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Jackman, James A G; Wheatley, Peter J; Bayliss, Dan; Gill, Samuel; Hodgkin, Simon T; Burleigh, Matthew R; Braker, Ian P; Günther, Maximilian N; Louden, Tom; Turner, Oliver; Anderson, David R; Belardi, Claudia; Bouchy, François; Briegal, Joshua T; Bryant, Edward M; Cabrera, Juan; Casewell, Sarah L; Chaushev, Alexander; Costes, Jean C; Csizmadia, Szilard; Eigmüller, Philipp; Erikson, Anders; Gänsicke, Boris T; Gillen, Edward; Goad, Michael R; Jenkins, James S; McCormac, James; Moyano, Maximiliano; Nielsen, Louise D; Pollacco, Don; Poppenhaeger, Katja; Queloz, Didier; Rauer, Heike; Raynard, Liam; Smith, Alexis M S; Udry, Stéphane; Vines, Jose I; Watson, Christopher A; West, Richard G
Monthly notices of the Royal Astronomical Society, 11/2019, Letnik: 489, Številka: 4Journal Article
ABSTRACT 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.
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