binaries: eclipsing; binaries: spectroscopic; stars: evolution; stars: fundamental parameters; stars: low mass; open clusters and associations: individual: Blanco 1
Abstract :
[en] We present the discovery and characterization of an eclipsing binary identified by the Next Generation Transit Survey in the ~115-Myr-old Blanco 1 open cluster. NGTS J0002-29 comprises three M dwarfs: a short-period binary and a companion in a wider orbit. This system is the first well-characterized, low-mass eclipsing binary in Blanco 1. With a low mass ratio, a tertiary companion, and binary components that straddle the fully convective boundary, it is an important benchmark system, and one of only two well-characterized, low-mass eclipsing binaries at this age. We simultaneously model light curves from NGTS, TESS, SPECULOOS, and SAAO, radial velocities from VLT/UVES and Keck/HIRES, and the system's spectral energy distribution. We find that the binary components travel on circular orbits around their common centre of mass in Porb = 1.098 005 24 ± 0.000 000 38 d, and have masses Mpri = 0.3978 ± 0.0033 M⊙ and Msec = 0.2245 ± 0.0018 M⊙, radii Rpri = 0.4037 ± 0.0048 R⊙ and Rsec = 0.2759 ± 0.0055 R⊙, and effective temperatures $T_{\rm pri}=\mbox{$3372\, ^{+44}_{-37}$}$ K and $T_{\rm sec}=\mbox{$3231\, ^{+38}_{-31}$}$ K. We compare these properties to the predictions of seven stellar evolution models, which typically imply an inflated primary. The system joins a list of 19 well-characterized, low-mass, sub-Gyr, stellar-mass eclipsing binaries, which constitute some of the strongest observational tests of stellar evolution theory at low masses and young ages.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Smith, Gareth D.; Astrophysics Group, Cavendish Laboratory, J. J. Thomson Avenue, Cambridge CB3 0HE, 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
Queloz, Didier; Astrophysics Group, Cavendish Laboratory, J. J. Thomson Avenue, Cambridge CB3 0HE, UK
Hillenbrand, Lynne A.; Department of Astronomy, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA
Acton, Jack S.; School of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK
Alves, Douglas R.; Departamento de Astronomia, Universidad de Chile, Casilla 36-D, Santiago, Chile
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, UK
Bayliss, Daniel; 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, UK
Briegal, Joshua T.; Astrophysics Group, Cavendish Laboratory, J. J. Thomson Avenue, Cambridge CB3 0HE, UK
Burleigh, Matthew R.; 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
Delrez, Laetitia ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic
Dransfield, Georgina; School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
Ducrot, Elsa ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic
Gill, Samuel; 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, UK
Gillon, Michaël ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic
Goad, Michael R.; School of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK
Günther, Maximilian N.; Department of Physics, and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
Henderson, Beth A.; School of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK
Jenkins, James S.; Departamento de Astronomia, Universidad de Chile, Casilla 36-D, Santiago, Chile ; Núcleo de Astronomía, Facultad de Ingeniería y Ciencias, Universidad Diego Portales, Avenida Ejército 441, Santiago, Chile
Jehin, Emmanuel ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Moyano, Maximiliano; Instituto de Astronomía, Universidad Católica del Norte, Angamos 0610, 1270709 Antofagasta, Chile
Murray, Catriona A.; Astrophysics Group, Cavendish Laboratory, J. J. Thomson Avenue, Cambridge CB3 0HE, UK
Pedersen, Peter P.; Astrophysics Group, Cavendish Laboratory, J. J. Thomson Avenue, Cambridge CB3 0HE, UK
Sebastian, Daniel ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic
Thompson, Samantha; Astrophysics Group, Cavendish Laboratory, J. J. Thomson Avenue, Cambridge CB3 0HE, UK
Tilbrook, Rosanna H.; School of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK
Triaud, Amaury H. M. J.; School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
Vines, Jose I.; Departamento de Astronomia, Universidad de Chile, Casilla 36-D, Santiago, Chile
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, UK)
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