THE K2-ESPRINT PROJECT. V. A SHORT-PERIOD GIANT PLANET ORBITING A SUBGIANT STAR
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 und...
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| Format: | Article |
| Language: | en_US |
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IOP Publishing
2017
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| Online Access: | http://hdl.handle.net/1721.1/109573 https://orcid.org/0000-0002-8958-0683 https://orcid.org/0000-0002-4265-047X https://orcid.org/0000-0003-1667-5427 |
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| author | Van Eylen, Vincent Albrecht, Simon Gandolf, Davide Hirano, Teriyuki Narita, Norio Bruntt, Hans Prieto-Arranz, Jorge Béjar, Víctor J. S. Nowak, Grzegorz Lund, Mikkel N. Palle, Enric Ribas, Ignasi Sanchis-Ojeda, Roberto Arriagada, Pamela Butler, R. Paul Crane, Jeffrey D. Handberg, Rasmus Deeg, Hans Jessen-Hansen, Jens Johnson, John A. Nespra, David Rogers, Leslie Ryu, Tsuguru Shectman, Stephen Shrotriya, Tushar Slumstrup, Ditte Takeda, Yoichi Teske, Johanna Thompson, Ian Vanderburg, Andrew Wittenmyer, Robert Dai, Fei Yu, Liang Winn, Joshua Nathan |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Van Eylen, Vincent Albrecht, Simon Gandolf, Davide Hirano, Teriyuki Narita, Norio Bruntt, Hans Prieto-Arranz, Jorge Béjar, Víctor J. S. Nowak, Grzegorz Lund, Mikkel N. Palle, Enric Ribas, Ignasi Sanchis-Ojeda, Roberto Arriagada, Pamela Butler, R. Paul Crane, Jeffrey D. Handberg, Rasmus Deeg, Hans Jessen-Hansen, Jens Johnson, John A. Nespra, David Rogers, Leslie Ryu, Tsuguru Shectman, Stephen Shrotriya, Tushar Slumstrup, Ditte Takeda, Yoichi Teske, Johanna Thompson, Ian Vanderburg, Andrew Wittenmyer, Robert Dai, Fei Yu, Liang Winn, Joshua Nathan |
| author_sort | Van Eylen, Vincent |
| collection | MIT |
| description | 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 (EPIC 206247743) is an evolved star with a spectroscopically derived stellar radius and mass of 3.88 [subscript -0.42] [superscript +0.48] R [subscript ⊙] and 1.53[subscript-0.12] [superscript +0.13] M[subscript ⊙], respectively, and a very close-in transiting planet, with a/R [subscript asterisk]= 3.4 Radial velocity (RV) follow-up using the HARPS, FIES, and PFS instruments leads to a planetary mass of 50.3 [subscript -9.4] [superscript +9.7] M [subscript ⊙]. In combination with a radius measurement of 8.3 ± 1.1 R [subscript oplus], this results in a mean planetary density of 0.50 [subscript -0.17] [superscript +0.29] g cm [superscript -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. |
| first_indexed | 2024-09-23T10:07:46Z |
| format | Article |
| id | mit-1721.1/109573 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T10:07:46Z |
| publishDate | 2017 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/1095732022-09-26T15:55:55Z THE K2-ESPRINT PROJECT. V. A SHORT-PERIOD GIANT PLANET ORBITING A SUBGIANT STAR Van Eylen, Vincent Albrecht, Simon Gandolf, Davide Hirano, Teriyuki Narita, Norio Bruntt, Hans Prieto-Arranz, Jorge Béjar, Víctor J. S. Nowak, Grzegorz Lund, Mikkel N. Palle, Enric Ribas, Ignasi Sanchis-Ojeda, Roberto Arriagada, Pamela Butler, R. Paul Crane, Jeffrey D. Handberg, Rasmus Deeg, Hans Jessen-Hansen, Jens Johnson, John A. Nespra, David Rogers, Leslie Ryu, Tsuguru Shectman, Stephen Shrotriya, Tushar Slumstrup, Ditte Takeda, Yoichi Teske, Johanna Thompson, Ian Vanderburg, Andrew Wittenmyer, Robert Dai, Fei Yu, Liang Winn, Joshua Nathan Massachusetts Institute of Technology. Department of Physics MIT Kavli Institute for Astrophysics and Space Research Dai, Fei Winn, Joshua N. Yu, Liang 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 (EPIC 206247743) is an evolved star with a spectroscopically derived stellar radius and mass of 3.88 [subscript -0.42] [superscript +0.48] R [subscript ⊙] and 1.53[subscript-0.12] [superscript +0.13] M[subscript ⊙], respectively, and a very close-in transiting planet, with a/R [subscript asterisk]= 3.4 Radial velocity (RV) follow-up using the HARPS, FIES, and PFS instruments leads to a planetary mass of 50.3 [subscript -9.4] [superscript +9.7] M [subscript ⊙]. In combination with a radius measurement of 8.3 ± 1.1 R [subscript oplus], this results in a mean planetary density of 0.50 [subscript -0.17] [superscript +0.29] g cm [superscript -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. 2017-06-02T22:34:19Z 2017-06-02T22:34:19Z 2016-10 2016-05 Article http://purl.org/eprint/type/JournalArticle 1538-3881 0004-6256 http://hdl.handle.net/1721.1/109573 Van Eylen, Vincent, Simon Albrecht, Davide Gandolfi, Fei Dai, Joshua N. Winn, Teriyuki Hirano, Norio Narita, et al. “THE K2-ESPRINT PROJECT. V. A SHORT-PERIOD GIANT PLANET ORBITING A SUBGIANT STAR.” The Astronomical Journal 152, no. 5 (October 26, 2016): 143. © 2016 The American Astronomical Society https://orcid.org/0000-0002-8958-0683 https://orcid.org/0000-0002-4265-047X https://orcid.org/0000-0003-1667-5427 en_US http://dx.doi.org/10.3847/0004-6256/152/5/143 Astronomical Journal Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf IOP Publishing IOP Publishing |
| spellingShingle | Van Eylen, Vincent Albrecht, Simon Gandolf, Davide Hirano, Teriyuki Narita, Norio Bruntt, Hans Prieto-Arranz, Jorge Béjar, Víctor J. S. Nowak, Grzegorz Lund, Mikkel N. Palle, Enric Ribas, Ignasi Sanchis-Ojeda, Roberto Arriagada, Pamela Butler, R. Paul Crane, Jeffrey D. Handberg, Rasmus Deeg, Hans Jessen-Hansen, Jens Johnson, John A. Nespra, David Rogers, Leslie Ryu, Tsuguru Shectman, Stephen Shrotriya, Tushar Slumstrup, Ditte Takeda, Yoichi Teske, Johanna Thompson, Ian Vanderburg, Andrew Wittenmyer, Robert Dai, Fei Yu, Liang Winn, Joshua Nathan THE K2-ESPRINT PROJECT. V. A SHORT-PERIOD GIANT PLANET ORBITING A SUBGIANT STAR |
| title | THE K2-ESPRINT PROJECT. V. A SHORT-PERIOD GIANT PLANET ORBITING A SUBGIANT STAR |
| title_full | THE K2-ESPRINT PROJECT. V. A SHORT-PERIOD GIANT PLANET ORBITING A SUBGIANT STAR |
| title_fullStr | THE K2-ESPRINT PROJECT. V. A SHORT-PERIOD GIANT PLANET ORBITING A SUBGIANT STAR |
| title_full_unstemmed | THE K2-ESPRINT PROJECT. V. A SHORT-PERIOD GIANT PLANET ORBITING A SUBGIANT STAR |
| title_short | THE K2-ESPRINT PROJECT. V. A SHORT-PERIOD GIANT PLANET ORBITING A SUBGIANT STAR |
| title_sort | k2 esprint project v a short period giant planet orbiting a subgiant star |
| url | http://hdl.handle.net/1721.1/109573 https://orcid.org/0000-0002-8958-0683 https://orcid.org/0000-0002-4265-047X https://orcid.org/0000-0003-1667-5427 |
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