Space and Planetary Science; Astronomy and Astrophysics
Abstract :
[en] ABSTRACT
We report the discovery of a brown dwarf orbiting a M1 host star. We first identified the brown dwarf within the Next Generation Transit Survey data, with supporting observations found in TESS sectors 11 and 38. We confirmed the discovery with follow-up photometry from the South African Astronomical Observatory, SPECULOOS-S, and TRAPPIST-S, and radial velocity measurements from HARPS, which allowed us to characterize the system. We find an orbital period of ∼1.25 d, a mass of $69.0^{+5.3}_{-4.8}$ MJ, close to the hydrogen burning limit, and a radius of 0.95 ± 0.05 RJ. We determine the age to be >0.5 Gyr, using model isochrones, which is found to be in agreement with spectral energy distribution fitting within errors. NGTS-28Ab is one of the shortest period systems found within the brown dwarf desert, as well as one of the highest mass brown dwarfs that transits an M dwarf. This makes NGTS-28Ab another important discovery within this scarcely populated region.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Henderson, Beth A ; School of Physics and Astronomy, University of Leicester , University Road , Leicester LE1 7RH, UK
Casewell, Sarah L; School of Physics and Astronomy, University of Leicester , University Road , Leicester LE1 7RH, UK
Goad, Michael R; School of Physics and Astronomy, University of Leicester , University Road , Leicester LE1 7RH, UK
Acton, Jack S ; School of Physics and Astronomy, University of Leicester , University Road , Leicester LE1 7RH, UK
Günther, Maximilian N ; European Space Agency (ESA), European Space Research and Technology Centre (ESTEC) , Keplerlaan 1, NL-2201 AZ Noordwijk , the Netherlands
Nielsen, Louise D; European Southern Observatory , Karl-Schwarzschildstr. 2, D-85748 Garching bei München , Germany
Burleigh, Matthew R; School of Physics and Astronomy, University of Leicester , University Road , Leicester LE1 7RH, UK
Belardi, Claudia; School of Physics and Astronomy, University of Leicester , University Road , Leicester LE1 7RH, UK
Tilbrook, Rosanna H; School of Physics and Astronomy, University of Leicester , University Road , Leicester LE1 7RH, UK
Turner, Oliver ; Département d’astronomie, Université de Genéve , 51 chemin Pegasi, CH-1290 Sauverny , Switzerland
Howell, Steve B; NASA Ames Research Center, Moffett Field , CA 94035 , USA
Clark, Catherine A; Jet Propulsion Laboratory, California Institute of Technology , Pasadena, CA 91109 , USA ; NASA Exoplanet Science Institute, IPAC, California Institute of Technology , Pasadena, CA 91125 , USA
Littlefield, Colin; NASA Ames Research Center, Moffett Field , CA 94035 , USA ; Bay Area Environmental Research Institute , Moffett Field, CA 94035 , USA
Barkaoui, Khalid ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Exoplanets in Transit: Identification and Characterization ; Department of Earth, Atmospheric and Planetary Science, Massachusetts Institute of Technology , 77 Massachusetts Avenue, Cambridge, MA 02139 , USA ; Instituto de Astrofísica de Canarias (IAC) , Calle Vía Láctea s/n, 38200, La Laguna, Tenerife , Spain
Alves, Douglas R ; Departamento de Astronomía, Universidad de Chile , Casilla 36-D, Santiago , Chile ; Centro de Astrofísica y Tecnologías Afines (CATA) , Casilla 36-D, Santiago , Chile
Anderson, David R ; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road , Coventry CV4 7AL , UK ; Department of Physics, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL , UK
Bayliss, Daniel ; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road , Coventry CV4 7AL , UK ; Department of Physics, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL , UK
Bouchy, Francois; Département d’astronomie, Université de Genéve , 51 chemin Pegasi, CH-1290 Sauverny , Switzerland
Bryant, Edward M ; Mullard Space Science Laboratory, University College London , Holmbury St Mary, Dorking, Surrey RH5 6NT , UK
Dransfield, George; School of Physics & Astronomy, University of Birmingham , Edgbaston, Birmingham B15 2TT , UK
Ducrot, Elsa; AIM, CEA, CNRS, Université Paris-Saclay, Université de Paris , F-91191 Gif-sur-Yvette , France
Eigmüller, Philipp; Institute of Planetary Research, German Aerospace Center , Rutherfordstrasse 2, D-12489 Berlin , Germany
Gill, Samuel; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road , Coventry CV4 7AL , UK ; Department of Physics, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL , UK
Gillen, Edward ; Astronomy Unit, Queen Mary University of London , Mile End Road, London E1 4NS , UK ; Astrophysics Group, Cavendish Laboratory , J.J. Thomson Avenue, Cambridge CB3 0HE , UK
Gillon, Michaël ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO)
Hawthorn, Faith ; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road , Coventry CV4 7AL , UK ; Department of Physics, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL , UK
Hooton, Matthew J ; Cavendish Laboratory, JJ Thomson Avenue , Cambridge CB3 0HE , UK
Jackman, James A G ; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road , Coventry CV4 7AL , UK ; Department of Physics, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL , UK ; School of Earth and Space Exploration, Arizona State University , Tempe, AZ 85287 , USA
Jehin, Emmanuel ; Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR)
Jenkins, James S; Centro de Astrofísica y Tecnologías Afines (CATA) , Casilla 36-D, Santiago , Chile ; Núcleo de Astronomía, Facultad de Ingeniería y Ciencias, Universidad Diego Portales , Av. Ejército 441, Santiago , Chile
Kendall, Alicia; School of Physics and Astronomy, University of Leicester , University Road , Leicester LE1 7RH, UK
Lendl, Monika ; Département d’astronomie, Université de Genéve , 51 chemin Pegasi, CH-1290 Sauverny , Switzerland
McCormac, James; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road , Coventry CV4 7AL , UK ; Department of Physics, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL , UK
Moyano, Maximiliano; Instituto de Astronomía, Universidad Católica del Norte , Angamos 0610, Antofagasta 1270709 , Chile
Pedersen, Peter Pihlmann; Cavendish Laboratory, JJ Thomson Avenue , Cambridge CB3 0HE , UK ; Department of Physics, ETH Zurich , Wolfgang-Pauli-Strasse 2, CH-8093 Zurich , Switzerland
Pozuelos, Francisco J; Instituto de Astrofísica de Andalucía (IAA-CSIC) , Glorieta de la Astronomía s/n, E-18008 Granada , Spain
Ramsay, Gavin ; Armagh Observatory & Planetarium , College Hill, Armagh BT61 9DG , UK
Sefako, Ramotholo R; South African Astronomical Observatory , PO Box 9, Observatory 7935, Cape Town , South Africa
Triaud, Amaury H M J ; School of Physics & Astronomy, University of Birmingham , Edgbaston, Birmingham B15 2TT , UK
Udry, Stephane; Département d’astronomie, Université de Genéve , 51 chemin Pegasi, CH-1290 Sauverny , Switzerland
Vines, Jose I; Instituto de Astronomía, Universidad Católica del Norte , Angamos 0610, Antofagasta 1270709 , Chile
Watson, Christopher A; Astrophysics Research Centre, School of Mathematics and Physics, Queen’s University Belfast , BT7 1NN Belfast , UK
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Wheatley, Peter J ; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road , Coventry CV4 7AL , UK ; Department of Physics, University of Warwick , Gibbet Hill Road, Coventry CV4 7AL , UK
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