SIMBAD references

2020A&A...642A.173N - Astronomy and Astrophysics, volume 642A, 173-173 (2020/10-1)

The CARMENES search for exoplanets around M dwarfs. Two planets on opposite sides of the radius gap transiting the nearby M dwarf LTT 3780.

NOWAK G., LUQUE R., PARVIAINEN H., PALLE E., MOLAVERDIKHANI K., BEJAR V.J.S., LILLO-BOX J., RODRIGUEZ-LOPEZ C., CABALLERO J.A., ZECHMEISTER M., PASSEGGER V.M., CIFUENTES C., SCHWEITZER A., NARITA N., CALE B., ESPINOZA N., MURGAS F., HIDALGO D., ZAPATERO OSORIO M.R., POZUELOS F.J., ACEITUNO F.J., AMADO P.J., BARKAOUI K., BARRADO D., BAUER F.F., BENKHALDOUN Z., CALDWELL D.A., CASASAYAS BARRIS N., CHATURVEDI P., CHEN G., COLLINS K.A., COLLINS K.I., CORTES-CONTRERAS M., CROSSFIELD I.J.M., DE LEON J.P., DIEZ ALONSO E., DREIZLER S., EL MUFTI M., ESPARZA-BORGES E., ESSACK Z., FUKUI A., GAIDOS E., GILLON M., GONZALES E.J., GUERRA P., HATZES A., HENNING T., HERRERO E., HESSE K., HIRANO T., HOWELL S.B., JEFFERS S.V., JEHIN E., JENKINS J.M., KAMINSKI A., KEMMER J., KIELKOPF J.F., KOSSAKOWSKI D., KOTANI T., KURSTER M., LAFARGA M., LATHAM D.W., LAW N., LISSAUER J.J., LODIEU N., MADRIGAL-AGUADO A., MANN A.W., MASSEY B., MATSON R.A., MATTHEWS E., MONTANES-RODRIGUEZ P., MONTES D., MORALES J.C., MORI M., NAGEL E., OSHAGH M., PEDRAZ S., PLAVCHAN P., POLLACCO D., QUIRRENBACH A., REFFERT S., REINERS A., RIBAS I., RICKER G.R., ROSE M.E., SCHLECKER M., SCHLIEDER J.E., SEAGER S., STANGRET M., STOCK S., TAMURA M., TANNER A., TESKE J., TRIFONOV T., TWICKEN J.D., VANDERSPEK R., WATANABE D., WITTROCK J., ZIEGLER C. and ZOHRABI F.

Abstract (from CDS):

We present the discovery and characterisation of two transiting planets observed by the Transiting Exoplanet Survey Satellite (TESS) orbiting the nearby (d*≃22pc), bright (J≃9mag) M3.5 dwarf LTT 3780 (TOI-732). We confirm both planets and their association with LTT 3780 via ground-based photometry and determine their masses using precise radial velocities measured with the CARMENES spectrograph. Precise stellar parameters determined from CARMENES high-resolution spectra confirm that LTT 3780 is a mid-M dwarf with an effective temperature of Teff=3360±51K, a surface gravity of logg*=4.81±0.04 (cgs), and an iron abundance of [Fe/H]=0.09±0.16dex, with an inferred mass of M*=0.379±0.016M☉ and a radius of R*=0.382±0.012R☉. The ultra-short-period planet LTT 3780 b (Pb=0.77d) with a radius of 1.35–0.06+0.06R⊕, a mass of 2.34–0.23+0.24M⊕, and a bulk density of 5.24–0.81+0.94g/cm3 joins the population of Earth-size planets with rocky, terrestrial composition. The outer planet, LTT 3780 c, with an orbital period of 12.25d, radius of 2.42–0.10+0.10R⊕, mass of 6.29–0.61+0.63M⊕, and mean density of 2.45–0.37+0.44g/cm3 belongs to the population of dense sub-Neptunes. With the two planets located on opposite sides of the radius gap, this planetary system is anexcellent target for testing planetary formation, evolution, and atmospheric models. In particular, LTT 3780 c is an ideal object for atmospheric studies with the James Webb Space Telescope (JWST).

Abstract Copyright: © ESO 2020

Journal keyword(s): techniques: photometric - techniques: radial velocities - stars: individual: LTT 3780 - stars: late-type - planets and satellites: detection

Simbad objects: 35

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