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Title:
Discovery of a Young Planetary-Mass Binary
Authors:
Jayawardhana, Ray; Ivanov, Valentin D.
Affiliation:
AA(Department of Astronomy and Astrophysics, University of Toronto, Toronto, ON M5S 3H8, Canada.), AB(European Southern Observatory, Avenida Alonso de Cordova 3107, Vitacura, Santiago 19001, Chile.)
Publication:
Science, Volume 313, Issue 5791, pp. 1279-1281 (2006).
Publication Date:
09/2006
Category:
ASTRONOMY
Origin:
SCIENCE
DOI:
10.1126/science.1132128
Bibliographic Code:
2006Sci...313.1279J

Abstract

We have identified a companion to the young planetary-mass brown dwarf Oph 162225-240515. This pair forms a resolved binary consisting of two objects with masses comparable to those of extrasolar giant planets. Several lines of evidence confirm the coevality and youth of the two objects, suggesting that they form a physical binary. Models yield masses of ~14 and ~7 times the mass of Jupiter for the primary and the secondary object, respectively, at an age of ~1 million years. A wide (~240-astronomical unit) binary in the ultra-low-mass regime poses a challenge to some popular models of brown dwarf formation.
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