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

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. AguichineO. 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

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskriftPeer review

Sammanfattning

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 g cm-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.

Originalspråkengelska
Sidor (från-till)3361-3379
Antal sidor19
TidskriftMonthly Notices of the Royal Astronomical Society
Volym505
Nummer3
DOI
StatusPublished - 2021 aug. 1
Externt publiceradJa

Bibliografisk information

Publisher Copyright:
© 2021 The Author(s).

Fingeravtryck

Utforska forskningsämnen för ”TOI-220 b: A warm sub-Neptune discovered by TESS”. Tillsammans bildar de ett unikt fingeravtryck.

Citera det här