2022A&A...666A...4K


Query : 2022A&A...666A...4K

2022A&A...666A...4K - Astronomy and Astrophysics, volume 666A, 4 (2022/10-1)

Validation and atmospheric exploration of the sub-Neptune TOI-2136b around a nearby M3 dwarf.

KAWAUCHI K., MURGAS F., PALLE E., NARITA N., FUKUI A., HIRANO T., PARVIAINEN H., ISHIKAWA H.T., WATANABE N., ESPARZA-BORGES E., KUZUHARA M., ORELL-MIQUEL J., KRISHNAMURTHY V., MORI M., KAGETANI T., ZOU Y., ISOGAI K., LIVINGSTON J.H., HOWELL S.B., CROUZET N., DE LEON J.P., KIMURA T., KODAMA T., KORTH J., KURITA S., LAZA-RAMOS A., LUQUE R., MADRIGAL-AGUADO A., MIYAKAWA K., MORELLO G., NISHIUMI T., RODRIGUEZ G.E.F., SANCHEZ-BENAVENTE M., STANGRET M., TENG H., TERADA Y., GNILKA C.L., GUERRERO N., HARAKAWA H., HODAPP K., HORI Y., IKOMA M., JACOBSON S., KONISHI M., KOTANI T., KUDO T., KUROKOWA T., KUSAKABE N., NISHIKAWA J., OMIYA M., SERIZAWA T., TAMURA M., UEDA A. and VIEVARD S.

Abstract (from CDS):


Context. The NASA space telescope TESS is currently in the extended mission of its all-sky search for new transiting planets. Of the thousands of candidates that TESS is expected to deliver, transiting planets orbiting nearby M dwarfs are particularly interesting targets since they provide a great opportunity to characterize their atmospheres by transmission spectroscopy.
Aims. We aim to validate and characterize the new sub-Neptune-sized planet candidate TOI-2136.01 orbiting a nearby M dwarf (d = 33.36 ± 0.02pc, Teff = 3373 ± 108 K) with an orbital period of 7.852 days.
Methods. We use TESS data, ground-based multicolor photometry, and radial velocity measurements with the InfraRed Doppler (IRD) instrument on the Subaru Telescope to validate the planetary nature of TOI-2136.01, and estimate the stellar and planetary parameters. We also conduct high-resolution transmission spectroscopy to search for helium in its atmosphere.
Results. We confirm that TOI-2136.01 (now named TOI-2136b) is a bona fide planet with a planetary radius of Rp = 2.20 ± 0.07R and a mass of Mp = 4.7–2.6+3.1M. We also search for helium 10830 Å absorption lines and place an upper limit on the equivalent width of <7.8 mÅ and on the absorption signal of <1.44% with 95% confidence.
Conclusions. TOI-2136b is a sub-Neptune transiting a nearby and bright star (J = 10.8 mag), and is a potentially hycean planet, which is a new class of habitable planets with large oceans under a H2-rich atmosphere, making it an excellent target for atmospheric studies to understand the formation, evolution, and habitability of the small planets.

Abstract Copyright: © K. Kawauchi et al. 2022

Journal keyword(s): planets and satellites: individual: TOI-2136b - planets and satellites: detection - planets and satellites: atmospheres - techniques: photometric - techniques: radial velocities

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 HAT-P-32b Pl 02 04 10.2774374568 +46 41 16.212315084           ~ 158 1
2 NAME L 231-32d Pl 04 33 39.7200127728 -51 57 22.435373160           ~ 36 0
3 NAME LP 424-4b Pl 07 59 05.8395356736 +15 23 29.236065000           ~ 302 1
4 HD 73583b Pl 08 38 45.2603894280 -13 15 24.092462772           ~ 30 0
5 NAME G 162-44c Pl 10 18 35.1372361341 -11 43 00.243355403           ~ 29 0
6 NAME LP 961-53c Pl 11 54 18.3921193416 -37 33 09.837719244           ~ 16 0
7 NAME G 139-21b Pl 17 15 18.9339850845 +04 57 50.066612336           ~ 722 1
8 TOI-2136.01 Pl 18 44 42.3658884696 +36 33 44.530295652           ~ 10 0
9 LSPM J1844+3633 PM* 18 44 42.3658884696 +36 33 44.530295652   15.1   13.4   ~ 16 0

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