SIMBAD references

2024AJ....167..289H - Astron. J., 167, 289 (2024/June-0)

The Discovery and Follow-up of Four Transiting Short-period Sub-Neptunes Orbiting M Dwarfs.

HORI Y., FUKUI A., HIRANO T., NARITA N., DE LEON J.P., ISHIKAWA H.T., HARTMAN J.D., MORELLO G., ABREU GARCIA N., ALVAREZ-HERNANDEZ L., BEJAR V.J.S., CALATAYUD-BORRAS Y., CARLEO I., ENOC G., ESPARZA-BORGES E., FUKUDA I., GALAN D., GERALDIA-GONZALEZ S., HAYASHI Y., IKOMA M., IKUTA K., ISOGAI K., KAGETANI T., KAWAI Y., KAWAUCHI K., KIMURA T., KODAMA T., KORTH J., KUSAKABE N., LAZA-RAMOS A., LIVINGSTON J.H., LUQUE R., MIYAKAWA K., MORI M., MURGAS F., ORELL-MIQUEL J., PALLE E., PARVIAINEN H., PELAEZ-TORRES A., PUIG-SUBIRA M., SANCHEZ-BENAVENTE M., SOSA-GUILLEN P., STANGRET M., TERADA Y., MUNOZ TORRES S., WATANABE N., BAKOS G.A., BARKAOUI K., BEICHMAN C., BENKHALDOUN Z., BOYLE A.W., CIARDI D.R., CLARK C.A., COLLINS K.A., COLLINS K.I., CONTI D.M., CROSSFIELD I.J.M., EVERETT M.E., FURLAN E., GHACHOUI M., GILLON M., GONZALES E.J., HIGUERA J., HORNE K., HOWELL S.B., JEHIN E., LESTER K.V., LUND M.B., MATSON R., MATTHEWS E.C., POZUELOS F.J., SAFONOV B.S., SCHLIEDER J.E., SCHWARZ R.P., SEFAKO R., SRDOC G., STRAKHOV I.A., TIMMERMANS M., WAALKES W.C., ZIEGLER C., CHARBONNEAU D., ESSACK Z., GUERRERO N.M., HARAKAWA H., HEDGES C., ISHIZUKA M., JENKINS J.M., KONISHI M., KOTANI T., KUDO T., KUROKAWA T., KUZUHARA M., NISHIKAWA J., OMIYA M., RICKER G.R., SEAGER S., SERIZAWA T., STRIEGEL S., TAMURA M., UEDA A., VANDERSPEK R., VIEVARD S. and WINN J.N.

Abstract (from CDS):

Sub-Neptunes with radii of 2-3R_⊕ are intermediate in size between rocky planets and Neptune-sized planets. The orbital properties and bulk compositions of transiting sub-Neptunes provide clues to the formation and evolution of close-in small planets. In this paper, we present the discovery and follow-up of four sub-Neptunes orbiting M dwarfs (TOI-782, TOI-1448, TOI-2120, and TOI-2406), three of which were newly validated by ground-based follow-up observations and statistical analyses. TOI-782 b, TOI-1448 b, TOI-2120 b, and TOI-2406 b have radii of ${R}_{{\rm{p}}}={2.740}_{-0.079}^{+0.082}\,{R}_{\oplus }$ , ${2.769}_{-0.068}^{+0.073}\,{R}_{\oplus }$ , 2.120 ± 0.067 R_⊕, and ${2.830}_{-0.066}^{+0.068}\,{R}_{\oplus }$ and orbital periods of P = 8.02, 8.11, 5.80, and 3.08 days, respectively. Doppler monitoring with the Subaru/InfraRed Doppler instrument led to 2σ upper limits on the masses of <19.1 M_⊕, <19.5 M_⊕, <6.8 M_⊕, and <15.6 M_⊕ for TOI-782 b, TOI-1448 b, TOI-2120 b, and TOI-2406 b, respectively. The mass-radius relationship of these four sub-Neptunes testifies to the existence of volatile material in their interiors. These four sub-Neptunes, which are located above the so-called “radius valley,” are likely to retain a significant atmosphere and/or an icy mantle on the core, such as a water world. We find that at least three of the four sub-Neptunes (TOI-782 b, TOI-2120 b, and TOI-2406 b), orbiting M dwarfs older than 1 Gyr, are likely to have eccentricities of e ∼ 0.2-0.3. The fact that tidal circularization of their orbits is not achieved over 1 Gyr suggests inefficient tidal dissipation in their interiors.

Journal keyword(s): Exoplanets - Mini Neptunes - Radial velocity - Transit photometry - Tides - M dwarf stars

Simbad objects: 16

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