TY - JOUR
T1 - JWST/NIRCam Discovery of the First Y+Y Brown Dwarf Binary
T2 - WISE J033605.05-014350.4
AU - Calissendorff, Per
AU - De Furio, Matthew
AU - Meyer, Michael
AU - Albert, Loïc
AU - Aganze, Christian
AU - Ali-Dib, Mohamad
AU - Bardalez Gagliuffi, Daniella C.
AU - Baron, Frederique
AU - Beichman, Charles A.
AU - Burgasser, Adam J.
AU - Cushing, Michael C.
AU - Faherty, Jacqueline Kelly
AU - Fontanive, Clémence
AU - Gelino, Christopher R.
AU - Gizis, John E.
AU - Greenbaum, Alexandra Z.
AU - Kirkpatrick, J. Davy
AU - Leggett, Sandy K.
AU - Martinache, Frantz
AU - Mary, David
AU - N’Diaye, Mamadou
AU - Pope, Benjamin J.S.
AU - Roellig, Thomas
AU - Sahlmann, Johannes
AU - Sivaramakrishnan, Anand
AU - Thorngren, Daniel Peter
AU - Ygouf, Marie
AU - Vandal, Thomas
N1 - Funding Information:
We thank the reviewer for the constructive comments. This work is based on observations made with the NASA/ESA/CSA James Webb Space Telescope. The data were obtained from the Mikulski Archive for Space Telescopes at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-03127 for JWST. These observations are associated with program #2473 and can be accessed via doi:10.17909/9zgc-m183. Support for program #2743 was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-03127. L.A. acknowledges support of the Canadian Space Agency through contract 22JWGO1-11. T.L.R. would like to acknowledge the support of the NASA Science Mission Directorate under WBS 411672.07.05.05.03.01. This work was authored by employees of Caltech/IPAC under Contract No. 80GSFC21R0032 with the National Aeronautics and Space Administration.
Funding Information:
We thank the reviewer for the constructive comments. This work is based on observations made with the NASA/ESA/CSA James Webb Space Telescope. The data were obtained from the Mikulski Archive for Space Telescopes at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-03127 for JWST. These observations are associated with program #2473 and can be accessed via doi: 10.17909/9zgc-m183 . Support for program #2743 was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-03127. L.A. acknowledges support of the Canadian Space Agency through contract 22JWGO1-11. T.L.R. would like to acknowledge the support of the NASA Science Mission Directorate under WBS 411672.07.05.05.03.01. This work was authored by employees of Caltech/IPAC under Contract No. 80GSFC21R0032 with the National Aeronautics and Space Administration.
Publisher Copyright:
© 2023. The Author(s). Published by the American Astronomical Society.
PY - 2023/4/1
Y1 - 2023/4/1
N2 - We 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.
AB - We 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.
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U2 - 10.3847/2041-8213/acc86d
DO - 10.3847/2041-8213/acc86d
M3 - Article
AN - SCOPUS:85153886101
SN - 2041-8205
VL - 947
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
IS - 2
M1 - L30
ER -