2024ApJ...967L..21K

Query : 2024ApJ...967L..21K

2024ApJ...967L..21K - Astrophys. J., 967, L21 (2024/June-1)

Gliese 12 b: A Temperate Earth-sized Planet at 12 pc Ideal for Atmospheric Transmission Spectroscopy.

KUZUHARA M., FUKUI A., LIVINGSTON J.H., CABALLERO J.A., DE LEON J.P., HIRANO T., KASAGI Y., MURGAS F., NARITA N., OMIYA M., ORELL-MIQUEL J., PALLE E., CHANGEAT Q., ESPARZA-BORGES E., HARAKAWA H., HELLIER C., HORI Y., IKUTA K., ISHIKAWA H.T., KODAMA T., KOTANI T., KUDO T., MORALES J.C., MORI M., NAGEL E., PARVIAINEN H., PERDELWITZ V., REINERS A., RIBAS I., SANZ-FORCADA J., SATO B., SCHWEITZER A., TABERNERO H.M., TAKARADA T., UYAMA T., WATANABE N., ZECHMEISTER M., ABREU GARCIA N., AOKI W., BEICHMAN C., BEJAR V.J.S., BRANDT T.D., CALATAYUD-BORRAS Y., CARLEO I., CHARBONNEAU D., COLLINS K.A., CURRIE T., DOTY J.P., DREIZLER S., FERNANDEZ-RODRIGUEZ G., FUKUDA I., GALAN D., GERALDIA-GONZALEZ S., GONZALEZ-RODRIGUEZ J., HAYASHI Y., HEDGES C., HENNING T., HODAPP K., IKOMA M., ISOGAI K., JACOBSON S., JANSON M., JENKINS J.M., KAGETANI T., KAMBE E., KAWAI Y., KAWAUCHI K., KOKUBO E., KONISHI M., KORTH J., KRISHNAMURTHY V., KUROKAWA T., KUSAKABE N., KWON J., LAZA-RAMOS A., LIBOTTE F., LUQUE R., MADRIGAL-AGUADO A., MATSUMOTO Y., MAWET D., McELWAIN M.W., MENI GALLARDO P.P., MORELLO G., MUNOZ TORRES S., NISHIKAWA J., NUGROHO S.K., OGIHARA M., PELAEZ-TORRES A., RAPETTI D., SANCHEZ-BENAVENTE M., SCHLECKER M., SEAGER S., SERABYN E., SERIZAWA T., STANGRET M., TAKAHASHI A., TENG H.-Y., TAMURA M., TERADA Y., UEDA A., USUDA T., VANDERSPEK R., VIEVARD S., WATANABE D., WINN J.N. and ZAPATERO OSORIO M.R.

Abstract (from CDS):

Recent discoveries of Earth-sized planets transiting nearby M dwarfs have made it possible to characterize the atmospheres of terrestrial planets via follow-up spectroscopic observations. However, the number of such planets receiving low insolation is still small, limiting our ability to understand the diversity of the atmospheric composition and climates of temperate terrestrial planets. We report the discovery of an Earth-sized planet transiting the nearby (12 pc) inactive M3.0 dwarf Gliese 12 (TOI-6251) with an orbital period (Porb) of 12.76 days. The planet, Gliese 12 b, was initially identified as a candidate with an ambiguous Porb from TESS data. We confirmed the transit signal and Porb using ground-based photometry with MuSCAT2 and MuSCAT3, and validated the planetary nature of the signal using high-resolution images from Gemini/NIRI and Keck/NIRC2 as well as radial velocity (RV) measurements from the InfraRed Doppler instrument on the Subaru 8.2 m telescope and from CARMENES on the CAHA 3.5 m telescope. X-ray observations with XMM-Newton showed the host star is inactive, with an X-ray-to-bolometric luminosity ratio of $\mathrm{log}{L}_{{\rm{X}}}/{L}_{\mathrm{bol}}\approx -5.7$. Joint analysis of the light curves and RV measurements revealed that Gliese 12 b has a radius of 0.96 ± 0.05 R⊕, a 3σ mass upper limit of 3.9 M⊕, and an equilibrium temperature of 315 ± 6 K assuming zero albedo. The transmission spectroscopy metric (TSM) value of Gliese 12 b is close to the TSM values of the TRAPPIST-1 planets, adding Gliese 12 b to the small list of potentially terrestrial, temperate planets amenable to atmospheric characterization with JWST.

Abstract Copyright: © 2024. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Exoplanet astronomy - Exoplanet atmospheres - Exoplanets - Extrasolar rocky planets - Space telescopes - Transit photometry - Radial velocity - Astronomy data modeling - High resolution spectroscopy

Simbad objects: 21

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Number of rows : 21
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 GJ 12 b Pl 00 15 49.2423147549 +13 33 22.316274483           ~ 11 0
2 G 32-5 PM* 00 15 49.2423147549 +13 33 22.316274483   14.0 12.600 12.296 10.04 M4V 86 0
3 NAME LP 890-9c Pl 04 16 31.1617564071 -28 18 52.954336524           ~ 23 0
4 LP 890-9 PM* 04 16 31.1617564071 -28 18 52.954336524     17.47     M6.0 25 0
5 TOI-700 PM* 06 28 23.2285331376 -65 34 45.520447908   14.524 13.076 12.659 10.70 M2V 84 0
6 TOI-700e Pl 06 28 23.2285331376 -65 34 45.520447908           ~ 20 0
7 TOI-700d Pl 06 28 23.2285331376 -65 34 45.520447908           ~ 64 0
8 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
9 LSPM J1902+7525 PM* 19 02 31.9305592512 +75 25 06.980154744   14.2   12.404   M2.5 29 0
10 NAME LSPM J1902+7525c Pl 19 02 31.9305592512 +75 25 06.980154744           ~ 10 0
11 * alf Aql dS* 19 50 46.99855 +08 52 05.9563 1.07 0.98 0.76 0.62 0.49 A7Vn 919 1
12 NAME L 210-70b Pl 20 27 42.0813992356 -56 27 25.151894071           ~ 68 0
13 NAME L 119-213b Pl 22 41 58.1171811377 -69 10 08.320741850           ~ 146 0
14 TRAPPIST-1h Pl 23 06 29.3684948589 -05 02 29.037301866           ~ 162 0
15 TRAPPIST-1 LM* 23 06 29.3684948589 -05 02 29.037301866     18.798 16.466 14.024 M7.5e 1306 0
16 TRAPPIST-1b Pl 23 06 29.3684948589 -05 02 29.037301866           ~ 380 0
17 TRAPPIST-1c Pl 23 06 29.3684948589 -05 02 29.037301866           ~ 282 0
18 TRAPPIST-1e Pl 23 06 29.3684948589 -05 02 29.037301866           ~ 384 0
19 TRAPPIST-1g Pl 23 06 29.3684948589 -05 02 29.037301866           ~ 237 0
20 TRAPPIST-1d Pl 23 06 29.3684948589 -05 02 29.037301866           ~ 263 0
21 TRAPPIST-1f Pl 23 06 29.3684948589 -05 02 29.037301866           ~ 281 0

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