C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST01:26:29

2014A&A...566A..73C - Astronomy and Astrophysics, volume 566A, 73-73 (2014/6-1)

Imaging the disk around IRAS 20126+4104 at subarcsecond resolution.


Abstract (from CDS):

The existence of disks around high-mass stars has yet to be established on a solid ground, as only few reliable candidates are known to date. The disk rotating about the ∼104L protostar IRAS20126+4104 is probably the most convincing of these. We would like to resolve the disk structure in IRAS20126+4104 and, if possible, investigate the relationship between the disk and the associated jet emitted along the rotation axis. We performed observations at 1.4mm with the IRAM Plateau de Bure interferometer attaining an angular resolution of ∼0.4" (∼660AU). We imaged the methyl cyanide J=12->11 ground state and vibrationally excited transitions as well as the CH313CN isotopologue, which had proved to be disk tracers. Our findings confirm the existence of a disk rotating about a ∼7-10M star in IRAS20126+4104, with rotation velocity increasing at small radii. The dramatic improvement in sensitivity and spectral and angular resolution with respect to previous observations allows us to establish that higher excitation transitions are emitted closer to the protostar than the ground state lines, which demonstrates that the gas temperature is increasing towards the centre. We also find that the material is asymmetrically distributed in the disk and speculate on the possible origin of such a distribution. Finally, we demonstrate that the jet emitted along the disk axis is co-rotating with the disk. We present iron-clad evidence of the existence of a disk undergoing rotation around a B-type protostar, with rotation velocity increasing towards the centre. We also demonstrate that the disk is not axially symmetric. These results prove that B-type stars may form through disk-mediated accretion as their low-mass siblings do, but also show that the disk structure may be significantly perturbed by tidal interactions with (unseen) companions, even in a relatively poor cluster such as that associated with IRAS20126+4104.

Abstract Copyright:

Journal keyword(s): stars: formation - ISM: jets and outflows - ISM: individual objects: IRAS 20126+4104

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 V* AB Aur Ae* 04 55 45.8459978418 +30 33 04.293281305 7.20 7.16 7.05 6.96 6.70 A0Ve 931 2
2 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5320 1
3 IRAS 16245-2423 TT* 16 27 37.1911764648 -24 30 35.031583716       16.66 14.67 B5-F2 235 0
4 IRAS 18449-0115 cor 18 47 34.4947 -01 12 40.269           ~ 312 0
5 IRAS 20126+4104 Y*O 20 14 25.8816186803 +41 13 36.869078243           B2.5-B0.5 396 0
6 QSO J2015+371 BLL 20 15 28.72976962 +37 10 59.5148505     21.82 21.4   ~ 243 2
7 EM* MWC 349 ** 20 32 45.499080 +40 39 36.74124   15.88 13.15 12.13   Bep 707 0

    Equat.    Gal    SGal    Ecl

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