JWST/NIRCam Discovery of the First Y+Y Brown Dwarf Binary: WISE J033605.05-014350.4

Article

Pope, Benjamin J. S.. 2023. "JWST/NIRCam Discovery of the First Y+Y Brown Dwarf Binary: WISE J033605.05-014350.4." The Astrophysical Journal Letters. 947 (2). https://doi.org/10.3847/2041-8213/acc86d
Article Title

JWST/NIRCam Discovery of the First Y+Y Brown Dwarf Binary: WISE J033605.05-014350.4

ERA Journal ID45091
Article CategoryArticle
AuthorsPope, Benjamin J. S.
Journal TitleThe Astrophysical Journal Letters
Journal Citation947 (2)
Article NumberL30
Number of Pages6
Year2023
PublisherIOP Publishing
ISSN2041-8205
2041-8213
Digital Object Identifier (DOI)https://doi.org/10.3847/2041-8213/acc86d
Web Address (URL)https://iopscience.iop.org/article/10.3847/2041-8213/acc86d/meta
AbstractWe report the discovery of the first brown dwarf binary system with a Y dwarf primary, WISE J033605.05?014350.4, observed with NIRCam on JWST with the F150W and F480M filters. We employed an empirical point-spread function binary model to identify the companion, located at a projected separation of 0.?084, position angle of 295°, and with contrasts of 2.8 and 1.8 mag in F150W and F480M, respectively. At a distance of 10 pc based on its Spitzer parallax, and assuming a random inclination distribution, the physical separation is approximately 1 au. Evolutionary models predict for that an age of 1-5 Gyr, the companion mass is about 4-12.5 Jupiter masses around the 7.5-20 Jupiter mass primary, corresponding to a companion-to-host mass fraction of q = 0.61 ± 0.05. Under the assumption of a Keplerian orbit the period for this extreme binary is in the range of 5-9 yr. The system joins a small but growing sample of ultracool dwarf binaries with effective temperatures of a few hundreds of Kelvin. Brown dwarf binaries lie at the nexus of importance for understanding the formation mechanisms of these elusive objects, as they allow us to investigate whether the companions formed as stars or as planets in a disk around the primary. © 2023. The Author(s). Published by the American Astronomical Society.
KeywordsBrown dwarfs; Y dwarfs; James Webb Space Telescope
ANZSRC Field of Research 20205101. Astronomical sciences
Byline AffiliationsCentre for Astrophysics
University of Queensland
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