ALMA Observations of Young Eruptive Stars: continuum disk sizes and molecular outflows

Abstract

We present Atacama Large Millimeter/submillimeter Array (ALMA) 1.3 mm observations of four young, eruptive star-disk systems at 0.4" resolution: two FUors (V582 Aur and V900 Mon), one EXor (UZ Tau E) and one source with an ambiguous FU/EXor classification (GM Cha). The disks around GM Cha, V900 Mon and UZ Tau E are resolved. These observations increase the sample of FU/EXors observed at sub-arcsecond resolution by 15%. The disk sizes and masses of FU/EXors objects observed by ALMA so far suggest that FUor disks are more massive than Class 0/I disks in Orion and Class II disks in Lupus of similar size. EXor disks in contrast do not seem to be distinguishable from these two populations. We reach similar conclusions when comparing the FU/EXor sample to the Class I and Class II disks in Ophiuchus. FUor disks around binaries are host to more compact disks than those in single-star systems, similar to non-eruptive young disks. We detect a wide-angle outflow around GM Cha in ${}^{12}$CO emission, wider than typical Class I objects and more similar to those found around some FUor objects. We use radiative transfer models to fit the continuum and line data of the well-studied disk around UZ Tau E. The line data is well described by a keplerian disk, with no evidence of outflow activity (similar to other EXors). The detection of wide-angle outflows in FUors and not in EXors support to the current picture in which FUors are more likely to represent an accretion burst in the protostellar phase (Class I), while EXors are smaller accretion events in the protoplanetary (Class II) phase.

arXiv comment22 pages, 14 figures. Accepted for publication in ApJ

References in corpus (62)

• Astropy: A Community Python Package for Astronomy
• emcee: The MCMC Hammer
• Gaia Data Release 2. Summary of the contents and survey properties
• Spectral Energy Distributions of T Tauri Stars With Passive Circumstellar Disks
• The Spitzer c2d Legacy Results: Star Formation Rates and Efficiencies; Evolution and Lifetimes
• Protoplanetary Disks and Their Evolution
• ALMA Survey of Lupus Protoplanetary Disks I: Dust and Gas Masses
• Gaps and Rings in an ALMA Survey of Disks in the Taurus Star-forming Region
• Dynamical Masses of T Tauri Stars and Calibration of PMS Evolution
• Protoplanetary Disk Structures in Ophiuchus II: Extension to Fainter Sources
• ALMA Survey of Lupus Protoplanetary Disks II: Gas Disk Radii
• Episodic accretion in magnetically layered protoplanetary discs
• On the diversity and statistical properties of protostellar discs
• The Evolution of Outflow-Envelope Interactions in Low-Mass Protostars
• A Parametric Modeling Approach to Measuring the Gas Masses of Circumstellar Disks
• Imaging the water-snow line during a protostellar outburst
• The Ophiuchus DIsc Survey Employing ALMA (ODISEA) - I : project description and continuum images at 28 au resolution
• A Millimeter Continuum Size-Luminosity Relationship for Protoplanetary Disks
• Variable protostellar accretion with episodic bursts
• Lupus disks with faint CO isotopologues: low gas/dust or large carbon depletion?
• 2-D simulations of FU Orionis disk outbursts
• A Near-IR Spectroscopic Survey of FU Orionis Objects
• GALARIO: a GPU Accelerated Library for Analysing Radio Interferometer Observations
• Scaling Relations Associated with Millimeter Continuum Sizes in Protoplanetary Disks
• Massive planets in FU Orionis discs: implications for thermal instability models
• Flybys in protoplanetary discs: I. Gas and dust dynamics
• Transport of CO in Protoplanetary Disks: Consequences of Pebble Formation, Settling, and Radial Drift
• Planet formation signposts: observability of circumplanetary disks via gas kinematics
• CO destruction in protoplanetary disk midplanes: inside versus outside the CO snow surface
• The Degree of Alignment Between Circumbinary Disks and Their Binary Hosts
• Unlocking CO Depletion in Protoplanetary Disks I. The Warm Molecular Layer
• Gas vs dust sizes of protoplanetary disks: effects of dust evolution
• Observational constraints on dust disk sizes in tidally truncated protoplanetary disks in multiple systems in the Taurus region
• HOPS 383: An Outbursting Class 0 Protostar in Orion
• Distances and Kinematics of Gould Belt Star-Forming Regions with Gaia DR2 results
• Outflows, infall and evolution of a sample of embedded low-mass protostars. The William Herschel Line Legacy (WILL) survey
• Cloudlet capture by Transitional Disk and FU Orionis stars
• Periodic accretion from a circumbinary disk in the young binary UZ Tau E
• Observability of planet-disc interactions in CO kinematics
• The ALMA early science view of FUor/EXor objects - V: continuum disc masses and sizes
• EX Lupi in quiescence
• Resolving the FU Ori System with ALMA: Interacting Twin Disks?
• The JCMT Transient Survey: Stochastic and Secular Variability of Protostars and Disks In the Sub-Millimeter Observed Over Eighteen Months
• On the millimetre continuum flux-radius correlation of proto-planetary discs
• The Differential Rotation of FU Ori
• The ALMA Early Science view of FUor/EXor objects. I. Through the looking-glass of V2775 Ori
• High Precision Dynamical Masses of Pre-Main Sequence Stars with ALMA and Gaia
• The ALMA Early Science View of FUor/EXor objects. II. The Very Wide Outflow Driven by HBC 494
• A 1.3 mm SMA Survey of 29 Variable Young Stellar Objects
• The Millimeter Continuum Size-Frequency Relationship in the UZ Tau E Disk
• The Early ALMA View of the FU Ori Outburst System
• The ALMA Early Science View of FUor/EXor objects. III. The Slow and Wide Outflow of V883 Ori
• Diagnosing 0.1-10 au scale morphology of the FU\,Ori disk using ALMA and VLTI/GRAVITY
• The ALMA Early Science View of FUor/EXor objects. IV. Misaligned Outflows in the Complex Star-forming Environment of V1647 Ori and McNeil's Nebula
• An infrared view of the EXor variables: on the case of V1118 ORI
• Mass transport from the envelope to the disk of V346 Nor: a case study for the luminosity problem in an FUor-type young eruptive star
• An UXor among FUors: extinction related brightness variations of the young eruptive star V582 Aur
• The Circumstellar Disk and Asymmetric outflow of the EX Lup Outburst System
• Photometric and spectroscopic variability of the FUor star V582 Aurigae
• An ALMA Study of the FU-Ori Type Object V900 Mon: Implications for the Progenitor
• Filamentary Structures and Star Formation Activities in the Sites S234, V582, and IRAS 05231+3512
• The weakening outburst of the young eruptive star V582 Aur

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• Molecular Mapping of DR Tau's Protoplanetary Disk, Envelope, Outflow, and Large-Scale Spiral Arm
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• PRODIGE -- Planet-forming disks in Taurus with NOEMA. I. Overview and first results for 12CO, 13CO, and C18O
• Resolving the Binary Components of the Outbursting Protostar HBC 494 with ALMA
• Molecular inventory of a young eruptive star's environment -- Case study of the classical FU Orionis star V1057 Cyg
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