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

David L. Blank

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

David L. Blank

Research output: Contribution to journal › Article

Abstract

We have observed the nearest known brown dwarfs, the binary system Ãƒ"°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 Ãƒ"°Ã¢â‚¬Âº Indi Bab since the separation was about 30 arcsec at the time of the ROSAT observation. Assuming the association, then Ãƒ"°Ã¢â‚¬Âº Indi Bab has an L0.4-2.4keV X-ray luminosity of 5.6 ÃƒÆ’Ã†'Ãƒ"šÃ†'ÃƒÆ’Ã¢â‚¬Å¡Ãƒ"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 Ãƒ"°Ã¢â‚¬Âº Indi Bab does not violate, or at least does not violate as strongly as LP 944-20, the GÃƒÆ’Ã†'Ãƒ"šÃ†'ÃƒÆ’Ã¢â‚¬Å¡Ãƒ"šÃ‚Â¼del-Benz relationship of X-ray and radio emission.

Original language	English
Number of pages	2
Journal	Monthly Notices of the Royal Astronomical Society
Publication status	Published - 2004

Keywords

brown dwarf stars
double stars
low mass stars
solar radio emission
Ã‰â€º Indi Bab

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title = "Search for radio emission from the nearby binary brown dwarf system {\~A}ƒ{"}°{\~A}¢{\^a}‚¬{\^A}º Indi Bab",

abstract = "We have observed the nearest known brown dwarfs, the binary system {\~A}ƒ{"}°{\~A}¢{\^a}‚¬{\^A}º 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 {\~A}ƒ{"}°{\~A}¢{\^a}‚¬{\^A}º Indi Bab since the separation was about 30 arcsec at the time of the ROSAT observation. Assuming the association, then {\~A}ƒ{"}°{\~A}¢{\^a}‚¬{\^A}º Indi Bab has an L0.4-2.4keV X-ray luminosity of 5.6 {\~A}ƒ{\AE}{\textquoteright}{\~A}†'{\~A}ƒ{"}{\v s}{\~A}†'{\~A}ƒ{\AE}{\textquoteright}{\~A}¢{\^a}‚¬{\AA}¡{\~A}ƒ{"}{\v s}{\~A}¢{\^a}‚¬{"} 1025 erg s-1 which makes it roughly a factor of 2 less luminous than LP 944-20. The radio non-detections imply that {\~A}ƒ{"}°{\~A}¢{\^a}‚¬{\^A}º Indi Bab does not violate, or at least does not violate as strongly as LP 944-20, the G{\~A}ƒ{\AE}{\textquoteright}{\~A}†'{\~A}ƒ{"}{\v s}{\~A}†'{\~A}ƒ{\AE}{\textquoteright}{\~A}¢{\^a}‚¬{\AA}¡{\~A}ƒ{"}{\v s}{\~A}‚{\^A}¼del-Benz relationship of X-ray and radio emission.",

keywords = "brown dwarf stars, double stars, low mass stars, solar radio emission, {\~A}‰{\^a}€º Indi Bab",

author = "Blank, {David L.}",

year = "2004",

language = "English",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

}

TY - JOUR

T1 - Search for radio emission from the nearby binary brown dwarf system Ãƒ"°Ã¢â‚¬Âº Indi Bab

AU - Blank, David L.

PY - 2004

Y1 - 2004

N2 - We have observed the nearest known brown dwarfs, the binary system Ãƒ"°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 Ãƒ"°Ã¢â‚¬Âº Indi Bab since the separation was about 30 arcsec at the time of the ROSAT observation. Assuming the association, then Ãƒ"°Ã¢â‚¬Âº Indi Bab has an L0.4-2.4keV X-ray luminosity of 5.6 ÃƒÆ’Ã†'Ãƒ"šÃ†'ÃƒÆ’Ã¢â‚¬Å¡Ãƒ"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 Ãƒ"°Ã¢â‚¬Âº Indi Bab does not violate, or at least does not violate as strongly as LP 944-20, the GÃƒÆ’Ã†'Ãƒ"šÃ†'ÃƒÆ’Ã¢â‚¬Å¡Ãƒ"šÃ‚Â¼del-Benz relationship of X-ray and radio emission.

AB - We have observed the nearest known brown dwarfs, the binary system Ãƒ"°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 Ãƒ"°Ã¢â‚¬Âº Indi Bab since the separation was about 30 arcsec at the time of the ROSAT observation. Assuming the association, then Ãƒ"°Ã¢â‚¬Âº Indi Bab has an L0.4-2.4keV X-ray luminosity of 5.6 ÃƒÆ’Ã†'Ãƒ"šÃ†'ÃƒÆ’Ã¢â‚¬Å¡Ãƒ"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 Ãƒ"°Ã¢â‚¬Âº Indi Bab does not violate, or at least does not violate as strongly as LP 944-20, the GÃƒÆ’Ã†'Ãƒ"šÃ†'ÃƒÆ’Ã¢â‚¬Å¡Ãƒ"šÃ‚Â¼del-Benz relationship of X-ray and radio emission.

KW - brown dwarf stars

KW - double stars

KW - low mass stars

KW - solar radio emission

KW - Ã‰â€º Indi Bab

UR - http://handle.uws.edu.au:8081/1959.7/36846

M3 - Article

SN - 0035-8711

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

ER -

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

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Keywords

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