Title
Astrometric Monitoring Of The Binary Brown Dwarf Denis-P J1228.2-1547
Keywords
Astrometry; Stars: Binaries: Visual; Stars: Low-mass, brown dwarfs - Stars: Fundamental parameters
Abstract
We present astrometric monitoring data of the binary brown dwarf DENIS-PJ 1228.2-1547. The data have been obtained with the Hubble Space Telescope over a time span of 5.5 yr, and confirm that DENIS-PJ 1228.2-1547 is indeed a common proper motion, i.e., physical, binary. The data cover about l/8th of the binary orbit, indicating art orbital period of ≈45 yr, and a semimajor axis of ≈6.4 AU. A plausible fit of the orbital parameters indicates that both components of the binary are substellar, which is in good agreement with previous mass estimates based on the presence of lithium in the combined spectra of both components. Since the next periastron passage of DENIS-PJ1228.2-1547 is expected for the years 2030 to 2035, longterm astrometric monitoring is required to derive accurate mass estimates for the system and the individual components. The photometry obtained with HST/WFPC2 in the F814W band shows no indication for photometric variability with an amplitude larger than 0.05 mag over a time span of ≈ 1000 days.
Publication Date
12-1-2004
Publication Title
Astronomy and Astrophysics
Volume
428
Issue
1
Number of Pages
205-208
Document Type
Article
Personal Identifier
scopus
DOI Link
https://doi.org/10.1051/0004-6361:20041912
Copyright Status
Unknown
Socpus ID
10044287402 (Scopus)
Source API URL
https://api.elsevier.com/content/abstract/scopus_id/10044287402
STARS Citation
Brandner, W.; Martín, E. L.; Bouy, H.; Köhler, R.; and Delfosse, X., "Astrometric Monitoring Of The Binary Brown Dwarf Denis-P J1228.2-1547" (2004). Scopus Export 2000s. 4648.
https://stars.library.ucf.edu/scopus2000/4648