Absence of Significant Cool Disks in Young Stellar Objects Exhibiting Repetitive Optical Outbursts

Abstract

We report Submillimeter Array (SMA) 1.3 mm high angular resolution observations towards the four EXor type outbursting young stellar objects (YSOs) VY Tau, V1118 Ori, V1143 Ori, and NY Ori. The data mostly show low dust masses $M_{dust}$ in the associated circumstellar disks. Among the sources, NY Ori possesses a relatively massive disk with $M_{dust}\sim 9\times 10^{-4}$ $M_{\odot }$. V1118 Ori has a marginal detection equivalent to $M_{dust}\sim 6\times 10^{-5}$ $M_{\odot }$. V1143 Ori has a non-detection also equivalent to $M_{dust}<6\times 10^{-5}$ $M_{\odot }$. For the nearest source VY Tau, we get a surprising non-detection which provides a stringent upper limit $M_{dust}<6\times 10^{-6}$ $M_{\odot }$. We interpret our findings as suggesting that the gas and dust reservoirs that feed the short duration, repetitive optical outbursts seen in some EXors may be limited to the small scale, innermost region of their circumstellar disks. This hot dust may have escaped our detection limits. Follow-up, more sensitive millimeter observations are needed to improve our understanding of the triggering mechanisms of EXor type outbursts.

6 pages, 1 figure, accepted to ApJL

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Cited by in corpus (11)

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• A likely flyby of binary protostar Z CMa caught in action
• A 1.3 mm SMA Survey of 29 Variable Young Stellar Objects
• A concordant scenario to explain FU Ori from deep centimeter and millimeter interferometric observations
• A "Rosetta Stone" for protoplanetary disks: The synergy of multi-wavelength observations
• The Circumstellar Disk and Asymmetric outflow of the EX Lup Outburst System
• Cold CO gas in the disk of the young eruptive star EX Lup
• A Study of Millimeter Variability in FUor Objects
• The EXor phenomenon