SIMBAD references

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.

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

Simbad objects: 14

Full paper

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