2025MNRAS.544.2637B

Query : 2025MNRAS.544.2637B

2025MNRAS.544.2637B - Mon. Not. R. Astron. Soc., 544, 2637-2652 (2025/December-1)

TOI-7166 b: a habitable zone mini-Neptune planet around a nearby low-mass star.

BARKAOUI K., POZUELOS F.J., RACKHAM B.V., BURGASSER A.J., TRIAUD A.H.M.J., SERRA-RICART M., TIMMERMANS M., YALCINKAYA S., SOUBKIOU A., STASSUN K.G., COLLINS K.A., AMADO P.J., BASTURK O., BURDANOV A., DAVIS Y.T., DE WIT J., DEMORY B.-O., DEVENY S., DRANSFIELD G., DUCROT E., GILLON M., GOMEZ MAQUEO CHEW Y., HOOTON M.J., HORNE K., HOWELL S.B., JANO MUNOZ C., JEHIN E., JENKINS J.M., LITTLEFIELD C., MARTIN E.L., NIRAULA P., PEDERSEN P.P., QUELOZ D., SCOTT M.G., SEFAKO R., SHPORER A., STOCKDALE C., SOFTICH E., SOTA A., TOFFLEMIRE B., SIMSIR O., VARAS R., ZONG LANG F. and ZUNIGA-FERNANDEZ S.S.

Abstract (from CDS):

We present the discovery and validation of TOI-7166 b, a $2.01 \pm 0.05\,\mathrm{ R}_{\oplus }$ planet orbiting a nearby low-mass star. We validated the planet by combining Transiting Exoplanet Survey Satellite and multicolour high-precision photometric observations from ground-based telescopes, together with spectroscopic data, high-contrast imaging, archival images, and statistical arguments. The host star is an M4-type dwarf at a distance of $\sim$35 pc from the Sun. It has a mass and a radius of $M_\star = 0.190 \pm 0.004\, \mathrm{ M}_\odot$ and $R_\star =0.222 \pm 0.005\, \mathrm{ R}_\odot$, respectively. TOI-7166 b has an orbital period of 12.9 d, which places it close to the inner edge of the Habitable Zone of its host star, receiving an insolation flux of $S_\mathrm{ p}=1.07\pm 0.08\, \mathrm{ S}_{\oplus }$ and an equilibrium temperature of $T_{\rm eq}~= 249\pm 5$ K (assuming a null Bond albedo). The brightness of the host star makes TOI-7166 a suitable target for radial velocity follow-up to measure the planetary mass and bulk density. Moreover, the physical parameters of the system including the infrared brightness ($K_{\rm mag} = 10.6$) of the star and the planet-to-star radius ratio ($0.0823 \pm 0.0012$) make TOI-7166 b an exquisite target for transmission spectroscopic observations with the James Webb Space Telescope, to constrain the exoplanet atmospheric compositions.

Abstract Copyright: © The Author(s) 2025. Published by Oxford University Press on behalf of Royal Astronomical Society.

Journal keyword(s): exoplanets - planets and satellites: detection - stars: individual - stars: late-type - stars: low-mass

Simbad objects: 15

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Number of rows : 15
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 UCAC4 847-001114 * 00 49 46.7053042431 +79 17 16.427713246   13.836 12.809 12.532   ~ 1 0
3 NAME LP 890-9c Pl 04 16 31.1617564071 -28 18 52.954336524           ~ 23 0
4 NAME L 231-32d Pl 04 33 39.7200127728 -51 57 22.435373160           ~ 128 0
5 Ross 47 BY* 05 42 09.2676872099 +12 29 21.604835564 14.264 13.130 11.509 10.298 8.709 M4V 304 0
6 NAME LP 424-4b Pl 07 59 05.8395356736 +15 23 29.236065000           ~ 387 1
7 NAME L 98-59 d Pl 08 18 07.6214406393 -68 18 46.805365587           ~ 98 0
8 K2-18b Pl 11 30 14.5177445592 +07 35 18.255348492           ~ 303 0
9 TOI-2015 PM* 15 28 31.9021082967 +27 21 38.873849132   17.134   15.161   M4 12 0
10 NAME G 139-21b Pl 17 15 18.9339850845 +04 57 50.066612336           ~ 845 1
11 HD 192538 * 20 14 04.8813535248 +36 36 17.578013580   6.448 6.464     A0V 76 0
12 LDN 936 DNe 20 51.7 +45 11           ~ 7 0
13 LP 577-37 PM* 21 22 43.0805693707 +08 53 26.025602565   16.8   14.6   ~ 8 0
14 TOI-7166.01 Pl? 21 22 43.0805693707 +08 53 26.025602565           ~ 1 0
15 HD 211476 PM* 22 17 15.1410212093 +12 53 54.566432145   7.64   6.7   G2 110 0

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