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

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Hoyer, S., Gandolfi, D., Armstrong, David J., Deleuil, M., Acuña, L., de Medeiros, J. R., Goffo, E., Lillo-Box, J., Delgado Mena, E., Lopez, T. A. et al.
(2021) TOI-220 b : a warm sub-Neptune discovered by TESS. Monthly Notices of the Royal Astronomical Society, 505 (3). pp. 3361-3379. doi:10.1093/mnras/stab1427

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Official URL: http://dx.doi.org/10.1093/mnras/stab1427

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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.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Planetary systems, Satellites -- Orbits, Neptune (Planet) -- Satellites, Extrasolar planets -- Detection
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Oxford University Press
ISSN: 1745-3933
Official Date: August 2021
Dates:
DateEvent
August 2021Published
22 May 2021Available
4 May 2021Accepted
Volume: 505
Number: 3
Page Range: pp. 3361-3379
DOI: 10.1093/mnras/stab1427
Status: Peer Reviewed
Publication Status: Published
Reuse Statement (publisher, data, author rights): This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record S Hoyer, D Gandolfi, D J Armstrong, M Deleuil, L Acuña, J R de Medeiros, E Goffo, J Lillo-Box, E Delgado Mena, T A Lopez, A Santerne, S Sousa, M Fridlund, V Adibekyan, K A Collins, L M Serrano, P Cortés-Zuleta, S B Howell, H Deeg, A Aguichine, O Barragán, E M Bryant, B L Canto Martins, K I Collins, B F Cooke, R F Díaz, M Esposito, E Furlan, S Hojjatpanah, J Jackman, J M Jenkins, E L N Jensen, D W Latham, I C Leão, R A Matson, L D Nielsen, A Osborn, J F Otegi, F Rodler, S Sabotta, N J Scott, S Seager, C Stockdale, P A Strøm, R Vanderspek, V Van Eylen, P J Wheatley, J N Winn, J M Almenara, D Barrado, S C C Barros, D Bayliss, F Bouchy, P T Boyd, J Cabrera, W D Cochran, O Demangeon, J P Doty, X Dumusque, P Figueira, W Fong, S Grziwa, A P Hatzes, P Kabáth, E Knudstrup, J Korth, J H Livingston, R Luque, O Mousis, S E Mullally, H P Osborn, E Pallé, C M Persson, S Redfield, N C Santos, J Smith, J Šubjak, J D Twicken, S Udry, D A Yahalomi, TOI-220 b: a warm sub-Neptune discovered by TESS, Monthly Notices of the Royal Astronomical Society, Volume 505, Issue 3, August 2021, Pages 3361–3379, https://doi.org/10.1093/mnras/stab1427 is available online at: http://dx.doi.org/10.1093/mnras/stab1427
Access rights to Published version: Restricted or Subscription Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
837319Centre National d’Etudes Spatialeshttp://dx.doi.org/10.13039/501100002830
UID/FIS/04434/2019Fundação para a Ciência e a Tecnologiahttp://dx.doi.org/10.13039/501100001871
UIDB/04434/2020Fundação para a Ciência e a Tecnologiahttp://dx.doi.org/10.13039/501100001871
UIDP/04434/2020Fundação para a Ciência e a Tecnologiahttp://dx.doi.org/10.13039/501100001871
PTDC/FIS-AST/32113/2017 Fundação para a Ciência e a Tecnologiahttp://dx.doi.org/10.13039/501100001871
POCI-01-0145-FEDER-032113Fundação para a Ciência e a Tecnologiahttp://dx.doi.org/10.13039/501100001871
PTDC/FIS-AST/28953/2017 Fundação para a Ciência e a Tecnologiahttp://dx.doi.org/10.13039/501100001871
POCI01-0145-FEDER-028953Fundação para a Ciência e a Tecnologiahttp://dx.doi.org/10.13039/501100001871
IF/00650/2015/CP1273/CT0001Fundação para a Ciência e a Tecnologiahttp://dx.doi.org/10.13039/501100001871
IF/00849/2015/CP1273/CT0003Fundação para a Ciência e a Tecnologiahttp://dx.doi.org/10.13039/501100001871
IF/01312/2014/CP1215/CT0004Fundação para a Ciência e a Tecnologiahttp://dx.doi.org/10.13039/501100001871
CEECIND/00826/2018–POPH/FSE(EC) Fundação para a Ciência e a Tecnologiahttp://dx.doi.org/10.13039/501100001871
DL57/2016/CP1364/ CT0004Fundação para a Ciência e a Tecnologiahttp://dx.doi.org/10.13039/501100001871
PD/BD/128119/2016Fundação para a Ciência e a Tecnologiahttp://dx.doi.org/10.13039/501100001871
ST/R00384X/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
2018.2323 Fondazione Cassa di Risparmio di Torinohttp://viaf.org/viaf/153629121
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