The dM4.5e star G124-62 and its binary L dwarf companion DENIS-P J1441-0945: Common proper motion, distance, age, and masses

Abstract

We present astrometric and photometric measurements of the field binary L1 dwarf DENIS-P J1441-0945. Analysis of archival HST images and photometric parallax measurements give a distance of 34+/-7 pc and a proper motion close to that of the nearby high proper motion star G124-62. Comparison of SuperCOSMOS and 2MASS images confirms that these objects form a common proper motion pair, while spectroscopy of G124-62 shows it to be a dM4.5e star. The kinematics show that this system is a member of the Hyades supercluster. The resulting age constraints for the system are 500--800 Myr and the mass of each component of DENIS-P J1441-0945 is 0.072 (+0.010/-0.018) M_sun.

arXiv comment6 pages, 6 figures, accepted by A&A on March 25, 2005

References in corpus (17)

• Evolutionary models for very-low-mass stars and brown dwarfs with dusty atmospheres
• Color Transformations for the 2MASS Second Incremental Data Release
• The Theory of Brown Dwarfs and Extrasolar Giant Planets
• Astrometry and Photometry for Cool Dwarfs and Brown Dwarfs
• Late-type stars members of young stellar kinematic groups - I. Single stars
• Keck Spectra of Pleiades Brown Dwarf Candidates and a Precise Determination of the Lithium Depletion Edge in the Pleiades
• Brown Dwarf Companions to G-type Stars. I: Gliese 417B and Gliese 584C
• The Palomar/MSU Nearby Star Spectroscopic Survey III: Chromospheric Activity, M-dwarf Ages and the Local Star Formation History
• Multiplicity of Nearby Free-floating Ultra-cool Dwarfs: a HST-WFPC2 search for companions
• Infrared Spectra and Spectral Energy Distributions of Late-M- and L-Dwarfs
• X-ray emission from young stars in Taurus-Auriga-Perseus: Luminosity functions and the rotation-activity-age relation
• Meeting the Cool Neighbours I: Nearby stars in the NLTT Catalogue - Defining the sample
• Rotational velocities of low-mass stars in the Pleiades and Hyades
• Spectroscopic rotation velocities of L dwarfs from VLT/UVES and their comparison with periods from photometric monitoring
• New neighbours: V. 35 DENIS late-M dwarfs between 10 and 30 parsecs
• Improved Astrometry and Photometry for the Luyten Catalog. I. Bright Stars
• Astrometric proof of companionship for the L dwarf companion candidate GJ 1048B

Cited by in corpus (22)

• The Hawaii Infrared Parallax Program. II. Young Ultracool Field Dwarfs
• A Sample of Very Young Field L Dwarfs and Implications for the Brown Dwarf "Lithium Test" at Early Ages
• Wide, Cool and Ultracool Companions to Nearby Stars from Pan-STARRS1
• Reaching the boundary between stellar kinematic groups and very wide binaries. The Washington Double Stars with the widest angular separations
• Southern wide very low-mass stars and brown dwarfs in resolved binary and multiple systems
• Proper motions of field L and T dwarfs
• Discovery of the first wide L dwarf + giant binary system and eight other ultra-cool dwarfs in wide binaries
• On the kinematic age of brown dwarfs: Radial velocities and space motions of 43 nearby L dwarfs
• Discovery of a Very Low Mass Triple with Late-M and T Dwarf Components: LP 704-48/SDSS J0006-0852AB
• Identification of a Wide, Low-Mass Multiple System Containing the Brown Dwarf 2MASS J0850359+105716
• Discovery of the Widest Very Low Mass Field Binary
• The widest ultracool binary
• Two new ultra-cool benchmark systems from WISE+2MASS
• Low-mass companions to Hyades stars
• Resolved Hubble Space spectroscopy of ultracool binary systems
• Parallaxes of southern extremely cool objects III: 118 L \& T dwarfs
• Discovery of wide low and very low-mass binary systems using Virtual Observatory tools
• New brown dwarf companions to dM(e) stars
• Increasing the census of L and T dwarfs in wide binary and multiple systems using Dark Energy Survey DR1 and Gaia DR2 data
• An extremely wide and very low-mass pair with common proper motion. Is it representative of a nearby halo stream?
• The Brown Dwarf Kinematics Project (BDKP). II. Details on Nine Wide Common Proper Motion Very Low-Mass Companions to Nearby Stars
• The Gaia Ultracool Dwarf Sample -- IV. GTC/OSIRIS optical spectra of Gaia late-M and L dwarfs