Hoyer, S;
Gandolfi, D;
Armstrong, DJ;
Deleuil, M;
Acuña, L;
Medeiros, JRD;
Goffo, E;
... Yahalomi, DA; + view all
(2021)
TOI-220 b: a warm sub-Neptune discovered by TESS.
Monthly Notices of the Royal Astronomical Society
, 505
(3)
pp. 3361-3379.
10.1093/mnras/stab1427.
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Abstract
In this paper, we report the discovery of TOI-220 b, a new sub-Neptune detected by the Transiting Exoplanet Survey Satellite (TESS) and confirmed by radial velocity follow-up observations with the HARPS spectrograph. Based on the combined analysis of TESS transit photometry and high precision radial velocity measurements, we estimate a planetary mass of 13.8 ± 1.0 M⊕ and radius of 3.03 ± 0.15 R⊕, implying a bulk density of 2.73 ± 0.47 gcm−3. TOI-220 b orbits a relative bright (V= 10.4) and old (10.1 ± 1.4 Gyr) K dwarf star with a period of ∼10.69 d. Thus, TOI-220 b is a new warm sub-Neptune with very precise mass and radius determinations. A Bayesian analysis of the TOI-220 b internal structure indicates that due to the strong irradiation it receives, the low density of this planet could be explained with a steam atmosphere in radiative–convective equilibrium and a supercritical water layer on top of a differentiated interior made of a silicate mantle and a small iron core.
| Type: | Article |
|---|---|
| Title: | TOI-220 b: a warm sub-Neptune discovered by TESS |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stab1427 |
| Publisher version: | https://doi.org/10.1093/mnras/stab1427 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | techniques: photometric, techniques: radial velocities, planets and satellites: fundamental parameters, planets and satellites: individual: TYC 8897-01263-1, stars: fundamental parameters |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10129408 |
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