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Tidal Interaction between the UX Tauri A/C Disk System Revealed by ALMA

AuthorsZapata, Luis A.; Rodríguez, Luis F.; Fernández-López, M.; Palau, Aina ; Estalella, Robert; Osorio Gutiérrez, Mayra Carolina ; Anglada, Guillem ; Huelamo, Nuria
KeywordsInterstellar molecules
Radio interferometry
Circumstellar gas
Issue DateJun-2020
PublisherIOP Publishing
CitationAstrophysical Journal 896(2): 132 (2020)
AbstractWe present sensitive and high angular-resolution (similar to 02-03) (sub)millimeter (230 and 345 GHz) continuum and CO(2-1)/CO(3-2) line archive observations of the disk star system in UX Tauri carried out with the Atacama Large Millimeter/Submillimeter Array. These observations reveal the gas and dusty disk surrounding the young star UX Tauri A with a large signal-to-noise ratio (>400 in the continuum and >50 in the line), and for the first time we detect the molecular gas emission associated with the disk of UX Tauri C (with a size for the disk of <56 au). No (sub)millimeter continuum emission is detected at the 5 sigma level (0.2 mJy at 0.85 mm) associated with UX Tauri C. For the component UX Tauri C, we estimate a dust disk mass of <= 0.05M(circle plus). Additionally, we report a strong tidal disk interaction between both disks, UX Tauri A/C, separated 360 au in projected distance. The CO line observations reveal marked spiral arms in the disk of UX Tauri A and an extended redshifted stream of gas associated with the UX Tauri C disk. No spiral arms are observed in the dust continuum emission of UX Tauri A. Assuming a Keplerian rotation we estimate the enclosed masses (disk+star) from their radial velocities in 1.4 0.6Mfor UX Tauri A, and 70 30/siniJupiter masses for UX Tauri C (the latter coincides with the mass upper limit value for a brown dwarf). The observational evidence presented here lead us to propose that UX Tauri C has a close approach of a possible wide, evolving, and eccentric orbit around the disk of UX Tauri A, causing the formation of spiral arms and a stream of molecular gas falling toward UX Tauri C. © 2020. The American Astronomical Society. All rights reserved.
Publisher version (URL)http://dx.doi.org/10.3847/1538-4357/ab8fac
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