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TOI-220 b : a warm sub-Neptune discovered by TESS
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(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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WRAP-TOI-220b-a-warm-sub-Neptune-discovered-by-TESS-Armstrong-2021.pdf - Accepted Version - Requires a PDF viewer. Download (2407Kb) | Preview |
Official URL: http://dx.doi.org/10.1093/mnras/stab1427
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 | |||||||||||||||||||||||||||||||||||||||||||||||||||
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| Subjects: | Q Science > QB Astronomy | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Divisions: | Faculty of 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: |
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| Volume: | 505 | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Number: | 3 | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Page Range: | pp. 3361-3379 | |||||||||||||||||||||||||||||||||||||||||||||||||||
| DOI: | 10.1093/mnras/stab1427 | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Status: | Peer Reviewed | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Publication Status: | Published | |||||||||||||||||||||||||||||||||||||||||||||||||||
| Publisher Statement: | 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 | |||||||||||||||||||||||||||||||||||||||||||||||||||
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