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 de Astrofísica 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 de Astrofísica 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 de Astrofísica 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 3361-3379Ämneskategorier
Meteorologi och atmosfärforskning
Astronomi, astrofysik och kosmologi
Geofysik
DOI
10.1093/mnras/stab1427