The very low mass multiple system LHS\,1070 -- a testbed for model atmospheres for the lower end of the main sequence

Abstract

LHS1070 is a nearby multiple system of low mass stars. It is an important source of information for probing the low mass end of the main sequence, down to the hydrogen-burning limit. The primary of the system is a mid-M dwarf and two components are late-M to early L dwarfs, at the star-brown dwarf transition. Hence LHS1070 is a valuable object to understand the onset of dust formation in cool stellar atmospheres.This work aims at determining the fundamental stellar parameters of LHS1070 and to test recent model atmospheres: BT-Dusty,BT-Settl, DRIFT, and MARCS models.Unlike in previous studies, we have performed a chi^2-minimization comparing well calibrated optical and infrared spectra with recent cool star synthetic spectra leading to the determination of the physical stellar parameters Teff, radius, and log g for each of the three components of LHS1070.

Accepted in Astronomy and Astrophysics, 15 pages, 11 figures

References in corpus (12)

• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• A comparison of chemistry and dust cloud formation in ultracool dwarf model atmospheres
• Metal-Rich M-dwarf Planet Hosts: Metallicities with K-Band Spectra
• Dust in Brown Dwarfs and Extra-solar Planets I. Chemical composition and spectral appearance of quasi-static cloud layers
• Consistent simulations of substellar atmospheres and non-equilibrium dust-cloud formation
• K-H_2 Quasi-molecular absorption detected in the T-dwarf epsilon Indi Ba
• The Age, Stellar Content and Star Formation Timescale of the B59 Dense Core
• Energy transport, overshoot, and mixing in the atmospheres of M-type main- and pre-main-sequence objects
• A high resolution spectral atlas of brown dwarfs
• Orbits and Masses in the multiple system LHS 1070
• Improved orbital solution and masses for the very low-mass multiple system LHS 1070
• Spectral type dependent rotational braking and strong magnetic flux in three components of the late-M multiple system LHS 1070

Cited by in corpus (17)

• The Effective Temperature Scale of M dwarfs
• Individual Dynamical Masses of Ultracool Dwarfs
• The 10 parsec sample in the Gaia era
• The CARMENES search for exoplanets around M dwarfs. Stellar atmospheric parameters of target stars with SteParSyn
• A Volume-Limited Sample of Ultracool Dwarfs. I. Construction, Space Density, and a Gap in the L/T Transition
• Atmospheres of Brown Dwarfs
• The Ultracool SpeXtroscopic Survey. I. Volume-Limited Spectroscopic Sample and Luminosity Function of M7$-$L5 Ultracool Dwarfs
• A high resolution spectroscopic atlas of M subdwarfs - Effective temperature and metallicity
• The SDSS-III APOGEE Radial Velocity Survey of M dwarfs I: Description of Survey and Science Goals
• Photospheric properties and fundamental parameters of M dwarfs
• Spectral energy distribution of M-subdwarfs: A study of their atmospheric properties
• First Results from MFOSC-P : Low Resolution Optical Spectroscopy of a Sample of M dwarfs within 100 parsecs
• Exploring the short-term variability of H$\alpha$ and H$\beta$ emissions in a sample of M dwarfs
• A dayside thermal inversion in the atmosphere of WASP-19b
• CFBDS J111807-064016: A new L/T transition brown dwarf in a binary system
• Spectral analysis of two directly imaged benchmark L dwarf companions at the stellar-substellar boundary
• A Global Perspective with Updated Constraints on the Ultra-hot Jupiter WASP-19b: Atmospheric Properties and Stellar Activity