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THE K 2-ESPRINT PROJECT . V . A SHORT-PERIOD GIANT PLANET ORBITING A SUBGIANT STAR Citation
| Content Provider | Semantic Scholar |
|---|---|
| Author | Eylen, Vincent Van Albrecht, Simon Gandol, Davide Winn, Joshua N. Hirano, Teriyuki Narita, Norio Bruntt, Hans Prieto-Arranz, Jorge Béjar, V. J. S. Nowak, Grzegorz Lund, Mikkel N. Pall'e, Enric Ribas, I. Sanchis-Ojeda, Roberto Yu, Liang Arriagada, Pamela Butler, Rebecca P. Crane, Jeffrey D. Handberg, Rasmus Deeg, Hans J. Jessen-Hansen, Jens Johnson, John Asher Nespral, David Rogers, Leslie Anne Ryu, Tsuguru Shectman, Stephen A. Shrotriya, Tushar S. Slumstrup, Ditte Takeda, Yo-Ichi Teske, Johanna K. Thompson, Ian Abban Vanderburg, Andrew Wittenmyer, Robert A. |
| Copyright Year | 2016 |
| 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 + R 3.88 0.42 0.48 and + M 1.53 0.12 0.13 , 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 + Å M 50.3 9.4 9.7 . In combination with a radius measurement of Å R 8.3 1.1 , this results in a mean planetary density of + 0.50 0.17 0.29 gcm. We furthermore discover a long-term RV trend, which may be caused by a longperiod 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 mainsequence 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. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://dspace.mit.edu/openaccess-disseminate/1721.1/109573 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
