HD 207897 b: A dense sub-Neptune transiting a nearby and bright K-type star
We present the discovery and characterization of a transiting sub-Neptune that orbits the nearby (28 pc) and bright (V = 8.37) K0V star HD 207897 (TOI-1611) with a 16.20-day period. This discovery is based on photometric measurements from the Transiting Exoplanet Survey Satellite mission and radia...
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
EDP Sciences
2023
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| Online Access: | https://hdl.handle.net/1721.1/148413 |
| _version_ | 1811095924831682560 |
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| author | Seager, Sara |
| author2 | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
| author_facet | Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Seager, Sara |
| author_sort | Seager, Sara |
| collection | MIT |
| description | We present the discovery and characterization of a transiting sub-Neptune that orbits the nearby (28 pc) and bright (V = 8.37) K0V star
HD 207897 (TOI-1611) with a 16.20-day period. This discovery is based on photometric measurements from the Transiting Exoplanet
Survey Satellite mission and radial velocity (RV) observations from the SOPHIE, Automated Planet Finder, and HIRES high-precision
spectrographs. We used EXOFASTv2 to model the parameters of the planet and its host star simultaneously, combining photometric
and RV data to determine the planetary system parameters. We show that the planet has a radius of 2.50 ± 0.08 RE and a mass of either
14.4 ± 1.6 ME or 15.9 ± 1.6 ME with nearly equal probability. The two solutions correspond to two possibilities for the stellar activity
period. The density accordingly is either 5.1 ± 0.7 g cm−3 or 5.5
+0.8
−0.7
g cm−3
, making it one of the relatively rare dense sub-Neptunes.
The existence of this dense planet at only 0.12 AU from its host star is unusual in the currently observed sub-Neptune (2 < RE < 4)
population. The most likely scenario is that this planet has migrated to its current position. |
| first_indexed | 2024-09-23T16:34:21Z |
| format | Article |
| id | mit-1721.1/148413 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T16:34:21Z |
| publishDate | 2023 |
| publisher | EDP Sciences |
| record_format | dspace |
| spelling | mit-1721.1/1484132023-03-09T03:01:48Z HD 207897 b: A dense sub-Neptune transiting a nearby and bright K-type star Seager, Sara Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences We present the discovery and characterization of a transiting sub-Neptune that orbits the nearby (28 pc) and bright (V = 8.37) K0V star HD 207897 (TOI-1611) with a 16.20-day period. This discovery is based on photometric measurements from the Transiting Exoplanet Survey Satellite mission and radial velocity (RV) observations from the SOPHIE, Automated Planet Finder, and HIRES high-precision spectrographs. We used EXOFASTv2 to model the parameters of the planet and its host star simultaneously, combining photometric and RV data to determine the planetary system parameters. We show that the planet has a radius of 2.50 ± 0.08 RE and a mass of either 14.4 ± 1.6 ME or 15.9 ± 1.6 ME with nearly equal probability. The two solutions correspond to two possibilities for the stellar activity period. The density accordingly is either 5.1 ± 0.7 g cm−3 or 5.5 +0.8 −0.7 g cm−3 , making it one of the relatively rare dense sub-Neptunes. The existence of this dense planet at only 0.12 AU from its host star is unusual in the currently observed sub-Neptune (2 < RE < 4) population. The most likely scenario is that this planet has migrated to its current position. 2023-03-08T15:55:34Z 2023-03-08T15:55:34Z 2022 2023-03-08T15:51:51Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/148413 Seager, Sara. 2022. "HD 207897 b: A dense sub-Neptune transiting a nearby and bright K-type star." Astronomy and Astrophysics, 658. en 10.1051/0004-6361/202141429 Astronomy and Astrophysics Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ application/pdf EDP Sciences EDP Sciences |
| spellingShingle | Seager, Sara HD 207897 b: A dense sub-Neptune transiting a nearby and bright K-type star |
| title | HD 207897 b: A dense sub-Neptune transiting a nearby and bright K-type star |
| title_full | HD 207897 b: A dense sub-Neptune transiting a nearby and bright K-type star |
| title_fullStr | HD 207897 b: A dense sub-Neptune transiting a nearby and bright K-type star |
| title_full_unstemmed | HD 207897 b: A dense sub-Neptune transiting a nearby and bright K-type star |
| title_short | HD 207897 b: A dense sub-Neptune transiting a nearby and bright K-type star |
| title_sort | hd 207897 b a dense sub neptune transiting a nearby and bright k type star |
| url | https://hdl.handle.net/1721.1/148413 |
| work_keys_str_mv | AT seagersara hd207897badensesubneptunetransitinganearbyandbrightktypestar |