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19 April 2024

» arxiv » 1906.8219

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NGTS-7Ab: An ultra-short period brown dwarf transiting a tidally-locked and active M dwarf
James A. G. Jackman ; Peter J. Wheatley ; Dan Bayliss ; Samuel Gill ; Simon T. Hodgkin ; Matthew R. Burleigh ; Ian P. Braker ; Maximilian N. Günther ; Tom Louden ; Oliver Turner ; David R. Anderson ; Claudia Belardi ; François Bouchy ; Joshua T. Briegal ; Edward M. Bryant ; Juan Cabrera ; Sarah L. Casewell ; Alexander Chaushev ; Jean C. Costes ; Szilard Csizmadia ; Philipp Eigmüller ; Anders Erikson ; Boris T. Gänsicke ; Edward Gillen ; Michael R. Goad ; James S. Jenkins ; James McCormac ; Maximiliano Moyano ; Louise D. Nielsen ; Don Pollacco ; Katja Poppenhaeger ; Didier Queloz ; Heike Rauer ; Liam Raynard ; Alexis M. S. Smith ; Stéphane Udry ; Jose I. Vines ; Christopher A. Watson ; Richard G. West ;
Date:	Wed, 19 Jun 2019 16:50:54 GMT (1891kb,D)
Abstract:	We present the discovery of NGTS-7Ab, a high mass brown dwarf transiting an M dwarf with a period of 16.2 hours, 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 synchronisation, 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 lightcurves, which we use to probe the flare-starspot 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 the NGTS-7 system is a hierarchical triple. The wide stellar companion is likely to have driven the migration of the brown dwarf through the Kozai-Lidov mechanism. The combination of tidal synchronisation and magnetic braking is expected to drive ongoing decay of the brown dwarf orbit, with a remaining lifetime of only 5-10 Myr.
Source:	arXiv, 1906.8219
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