ALMA Discovery of a Disk around the Planetary-mass Companion SR 12 c

Abstract We report an Atacama Large Millimeter/submillimeter Array 0.88 mm (Band 7) continuum detection of the accretion disk around SR 12 c, an ∼11 M Jup planetary-mass companion (PMC) orbiting its host binary at 980 au. This is the first submillimeter detection of a circumplanetary disk around a w...

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Bibliographic Details
Published in:Astrophysical journal. Letters 2022-05, Vol.930 (1), p.L3
Main Authors: Wu, Ya-Lin, Bowler, Brendan P., Sheehan, Patrick D., Close, Laird M., Eisner, Joshua A., Best, William M. J., Ward-Duong, Kimberly, Zhu, Zhaohuan, Kraus, Adam L.
Format: Article
Language:English
Subjects:
Accretion
Accretion disks
Dust
Dust emission
Extrasolar gaseous giant planets
Extrasolar planets
Flux density
Radio continuum emission
Radio interferometry
Radio telescopes
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Summary:Abstract We report an Atacama Large Millimeter/submillimeter Array 0.88 mm (Band 7) continuum detection of the accretion disk around SR 12 c, an ∼11 M Jup planetary-mass companion (PMC) orbiting its host binary at 980 au. This is the first submillimeter detection of a circumplanetary disk around a wide PMC. The disk has a flux density of 127 ± 14 μ Jy and is not resolved by the ∼0.″1 beam, so the dust disk radius is likely less than 5 au and can be much smaller if the dust continuum is optically thick. If, however, the dust emission is optically thin, then the SR 12 c disk has a comparable dust mass to the circumplanetary disk around PDS 70 c but is about five times lower than that of the ∼12 M Jup free-floating OTS 44. This suggests that disks around bound and unbound planetary-mass objects can span a wide range of masses. The gas mass estimated with an accretion rate of 10 −11 M ☉ yr −1 implies a gas-to-dust ratio higher than 100. If cloud absorption is not significant, a nondetection of 12 CO(3–2) implies a compact gas disk around SR 12 c. Future sensitive observations may detect more PMC disks at 0.88 mm flux densities of ≲100 μ Jy.
ISSN:2041-8205
2041-8213
DOI:10.3847/2041-8213/ac6420