Data di Pubblicazione:
2021
Abstract:
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.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
techniques: photometric; techniques: radial velocities; planets and satellites: fundamental parameters; planets and satellites: individual: TYC 8897-01263-1; stars: fundamental parameters
Elenco autori:
Hoyer, S; Gandolfi, D; Armstrong, DJ; Deleuil, M; Acuña, L; de Medeiros, JR; Goffo, E; Lillo-Box, J; Mena, ED; Lopez, TA; Santerne, A; Sousa, S; Fridlund, M; Adibekyan, V; Collins, KA; Serrano, LM; Cortés-Zuleta, P; Howell, SB; Deeg, H; Aguichine, A; Barragán, O; Bryant, EM; Martins, BLC; Collins, KI; Cooke, BF; Díaz, RF; Esposito, M; Furlan, E; Hojjatpanah, S; Jackman, J; Jenkins, JM; Jensen, ELN; Latham, DW; Leao, IC; Matson, RA; Nielsen, LD; Osborn, A; Otegi, JF; Rodler, F; Sabotta, S; Scott, NJ; Seager, S; Stockdale, C; Strom, PA; Vanderspek, R; Van Eylen, V; Wheatley, PJ; Winn, JN; Almenara, JM; Barrado, D; Barros, SCC; Bayliss, D; Bouchy, F; Boyd, PT; Cabrera, J; Cochran, WD; Demangeon, O; Doty, JP; Dumusque, X; Figueira, P; Fong, W; Grziwa, S; Hatzes, AP; Kabáth, P; Knudstrup, E; Korth, J; Livingston, JH; Luque, R; Mousis, O; Mullally, SE; Osborn, HP; Pallé, E; Persson, CM; Redfield, S; Santos, NC; Smith, J; Subjak, J; Twicken, JD; Udry, S; Yahalomi, DA
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