A T8.5 brown dwarf member of the ξ ursae majoris system

Edward L. Wright; M. F. Skrutskie; J. Davy Kirkpatrick; Christopher R. Gelino; Roger L. Griffith; Kenneth A. Marsh; Tom Jarrett; M. J. Nelson; H. J. Borish; Gregory MacE; Amanda K. Mainzer; Peter R. Eisenhardt; Ian S. McLean; John J. Tobin; Michael C. Cushing

doi:10.1088/0004-6256/145/3/84

A T8.5 brown dwarf member of the ξ ursae majoris system

Edward L. Wright, M. F. Skrutskie, J. Davy Kirkpatrick, Christopher R. Gelino, Roger L. Griffith, Kenneth A. Marsh, Tom Jarrett, M. J. Nelson, H. J. Borish, Gregory MacE, Amanda K. Mainzer, Peter R. Eisenhardt, Ian S. McLean, John J. Tobin, Michael C. Cushing

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25 Scopus citations

Abstract

The Wide-field Infrared Survey Explorer has revealed a T8.5 brown dwarf (WISE J111838.70+312537.9) that exhibits common proper motion with a solar-neighborhood (8 pc) quadruple star system - ξ Ursae Majoris. The angular separation is 8.′5, and the projected physical separation is ≈4000 AU. The sub-solar metallicity and low chromospheric activity of ξ UMa A argue that the system has an age of at least 2 Gyr. The infrared luminosity and color of the brown dwarf suggests the mass of this companion ranges between 14 and 38 M_J for system ages of 2 and 8 Gyr, respectively.

Original language	English (US)
Article number	84
Journal	Astronomical Journal
Volume	145
Issue number	3
DOIs	https://doi.org/10.1088/0004-6256/145/3/84
State	Published - Mar 2013
Externally published	Yes

Keywords

brown dwarfs
infrared: stars
solar neighborhood
stars: late-type
stars: low-mass

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1088/0004-6256/145/3/84

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Wright, E. L., Skrutskie, M. F., Kirkpatrick, J. D., Gelino, C. R., Griffith, R. L., Marsh, K. A., Jarrett, T., Nelson, M. J., Borish, H. J., MacE, G., Mainzer, A. K., Eisenhardt, P. R., McLean, I. S., Tobin, J. J., & Cushing, M. C. (2013). A T8.5 brown dwarf member of the ξ ursae majoris system. Astronomical Journal, 145(3), Article 84. https://doi.org/10.1088/0004-6256/145/3/84

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title = "A T8.5 brown dwarf member of the ξ ursae majoris system",

abstract = "The Wide-field Infrared Survey Explorer has revealed a T8.5 brown dwarf (WISE J111838.70+312537.9) that exhibits common proper motion with a solar-neighborhood (8 pc) quadruple star system - ξ Ursae Majoris. The angular separation is 8.′5, and the projected physical separation is ≈4000 AU. The sub-solar metallicity and low chromospheric activity of ξ UMa A argue that the system has an age of at least 2 Gyr. The infrared luminosity and color of the brown dwarf suggests the mass of this companion ranges between 14 and 38 MJ for system ages of 2 and 8 Gyr, respectively.",

keywords = "brown dwarfs, infrared: stars, solar neighborhood, stars: late-type, stars: low-mass",

author = "Wright, {Edward L.} and Skrutskie, {M. F.} and Kirkpatrick, {J. Davy} and Gelino, {Christopher R.} and Griffith, {Roger L.} and Marsh, {Kenneth A.} and Tom Jarrett and Nelson, {M. J.} and Borish, {H. J.} and Gregory MacE and Mainzer, {Amanda K.} and Eisenhardt, {Peter R.} and McLean, {Ian S.} and Tobin, {John J.} and Cushing, {Michael C.}",

year = "2013",

month = mar,

doi = "10.1088/0004-6256/145/3/84",

language = "English (US)",

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AU - Wright, Edward L.

AU - Skrutskie, M. F.

AU - Kirkpatrick, J. Davy

AU - Gelino, Christopher R.

AU - Griffith, Roger L.

AU - Marsh, Kenneth A.

AU - Jarrett, Tom

AU - Nelson, M. J.

AU - Borish, H. J.

AU - MacE, Gregory

AU - Mainzer, Amanda K.

AU - Eisenhardt, Peter R.

AU - McLean, Ian S.

AU - Tobin, John J.

AU - Cushing, Michael C.

PY - 2013/3

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AB - The Wide-field Infrared Survey Explorer has revealed a T8.5 brown dwarf (WISE J111838.70+312537.9) that exhibits common proper motion with a solar-neighborhood (8 pc) quadruple star system - ξ Ursae Majoris. The angular separation is 8.′5, and the projected physical separation is ≈4000 AU. The sub-solar metallicity and low chromospheric activity of ξ UMa A argue that the system has an age of at least 2 Gyr. The infrared luminosity and color of the brown dwarf suggests the mass of this companion ranges between 14 and 38 MJ for system ages of 2 and 8 Gyr, respectively.

KW - brown dwarfs

KW - infrared: stars

KW - solar neighborhood

KW - stars: late-type

KW - stars: low-mass

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A T8.5 brown dwarf member of the ξ ursae majoris system

Abstract

Keywords

ASJC Scopus subject areas

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