TOI-220b: a warm sub-Neptune discovered by TESS
Artikel i vetenskaplig tidskrift, 2021

In this paper, we report the discovery of TOI-220b, 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 +/- 1.0M(circle plus) and radius of 3.03 +/- 0.15R(circle plus), implying a bulk density of 2.73 +/- 0.47. TOI-220b orbits a relative bright (V=10.4) and old (10.1 +/- 1.4Gyr) K dwarf star with a period of similar to 10.69d. Thus, TOI-220b is a new warm sub-Neptune with very precise mass and radius determinations. A Bayesian analysis of the TOI-220b 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.

stars: fundamental parameters

planets and satellites: individual: TYC 8897-01263-1

techniques: radial velocities

planets and satellites: fundamental parameters

techniques: photometric

Visa alla personer

Publicerad i

Monthly Notices of the Royal Astronomical Society

0035-8711 (ISSN) 1365-2966 (eISSN)

Vol. 505 Nummer/häfte 3 s. 3361-3379

Kategorisering

Ämneskategorier (SSIF 2011)

Meteorologi och atmosfärforskning

Astronomi, astrofysik och kosmologi

Geofysik

Identifikatorer

DOI

10.1093/mnras/stab1427

Mer information

Senast uppdaterat

2025-03-09