期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 489, 期 4, 页码 5146-5164出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stz2496
关键词
brown dwarfs; stars: flare; stars: individual: NGTS-7A; stars: low-mass; stars: rotation
资金
- University of Warwick
- University of Leicester
- Queen's University Belfast
- University of Geneva
- Deutsches Zentrum fur Luft-und Raumfahrt e.V. (DLR
- under the 'Grossinvestition GINGTS')
- University of Cambridge
- UK Science and Technology Facilities Council (STFC) [ST/M001962/1, ST/S002642/1]
- STFC [176309, ST/P000495/1]
- STFC Ernest Rutherford fellowship
- MIT's Kavli Institute
- Fondecyt [1161218]
- CATA-Basal (PB06, CONICYT)
- Science and Technology Facilities Council [ST/P000312/1]
- David and Claudia Harding Foundation
- National Aeronautics and Space Administration
- National Science Foundation
- STFC [ST/P000495/1, ST/S000623/1, ST/P000312/1, 2025424, 1795021, ST/S002642/1, ST/R003726/1, ST/M002004/1, ST/M001962/1] Funding Source: UKRI
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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