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arxiv: 2105.01944 · v1 · pith:26YT5RRPnew · submitted 2021-05-05 · 🌌 astro-ph.EP

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

S. Hoyer , D. Gandolfi , D.J. Armstrong , M. Deleuil , L. Acu\~na , J.R. de Medeiros , E. Goffo , J. Lillo-Box
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E. Delgado Mena T.A. Lopez A. Santerne S. Sousa M. Fridlund V. Adibekyan K.A. Collins L.M. Serrano P. Cort\'es-Zuleta S.B. Howell H. Deeg A. Aguichine O. Barrag\'an E.M. Bryant B.L. Canto Martins K.I. Collins B.F. Cooke R.F. D\'iaz M. Esposito E. Furlan S. Hojjatpanah J. Jackman J.M. Jenkins E.L.N. Jensen D. W. Latham I.C. Le\~ao R.A. Matson L.D. Nielsen A. Osborn J.F. Otegi F. Rodler S. Sabotta N.J. Scott S. Seager C. Stockdale P.A. Str{\o}m 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. Kab\'ath E. Knudstrup J. Korth J.H. Livingston R. Luque O. Mousis S.E. Mullally H.P. Osborn E. Pall\'e C.M. Persson S. Redfield N.C. Santos J. Smith J. \v{S}ubjak J.D. Twicken S. Udry D.A. Yahalomi
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classification 🌌 astro-ph.EP
keywords toi-220sub-neptunetessanalysisdensityearthmassradial
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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 $\pm$ 1.0 M$_{Earth}$ and radius of 3.03 $\pm$ 0.15 R$_{Earth}$, implying a bulk density of 2.73 $\pm$ 0.47 $\textrm{g cm}^{-3}$. TOI-220 $b$ orbits a relative bright (V=10.4) and old (10.1$\pm$1.4 Gyr) K dwarf star with a period of $\sim$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.

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