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

S. Hoyer 1 D. Gandolfi 2 D. J. Armstrong 1 M. Deleuil 1 L. Acu Na J. R. De Medeiros E. Goffo J. Lillo-Box 3 E. Delgado Mena T. A. Lopez A. Santerne 1 S. Sousa 4 M. Fridlund 5 V. Adibekyan 6 K. A. Collins L. M. Serrano P. Cortés-Zuleta S. B. Howell H. Deeg 7 A. Aguichine 1 O. Barragán E. M. Bryant B. L. Canto Martins 8 K. I. Collins B. F. Cooke R. F. Diaz 9 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 10 A. Osborn J. F. Otegi F. Rodler S. Sabotta N. J. Scott S. Seager C. Stockdale P. A. Strøm R. Vanderspek 11 V. van Eylen P. J. Wheatley 12 J. N. Winn J. M. Almenara 13 D. Barrado 14 S. C. C. Barros 1 D. Bayliss 15 F. Bouchy 16 P. T. Boyd 17 J. Cabrera 18 W. D. Cochran O. Demangeon 19 J. P. Doty X. Dumusque 16 P. Figueira 20, 4 W. Fong S. Grziwa A. P. Hatzes 21 P. Kabáth 22 E. Knudstrup J. Korth J. H. Livingston R. Luque 23 O. Mousis 1 S. E. Mullally H. P. Osborn 1 E. Palle 24 C. M. Persson S. Redfield 25 N. C. Santos 6, 26 J. Smith J. Šubjak J. D. Twicken S. Udry 16 D. A. Yahalomi 
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.
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S. Hoyer, D. Gandolfi, D. J. Armstrong, M. Deleuil, L. Acu Na, et al.. TOI-220 b: a warm sub-Neptune discovered by TESS. MNRAS, 2021, 505 (3), pp.3361-3379. ⟨10.1093/mnras/stab1427⟩. ⟨hal-03577487⟩

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