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NGTS-7Ab: An ultra-short period brown dwarf transiting a tidally-locked and active M dwarf

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arxiv 1906.08219 v2 pith:CULLFTBX submitted 2019-06-19 astro-ph.SR astro-ph.EP

James A. G. Jackman , Peter J. Wheatley , Dan Bayliss , Samuel Gill , Simon T. Hodgkin , Matthew R. Burleigh , Ian P. Braker , Maximilian N. Günther
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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
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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 arcseconds with very similar proper motion and systemic velocity, suggesting the NGTS-7 system is a hierarchical triple. 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.

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  1. On the Eccentricity Distribution and Tidal Evolution of Transiting Brown Dwarfs

    astro-ph.EP 2026-07 conditional novelty 6.0 of 10

    Short-period (P<16 d) transiting brown dwarfs are low-eccentricity while longer-period ones are more excited; assuming a shared primordial Beta distribution, tidal evolution constrains Q_BD ≈ 10^{7.1–8.1}.

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