Universität zu Köln

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. and Yahalomi, D. A. (2021). TOI-220b: a warm sub-Neptune discovered by TESS. Mon. Not. Roy. Astron. Soc., 505 (3). S. 3361 - 3380. OXFORD: OXFORD UNIV PRESS. ISSN 1365-2966

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Abstract

In this paper, we report the discovery of TOI-220b, 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 +/- 0.15R(circle plus), implying a bulk density of 2.73 +/- 0.47. TOI-220b orbits a relative bright (V=10.4) and old (10.1 +/- 1.4Gyr) K dwarf star with a period of similar to 10.69d. Thus, TOI-220b is a new warm sub-Neptune with very precise mass and radius determinations. A Bayesian analysis of the TOI-220b 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
Creators:	Creators Email ORCID ORCID Put Code Hoyer, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gandolfi, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Armstrong, D. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Deleuil, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Acuna, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED de Medeiros, J. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Goffo, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lillo-Box, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Delgado Mena, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lopez, T. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Santerne, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sousa, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fridlund, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Adibekyan, V UNSPECIFIED UNSPECIFIED UNSPECIFIED Collins, K. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Serrano, L. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cortes-Zuleta, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Howell, S. B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Deeg, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Aguichine, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Barragan, O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bryant, E. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Canto Martins, B. L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Collins, K., I UNSPECIFIED UNSPECIFIED UNSPECIFIED Cooke, B. F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Diaz, R. F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Esposito, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Furlan, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hojjatpanah, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jackman, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jenkins, J. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jensen, E. L. N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Latham, D. W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Leao, I. C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Matson, R. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Nielsen, L. D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Osborn, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Otegi, J. F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rodler, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sabotta, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Scott, N. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Seager, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Stockdale, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Strom, P. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Vanderspek, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Van Eylen, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wheatley, P. J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Winn, J. N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Almenara, J. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Barrado, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Barros, S. C. C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bayliss, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bouchy, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Boyd, P. T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cabrera, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cochran, W. D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Demangeon, O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Doty, J. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Dumusque, X. UNSPECIFIED UNSPECIFIED UNSPECIFIED Figueira, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Fong, W. UNSPECIFIED UNSPECIFIED UNSPECIFIED Grziwa, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hatzes, A. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kabath, P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Knudstrup, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Korth, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Livingston, J. H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Luque, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mousis, O. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mullally, S. E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Osborn, H. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Palle, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Persson, C. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Redfield, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Santos, N. C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Smith, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Subjak, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Twicken, J. D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Udry, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Yahalomi, D. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-607864
DOI:	10.1093/mnras/stab1427
Journal or Publication Title:	Mon. Not. Roy. Astron. Soc.
Volume:	505
Number:	3
Page Range:	S. 3361 - 3380
Date:	2021
Publisher:	OXFORD UNIV PRESS
Place of Publication:	OXFORD
ISSN:	1365-2966
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language EXTRASOLAR PLANET VALIDATION; POWERED MASS-LOSS; RADIUS DISTRIBUTION; ERROR-CORRECTION; STARS; CORE; EXOPLANETS; VARIABILITY; PARAMETERS; VELOCITIES Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/60786