A Keplerian disk around a Class 0 source: ALMA observations of VLA1623A
By N. Murillo, S. Lai, Simon Bruderer, D. Harsono, E. F. V. D. E. Garching, National Tsing hua University, Asiaa, L. Observatory, Sron. 2013
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Context. Rotationally supported disks are critical in the star formation process. The questions of when they form and what factors influence or hinder their formation have been studied but are largely unanswered. Observations of early-stage YSOs are needed to probe disk formation. Aims: VLA1623 is a triple non-coeval protostellar system, with a weak magnetic field perpendicular to the outflow, whose Class 0 component, VLA1623A, shows a disk-like structure in continuum with signatures of rotation in line emission. We aim to determine whether this structure is in part or in whole a rotationally supported disk, i.e. a Keplerian disk, and what its characteristics are. Methods: ALMA Cycle 0 Early Science 1.3 mm continuum and C$^{18}$O (2-1) observations in the extended configuration are presented here and used to perform an analysis of the disk-like structure using position-velocity (PV) diagrams and thin disk modeling with the addition of foreground absorption. Results: The PV diagrams of the C$^{18}$O line emission suggest the presence of a rotationally supported component with a radius of at least 50 AU. Kinematical modeling of the line emission shows that the disk out to 180 AU is actually rotationally supported, with the rotation described well by Keplerian rotation out to at least 150 AU, and the central source mass is ~{}0.2 M$_{⊙}$ for an inclination of 55{deg}. Pure infall and conserved angular momentum rotation models are excluded. Conclusions: VLA1623A, a very young Class 0 source, presents a disk with an outer radius R$_{out}$ = 180 AU with a Keplerian velocity structure out to at least 150 AU. The weak magnetic fields and recent fragmentation in this region of {$ρ$} Ophiuchus may have played a leading role in the formation of the disk. Appendices are available in electronic form at http://www.aanda.org
Subfields: Astronomy and Astrophysics
View Paper: https://www.semanticscholar.org/paper/abeb171079f2d74c2ddd377084726a8f80018244
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In Astronomy and Astrophysics
Citations in the corpus
- The VLA/ALMA Nascent Disk and Multiplicity (VANDAM) Survey of Orion Protostars. II. A Statistical Characterization of Class 0 and Class I Protostellar Disks (2020, background): “Furthermore, a number of new Class 0 disks have been identified and confirmed to be rotationally supported (Murillo et al. 2013; Codella et al. 2014; Lindberg et al. 2014; Yen et al. 2017; Alves et al. 2018), and some very small Class 0 disks have also been identified (Yen et al. 2015; Hsieh et al.…”
- Accretion onto Pre-Main-Sequence Stars (2016, background): “…properties is usually quite difficult owing to high extinction, it may be possible to measure protostellar masses from the kinematics of infalling envelopes and/or circumstellar disks (Tobin et al. 2012, Murillo et al. 2013, Ohashi et al. 2014) and thus provide a robust test of these models.”
- Accretion disks in luminous young stellar objects (2015, result): “…with Keplerian rotation (e.g., Simon et al., 2000; Piétu et al., 2007), even for the youngest Class 0 objects, as recently confirmed by CARMA and ALMA observations (L1527 IRS: Tobin et al., 2012; Ohashi et al., 2014; VLA 1623: Murillo et al., 2013; HH 212: Lee et al., 2014; Codella et al., 2014).”
- On the diversity and statistical properties of protostellar discs (2018, background): “…L1527 with a disc radius of≈ 70 au (Tobin et al. 2012; Ohashi et al. 2014; Aso et al. 2017), VLA 1623 with a disc radius of ≈ 190 au (Murillo & Lai 2013; Murillo et al. 2013), TMC-1A with a disc radius ∼ 100 au (Yen et al. 2013; Harsono et al. 2014; Aso et al. 2015), HH212 with a disc radius ≈…”