2025ApJ...983L..36L

Query : 2025ApJ...983L..36L

2025ApJ...983L..36L - Astrophys. J., 983, L36 (2025/April-3)

TOI-6324 b: An Earth-mass Ultra-short-period Planet Transiting a Nearby M Dwarf.

LEE R.A., DAI F., HOWARD A.W., HALVERSON S., GOMEZ BARRIENTOS J., GREKLEK-MCKEON M., KNUTSON H.A., FULTON B.J., STEFANSSON G., LUBIN J., ISAACSON H., BRINKMAN C.L., SAUNDERS N., HEY D., HUBER D., WEISS L.M., ROGERS L.A., VALENCIA D., PLOTNYKOV M., PARAGAS K., HU R., HAN T., PETIGURA E.A., RUBENZAHL R., CIARDI D.R., HOUSEHOLDER A., GILBERT G.J., ONG J.M.J., ZHANG J., LUHN J., HANDLEY L., BEARD C., GIACALONE S., HOLCOMB R., VAN ZANDT J., BAKER A.D., BRODHEIM M., BROWN M., CHARBONNEAU D., COLLINS K.A., CROSSFIELD I.J.M., DEICH W., DUMUSQUE X., GIBSON S.R., GILBERT E., HILL G.M., HOLDEN B., JENKINS J.M., KAYE S., LAHER R.R., LANCLOS K., LEVINE W.G., PAYNE J., POLANSKI A.S., O'MEARA J., RICKER G.R., RIDER K., ROBERTSON P., ROY A., SCHLIEDER J.E., SCHWAB C., SEAGER S., SHAUM A.P., SIRK M.M., STRIEGEL S., TESKE J., VALLIANT J., VANDERSPEK R., VASISHT G., WALAWENDER J., WANG S.X., WINN J.N., WISHNOW E. and YEH S.

Abstract (from CDS):

We report the confirmation of TOI-6324 b, an Earth-sized (1.059 ± 0.041 R⊕) ultra-short-period (USP) planet orbiting a nearby (∼20 pc) M dwarf. Using the newly commissioned Keck Planet Finder spectrograph, we have measured the mass of TOI-6324 b 1.17 ± 0.22 M⊕. Because of its extremely short orbit of just ∼6.7 hr, TOI-6324 b is intensely irradiated by its M dwarf host and is expected to be stripped of any thick H/He envelope. We were able to constrain its interior composition and found an iron-core mass fraction (CMF = 27% ± 37%) consistent with that of Earth (∼33%) and other confirmed USPs. TOI-6324 b is the closest to an Earth-sized USP confirmed to date. TOI-6324 b is a promising target for JWST phase-curve and secondary eclipse observations (emission spectroscopy metric = 25), which may reveal its surface mineralogy, day-night temperature contrast, and possible tidal deformation. From seven sectors of TESS data, we report a tentative detection of the optical phase-curve variation with an amplitude of 42 ± 28 ppm.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Exoplanet structure - Exoplanets - Radial velocity - Exoplanet astronomy

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

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 TOI-2445b Pl 02 53 15.8178350377 +00 03 08.779046896           ~ 13 0
2 NAME PM J04343+4302b Pl 04 34 22.4953034088 +43 02 14.692100424           ~ 45 0
3 * rho01 Cnc e Pl 08 52 35.8111044043 +28 19 50.954994470           ~ 682 1
4 CD-45 5378b Pl 09 44 29.8367689785 -45 46 35.427639685           ~ 86 0
5 TOI-561b Pl 09 52 44.5491687624 +06 12 58.920960204           ~ 61 0
6 NAME L 210-70b Pl 20 27 42.0813992356 -56 27 25.151894071           ~ 68 0
7 BD+44 3567b Pl 20 45 04.0992448490 +44 29 56.645139366           ~ 17 0
8 G 264-17 PM* 22 03 21.2556524269 +67 29 59.831194830   14.3   13.035   dM4.0 35 0
9 TOI-6324b Pl 22 03 21.2556524269 +67 29 59.831194830           ~ 3 0
10 WASP-47e Pl 22 04 48.7261549272 -12 01 07.998743676           ~ 98 0
11 NAME G 189-1b Pl 22 06 00.6662280633 +39 18 02.897475330           ~ 8 0
12 NAME L 119-213b Pl 22 41 58.1171811377 -69 10 08.320741850           ~ 146 0
13 K2-141b Pl 23 23 39.9709098120 -01 11 21.448681332           ~ 104 0

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