2014A&A...562A..77H


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.23CEST01:04:41

2014A&A...562A..77H - Astronomy and Astrophysics, volume 562A, 77-77 (2014/2-1)

Rotationally-supported disks around Class I sources in Taurus: disk formation constraints.

HARSONO D., JORGENSEN J.K., VAN DISHOECK E.F., HOGERHEIJDE M.R., BRUDERER S., PERSSON M.V. and MOTTRAM J.C.

Abstract (from CDS):

Disks are observed around pre-main sequence stars, but how and when they form is still heavily debated. While disks around young stellar objects have been identified through thermal dust emission, spatially and spectrally resolved molecular line observations are needed to determine their nature. Only a handful of embedded rotationally supported disks have been identified to date. We identify and characterize rotationally supported disks near the end of the main accretion phase of low-mass protostars by comparing their gas and dust structures. Subarcsecond observations of dust and gas toward four Class I low-mass young stellar objects in Taurus are presented at significantly higher sensitivity than previous studies. The 13CO and C18O J=2-1 transitions at 220GHz were observed with the Plateau de Bure Interferometer at a spatial resolution of ≤0.8'' (56AU radius at 140pc) and analyzed using uv-space position velocity diagrams to determine the nature of their observed velocity gradient. Rotationally supported disks (RSDs) are detected around 3 of the 4 Class I sources studied. The derived masses identify them as Stage I objects; i.e., their stellar mass is higher than their envelope and disk masses. The outer radii of the Keplerian disks toward our sample of Class I sources are ≤100AU. The lack of on-source C18O emission for TMR1 puts an upper limit of 50AU on its size. Flattened structures at radii >100AU around these sources are dominated by infalling motion (υ∝r–1). A large-scale envelope model is required to estimate the basic parameters of the flattened structure from spatially resolved continuum data. Similarities and differences between the gas and dust disk are discussed. Combined with literature data, the sizes of the RSDs around Class I objects are best described with evolutionary models with an initial rotation of Ω=10–14Hz and slow sound speeds. Based on the comparison of gas and dust disk masses, little CO is frozen out within 100AU in these disks. Rotationally supported disks with radii up to 100AU are present around Class I embedded objects. Larger surveys of both Class 0 and I objects are needed to determine whether most disks form late or early in the embedded phase.

Abstract Copyright:

Journal keyword(s): stars: low-mass - techniques: interferometric - stars: protostars - accretion, accretion disks - ISM: molecules - disks protoplanetary

Simbad objects: 25

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Number of rows : 25

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 4C 28.07 QSO 02 37 52.40567732 +28 48 08.9900231     18.5 16.99   ~ 486 1
2 3C 84 Sy2 03 19 48.1597607660 +41 30 42.114155434   13.10 12.48 11.09   ~ 3461 3
3 [JCC87] IRAS 4A2 Y*O 03 29 10.413 +31 13 32.20           ~ 73 1
4 QSO B0400+258 QSO 04 03 05.58606763 +26 00 01.5028075     18 19.00   ~ 176 1
5 IRAS 04016+2610 Y*O 04 04 43.071 +26 18 56.39     20.45     ~ 228 0
6 LDN 1489 DNe 04 04 47.5 +26 19 42           ~ 190 0
7 2MASS J04314444+1808315 Y*O 04 31 44.447 +18 08 31.54           ~ 140 1
8 IRAS 04295+2251 Y*O 04 32 32.055 +22 57 26.67           K0-M4 83 0
9 LDN 1536 DNe 04 33 24.6 +22 43 29           ~ 92 0
10 IRAS 04361+2547 Y*O 04 39 13.898 +25 53 20.63           ~ 183 1
11 IRAS 04365+2535 Y*O 04 39 35.194 +25 41 44.73           ~ 227 0
12 LDN 1527 DNe 04 39 53 +25 45.0           ~ 469 0
13 NAME Taurus Dark Cloud SFR 04 41.0 +25 52           ~ 3310 0
14 IRAS 04381+2540 Y*O 04 41 12.679 +25 46 35.42           K0-M2 118 2
15 Barnard 220 DNe 04 41 38.8 +26 00 42           ~ 119 0
16 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1326 0
17 LDN 1534 DNe 04 41 46 +25 41.4           ~ 42 0
18 ICRF J050258.4+251625 AGN 05 02 58.47478439 +25 16 25.2761557   20       ~ 155 1
19 QSO B0507+179 QSO 05 10 02.36912982 +18 00 41.5816534   20.0 19.0 19.09   ~ 276 1
20 NAME VLA 1623-243 Y*O 16 26 26.42 -24 24 30.0           ~ 366 0
21 Elia 2-29 Y*O 16 27 09.43032 -24 37 18.7716           ~ 260 1
22 YLW 15 Y*O 16 27 26.93640 -24 40 50.8224           ~ 232 1
23 IRAS 16285-2355 Y*O 16 31 35.65752 -24 01 29.4708           ~ 101 0
24 [NWA2005] SMM 1B Y*O 19 01 56.41 -36 57 28.0           ~ 77 1
25 NAME BL Lac BLL 22 02 43.2913773726 +42 16 39.978417860   15.66 14.72     ~ 1975 1

    Equat.    Gal    SGal    Ecl

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2019.10.23-01:04:41

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