Persson, Carina M., Georgieva, Iskra Y., Gandolfi, Davide, Acuna, Lorena, Aguichine, Artem, Muresan, Alexandra, Guenther, Eike, Livingston, John, Collins, Karen A., Dai, Fei, Fridlund, Malcolm, Goffo, Elisa, Jenkins, James S., Kabath, Petr, Korth, Judith, Levine, Alan M., Serrano, Luisa M., Vines, Jose ORCID: 0000-0002-1896-2377, Barragan, Oscar, Carleo, Ilaria, Colon, Knicole D., Cochran, William D., Christiansen, Jessie L., Deeg, Hans J., Deleuil, Magali, Dragomir, Diana, Esposito, Massimiliamo, Gan, Tianjun ORCID: 0000-0002-4503-9705, Grziwa, Sascha, Hatzes, Artie P., Hesse, Katharine, Horne, Keith, Jenkins, Jon M., Kielkopf, John F., Klagyivik, P., Lam, Kristine W. F., Latham, David W., Luque, Rafa, Orell-Miquel, Jaume, Mortier, Annelies, Mousis, Olivier, Narita, Noria, Osborne, Hannah L. M., Palle, Enric, Papini, Riccardo, Ricker, George R., Schmerling, Hendrik, Seager, Sara, Stassun, Keivan G., Van Eylen, Vincent ORCID: 0000-0001-5542-8870, Vanderspek, Roland, Wang, Gavin, Winn, Joshua N., Wohler, Bill, Zambelli, Roberto and Ziegler, Carl (2022). TOI-2196 b: Rare planet in the hot Neptune desert transiting a G-type star. Astron. Astrophys., 666. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

The hot Neptune desert is a region hosting a small number of short-period Neptunes in the radius-instellation diagram. Highly irradiated planets are usually either small (R less than or similar to 2 R-circle plus) and rocky or they are gas giants with radii of greater than or similar to 1 R-J. Here, we report on the intermediate-sized planet TOI-2196 b (TIC 372172128.01) on a 1.2 day orbit around a G-type star (V = 12.0, [Fe/H] = 0.14 dex) discovered by the Transiting Exoplanet Survey Satellite in sector 27. We collected 41 radial velocity measurements with the HARPS spectrograph to confirm the planetary nature of the transit signal and to determine the mass. The radius of TOI-2196 b is 3.51 +/- 0.15 R-circle plus, which, combined with the mass of 26.0 +/- 1.3 M-circle plus, results in a bulk density of 3.31(-0.43)(+0.51) g cm(-3). Hence, the radius implies that this planet is a sub-Neptune, although the density is twice than that of Neptune. A significant trend in the HARPS radial velocity measurements points to the presence of a distant companion with a lower limit on the period and mass of 220 days and 0.65 M-J, respectively, assuming zero eccentricity. The short period of planet b implies a high equilibrium temperature of 1860 +/- 20 K, for zero albedo and isotropic emission. This places the planet in the hot Neptune desert, joining a group of very few planets in this parameter space discovered in recent years. These planets suggest that the hot Neptune desert may be divided in two parts for planets with equilibrium temperatures of greater than or similar to 1800 K: a hot sub-Neptune desert devoid of planets with radii of approximate to 1.8-3 R-circle plus and a sub-Jovian desert for radii of approximate to 5-12 R-circle plus. More planets in this parameter space are needed to further investigate this finding. Planetary interior structure models of TOI-2196 b are consistent with a H/He atmosphere mass fraction between 0.4% and 3%, with a mean value of 0.7% on top of a rocky interior. We estimated the amount of mass this planet might have lost at a young age and we find that while the mass loss could have been significant, the planet had not changed in terms of character: it was born as a small volatile-rich planet and it remains one at present.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Persson, Carina M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Georgieva, Iskra Y.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gandolfi, DavideUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Acuna, LorenaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Aguichine, ArtemUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Muresan, AlexandraUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Guenther, EikeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Livingston, JohnUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Collins, Karen A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dai, FeiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fridlund, MalcolmUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Goffo, ElisaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jenkins, James S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kabath, PetrUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Korth, JudithUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Levine, Alan M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Serrano, Luisa M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Vines, JoseUNSPECIFIEDorcid.org/0000-0002-1896-2377UNSPECIFIED
Barragan, OscarUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Carleo, IlariaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Colon, Knicole D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cochran, William D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Christiansen, Jessie L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Deeg, Hans J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Deleuil, MagaliUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dragomir, DianaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Esposito, MassimiliamoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gan, TianjunUNSPECIFIEDorcid.org/0000-0002-4503-9705UNSPECIFIED
Grziwa, SaschaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hatzes, Artie P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hesse, KatharineUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Horne, KeithUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jenkins, Jon M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kielkopf, John F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Klagyivik, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lam, Kristine W. F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Latham, David W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Luque, RafaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Orell-Miquel, JaumeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mortier, AnneliesUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mousis, OlivierUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Narita, NoriaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Osborne, Hannah L. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Palle, EnricUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Papini, RiccardoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ricker, George R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schmerling, HendrikUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Seager, SaraUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Stassun, Keivan G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Van Eylen, VincentUNSPECIFIEDorcid.org/0000-0001-5542-8870UNSPECIFIED
Vanderspek, RolandUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wang, GavinUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Winn, Joshua N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wohler, BillUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zambelli, RobertoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ziegler, CarlUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-698826
DOI: 10.1051/0004-6361/202244118
Journal or Publication Title: Astron. Astrophys.
Volume: 666
Date: 2022
Publisher: EDP SCIENCES S A
Place of Publication: LES ULIS CEDEX A
ISSN: 1432-0746
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
POWERED MASS-LOSS; RADIAL-VELOCITY; SUPER-EARTH; CLOSE PLANETS; DWARFS; YOUNG; CORE; PARAMETERS; EXOPLANETS; ATMOSPHEREMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/69882

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