2019MNRAS.489.5146J

Query : 2019MNRAS.489.5146J

2019MNRAS.489.5146J - Mon. Not. R. Astron. Soc., 489, 5146-5164 (2019/November-2)

NGTS-7Ab: an ultrashort-period brown dwarf transiting a tidally locked and active M dwarf.

JACKMAN J.A.G., WHEATLEY P.J., BAYLISS D., GILL S., HODGKIN S.T., BURLEIGH M.R., BRAKER I.P., GUNTHER M.N., LOUDEN T., TURNER O., ANDERSON D.R., BELARDI C., BOUCHY F., BRIEGAL J.T., BRYANT E.M., CABRERA J., CASEWELL S.L., CHAUSHEV A., COSTES J.C., CSIZMADIA S., EIGMULLER P., ERIKSON A., GANSICKE B.T., GILLEN E., GOAD M.R., JENKINS J.S., McCORMAC J., MOYANO M., NIELSEN L.D., POLLACCO D., POPPENHAEGER K., QUELOZ D., RAUER H., RAYNARD L., SMITH A.M.S., UDRY S., VINES J.I., WATSON C.A. and WEST R.G.

Abstract (from CDS):

We present the discovery of NGTS-7Ab, a high-mass brown dwarf transiting an M dwarf with a period of 16.2 h, discovered as part of the Next Generation Transit Survey (NGTS). This is the shortest period transiting brown dwarf around a main or pre-main sequence star to date. The M star host (NGTS-7A) has an age of roughly 55 Myr and is in a state of spin-orbit synchronization, which we attribute to tidal interaction with the brown dwarf acting to spin-up the star. The host star is magnetically active and shows multiple flares across the NGTS and follow-up light curves, which we use to probe the flare-star-spot phase relation. The host star also has an M star companion at a separation of 1.13 arcsec with very similar proper motion and systemic velocity, suggesting that the NGTS-7 system is a hierarchical triple. The combination of tidal synchronisation and magnetic braking is expected to drive on-going decay of the brown dwarf orbit, with a remaining lifetime of only 5-10 Myr.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): brown dwarfs - stars: flare - stars: individual: NGTS-7A - stars: low-mass - stars: rotation

Simbad objects: 14

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Number of rows : 14
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 CoRoT-15b BD? 06 28 27.8204 +06 11 10.477   17.012 15.997 15.807   ~ 49 1
2 V* YZ CMi PM* 07 44 40.1723046464 +03 33 08.875227574 13.761 12.831 11.225 9.958 8.263 M4.0Ve 957 0
3 V* CU Cnc SB* 08 31 37.5741841080 +19 23 39.398029332   12.83 11.809 11.592   M5Ve 237 0
4 Cl* NGC 2632 HSHJ 430 EB* 08 42 39.4398272616 +19 24 51.898641012           M3.9 58 1
5 LP 261-75 LM* 09 51 04.5755715720 +35 58 09.461810208   16.940 15.436 14.713   M4.5Ve 60 1
6 WASP-128b BD? 11 31 26.0933641458 -41 41 22.299023767           ~ 26 0
7 LP 563-38 EB* 15 46 04.3030642435 +04 41 30.066220912           M5.1 45 1
8 2MASS J16033922-1851294 Or* 16 03 39.2319975144 -18 51 29.400368220           M2.5e 43 0
9 G 205-57C BD? 19 10 14.284032 +46 57 24.10632           ~ 44 0
10 G 208-42 PM* 19 51 09.3205973189 +46 29 00.213809780   14.47   12.544   M4.0Ve 235 0
11 NGTS-7A * 23 30 05.2354214952 -38 58 11.470666584           ~ 13 0
12 NGTS-7Ab BD? 23 30 05.2358629579 -38 58 11.462828113           ~ 22 0
13 NGTS-7 ** 23 30 05.26248 -38 58 11.7012   17.091 15.502     ~ 4 0
14 NGTS-7B * 23 30 05.3237329776 -38 58 12.004702572           ~ 2 0

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