Article (Scientific journals)
Evolutionary models for ultracool dwarfs
Silva Fernandes, Catarina; Van Grootel, Valérie; Salmon, Sébastien et al.
2019In Astrophysical Journal, 879 (2)
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Keywords :
stars: late-type; stars: low-mass
Abstract :
[en] Ultracool dwarfs (UCDs) have emerged as key targets for searches of transiting exoplanets. Precise estimates of the host parameters (including mass, age, and radius) are fundamental to constraining the physical properties of orbiting exoplanets. We have extended our evolutionary code Code Liégeois d'Evolution Stellaire to the UCD regime. We include relevant equations of state (EOSs) for H, He, as well as C and O elements to cover the temperature–density regime of UCD interiors. For various metallicities, we couple the interior models to two sets of model atmospheres as surface boundary conditions. We show that including C and O in the EOS has a significant effect close to the H-burning limit mass. The typical systematic error associated with uncertainties in input physics in evolutionary models is ~0.0005 M⊙. We test model results against observations for objects whose parameters have been determined from independent techniques. We are able to reproduce dynamical mass measurements of LSPM J1314+1320AB within 1σ with the condition of varying the metallicity (determined from calibrations) up to 2.5σ. For GJ 65AB, a 2σ agreement is obtained between individual masses from differential astrometry and those from evolutionary models. We provide tables of UCD models for various masses and metallicities that can be used as reference when estimating parameters for ultracool objects.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Silva Fernandes, Catarina ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Van Grootel, Valérie  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Salmon, Sébastien ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Aringer, Bernhard;  Università di Padova > Dipartamento di Fisica e Astronomia Galileo Galilei
Burgasser, Adam J.;  University of California, San Diego > Center for AStrophysics and Space Science
Scuflaire, Richard ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Brassard, Pierre;  Université du Québec > Départment de Physique
Fontaine, Gilles;  Université du Québec > Départment de Physique
Language :
English
Title :
Evolutionary models for ultracool dwarfs
Publication date :
10 July 2019
Journal title :
Astrophysical Journal
ISSN :
0004-637X
eISSN :
1538-4357
Publisher :
University of Chicago Press, United States - Illinois
Volume :
879
Issue :
2
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
ARC grant
Funders :
FWB - Fédération Wallonie-Bruxelles
Available on ORBi :
since 12 August 2019

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