TOI-220 b: a warm sub-Neptune discovered by TESS - Aix-Marseille Université Access content directly
Journal Articles Monthly Notices of the Royal Astronomical Society: Letters Year : 2021

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

M. Deleuil
L. Acu Na
  • Function : Author
J. R. De Medeiros
  • Function : Author
E. Goffo
  • Function : Author
E. Delgado Mena
  • Function : Author
T. A. Lopez
  • Function : Author
K. A. Collins
  • Function : Author
L. M. Serrano
P. Cortés-Zuleta
  • Function : Author
S. B. Howell
  • Function : Author
A. Aguichine
O. Barragán
  • Function : Author
E. M. Bryant
  • Function : Author
K. I. Collins
  • Function : Author
B. F. Cooke
  • Function : Author
M. Esposito
  • Function : Author
E. Furlan
  • Function : Author
S. Hojjatpanah
  • Function : Author
J. Jackman
  • Function : Author
J. M. Jenkins
  • Function : Author
E. L. N. Jensen
  • Function : Author
D. W. Latham
  • Function : Author
I. C. Le Ao
  • Function : Author
R. A. Matson
  • Function : Author
A. Osborn
  • Function : Author
J. F. Otegi
  • Function : Author
F. Rodler
  • Function : Author
S. Sabotta
  • Function : Author
N. J. Scott
  • Function : Author
S. Seager
C. Stockdale
  • Function : Author
P. A. Strøm
  • Function : Author
R. Vanderspek
V. van Eylen
  • Function : Author
J. N. Winn
  • Function : Author
W. D. Cochran
  • Function : Author
O. Demangeon
J. P. Doty
  • Function : Author
W. Fong
  • Function : Author
S. Grziwa
  • Function : Author
E. Knudstrup
  • Function : Author
J. Korth
J. H. Livingston
  • Function : Author
O. Mousis
S. E. Mullally
  • Function : Author
C. M. Persson
  • Function : Author
S. Redfield
J. Smith
J. Šubjak
  • Function : Author
J. D. Twicken
  • Function : Author
D. A. Yahalomi
  • Function : Author

Abstract

In this paper, we report the discovery of TOI-220 b, 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 ± 1.0 M⊕ and radius of 3.03 ± 0.15 R⊕, implying a bulk density of 2.73 ± 0.47 gcm−3⁠. TOI-220 b orbits a relative bright (V= 10.4) and old (10.1 ± 1.4 Gyr) K dwarf star with a period of ∼10.69 d. Thus, TOI-220 b is a new warm sub-Neptune with very precise mass and radius determinations. A Bayesian analysis of the TOI-220 b 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.
Fichier principal
Vignette du fichier
stab1427.pdf (12.6 Mo) Télécharger le fichier
Origin Publisher files allowed on an open archive

Dates and versions

hal-03577487 , version 1 (09-08-2022)

Identifiers

Cite

S. Hoyer, D. Gandolfi, D. J. Armstrong, M. Deleuil, L. Acu Na, et al.. TOI-220 b: a warm sub-Neptune discovered by TESS. Monthly Notices of the Royal Astronomical Society: Letters, 2021, 505 (3), pp.3361-3379. ⟨10.1093/mnras/stab1427⟩. ⟨hal-03577487⟩
88 View
104 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More