2013A&A...560A.103M


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.29CET06:41:23

2013A&A...560A.103M - Astronomy and Astrophysics, volume 560A, 103-103 (2013/12-1)

A Keplerian disk around a Class 0 source: ALMA observations of VLA 1623A.

MURILLO N.M., LAI S.-P., BRUDERER S., HARSONO D. and VAN DISHOECK E.F.

Abstract (from CDS):

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. 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. ALMA Cycle 0 Early Science 1.3mm continuum and C18O (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. The PV diagrams of the C18O line emission suggest the presence of a rotationally supported component with a radius of at least 50AU. Kinematical modeling of the line emission shows that the disk out to 180AU is actually rotationally supported, with the rotation described well by Keplerian rotation out to at least 150AU, and the central source mass is ∼0.2M for an inclination of 55°. Pure infall and conserved angular momentum rotation models are excluded. VLA1623A, a very young Class 0 source, presents a disk with an outer radius Rout=180AU with a Keplerian velocity structure out to at least 150AU. 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.

Abstract Copyright:

Journal keyword(s): stars: formation - ISM: individual objects: VLA1623 - accretion, accretion disks - methods: observational - stars: low-mass - techniques: interferometric

Simbad objects: 14

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Number of rows : 14

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 [JCC87] IRAS 4A2 Y*O 03 29 10.413 +31 13 32.20           ~ 90 1
2 [JCC87] IRAS 4A Y*O 03 29 10.49 +31 13 30.8           ~ 611 1
3 [JCC87] IRAS 4 FIR 03 29 10.9 +31 13 26           ~ 468 0
4 [JCC87] IRAS 4B Y*O 03 29 12.058 +31 13 02.05           ~ 562 0
5 LDN 1527 DNe 04 39 53 +25 45.0           ~ 508 0
6 3C 279 QSO 12 56 11.1664521013 -05 47 21.531840471   18.01 17.75 15.87   ~ 2732 2
7 CRBR 2316.0-1626 Y*? 16 26 17.46816 -24 23 12.9552           ~ 21 0
8 ALMA J162625.63-242429.5 Y*O 16 26 25.62 -24 24 28.9           ~ 28 1
9 NAME rho Oph A Cloud MoC 16 26 26.4 -24 22 33           ~ 241 1
10 NAME VLA 1623-243 Y*O 16 26 26.42 -24 24 30.0           ~ 375 0
11 NAME rho Oph E MoC 16 27 02.0 -24 38 31           ~ 56 0
12 NAME rho Oph B Cloud MoC 16 27 11 -24 28.5           ~ 67 1
13 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3086 0
14 QSO B1730-130 QSO 17 33 02.70578476 -13 04 49.5481484   18 18.5 18.78 17.39 ~ 992 1

    Equat.    Gal    SGal    Ecl

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2020.11.29-06:41:23

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