SIMBAD references

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

goto Full paper

goto View the references in ADS

To bookmark this query, right click on this link: simbad:2025ApJ...983L..36L and select 'bookmark this link' or equivalent in the popup menu