Search for radio emission from the nearby binary brown dwarf system Ã"°Ã¢â‚¬Âº Indi Bab

David L. Blank

    Research output: Contribution to journalArticle

    Abstract

    We have observed the nearest known brown dwarfs, the binary system Ã"°Ã¢â‚¬Âº Indi Bab (d= 3.626 pc), for 8.6- and 4.8-GHz radio emission with the Australia Telescope Compact Array. If either brown dwarf emits radio flares, then they are respectively at least 5.5 and 1.2 times weaker than LP 944-20, the nearest brown dwarf with detected radio emission. We associate the ROSAT source 1WGA J2203.9 - 5647 with Ã"°Ã¢â‚¬Âº Indi Bab since the separation was about 30 arcsec at the time of the ROSAT observation. Assuming the association, then Ã"°Ã¢â‚¬Âº Indi Bab has an L0.4-2.4keV X-ray luminosity of 5.6 ÃÆ'Ã"šÃ†'ÂÃ"šÃ¢â‚¬" 1025 erg s-1 which makes it roughly a factor of 2 less luminous than LP 944-20. The radio non-detections imply that Ã"°Ã¢â‚¬Âº Indi Bab does not violate, or at least does not violate as strongly as LP 944-20, the GÃÆ'Ã"šÃ†'ÂÃ"šÃ‚¼del-Benz relationship of X-ray and radio emission.
    Original languageEnglish
    Number of pages2
    JournalMonthly Notices of the Royal Astronomical Society
    Publication statusPublished - 2004

    Keywords

    • brown dwarf stars
    • double stars
    • low mass stars
    • solar radio emission
    • É› Indi Bab

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