SIMBAD references

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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