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The first wide ultracool binary dwarf in the field: DENIS-J055146.0-443412.2 (M8.5 + L0)
We present observations of a new very low mass field binary, discoveredduring an infrared imaging survey of 250 DENIS L and very late-M dwarfs.DENIS-J055146.0-443412.2 is an M8.5 + L0 pair, with a physicalseparation of over 200 AU. This makes it the widest very low mass binaryknown in the field, by an order of magnitude. Such a system is fragile,and it would not have survived a close encounter with a third body. Itsexistence demonstrate that some very low mass stars/brown dwarfs formwithout ejection from a multiple system, or any other strong dynamicalinteraction.
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Observation and Astrometry data
| Constellation: | Πρύμνη |
| Right ascension: | 06h23m13.73s |
| Declination: | -48°34'10.9" |
| Apparent magnitude: | 8.498 |
| Distance: | 141.643 parsecs |
| Proper motion RA: | 11.8 |
| Proper motion Dec: | 58.3 |
| B-T magnitude: | 9.081 |
| V-T magnitude: | 8.547 |
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