Evolutionary models for ultracool dwarfs

Catarina Silva Fernandes; Valérie Van Grootel; Sébastian J. A. J. Salmon; Bernhard Aringer; Adam J. Burgasser; Richard Scuflaire; Pierre Brassard; Gilles Fontaine

doi:10.3847/1538-4357/ab2333

Evolutionary models for ultracool dwarfs

Catarina Silva Fernandes, Valérie Van Grootel, Sébastian J. A. J. Salmon, Bernhard Aringer, Adam J. Burgasser, Richard Scuflaire, Pierre Brassard, Gilles Fontaine

Astrophysics and Planetary Science

6 Citations (Scopus)

Abstract

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_o. 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.

Original language	English
Article number	94
Journal	Astrophysical Journal
Volume	879
Issue number	2
Number of pages	9
ISSN	0004-637X
DOIs	https://doi.org/10.3847/1538-4357/ab2333
Publication status	Published - 10 Jul 2019

Access to Document

10.3847/1538-4357/ab2333

https://iopscience.iop.org/article/10.3847/1538-4357/ab2333/pdf

Cite this

@article{093f2380d6b4479e8073996499053cc1,

title = "Evolutionary models for ultracool dwarfs",

abstract = "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 Li{\'e}geois 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 Mo. 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.",

author = "{Silva Fernandes}, Catarina and {Van Grootel}, Val{\'e}rie and {J. A. J. Salmon}, S{\'e}bastian and Bernhard Aringer and {J. Burgasser}, Adam and Richard Scuflaire and Pierre Brassard and Gilles Fontaine",

year = "2019",

month = jul,

day = "10",

doi = "10.3847/1538-4357/ab2333",

language = "English",

volume = "879",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "Institute of Physics Publishing, Inc",

number = "2",

}

TY - JOUR

T1 - Evolutionary models for ultracool dwarfs

AU - Silva Fernandes, Catarina

AU - Van Grootel, Valérie

AU - J. A. J. Salmon, Sébastian

AU - Aringer, Bernhard

AU - J. Burgasser, Adam

AU - Scuflaire, Richard

AU - Brassard, Pierre

AU - Fontaine, Gilles

PY - 2019/7/10

Y1 - 2019/7/10

N2 - 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 Mo. 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.

AB - 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 Mo. 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.

U2 - 10.3847/1538-4357/ab2333

DO - 10.3847/1538-4357/ab2333

M3 - Journal article

SN - 0004-637X

VL - 879

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 94

ER -

Evolutionary models for ultracool dwarfs

Abstract

Access to Document

Fingerprint

Cite this