2020AJ....160....3C

Query : 2020AJ....160....3C

2020AJ....160....3C - Astron. J., 160, 3-3 (2020/July-0)

A pair of TESS planets spanning the radius valley around the nearby mid-M dwarf LTT 3780.

CLOUTIER R., EASTMAN J.D., RODRIGUEZ J.E., ASTUDILLO-DEFRU N., BONFILS X., MORTIER A., WATSON C.A., STALPORT M., PINAMONTI M., LIENHARD F., HARUTYUNYAN A., DAMASSO M., LATHAM D.W., COLLINS K.A., MASSEY R., IRWIN J., WINTERS J.G., CHARBONNEAU D., ZIEGLER C., MATTHEWS E., CROSSFIELD I.J.M., KREIDBERG L., QUINN S.N., RICKER G., VANDERSPEK R., SEAGER S., WINN J., JENKINS J.M., VEZIE M., UDRY S., TWICKEN J.D., TENENBAUM P., SOZZETTI A., SEGRANSAN D., SCHLIEDER J.E., SASSELOV D., SANTOS N.C., RICE K., RACKHAM B.V., PORETTI E., PIOTTO G., PHILLIPS D., PEPE F., MOLINARI E., MIGNON L., MICELA G., MELO C., DE MEDEIROS J.R., MAYOR M., MATSON R.A., MARTINEZ FIORENZANO A.F., MANN A.W., MAGAZZU A., LOVIS C., LOPEZ-MORALES M., LOPEZ E., LISSAUER J.J., LEPINE S., LAW N., KIELKOPF J.F., JOHNSON J.A., JENSEN E.L.N., HOWELL S.B., GONZALES E., GHEDINA A., FORVEILLE T., FIGUEIRA P., DUMUSQUE X., DRESSING C.D., DOYON R., DIAZ R.F., DI FABRIZIO L., DELFOSSE X., COSENTINO R., CONTI D.M., COLLINS K.I., CAMERON A.C., CIARDI D., CALDWELL D.A., BURKE C., BUCHHAVE L., BRICENO C., BOYD P., BOUCHY F., BEICHMAN C., ARTIGAU E. and ALMENARA J.M.

Abstract (from CDS):

We present the confirmation of two new planets transiting the nearby mid-M dwarf LTT 3780 (TIC 36724087, TOI-732, V = 13.07, Ks = 8.204, Rs = 0.374 R☉, Ms = 0.401 M☉, d = 22 pc). The two planet candidates are identified in a single Transiting Exoplanet Survey Satellite sector and validated with reconnaissance spectroscopy, ground-based photometric follow-up, and high-resolution imaging. With measured orbital periods of Pb = 0.77, Pc = 12.25 days and sizes rp,b = 1.33 ± 0.07, rp,c = 2.30 ± 0.16 R⊕, the two planets span the radius valley in period-radius space around low-mass stars, thus making the system a laboratory to test competing theories of the emergence of the radius valley in that stellar mass regime. By combining 63 precise radial velocity measurements from the High Accuracy Radial velocity Planet Searcher (HARPS) and HARPS-N, we measure planet masses of mp,b=2.62–0.46+0.48 and mp,c=8.6–1.3+1.6M⊕, which indicates that LTT 3780b has a bulk composition consistent with being Earth-like, while LTT 3780c likely hosts an extended H/He envelope. We show that the recovered planetary masses are consistent with predictions from both photoevaporation and core-powered mass-loss models. The brightness and small size of LTT 3780, along with the measured planetary parameters, render LTT 3780b and c as accessible targets for atmospheric characterization of planets within the same planetary system and spanning the radius valley.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Radial velocity - M dwarf stars - Exoplanet systems - Transit photometry

VizieR on-line data: <Available at CDS (J/AJ/160/3): table2.dat>

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 - 2024 		#notes
1 G 268-38 PM* 00 44 59.3309137511 -15 16 17.542839990     14.150 13.801   M4.5V 145 0
2 NAME G 268-38c Pl 00 44 59.3309137511 -15 16 17.542839990           ~ 65 0
3 HD 15337c Pl 02 27 28.3781273256 -27 38 06.736755624           ~ 21 0
4 NAME BD-17 588Ab Pl 03 01 51.3936681048 -16 35 36.031178525           ~ 53 0
5 HD 21749b Pl 03 26 59.2226447548 -63 29 56.762928961           ~ 38 0
6 NAME L 231-32d Pl 04 33 39.7200127728 -51 57 22.435373160           ~ 37 0
7 L 231-32 PM* 04 33 39.7200127728 -51 57 22.435373160     12.617 12.147   M3.0V 53 0
8 TOI-700 PM* 06 28 23.2285331376 -65 34 45.520447908   14.524 13.076 12.659 10.70 M2V 51 0
9 TOI-700c Pl 06 28 23.2285331376 -65 34 45.520447908           ~ 13 0
10 L 98-59 PM* 08 18 07.6214406393 -68 18 46.805365587   13.22 11.685 11.294   M3V 93 0
11 NAME L 98-59 b Pl 08 18 07.6214406393 -68 18 46.805365587           ~ 39 0
12 NAME L 98-59 c Pl 08 18 07.6214406393 -68 18 46.805365587           ~ 49 0
13 NAME L 320-124b Pl 10 14 51.7786855411 -47 09 24.192778106           ~ 171 0
14 L 320-124 PM* 10 14 51.7786855411 -47 09 24.192778106       13.067   M4 129 0
15 NAME G 162-44c Pl 10 18 35.1372361341 -11 43 00.243355403           ~ 30 0
16 G 162-44 PM* 10 18 35.1372361341 -11 43 00.243355403   14.68 13.14 12.84   M4.0 57 0
17 NAME G 162-44b Pl 10 18 35.1372361341 -11 43 00.243355403           ~ 29 0
18 LP 729-55 PM* 10 18 36.2039009291 -11 43 02.197822384     16.43     M3.5Ve 11 0
19 K2-266e Pl 10 31 44.5056089208 +00 56 15.269139996           ~ 8 0
20 K2-266d Pl 10 31 44.5056089208 +00 56 15.269139996           ~ 10 0
21 NAME LP 791-18b Pl 11 02 45.9546199392 -16 24 22.288196376           ~ 16 0
22 LP 791-18 PM* 11 02 45.9546199392 -16 24 22.288196376           M6V 28 0
23 K2-3 PM* 11 29 20.3917077216 -01 27 17.281697868   13.52 12.17 11.88   M1V 75 0
24 K2-18 PM* 11 30 14.5177445592 +07 35 18.255348492   15.01 13.50 13.24   dM2.5 98 0
25 K2-18b Pl 11 30 14.5177445592 +07 35 18.255348492           ~ 168 0
26 HD 119130b Pl 13 41 30.3033490344 -09 56 45.879437004           ~ 16 0
27 K2-38c Pl 16 00 08.0580517944 -23 11 21.329133720           ~ 23 0
28 NAME Barnard's star BY* 17 57 48.4984700685 +04 41 36.113879676 12.497 11.24 9.511 8.298 6.741 M4V 817 2
29 Kepler-102e Pl 18 45 55.8559851072 +47 12 28.845259020           ~ 65 0
30 Kepler-96b Pl 19 48 16.7135669520 +40 31 30.523868868           ~ 47 0
31 NAME L 210-70b Pl 20 27 42.0813992356 -56 27 25.151894071           ~ 38 0
32 NAME L 119-213b Pl 22 41 58.1171811377 -69 10 08.320741850           ~ 107 0
33 TRAPPIST-1 LM* 23 06 29.3684948589 -05 02 29.037301866     18.798 16.466 14.024 M7.5e 1006 0
34 TRAPPIST-1b Pl 23 06 29.3684948589 -05 02 29.037301866           ~ 261 0
35 CD-60 8051b Pl 23 20 07.5245143451 -60 03 54.644648069           ~ 40 0

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