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NGTS-7Ab : an ultrashort-period brown dwarf transiting a tidally locked and active M dwarf

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Jackman, James A. G., Wheatley, Peter J., Bayliss, Daniel D. R., Gill, Samuel, Hodgkin, Simon T., Burleigh, Matthew R., Braker, Ian P., Günther, Maximilian N., Louden, Tom M., Turner, Oliver et al.
(2019) NGTS-7Ab : an ultrashort-period brown dwarf transiting a tidally locked and active M dwarf. Monthly Notices of the Royal Astronomical Society, 489 (4). pp. 5146-5164. doi:10.1093/mnras/stz2496 ISSN 0035-8711.

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Official URL: http://dx.doi.org/10.1093/mnras/stz2496

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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.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Brown dwarf stars , Low mass stars , Stars -- Rotation
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Wiley
ISSN: 0035-8711
Official Date: November 2019
Dates:
DateEvent
November 2019Available
11 September 2019Available
4 September 2019Accepted
Volume: 489
Number: 4
Page Range: pp. 5146-5164
DOI: 10.1093/mnras/stz2496
Status: Peer Reviewed
Publication Status: Published
Reuse Statement (publisher, data, author rights): This is a pre-copyedited, author-produced version of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record 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, NGTS-7Ab: an ultrashort-period brown dwarf transiting a tidally locked and active M dwarf, Monthly Notices of the Royal Astronomical Society, Volume 489, Issue 4, November 2019, Pages 5146–5164, is available online at: https://doi.org/10.1093/mnras/stz2496
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 13 January 2020
Date of first compliant Open Access: 15 January 2020
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIEDUniversity of Warwickhttp://dx.doi.org/10.13039/501100000741
UNSPECIFIEDUniversity of Leicesterhttp://dx.doi.org/10.13039/501100000738
UNSPECIFIEDQueen's Universityhttp://dx.doi.org/10.13039/501100003321
UNSPECIFIEDUniversité de GenèveUNSPECIFIED
Großinvestition GI-NGTSDeutsches Zentrum für Luft- und Raumfahrthttp://dx.doi.org/10.13039/501100002946
UNSPECIFIEDInstitute for Aviation and the Environment, University of Cambridgehttp://dx.doi.org/10.13039/501100004537
ST/M001962/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
ST/S002642/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
176309[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
ST/P000495/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
Ernest Rutherford fellowship[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
orres postdoctoral fellowKavli Institute for Theoretical Physics, University of California, Santa Barbarahttp://dx.doi.org/10.13039/100005956
1161218[FONDECYT] Fondo Nacional de Desarrollo Científico y Tecnológicohttp://dx.doi.org/10.13039/501100002850
CATA-Basal PB06[CONICYT] Comisión Nacional de Investigación Científica y Tecnológicahttp://dx.doi.org/10.13039/501100002848
ST/P000312/1[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
Winton Exoplanet FellowshipDavid And Claudia Harding Foundationhttps://beta.charitycommission.gov.uk/charity-details/?regid=1120878&subid=0

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