A possible third component in the L dwarf binary system DENIS-P J020529.0-115925 discovered with the Hubble Space Telescope

Abstract

We present results showing that the multiple system DENIS-P J020529.0-115925 is likely to be a triple system of brown dwarfs. The secondary of this previously known binary system shows a clear elongation on six images obtained at six different epochs. Significant residuals remain after PSF subtraction on these images, characteristic of multiplicity, and indicating that the secondary is probably a double itself. Dual-PSF fitting shows that the shape of the secondary is consistent with that of a binary system. These measurements show that the probability that DENIS-P J020529.0-115925 is a triple system is very high. The photometric and spectroscopic properties of the system are consistent with the presence of three components with spectral types L5, L8 and T0.

15 pages, 3 tables, 6 figures, accepted for publication in AJ. High resolution version available at ftp://ftp.mpe.mpg.de/people/hbouy/publications/denis0205.ps.gz

References in corpus (17)

• Evolutionary models for very-low-mass stars and brown dwarfs with dusty atmospheres
• Astrometry and Photometry for Cool Dwarfs and Brown Dwarfs
• Sixty-seven Additional L Dwarfs Discovered by the Two Micron All Sky Survey (2MASS)
• Towards Spectral Classification of L and T Dwarfs: Infrared and Optical Spectroscopy and Analysis
• The Spectra of T Dwarfs I: Near-Infrared Data and Spectral Classification
• Binarity in Brown Dwarfs: T Dwarf Binaries Discovered with the Hubble Space Telescope WPFC2
• Detection of Nine M8.0-L0.5 Binaries: The Very Low Mass Binary Population and its Implications for Brown Dwarf and VLM Star Formation
• Multiplicity of Nearby Free-floating Ultra-cool Dwarfs: a HST-WFPC2 search for companions
• An Effective Temperature Scale for Late M and L Dwarfs, from Resonance Absorption Lines of CsI and RbI
• Hubble Space Telescope Observations of Binary Very-Low-Mass Stars and Brown Dwarfs
• On the origin of brown dwarfs and free-floating planetary mass objects
• Keck Imaging of Binary L Dwarfs
• An HST/WFPC2 Survey for Brown Dwarf Binaries in the alpha Per and the Pleiades Open Clusters
• Photometric Variability at the L/T Dwarf Boundary
• K-Band Spectra and Narrowband Photometry of DENIS Field Brown Dwarfs
• Effective Temperatures of late L dwarfs and the onset of Methane signatures
• Near-Infrared Spectroscopy of Brown Dwarfs: Methane and the Transition between the L and T Spectral Types

Cited by in corpus (33)

• The Hawaii Infrared Parallax Program. I. Ultracool Binaries and the L/T Transition
• Meeting the Cool Neighbors. IX. The Luminosity Function of M7-L8 Ultracool Dwarfs in the Field
• Hubble Space Telescope NICMOS Observations of T Dwarfs: Brown Dwarf Multiplicity and New Probes of the L/T Transition
• Individual Dynamical Masses of Ultracool Dwarfs
• The Field Substellar Mass Function Based on the Full-sky 20-pc Census of 525 L, T, and Y Dwarfs
• A search for binary systems among the nearest L dwarfs
• A Volume-Limited Sample of Ultracool Dwarfs. I. Construction, Space Density, and a Gap in the L/T Transition
• The NIRSPEC Brown Dwarf Spectroscopic Survey II: High-Resolution J-Band Spectra of M, L and T Dwarfs
• Discovery of a High Proper Motion L Dwarf Binary: 2MASS J15200224-4422419AB
• Signatures of Cloud, Temperature, and Gravity From Spectra of the Closest Brown Dwarfs
• Multiplicity of very low-mass objects in the Upper Scorpius OB association: a possible wide binary population
• Adaptive Optics imaging of VHS 1256-1257: A Low Mass Companion to a Brown Dwarf Binary System
• 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
• The Hawaii Infrared Parallax Program. III. 2MASS J0249-0557 c: A Wide Planetary-mass Companion to a Low-mass Binary in the beta Pic Moving Group
• A Search for L/T Transition Dwarfs With Pan-STARRS1 and WISE: Discovery of Seven Nearby Objects Including Two Candidate Spectroscopic Variables
• A Hubble Space Telescope ACS Search for Brown Dwarf Binaries in the Pleiades Open Cluster
• L and T dwarfs in the Hyades and Ursa Major moving groups
• Hubble Space Telescope Imaging and Spectral Analysis of Two Brown Dwarf Binaries at the L Dwarf/T Dwarf Transition
• Discovery of a Visual T-Dwarf Triple System and Binarity at the L/T Transition
• Resolved Hubble Space spectroscopy of ultracool binary systems
• Follow-up observations of binary ultra-cool dwarfs
• The ages of L dwarfs
• Discovery of a widely separated binary system of very low mass stars
• Parallaxes of southern extremely cool objects III: 118 L \& T dwarfs
• Thermal Infrared Imaging and Atmospheric Modeling of VHS J125601.92-125723.9 b: Evidence for Moderately Thick Clouds and Equilibrium Carbon Chemistry in a Hierarchical Triple System
• Radial Velocity Variability of Field Brown Dwarfs
• Radio emission in ultracool dwarfs: the nearby substellar triple system VHS 1256$-$1257
• Radio emission in a nearby ultracool dwarf binary: a multi-frequency study
• Individual Dynamical Masses of DENIS J063001.4$-$184014AB Reveal A Likely Young Brown Dwarf Triple
• Astrophysics in 2005
• NICMOS Kernel-Phase Interferometry I: Catalogue of Brown Dwarfs Observed in F110W and F170M
• SpeX Spectroscopy of Unresolved Very Low-Mass Binaries. I. Identification of Seventeen Candidate Binaries Straddling the L Dwarf/T Dwarf Transition