2020A&A...642A.173N

Query : 2020A&A...642A.173N

2020A&A...642A.173N - Astronomy and Astrophysics, volume 642A173-173 (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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Number of rows : 35
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 HD 224936 * 00 01 55.2735110400 -37 13 47.822495808   8.13 7.06     K1III 20 0
2 HD 225213 PM* 00 05 24.4284351777 -37 21 26.507931505 11.074 10.022 8.562 7.589 6.432 M2V 229 0
3 HD 3167b Pl 00 34 57.5242131960 +04 22 53.284093032           ~ 86 0
4 HD 3167 PM* 00 34 57.5242131960 +04 22 53.284093032       8.4   K0V 128 0
5 HD 3167c Pl 00 34 57.5242131960 +04 22 53.284093032           ~ 82 0
6 NAME G 268-38b Pl 00 44 59.3309137511 -15 16 17.542839990           ~ 237 0
7 K2-106c Pl 00 52 19.1415736296 +10 47 40.906374828           ~ 24 0
8 K2-106 PM* 00 52 19.1415736296 +10 47 40.906374828   12.58 12.10     ~ 61 0
9 K2-106b Pl 00 52 19.1415736296 +10 47 40.906374828           ~ 67 0
10 HD 15337 PM* 02 27 28.3781273256 -27 38 06.736755624   9.95 9.09     K1V 122 0
11 HD 15337b Pl 02 27 28.3781273256 -27 38 06.736755624           ~ 38 0
12 HD 15337c Pl 02 27 28.3781273256 -27 38 06.736755624           ~ 30 0
13 Ross 436 PM* 09 25 23.8493237769 -07 20 00.976525627   13.4 12.66     K5 19 0
14 2MASS J10183398-1143258 * 10 18 33.9893975232 -11 43 25.901055480           ~ 3 0
15 G 162-44 PM* 10 18 35.1372361341 -11 43 00.243355403   14.68 13.14 12.84   M4.0 98 0
16 NAME G 162-44b Pl 10 18 35.1372361341 -11 43 00.243355403           ~ 44 0
17 NAME G 162-44c Pl 10 18 35.1372361341 -11 43 00.243355403           ~ 50 0
18 LP 729-55 PM* 10 18 36.2039009291 -11 43 02.197822384     16.43     M3.5Ve 15 0
19 K2-36c Pl 11 17 47.7835701912 +03 51 59.005811016           ~ 17 0
20 K2-36 * 11 17 47.7835701912 +03 51 59.005811016   12.57 11.73 11.48   K3 42 0
21 K2-36b Pl 11 17 47.7835701912 +03 51 59.005811016           ~ 24 0
22 G 122-49 PM* 11 50 57.7205259231 +48 22 38.561183125       12.95   M4.5V 176 0
23 HD 156384C PM* 17 18 58.8272997802 -34 59 48.612673382 12.96 11.79 10.22 10.05 8.82 M1.5V 249 1
24 Kepler-10b Pl 19 02 43.0613892904 +50 14 28.701617339           ~ 322 1
25 Kepler-10c Pl 19 02 43.0613892904 +50 14 28.701617339           ~ 135 1
26 K2-138d Pl 23 15 47.7686067840 -10 50 58.895461284           ~ 22 0
27 K2-138e Pl 23 15 47.7686067840 -10 50 58.895461284           ~ 22 0
28 K2-138b Pl 23 15 47.7686067840 -10 50 58.895461284           ~ 18 0
29 K2-138f Pl 23 15 47.7686067840 -10 50 58.895461284           ~ 22 0
30 K2-138c Pl 23 15 47.7686067840 -10 50 58.895461284           ~ 19 0
31 K2-138 * 23 15 47.7686067840 -10 50 58.895461284   13.01 12.21 12.12 11.40 ~ 75 0
32 BD-02 5958 PM* 23 27 04.8376907739 -01 17 10.582653030   11.57 10.10 10.09 8.89 K6V 110 0
33 BD-02 5958d Pl 23 27 04.8376907739 -01 17 10.582653030           ~ 82 0
34 BD-02 5958c Pl 23 27 04.8376907739 -01 17 10.582653030           ~ 35 0
35 BD-02 5958b Pl 23 27 04.8376907739 -01 17 10.582653030           ~ 78 0

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