |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Van Eylen, Vincent (Author), Albrecht, Simon (Author), Gandolfi, Davide (Author), Dai, Fei (Author), Winn, Joshua (Author), Hirano, Teriyuki (Author), Narita, Norio (Author), Bruntt, Hans (Author), Prieto-Arranz, Jorge (Author), Bejar, Víctor (Author), Nowak, Grzegorz (Author), Lund, Mikkel (Author), Palle, Enric (Author), Ribas, Ignasi (Author), Sanchis-Ojeda, Roberto (Author), Yu, Liang (Author), Arriagada, Pamela (Author), Butler, R. Paul (Author), Crane, Jeffrey D. (Author), Handberg, Rasmus (Author), Deeg, Hans (Author), Jessen-Hansen, Jens (Author), Johnson, John A. (Author), Nespral, David (Author), Rogers, Leslie (Author), Ryu, Tsuguru (Author), Schectman, Stephen (Author), Shrotriya, Tushar (Author), Slumstrup, Ditte (Author), Takeda, Yoichi (Author), Teske, Johanna (Author), Thompson, Ian (Author), Vanderburg, Andrew (Author) and Wittenmyer, Robert (Author) |
Journal Title | The Astronomical Journal |
Journal Citation | 152 (5), pp. 1-11 |
Article Number | 143 |
Number of Pages | 11 |
Year | 2016 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/0004-6256/152/5/143 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/0004-6256/152/5/143 |
Abstract | We report on the discovery and characterization of the transiting planet K2-39b (EPIC 206247743b). With an orbital period of 4.6 days, it is the shortest-period planet orbiting a subgiant star known to date. Such planets are rare, with only a handful of known cases. The reason for this is poorly understood but may reflect differences in planet occurrence around the relatively high-mass stars that have been surveyed, or may be the result of tidal destruction of such planets. K2-39 (EPIC206247743) is an evolved star with a spectroscopically derived stellar radius and mass of 3.88 0.42 0.48 R and 1.53+0.12 0.13 M, respectively, and a very close-in transiting planet, with a R = 3.4. Radial velocity (RV) follow-up using the HARPS, FIES, and PFS instruments leads to a planetary mass of 50.3 9.4 9.7 M. In combination with a radius measurement of 8.3 1.1 R, this results in a mean planetary density of 0.50+0.17 0.29 gcm-3. We furthermore discover a long-term RV trend, which may be caused by a long period planet or stellar companion. Because K2-39b has a short orbital period, its existence makes it seem unlikely that tidal destruction is wholly responsible for the differences in planet populations around subgiant and main sequence stars. Future monitoring of the transits of this system may enable the detection of period decay and constrain the tidal dissipation rates of subgiant stars. © 2016. The American Astronomical Society. |
Keywords | planets and satellites; detection; dynamical evolution andstability; stars; fundamental parameters; K2-39 |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | For access to this article, please click on the URL link provided. |
Byline Affiliations | Aarhus University, Denmark |
University of Turin, Italy | |
Massachusetts Institute of Technology, United States | |
Tokyo Institute of Technology, Japan | |
National Astronomical Observatory of Japan, Japan | |
Institute of Astrophysics of the Canary Islands, Spain | |
Institute of Space Sciences, Spain | |
University of California, United States | |
Carnegie Institution of Washington, United States | |
Center for Astrophysics Harvard and Smithsonian, United States | |
California Institute of Technology (Caltech), United States | |
Carnegie Observatories Pasadena, United States | |
University of New South Wales | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q3x46/the-k2-esprint-project-v-a-short-period-giant-planet-orbiting-a-subgiant-star
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