| _version_ |
1811070021269454848
|
| collection |
MIT
|
| description |
<jats:title>ABSTRACT</jats:title>
<jats:p>We report on the discovery and validation of a two-planet system around a bright (V = 8.85 mag) early G dwarf (1.43 R⊙, 1.15 M⊙, TOI 2319) using data from NASA’s Transiting Exoplanet Survey Satellite (TESS). Three transit events from two planets were detected by citizen scientists in the month-long TESS light curve (sector 25), as part of the Planet Hunters TESS project. Modelling of the transits yields an orbital period of $11.6264 _{ - 0.0025 } ^ { + 0.0022 }$ d and radius of $3.41 _{ - 0.12 } ^ { + 0.14 }$ R⊕ for the inner planet, and a period in the range 19.26–35 d and a radius of $5.83 _{ - 0.14 } ^ { + 0.14 }$ R⊕ for the outer planet, which was only seen to transit once. Each signal was independently statistically validated, taking into consideration the TESS light curve as well as the ground-based spectroscopic follow-up observations. Radial velocities from HARPS-N and EXPRES yield a tentative detection of planet b, whose mass we estimate to be $11.56 _{ - 6.14 } ^ { + 6.58 }$ M⊕, and allow us to place an upper limit of 27.5 M⊕ (99 per cent confidence) on the mass of planet c. Due to the brightness of the host star and the strong likelihood of an extended H/He atmosphere on both planets, this system offers excellent prospects for atmospheric characterization and comparative planetology.</jats:p>
|
| first_indexed |
2024-09-23T08:21:10Z
|
| format |
Article
|
| id |
mit-1721.1/135642
|
| institution |
Massachusetts Institute of Technology
|
| language |
English
|
| last_indexed |
2024-09-23T08:21:10Z
|
| publishDate |
2021
|
| publisher |
Oxford University Press (OUP)
|
| record_format |
dspace
|
| spelling |
mit-1721.1/1356422022-04-01T17:27:47Z Planet Hunters TESS III: two transiting planets around the bright G dwarf HD 152843 <jats:title>ABSTRACT</jats:title> <jats:p>We report on the discovery and validation of a two-planet system around a bright (V = 8.85 mag) early G dwarf (1.43 R⊙, 1.15 M⊙, TOI 2319) using data from NASA’s Transiting Exoplanet Survey Satellite (TESS). Three transit events from two planets were detected by citizen scientists in the month-long TESS light curve (sector 25), as part of the Planet Hunters TESS project. Modelling of the transits yields an orbital period of $11.6264 _{ - 0.0025 } ^ { + 0.0022 }$ d and radius of $3.41 _{ - 0.12 } ^ { + 0.14 }$ R⊕ for the inner planet, and a period in the range 19.26–35 d and a radius of $5.83 _{ - 0.14 } ^ { + 0.14 }$ R⊕ for the outer planet, which was only seen to transit once. Each signal was independently statistically validated, taking into consideration the TESS light curve as well as the ground-based spectroscopic follow-up observations. Radial velocities from HARPS-N and EXPRES yield a tentative detection of planet b, whose mass we estimate to be $11.56 _{ - 6.14 } ^ { + 6.58 }$ M⊕, and allow us to place an upper limit of 27.5 M⊕ (99 per cent confidence) on the mass of planet c. Due to the brightness of the host star and the strong likelihood of an extended H/He atmosphere on both planets, this system offers excellent prospects for atmospheric characterization and comparative planetology.</jats:p> 2021-10-27T20:24:24Z 2021-10-27T20:24:24Z 2021 2021-09-27T18:24:12Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/135642 en 10.1093/mnras/stab1253 Monthly Notices of the Royal Astronomical Society Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf Oxford University Press (OUP) arXiv
|
| spellingShingle |
Planet Hunters TESS III: two transiting planets around the bright G dwarf HD 152843
|
| title |
Planet Hunters TESS III: two transiting planets around the bright G dwarf HD 152843
|
| title_full |
Planet Hunters TESS III: two transiting planets around the bright G dwarf HD 152843
|
| title_fullStr |
Planet Hunters TESS III: two transiting planets around the bright G dwarf HD 152843
|
| title_full_unstemmed |
Planet Hunters TESS III: two transiting planets around the bright G dwarf HD 152843
|
| title_short |
Planet Hunters TESS III: two transiting planets around the bright G dwarf HD 152843
|
| title_sort |
planet hunters tess iii two transiting planets around the bright g dwarf hd 152843
|
| url |
https://hdl.handle.net/1721.1/135642
|