2021A&A...645A..41L


Query : 2021A&A...645A..41L

2021A&A...645A..41L - Astronomy and Astrophysics, volume 645A, 41-41 (2021/1-1)

A planetary system with two transiting mini-Neptunes near the radius valley transition around the bright M dwarf TOI-776.

LUQUE R., SERRANO L.M., MOLAVERDIKHANI K., NIXON M.C., LIVINGSTON J.H., GUENTHER E.W., PALLE E., MADHUSUDHAN N., NOWAK G., KORTH J., COCHRAN W.D., HIRANO T., CHATURVEDI P., GOFFO E., ALBRECHT S., BARRAGAN O., BRICENO C., CABRERA J., CHARBONNEAU D., CLOUTIER R., COLLINS K.A., COLLINS K.I., COLON K.D., CROSSFIELD I.J.M., CSIZMADIA S., DAI F., DEEG H.J., ESPOSITO M., FRIDLUND M., GANDOLFI D., GEORGIEVA I., GLIDDEN A., GOEKE R.F., GRZIWA S., HATZES A.P., HENZE C.E., HOWELL S.B., IRWIN J., JENKINS J.M., JENSEN E.L.N., KABATH P., KIDWELL R.C., KIELKOPF J.F., KNUDSTRUP E., LAM K.W.F., LATHAM D.W., LISSAUER J.J., MANN A.W., MATTHEWS E.C., MIRELES I., NARITA N., PAEGERT M., PERSSON C.M., REDFIELD S., RICKER G.R., RODLER F., SCHLIEDER J.E., SCOTT N.J., SEAGER S., SUBJAK J., TAN T.G., TING E.B., VANDERSPEK R., VAN EYLEN V., WINN J.N. and ZIEGLER C.

Abstract (from CDS):

We report the discovery and characterization of two transiting planets around the bright M1 V star LP 961-53 (TOI-776, J=8.5mag, M=0.54±0.03M) detected during Sector 10 observations of the Transiting Exoplanet Survey Satellite (TESS). Combining the TESS photometry with HARPS radial velocities, as well as ground-based follow-up transit observations from the MEarth and LCOGT telescopes, for the inner planet, TOI-776 b, we measured a period of Pb=8.25d, a radius of Rb=1.85±0.13R, and a mass of Mb=4.0±0.9M; and for the outer planet, TOI-776 c, a period of Pc=15.66d, a radius of Rc=2.02±0.14R, and a mass of Mc=5.3±1.8M. The Doppler data shows one additional signal, with a period of ∼34d, associated with the rotational period of the star. The analysis of fifteen years of ground-based photometric monitoring data and the inspection of different spectral line indicators confirm this assumption. The bulk densities of TOI-776 b and c allow for a wide range of possible interior and atmospheric compositions. However, both planets have retained a significant atmosphere, with slightly different envelope mass fractions. Thanks to their location near the radius gap for M dwarfs, we can start to explore the mechanism(s) responsible for the radius valley emergence around low-mass stars as compared to solar-like stars. While a larger sample of well-characterized planets in this parameter space is still needed to draw firm conclusions, we tentatively estimate that the stellar mass below which thermally-driven mass loss is no longer the main formation pathway for sculpting the radius valley is between 0.63 and 0.54M. Due to the brightness of the star, the TOI-776 system is also an excellent target for the James Webb Space Telescope, providing a remarkable laboratory in which to break the degeneracy in planetary interior models and to test formation and evolution theories of small planets around low-mass stars.

Abstract Copyright: © ESO 2021

Journal keyword(s): planetary systems - techniques: photometric - techniques: radial velocities - stars: individual: LP 961-53 - stars: low-mass

Simbad objects: 52

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Number of rows : 52
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 G 268-38 PM* 00 44 59.3314993038 -15 16 17.543124886     14.150 13.801   M4.5 92 0
2 NAME G 268-38b Pl 00 44 59.3314993038 -15 16 17.543124886           ~ 103 0
3 NAME G 268-38c Pl 00 44 59.3314993038 -15 16 17.543124886           ~ 30 0
4 NAME BD-17 588Ab Pl 03 01 51.3928134240 -16 35 36.022281226           ~ 16 0
5 Cl Melotte 20 OpC 03 26 42 +48 48.0           ~ 778 0
6 HD 21749b Pl 03 26 59.2228715011 -63 29 56.761818941           ~ 21 0
7 K2-83 LM* 03 59 36.3741446663 +15 33 31.969065895           M1V 9 0
8 HG 8-15 PM* 04 21 52.4847989858 +21 21 12.937622502   14.07   12.46   K6V 17 0
9 LP 358-499 PM* 04 40 35.6389148796 +25 00 36.047186428   15.63   13.4   M2V 11 0
10 * pi. Men c Pl 05 37 09.8851202601 -80 28 08.831347245           ~ 47 0
11 L 98-59 PM* 08 18 07.6215096918 -68 18 46.799548510   13.22 11.685 11.294   M3V 32 0
12 K2-146 LM* 08 40 06.4242175742 +19 05 34.429575829   17.87 16.25 15.97   M3.0V 19 0
13 K2-146b Pl 08 40 06.4242175742 +19 05 34.429575829           ~ 13 0
14 K2-264 * 08 45 26.0461681388 +19 41 54.446282894   18.33 16.41     M1.6 15 0
15 * rho01 Cnc c Pl 08 52 35.8113282132 +28 19 50.956901366           ~ 129 1
16 NAME L 678-39b Pl 09 36 01.6372518187 -21 39 38.878281901           ~ 24 0
17 LSPM J1008+6916 PM* 10 08 51.8069671684 +69 16 35.564173019       11.065   M0.5Ve 15 0
18 LSPM J1008+6916b Pl 10 08 51.8069671684 +69 16 35.564173019           ~ 5 0
19 NAME L 320-124b Pl 10 14 51.7783473599 -47 09 24.189733387           ~ 105 0
20 NAME G 162-44c Pl 10 18 35.1370942089 -11 43 00.241585751           ~ 5 0
21 NAME G 162-44b Pl 10 18 35.1370942089 -11 43 00.241585751           ~ 7 0
22 G 162-44 PM* 10 18 35.1370942089 -11 43 00.241585751   14.68 13.14 12.84   M4.0 22 0
23 HD 97658b Pl 11 14 33.1613362847 +25 42 37.391912066           ~ 148 1
24 K2-3 PM* 11 29 20.3917940095 -01 27 17.279810476   13.52 12.17 11.88   M1V 54 0
25 LP 961-53 PM* 11 54 18.3919845021 -37 33 09.836167021     11.536 11.104   M1 9 0
26 TOI-776c Pl? 11 54 18.3919845021 -37 33 09.836167021           ~ 1 0
27 TOI-776b Pl? 11 54 18.3919845021 -37 33 09.836167021           ~ 1 0
28 UCAC4 780-025091 PM* 13 11 59.5602440384 +65 50 01.703495265     12.951 12.582   M3 6 0
29 EPIC 249801827 PM* 15 11 23.9073933835 -17 52 30.796117443           M0-5V 4 0
30 NAME G 139-21b Pl 17 15 18.9337265994 +04 57 50.064695682           ~ 581 1
31 Kepler-303 PM* 18 52 32.5103311343 +43 39 25.323158167           M0V 33 0
32 Kepler-236 Ro* 18 55 27.9303913206 +39 53 53.158939928           M1V 40 0
33 Kepler-26 Ro* 18 59 45.8407041655 +46 33 59.438034099           M0V 74 1
34 Kepler-296 ** 19 06 09.572976 +49 26 14.54424           M2V 71 0
35 Kepler-138b Pl 19 21 31.5681629849 +43 17 34.680374646           ~ 44 0
36 Kepler-138 Ro* 19 21 31.5681629849 +43 17 34.680374646           M1V 88 0
37 Kepler-225 Ro* 19 28 46.5622784931 +47 27 25.564017420           M1V 33 0
38 Kepler-327 Ro* 19 30 34.1673836936 +44 05 15.561997725           M1V 44 0
39 Kepler-369 Ro* 19 34 41.8097547028 +47 54 30.287927754           M1V 31 0
40 Kepler-231 Ro* 19 35 53.6057119975 +50 31 54.841343679           M1V 38 0
41 Kepler-353 Ro* 19 47 25.5847453318 +41 45 29.419763940           M1V 31 0
42 Kepler-249 Ro* 19 47 56.4241559408 +43 39 30.703840898           M2V 46 0
43 Kepler-125 Ro* 19 53 01.9454146165 +47 36 17.846522331           M1V 46 0
44 Kepler-186 Ro* 19 54 36.6536205214 +43 57 18.025893926           M1V 104 0
45 NAME L 210-70b Pl 20 27 42.0813988928 -56 27 25.156653917           ~ 5 0
46 HD 204961 PM* 21 33 33.9749932664 -49 00 32.403471949 11.359 10.176 8.672 7.665 6.479 M2/3V 227 1
47 TRAPPIST-1b Pl 23 06 29.3684052886 -05 02 29.031690445           ~ 149 0
48 TRAPPIST-1c Pl 23 06 29.3684052886 -05 02 29.031690445           ~ 119 0
49 TRAPPIST-1g Pl 23 06 29.3684052886 -05 02 29.031690445           ~ 129 0
50 TRAPPIST-1f Pl 23 06 29.3684052886 -05 02 29.031690445           ~ 143 0
51 TRAPPIST-1d Pl 23 06 29.3684052886 -05 02 29.031690445           ~ 141 0
52 TRAPPIST-1e Pl 23 06 29.3684052886 -05 02 29.031690445           ~ 167 0

    Equat.    Gal    SGal    Ecl

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2021.07.28-18:31:21

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