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 de Astrofísica 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 de Astrofísica 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 de Astrofísica 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 3361-3379Subject Categories
Meteorology and Atmospheric Sciences
Astronomy, Astrophysics and Cosmology
Geophysics
DOI
10.1093/mnras/stab1427