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

Authors :
Hoyer, S.
Gandolfi, D.
Armstrong, D. J.
Deleuil, M.
Acuna, L.
de Medeiros, J. R.
Goffo, E.
Lillo-Box, J.
Delgado Mena, E.
Lopez, T. A.
Santerne, A.
Sousa, S.
Fridlund, M.
Adibekyan, V
Collins, K. A.
Serrano, L. M.
Cortes-Zuleta, P.
Howell, S. B.
Deeg, H.
Aguichine, A.
Barragan, O.
Bryant, E. M.
Canto Martins, B. L.
Collins, K., I
Cooke, B. F.
Diaz, R. F.
Esposito, M.
Furlan, E.
Hojjatpanah, S.
Jackman, J.
Jenkins, J. M.
Jensen, E. L. N.
Latham, D. W.
Leao, I. C.
Matson, R. A.
Nielsen, L. D.
Osborn, A.
Otegi, J. F.
Rodler, F.
Sabotta, S.
Scott, N. J.
Seager, S.
Stockdale, C.
Strom, P. A.
Vanderspek, R.
Van Eylen, V.
Wheatley, P. J.
Winn, J. N.
Almenara, J. M.
Barrado, D.
Barros, S. C. C.
Bayliss, D.
Bouchy, F.
Boyd, P. T.
Cabrera, J.
Cochran, W. D.
Demangeon, O.
Doty, J. P.
Dumusque, X.
Figueira, P.
Fong, W.
Grziwa, S.
Hatzes, A. P.
Kabath, P.
Knudstrup, E.
Korth, J.
Livingston, J. H.
Luque, R.
Mousis, O.
Mullally, S. E.
Osborn, H. P.
Palle, E.
Persson, C. M.
Redfield, S.
Santos, N. C.
Smith, J.
Subjak, J.
Twicken, J. D.
Udry, S.
Yahalomi, D. A.
Hoyer, S.
Gandolfi, D.
Armstrong, D. J.
Deleuil, M.
Acuna, L.
de Medeiros, J. R.
Goffo, E.
Lillo-Box, J.
Delgado Mena, E.
Lopez, T. A.
Santerne, A.
Sousa, S.
Fridlund, M.
Adibekyan, V
Collins, K. A.
Serrano, L. M.
Cortes-Zuleta, P.
Howell, S. B.
Deeg, H.
Aguichine, A.
Barragan, O.
Bryant, E. M.
Canto Martins, B. L.
Collins, K., I
Cooke, B. F.
Diaz, R. F.
Esposito, M.
Furlan, E.
Hojjatpanah, S.
Jackman, J.
Jenkins, J. M.
Jensen, E. L. N.
Latham, D. W.
Leao, I. C.
Matson, R. A.
Nielsen, L. D.
Osborn, A.
Otegi, J. F.
Rodler, F.
Sabotta, S.
Scott, N. J.
Seager, S.
Stockdale, C.
Strom, P. A.
Vanderspek, R.
Van Eylen, V.
Wheatley, P. J.
Winn, J. N.
Almenara, J. M.
Barrado, D.
Barros, S. C. C.
Bayliss, D.
Bouchy, F.
Boyd, P. T.
Cabrera, J.
Cochran, W. D.
Demangeon, O.
Doty, J. P.
Dumusque, X.
Figueira, P.
Fong, W.
Grziwa, S.
Hatzes, A. P.
Kabath, P.
Knudstrup, E.
Korth, J.
Livingston, J. H.
Luque, R.
Mousis, O.
Mullally, S. E.
Osborn, H. P.
Palle, E.
Persson, C. M.
Redfield, S.
Santos, N. C.
Smith, J.
Subjak, J.
Twicken, J. D.
Udry, S.
Yahalomi, D. A.
Publication Year :
2021

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 +/- 1.0M circle plus and radius of 3.03 +/- 0.15 R circle plus, 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 +/- 1.4Gyr) K dwarf star with a period of similar to 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.

Details

Database :
OAIster
Notes :
English
Publication Type :
Electronic Resource
Accession number :
edsoai.on1312208229
Document Type :
Electronic Resource

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