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.

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

techniques: photometric

planets and satellites: fundamental parameters

techniques: radial velocities

stars: fundamental parameters

Författare

S. Hoyer

Aix-Marseille Université

D. Gandolfi

Universita degli Studi di Torino

D. J. Armstrong

The University of Warwick

M. Deleuil

Aix-Marseille Université

L. Acuna

Aix-Marseille Université

J. R. de Medeiros

Universidade Federal do Rio Grande do Norte

E. Goffo

Universita degli Studi di Torino

J. Lillo-Box

Centro de Astrobiología (INTA-CSIC)

E. Delgado Mena

Universidade do Porto

T. A. Lopez

Aix-Marseille Université

A. Santerne

Aix-Marseille Université

S. Sousa

Universidade do Porto

Malcolm Fridlund

Universiteit Leiden

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

V Adibekyan

Universidade do Porto

K. A. Collins

Harvard-Smithsonian Center for Astrophysics

L. M. Serrano

Universita degli Studi di Torino

P. Cortes-Zuleta

Aix-Marseille Université

S. B. Howell

NASA Ames Research Center

H. Deeg

Instituto Astrofisico de Canarias

Universidad de la Laguna

A. Aguichine

Aix-Marseille Université

O. Barragan

University of Oxford

E. M. Bryant

The University of Warwick

B. L. Canto Martins

Universidade Federal do Rio Grande do Norte

Collins

George Mason University

B. F. Cooke

The University of Warwick

R. F. Diaz

Universidad Nacional de San Martín (UNSAM)

M. Esposito

Thüringer Landessternwarte Tautenburg

E. Furlan

California Institute of Technology (Caltech)

S. Hojjatpanah

Universidade do Porto

J. Jackman

The University of Warwick

J. M. Jenkins

NASA Ames Research Center

E. L. N. Jensen

Swarthmore College

D. W. Latham

Universiteit Leiden

I. C. Leao

Universidade Federal do Rio Grande do Norte

R. A. Matson

US Naval Observatory

L. D. Nielsen

Université de Genève

A. Osborn

The University of Warwick

J. F. Otegi

Universität Zürich

Université de Genève

F. Rodler

European Southern Observatory Santiago

S. Sabotta

Thüringer Landessternwarte Tautenburg

N. J. Scott

NASA Ames Research Center

S. Seager

Massachusetts Institute of Technology (MIT)

C. Stockdale

Hazelwood Observatory

P. A. Strom

The University of Warwick

R. Vanderspek

Massachusetts Institute of Technology (MIT)

V. Van Eylen

University College London (UCL)

P. J. Wheatley

The University of Warwick

J. N. Winn

Princeton University

J. M. Almenara

Université Grenoble Alpes

D. Barrado

Centro de Astrobiología (INTA-CSIC)

S. C. C. Barros

Universidade do Porto

D. Bayliss

The University of Warwick

F. Bouchy

Université de Genève

P. T. Boyd

NASA Goddard Space Flight Center

J. Cabrera

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

W. D. Cochran

The University of Texas at Austin

O. Demangeon

Universidade do Porto

J. P. Doty

Noqsi Aerospace Ltd

X. Dumusque

Université de Genève

P. Figueira

Universidade do Porto

European Southern Observatory Santiago

W. Fong

Massachusetts Institute of Technology (MIT)

S. Grziwa

Universität zu Köln

A. P. Hatzes

Thüringer Landessternwarte Tautenburg

P. Kabath

Czech Academy of Sciences

E. Knudstrup

Aarhus Universitet

J. Korth

Universität zu Köln

J. H. Livingston

University of Tokyo

R. Luque

Universidad de la Laguna

Instituto Astrofisico de Canarias

O. Mousis

Aix-Marseille Université

S. E. Mullally

Space Telescope Science Institute (STScI)

H. P. Osborn

Massachusetts Institute of Technology (MIT)

Universität Bern

E. Palle

Instituto Astrofisico de Canarias

Universidad de la Laguna

Carina Persson

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

S. Redfield

Wesleyan University

N. C. Santos

Universidade do Porto

J. Smith

NASA Ames Research Center

SETI Institute

J. Subjak

Czech Academy of Sciences

J. D. Twicken

SETI Institute

NASA Ames Research Center

S. Udry

Université de Genève

D. A. Yahalomi

Columbia University

Harvard-Smithsonian Center for Astrophysics

Monthly Notices of the Royal Astronomical Society

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

Vol. 505 3 3361-3379

Ämneskategorier

Meteorologi och atmosfärforskning

Astronomi, astrofysik och kosmologi

Geofysik

DOI

10.1093/mnras/stab1427

Mer information

Senast uppdaterat

2021-08-16