ORCID Profile
0000-0003-1231-2194
Current Organisations
Queen's University Belfast
,
Leibniz-Institut für Astrophysik Potsdam
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Publisher: Oxford University Press (OUP)
Date: 07-05-2018
Publisher: Oxford University Press (OUP)
Date: 13-09-2018
Publisher: Oxford University Press (OUP)
Date: 03-11-2017
Publisher: Oxford University Press (OUP)
Date: 18-05-2018
Publisher: Oxford University Press (OUP)
Date: 12-2018
Publisher: Oxford University Press (OUP)
Date: 04-03-2017
DOI: 10.1093/MNRAS/STX565
Publisher: Oxford University Press (OUP)
Date: 20-09-2018
Publisher: American Astronomical Society
Date: 13-03-2014
Publisher: American Astronomical Society
Date: 14-10-2014
Publisher: Oxford University Press (OUP)
Date: 11-09-2019
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.
Location: United Kingdom of Great Britain and Northern Ireland
Location: United States of America
No related grants have been discovered for Katja Poppenhaeger.