ALMA 0.88 mm Survey of Disks around Planetary-mass Companions

Characterizing the physical properties and compositions of circumplanetary disks can provide important insights into the formation of giant planets and satellites. We report Atacama Large Millimeter/submillimeter Array 0.88 mm (Band 7) continuum observations of six planetary-mass (10-20 MJup) compan...

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Bibliographic Details
Published in:The Astronomical journal 2020-05, Vol.159 (5), p.229
Main Authors: Wu, Ya-Lin, Bowler, Brendan P., Sheehan, Patrick D., Andrews, Sean M., Herczeg, Gregory J., Kraus, Adam L., Ricci, Luca, Wilner, David J., Zhu, Zhaohuan
Format: Article
Language:English
Subjects:
Accretion disks
Astronomy
Binary stars
Circumstellar disks
Companion stars
Extrasolar gas giants
Fluxes
Physical properties
Planet formation
Protoplanetary disks
Radial drift
Radio interferometry
Radio telescopes
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Summary:Characterizing the physical properties and compositions of circumplanetary disks can provide important insights into the formation of giant planets and satellites. We report Atacama Large Millimeter/submillimeter Array 0.88 mm (Band 7) continuum observations of six planetary-mass (10-20 MJup) companions: CT Cha b, 1RXS 1609 b, ROXs 12 b, ROXs 42B b, DH Tau b, and FU Tau b. No continuum sources are detected at the locations of the companions down to 3 limits of 120-210 Jy. Given these nondetections, it is not clear whether disks around planetary-mass companions indeed follow the disk-flux-host-mass trend in the stellar regime. The faint radio brightness of these companion disks may result from a combination of fast radial drift and a lack of dust traps. Alternatively, as disks in binary systems are known to have significantly lower millimeter fluxes due to tidal interactions, these companion disks may instead follow the relationship of moderate-separation binary stars. This scenario can be tested with sensitive continuum imaging at rms levels of 10 Jy.
ISSN:0004-6256
1538-3881
DOI:10.3847/1538-3881/ab818c