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

Jackman, James A.G. and Wheatley, Peter J. and Bayliss, Dan and Gill, Samuel and Hodgkin, Simon T. and Burleigh, Matthew R. and Braker, Ian P. and Günther, Maximilian N. and Louden, Tom and Turner, Oliver and Anderson, David R. and Belardi, Claudia and Bouchy, Francois and Briegal, Joshua T. and Bryant, Edward M. and Cabrera Perez, Juan and Casewell, Sarah L. and Chaushev, Alexander and Costes, Jean C. and Csizmadia, Szilard and Eigmüller, Philipp and Erikson, Anders and Gänsicke, Boris T. and Gillen, Edward and Goad, Michael R. and Jenkins, James S. and McCormac, James and Moyano, Maximiliano and Nielsen, Louise D. and Pollacco, Don and Poppenhaeger, Katja and Queloz, Didier and Rauer, Heike and Raynard, Liam and Smith, Alexis and Udry, Stéphane and Vines, Jose I. and Watson, Christopher A. and West, Richard G. (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. Oxford University Press. DOI: 10.1093/mnras/stz2496 ISSN 0035-8711

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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 URL in elib:https://elib.dlr.de/131544/
Document Type:Article
Title:NGTS-7Ab: an ultrashort-period brown dwarf transiting a tidally locked and active M dwarf
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Jackman, James A.G.Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Wheatley, Peter J.Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Bayliss, DanDepartment of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Gill, SamuelDepartment of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Hodgkin, Simon T.Institute of Astronomy, University of Cambridge, Madingley Rise, Cambridge CB3 0HA, UKUNSPECIFIED
Burleigh, Matthew R.Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKUNSPECIFIED
Braker, Ian P.Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKUNSPECIFIED
Günther, Maximilian N.Astrophysics Group, Cavendish Laboratory, J. J. Thomson Avenue, Cambridge CB3 0HE, UK; Department of Physics, and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USAUNSPECIFIED
Louden, TomDepartment of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Turner, OliverGeneva Observatory, University of Geneva, Chemin des Mailettes 51, CH-1290 Versoix, SwitzerlandUNSPECIFIED
Anderson, David R.Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Belardi, ClaudiaDepartment of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKUNSPECIFIED
Bouchy, FrancoisGeneva Observatory, University of Geneva, Chemin des Mailettes 51, CH-1290 Versoix, SwitzerlandUNSPECIFIED
Briegal, Joshua T.Astrophysics Group, Cavendish Laboratory, J. J. Thomson Avenue, Cambridge CB3 0HE, UKUNSPECIFIED
Bryant, Edward M.Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Cabrera Perez, JuanJuan.Cabrera (at) dlr.dehttps://orcid.org/0000-0001-6653-5487
Casewell, Sarah L.Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKUNSPECIFIED
Chaushev, AlexanderCenter for Astronomy and Astrophysics, TU Berlin, Hardenbergstr 36, D-10623 Berlin, GermanyUNSPECIFIED
Costes, Jean C.Astrophysics Research Centre, Queen's University Belfast, 1 University Road, Belfast BT7 1NN, UKUNSPECIFIED
Csizmadia, Szilardszilard.csizmadia (at) dlr.deUNSPECIFIED
Eigmüller, PhilippPhilipp.Eigmueller (at) dlr.dehttps://orcid.org/0000-0003-4096-0594
Erikson, Andersanders.erikson (at) dlr.deUNSPECIFIED
Gänsicke, Boris T.Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Gillen, EdwardAstrophysics Group, Cavendish Laboratory, J. J. Thomson Avenue, Cambridge CB3 0HE, UKUNSPECIFIED
Goad, Michael R.Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKUNSPECIFIED
Jenkins, James S.Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile; Centro de Astrofísica y Tecnologías Afines (CATA), Casilla 36-D, Santiago, ChileUNSPECIFIED
McCormac, JamesDepartment of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Moyano, MaximilianoInstituto de Astronomía, Universidad Católica del Norte, Angamos 0610, 1270709 Antofagasta, ChileUNSPECIFIED
Nielsen, Louise D.Geneva Observatory, University of Geneva, Chemin des Mailettes 51, CH-1290 Versoix, SwitzerlandUNSPECIFIED
Pollacco, DonDepartment of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Poppenhaeger, KatjaAstrophysics Research Centre, Queen's University Belfast, 1 University Road, Belfast BT7 1NN, UK; Leibniz Institute for Astrophysics Potsdam (AIP), An der Sternwarte 16, D-14482 Potsdam, GermanyUNSPECIFIED
Queloz, DidierAstrophysics Group, Cavendish Laboratory, J. J. Thomson Avenue, Cambridge CB3 0HE, UKUNSPECIFIED
Rauer, Heikeheike.rauer (at) dlr.deUNSPECIFIED
Raynard, LiamDepartment of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UKUNSPECIFIED
Smith, AlexisAlexis.Smith (at) dlr.deUNSPECIFIED
Udry, StéphaneGeneva Observatory, University of Geneva, Chemin des Mailettes 51, CH-1290 Versoix, SwitzerlandUNSPECIFIED
Vines, Jose I.Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, ChileUNSPECIFIED
Watson, Christopher A.Astrophysics Research Centre, Queen's University Belfast, 1 University Road, Belfast BT7 1NN, UKUNSPECIFIED
West, Richard G.Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UKUNSPECIFIED
Date:November 2019
Journal or Publication Title:Monthly Notices of the Royal Astronomical Society
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:489
DOI :10.1093/mnras/stz2496
Page Range:pp. 5146-5164
Publisher:Oxford University Press
ISSN:0035-8711
Status:Published
Keywords:brown dwarfs, stars: flare, stars: individual: NGTS-7A, stars: low-mass, stars: rotation, Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Earth and Planetary Astrophysics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Project PLATO
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Extrasolar Planets and Atmospheres
Institute of Planetary Research > Leitungsbereich PF
Deposited By: Eigmüller, Dr. Philipp
Deposited On:02 Dec 2019 14:44
Last Modified:02 Dec 2019 14:44

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