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

Author

S. Hoyer

Aix Marseille University

D. Gandolfi

University of Turin

D. J. Armstrong

The University of Warwick

M. Deleuil

Aix Marseille University

L. Acuna

Aix Marseille University

J. R. de Medeiros

Federal University of Rio Grande do Norte

E. Goffo

University of Turin

J. Lillo-Box

Spanish Astrobiology Center (INTA-CSIC)

E. Delgado Mena

University of Porto

T. A. Lopez

Aix Marseille University

A. Santerne

Aix Marseille University

S. Sousa

University of Porto

Malcolm Fridlund

Leiden University

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

V Adibekyan

University of Porto

K. A. Collins

Harvard-Smithsonian Center for Astrophysics

L. M. Serrano

University of Turin

P. Cortes-Zuleta

Aix Marseille University

S. B. Howell

NASA Ames Research Center

H. Deeg

Instituto Astrofisico de Canarias

University of La Laguna

A. Aguichine

Aix Marseille University

O. Barragan

University of Oxford

E. M. Bryant

The University of Warwick

B. L. Canto Martins

Federal University of Rio Grande do Norte

Collins

George Mason University

B. F. Cooke

The University of Warwick

R. F. Diaz

National University of General San Martin (UNSAM)

M. Esposito

Thüringer Landessternwarte Tautenburg

E. Furlan

California Institute of Technology (Caltech)

S. Hojjatpanah

University of Porto

J. Jackman

The University of Warwick

J. M. Jenkins

NASA Ames Research Center

E. L. N. Jensen

Swarthmore College

D. W. Latham

Leiden University

I. C. Leao

Federal University of Rio Grande do Norte

R. A. Matson

US Naval Observatory

L. D. Nielsen

University of Geneva

A. Osborn

The University of Warwick

J. F. Otegi

University of Zürich

University of Geneva

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

Grenoble Alpes University

D. Barrado

Spanish Astrobiology Center (INTA-CSIC)

S. C. C. Barros

University of Porto

D. Bayliss

The University of Warwick

F. Bouchy

University of Geneva

P. T. Boyd

NASA Goddard Space Flight Center

J. Cabrera

German Aerospace Center (DLR)

W. D. Cochran

The University of Texas at Austin

O. Demangeon

University of Porto

J. P. Doty

Noqsi Aerospace Ltd

X. Dumusque

University of Geneva

P. Figueira

University of Porto

European Southern Observatory Santiago

W. Fong

Massachusetts Institute of Technology (MIT)

S. Grziwa

University of Cologne

A. P. Hatzes

Thüringer Landessternwarte Tautenburg

P. Kabath

Czech Academy of Sciences

E. Knudstrup

Aarhus University

J. Korth

University of Cologne

J. H. Livingston

University of Tokyo

R. Luque

University of La Laguna

Instituto Astrofisico de Canarias

O. Mousis

Aix Marseille University

S. E. Mullally

Space Telescope Science Institute (STScI)

H. P. Osborn

Massachusetts Institute of Technology (MIT)

University of Bern

E. Palle

Instituto Astrofisico de Canarias

University of La Laguna

Carina Persson

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

S. Redfield

Wesleyan University

N. C. Santos

University of 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

University of Geneva

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

Subject Categories

Meteorology and Atmospheric Sciences

Astronomy, Astrophysics and Cosmology

Geophysics

DOI

10.1093/mnras/stab1427

More information

Latest update

8/16/2021