2021MNRAS.505.2741A


Query : 2021MNRAS.505.2741A

2021MNRAS.505.2741A - Mon. Not. R. Astron. Soc., 505, 2741-2752 (2021/August-1)

NGTS-19b: a high-mass transiting brown dwarf in a 17-d eccentric orbit.

ACTON J.S., GOAD M.R., BURLEIGH M.R., CASEWELL S.L., BREYTENBACH H., NIELSEN L.D., SMITH G., ANDERSON D.R., BATTLEY M.P., BAYLISS D., BOUCHY F., BRYANT E.M., CSIZMADIA S., EIGMULLER P., GILL S., GILLEN E., GRIEVES N., GUNTHER M.N., HENDERSON B.A., HODGKIN S.T., JACKMAN J.A.G., JENKINS J.S., LENDL M., McCORMAC J., MOYANO M., NELSON R.P., SEFAKO R.R., SMITH A.M.S., STALPORT M., THOMAS J.K., TILBROOK R.H., UDRY S., WEST R.G., WHEATLEY P.J., WORTERS H.L., VINES J.I. and ALVES D.R.

Abstract (from CDS):

We present the discovery of NGTS-19b, a high-mass transiting brown dwarf discovered by the Next Generation Transit Survey. We investigate the system using follow-up photometry from the South African Astronomical Observatory, as well as sector 11 Transiting Exoplanet Survey Satellite data, in combination with radial velocity measurements from the CORALIE spectrograph to precisely characterize the system. We find that NGTS-19b is a brown dwarf companion to a K-star, with a mass of 69.5 +5.7–5.4MJup and radius of 1.034 +0.055–0.053RJup. The system has a reasonably long period of 17.84 d, and a high degree of eccentricity of 0.3767 +0.0061–0.0061. The mass and radius of the brown dwarf imply an age of 0.46 +0.26–0.15 Gyr, however, this is inconsistent with the age determined from the host star spectral energy distribution, suggesting that the brown dwarf may be inflated. This is unusual given that its large mass and relatively low levels of irradiation would make it much harder to inflate. NGTS-19b adds to the small, but growing number of brown dwarfs transiting main-sequence stars, and is a valuable addition as we begin to populate the so-called brown dwarf desert.

Abstract Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): techniques: photometric - techniques: radial velocities - brown dwarfs

Simbad objects: 10

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Number of rows : 10
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 LP 768-15 PM* 01 31 04.0316748648 -14 53 12.918352308     15.74     ~ 3 0
2 NAME 2M 0535-05 a Pl? 05 35 21.8463185314 -05 46 08.560286991           ~ 6 0
3 TOI-811b BD? 05 52 07.2569953541 -32 55 30.663337365           ~ 9 0
4 CoRoT-15b BD? 06 28 27.8204 +06 11 10.477   17.012 15.997 15.807   ~ 43 1
5 NGTS-19 * 15 16 31.5959069782 -25 42 17.824831139   15.205 14.133 13.921   ~ 1 0
6 NGTS-19B BD? 15 16 31.5959069782 -25 42 17.824831139           ~ 3 1
7 UGCS J160339.22-185129.4 EB* 16 03 39.2319975144 -18 51 29.400368220           M2.5e 23 0
8 CoRoT-33b Pl? 18 38 33.9101911792 +05 37 28.787049157           ~ 19 0
9 KOI-415b Pl? 19 33 13.4495838492 +41 36 22.965658614           ~ 37 0
10 NGTS-7Ab BD? 23 30 05.2358629579 -38 58 11.462828113           ~ 15 0

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2022.11.26-10:38:40

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