TOI-220 b: a warm sub-Neptune discovered by TESS

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 precisi...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Veröffentlicht in:	Monthly notices of the Royal Astronomical Society 2021-06, Vol.505 (3), p.3361-3379
Hauptverfasser:	Hoyer, S, Gandolfi, D, Armstrong, D J, Deleuil, M, Acuña, L, de Medeiros, J R, Goffo, E, Lillo-Box, J, Delgado Mena, E, Lopez, T A, Santerne, A, Sousa, S, Fridlund, M, Adibekyan, V, Collins, K A, Serrano, L M, Cortés-Zuleta, P, Howell, S B, Deeg, H, Aguichine, A, Barragán, O, Bryant, E M, Canto Martins, B L, Collins, K I, Cooke, B F, Díaz, R F, Esposito, M, Furlan, E, Hojjatpanah, S, Jackman, J, Jenkins, J M, Jensen, E L N, Latham, D W, Leão, I C, Matson, R A, Nielsen, L D, Osborn, A, Otegi, J F, Rodler, F, Sabotta, S, Scott, N J, Seager, S, Stockdale, C, Strøm, P A, Vanderspek, R, Van Eylen, V, Wheatley, P J, Winn, J N, Almenara, J M, Barrado, D, Barros, S C C, Bayliss, D, Bouchy, F, Boyd, P T, Cabrera, J, Cochran, W D, Demangeon, O, Doty, J P, Dumusque, X, Figueira, P, Fong, W, Grziwa, S, Hatzes, A P, Kabáth, P, Knudstrup, E, Korth, J, Livingston, J H, Luque, R, Mousis, O, Mullally, S E, Osborn, H P, Pallé, E, Persson, C M, Redfield, S, Santos, N C, Smith, J, Šubjak, J, Twicken, J D, Udry, S, Yahalomi, D A
Format:	Artikel
Sprache:	eng
Schlagworte:	Astrophysics Earth and Planetary Astrophysics Physics
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	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 $\rm {g\,cm}^{-3}$. 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.
ISSN:	0035-8711 1745-3933 1365-2966
DOI:	10.1093/mnras/stab1427