TOI-1201 b: a mini-Neptune transiting a bright and moderately young M dwarf
We present the discovery of a transiting mini-Neptune around TOI-1201, a relatively bright and moderately young early M dwarf (J ≈ 9.5 mag, ∼600–800 Myr) in an equal-mass ∼8 arcsecond-wide binary system, using data from the Transiting Exoplanet Survey Satellite, along with follow-up transit observa...
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| Other Authors: | |
| Format: | Article |
| Language: | English |
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EDP Sciences
2023
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| Online Access: | https://hdl.handle.net/1721.1/148420 |
| _version_ | 1826198245686116352 |
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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 of a transiting mini-Neptune around TOI-1201, a relatively bright and moderately young early M dwarf (J ≈
9.5 mag, ∼600–800 Myr) in an equal-mass ∼8 arcsecond-wide binary system, using data from the Transiting Exoplanet Survey Satellite, along with follow-up transit observations. With an orbital period of 2.49 d, TOI-1201 b is a warm mini-Neptune with a radius
of Rb = 2.415 ± 0.090 R⊕. This signal is also present in the precise radial velocity measurements from CARMENES, confirming the
existence of the planet and providing a planetary mass of Mb = 6.28 ± 0.88 M⊕ and, thus, an estimated bulk density of 2.45+0.48
−0.42 g cm−3
.
The spectroscopic observations additionally show evidence of a signal with a period of 19 d and a long periodic variation of undetermined origin. In combination with ground-based photometric monitoring from WASP-South and ASAS-SN, we attribute the 19 d
signal to the stellar rotation period (Prot = 19–23 d), although we cannot rule out that the variation seen in photometry belongs to the
visually close binary companion. We calculate precise stellar parameters for both TOI-1201 and its companion. The transiting planet
is an excellent target for atmosphere characterization (the transmission spectroscopy metric is 97+21
−16) with the upcoming James Webb
Space Telescope. It is also feasible to measure its spin-orbit alignment via the Rossiter-McLaughlin effect using current state-of-the-art
spectrographs with submeter per second radial velocity precision |
| first_indexed | 2024-09-23T11:01:41Z |
| format | Article |
| id | mit-1721.1/148420 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T11:01:41Z |
| publishDate | 2023 |
| publisher | EDP Sciences |
| record_format | dspace |
| spelling | mit-1721.1/1484202023-03-09T03:32:43Z TOI-1201 b: a mini-Neptune transiting a bright and moderately young M dwarf Seager, Sara Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences We present the discovery of a transiting mini-Neptune around TOI-1201, a relatively bright and moderately young early M dwarf (J ≈ 9.5 mag, ∼600–800 Myr) in an equal-mass ∼8 arcsecond-wide binary system, using data from the Transiting Exoplanet Survey Satellite, along with follow-up transit observations. With an orbital period of 2.49 d, TOI-1201 b is a warm mini-Neptune with a radius of Rb = 2.415 ± 0.090 R⊕. This signal is also present in the precise radial velocity measurements from CARMENES, confirming the existence of the planet and providing a planetary mass of Mb = 6.28 ± 0.88 M⊕ and, thus, an estimated bulk density of 2.45+0.48 −0.42 g cm−3 . The spectroscopic observations additionally show evidence of a signal with a period of 19 d and a long periodic variation of undetermined origin. In combination with ground-based photometric monitoring from WASP-South and ASAS-SN, we attribute the 19 d signal to the stellar rotation period (Prot = 19–23 d), although we cannot rule out that the variation seen in photometry belongs to the visually close binary companion. We calculate precise stellar parameters for both TOI-1201 and its companion. The transiting planet is an excellent target for atmosphere characterization (the transmission spectroscopy metric is 97+21 −16) with the upcoming James Webb Space Telescope. It is also feasible to measure its spin-orbit alignment via the Rossiter-McLaughlin effect using current state-of-the-art spectrographs with submeter per second radial velocity precision 2023-03-08T17:55:06Z 2023-03-08T17:55:06Z 2021 2023-03-08T16:25:18Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/148420 Seager, Sara. 2021. "TOI-1201 b: a mini-Neptune transiting a bright and moderately young M dwarf." Astronomy and Astrophysics, 656. en 10.1051/0004-6361/202141587 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 TOI-1201 b: a mini-Neptune transiting a bright and moderately young M dwarf |
| title | TOI-1201 b: a mini-Neptune transiting a bright and moderately young M dwarf |
| title_full | TOI-1201 b: a mini-Neptune transiting a bright and moderately young M dwarf |
| title_fullStr | TOI-1201 b: a mini-Neptune transiting a bright and moderately young M dwarf |
| title_full_unstemmed | TOI-1201 b: a mini-Neptune transiting a bright and moderately young M dwarf |
| title_short | TOI-1201 b: a mini-Neptune transiting a bright and moderately young M dwarf |
| title_sort | toi 1201 b a mini neptune transiting a bright and moderately young m dwarf |
| url | https://hdl.handle.net/1721.1/148420 |
| work_keys_str_mv | AT seagersara toi1201baminineptunetransitingabrightandmoderatelyyoungmdwarf |