A search for substellar companions to the two nearest brown dwarf systems
Journal Article
·
· The Astronomical Journal (Online)
WISE J104915.57–531906.1 A+B and WISE J085510.83–071442.5 were recently discovered as the third and fourth closest known systems to the Sun, respectively (2.0 and 2.3 pc). The former consists of a L8+T0.5 binary and the latter is a probable Y dwarf and is the coldest known brown dwarf (∼250 K). We present a search for common proper motion companions to these brown dwarfs using multi-epoch mid-infrared images from the Spitzer Space Telescope. We have also obtained near-infrared adaptive optics (AO) images of WISE J104915.57–531906.1 A+B with the Very Large Telescope to search for companions at smaller separations than reached by Spitzer. No new companions are detected in either system. At projected separations of 25″–420″ (50–840 AU) for WISE J104915.57–531906.1 A+B and 4″–420″ (9–970 AU) for WISE J085510.83–071442.5, the Spitzer images are sensitive to companions with M{sub 4.5}≲21.6 and 21.9, respectively, which correspond to masses of ≳1 M{sub Jup} for ages of ⩾1 Gyr and temperatures of ≳150 K. The detection limit in the AO images of WISE J104915.57–531906.1 A + B is ΔH∼10 at 3″–15″ (6–30 AU), or ≳7 M{sub Jup} for ⩾1 Gyr.
- OSTI ID:
- 22879443
- Journal Information:
- The Astronomical Journal (Online), Journal Name: The Astronomical Journal (Online) Journal Issue: 2 Vol. 150; ISSN 1538-3881
- Country of Publication:
- United States
- Language:
- English
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