Circumbinary Ring, Circumstellar disks and accretion in the binary system UY Aurigae
Ya-Wen Tang, Anne Dutrey, Stephane Guilloteau, Vincent Pietu, Emmanuel, Di Folco, Tracy Beck, Paul T. P. Ho, Yann Boehler, Frederic Gueth, Jeff Bary,, and Michal Simon

TL;DR
This study confirms the presence of a circumbinary disk in UY Aurigae, resolves circumstellar disks, and reveals complex gas dynamics indicating active accretion and possible multiplicity within the system.
Contribution
It provides detailed observational evidence of the UY Aurigae system's disk structures and gas kinematics, suggesting active accretion and potential multiplicity, which advances understanding of binary star evolution.
Findings
Confirmed existence of a circumbinary disk in UY Aurigae.
Resolved circumstellar disks at 1.4 mm with low spectral indices.
Detected complex gas motions including infall, outflow, and streaming accretion.
Abstract
Recent exo-planetary surveys reveal that planets can orbit and survive around binary stars. This suggests that some fraction of young binary systems which possess massive circumbinary disks (CB) may be in the midst of planet formation. However, there are very few CB disks detected. We revisit one of the known CB disks, the UY Aurigae system, and probe 13CO 2-1, C18O 2-1, SO 5(6)-4(5) and 12CO 3-2 line emission and the thermal dust continuum. Our new results confirm the existence of the CB disk. In addition, the circumstellar (CS) disks are clearly resolved in dust continuum at 1.4 mm. The spectral indices between the wavelengths of 0.85 mm and 6 cm are found to be surprisingly low, being 1.6 for both CS disks. The deprojected separation of the binary is 1.26" based on our 1.4 mm continuum data. This is 0.07" (10 AU) larger than in earlier studies. Combining the fact of the variation of…
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