2022PASJ...74L...1F

Query : 2022PASJ...74L...1F

2022PASJ...74L...1F - Publ. Astron. Soc. Jap., 74, L1-L8 (2022/February-1)

TOI-2285b: A 1.7 Earth-radius planet near the habitable zone around a nearby M dwarf.

FUKUI A., KIMURA T., HIRANO T., NARITA N., KODAMA T., HORI Y., IKOMA M., PALLE E., MURGAS F., PARVIAINEN H., KAWAUCHI K., MORI M., ESPARZA-BORGES E., BIERYLA A., IRWIN J., SAFONOV B.S., STASSUN K.G., ALVAREZ-HERNANDEZ L., BEJAR V.J.S., CASASAYAS-BARRIS N., CHEN G., CROUZET N., DE LEON J.P., ISOGAI K., KAGETANI T., KLAGYIVIK P., KORTH J., KURITA S., KUSAKABE N., LIVINGSTON J., LUQUE R., MADRIGAL-AGUADO A., MORELLO G., NISHIUMI T., ORELL-MIQUEL J., OSHAGH M., SANCHEZ-BENAVENTE M., STANGRET M., TERADA Y., WATANABE N., ZOU Y., TAMURA M., KUROKAWA T., KUZUHARA M., NISHIKAWA J., OMIYA M., VIEVARD S., UEDA A., LATHAM D.W., QUINN S.N., STRAKHOV I.S., BELINSKI A.A., JENKINS J.M., RICKER G.R., SEAGER S., VANDERSPEK R., WINN J.N., CHARBONNEAU D., CIARDI D.R., COLLINS K.A., DOTY J.P., BACHELET E. and HARBECK D.

Abstract (from CDS):

We report the discovery of TOI-2285b, a sub-Neptune-sized planet transiting a nearby (42 pc) M dwarf with a period of 27.3 d. We identified the transit signal from the Transiting Exoplanet Survey Satellite photometric data, which we confirmed with ground-based photometric observations using the multiband imagers MuSCAT2 and MuSCAT3. Combining these data with other follow-up observations including high-resolution spectroscopy with the Tillinghast Reflector Echelle Spectrograph, high-resolution imaging with the SPeckle Polarimeter, and radial velocity (RV) measurements with the InfraRed Doppler instrument, we find that the planet has a radius of 1.74 ±0.08 R⊕, a mass of \lt 19.5 M⊕ (95% c.l.), and an insolation flux of 1.54 ± 0.14 times that of the Earth. Although the planet resides just outside the habitable zone for a rocky planet, if the planet harbors an H2O layer under a hydrogen-rich atmosphere, then liquid water could exist on the surface of the H2O layer depending on the planetary mass and water mass fraction. The bright host star in the near-infrared (Ks = 9.0) makes this planet an excellent target for further RV and atmospheric observations to improve our understanding of the composition, formation, and habitability of sub-Neptune-sized planets.

Abstract Copyright: © The Author(s) 2021. Published by Oxford University Press on behalf of the Astronomical Society of Japan.

Journal keyword(s): planets and satellites: detection - planets and satellites: individual (TOI-2285b) - planets and satellites: interiors - techniques: photometric - techniques: radial velocities

Simbad objects: 13

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Number of rows : 13
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME G 268-38b Pl 00 44 59.3309137511 -15 16 17.542839990           ~ 237 0
2 TOI-700c Pl 06 28 23.2285331376 -65 34 45.520447908           ~ 17 0
3 TOI-700d Pl 06 28 23.2285331376 -65 34 45.520447908           ~ 64 0
4 NAME G 162-44c Pl 10 18 35.1372361341 -11 43 00.243355403           ~ 50 0
5 NAME LP 791-18c Pl 11 02 45.9546199392 -16 24 22.288196376           ~ 25 0
6 K2-18b Pl 11 30 14.5177445592 +07 35 18.255348492           ~ 303 0
7 NAME PM J13119+6550c Pl 13 11 59.5600372848 +65 50 01.703045580           ~ 28 0
8 NAME Barnard's star BY* 17 57 48.4984700685 +04 41 36.113879676 12.497 11.24 9.511 8.298 6.741 M4V 907 2
9 TOI-2285 * 22 10 15.1412043116 +58 42 22.260087084   14.896 13.393 12.962   M2V 17 0
10 TOI-2285b Pl 22 10 15.1412043116 +58 42 22.260087084           ~ 13 0
11 TRAPPIST-1c Pl 23 06 29.3684948589 -05 02 29.037301866           ~ 282 0
12 TRAPPIST-1 LM* 23 06 29.3684948589 -05 02 29.037301866     18.798 16.466 14.024 M7.5e 1306 0
13 TRAPPIST-1f Pl 23 06 29.3684948589 -05 02 29.037301866           ~ 281 0

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