2012A&A...547A..84T


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.17CEST13:42:54

2012A&A...547A..84T - Astronomy and Astrophysics, volume 547A, 84-84 (2012/11-1)

The circumstellar disk of AB Aurigae: evidence for envelope accretion at late stages of star formation?

TANG Y.-W., GUILLOTEAU S., PIETU V., DUTREY A., OHASHI N. and HO P.T.P.

Abstract (from CDS):

The circumstellar disk of AB Aurigae has garnered strong attention owing to the apparent existence of spirals at a relatively young stage and also the asymmetric disk traced in thermal dust emission. However, the physical conditions of the spirals are still not well understood. The origin of the asymmetric thermal emission is unclear. We observed the disk at 230GHz (1.3mm) in both the continuum and the spectral line 12CO J=2->1 with IRAM 30-m, the Plateau de Bure interferometer, and the SubMillimeter Array to sample all spatial scales from 0.37" to about 50''. To combine the data obtained from these telescopes, several methods and calibration issues were checked and discussed. The 1.3mm continuum (dust) emission is resolved into inner disk and outer ring. The emission from the dust ring is highly asymmetric in azimuth, with intensity variations by a factor 3. Molecular gas at high velocities traced by the CO line is detected next to the stellar location. The inclination angle of the disk is found to decrease toward the center. On a larger scale, based on the intensity weighted dispersion and the integrated intensity map of 12CO J=2->1, four spirals are identified, where two of them are also detected in the near infrared. The total gas mass of the 4 spirals (Mspiral) is 10–7<Mspiral<10–5M, which is 3 orders of magnitude smaller than the mass of the gas ring. Surprisingly, the CO gas inside the spiral is apparently counter-rotating with respect to the CO disk, and it only exhibits small radial motion. The wide gap, the warped disk, and the asymmetric dust ring suggest that there is an undetected companion with a mass of 0.03M at a radius of 45 AU. The different spirals would, however, require multiple perturbing bodies. While viable from an energetic point of view, this mechanism cannot explain the apparent counter-rotation of the gas in the spirals. Although an hypothetical fly-by cannot be ruled out, the most likely explanation of the AB Aurigae system may be inhomogeneous accretion well above or below the main disk plane from the remnant envelope, which can explain both the rotation and large-scale motions detected with the 30-m image.

Abstract Copyright:

Journal keyword(s): protoplanetary disks - stars: formation - stars: individual: AB Aurigae - planet-disk interactions

CDS comments: Spiral arms S1 to S8 not in Simbad.

Simbad objects: 15

goto Full paper

goto View the reference in ADS

Number of rows : 15

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 3C 111 Sy1 04 18 21.2773655604 +38 01 35.801523843   19.75 18.05     ~ 839 1
2 V* V1213 Tau Or* 04 31 37.472 +18 12 24.48   19.78       K7 505 0
3 V* GG Tau TT* 04 32 30.3318954228 +17 31 40.834888327 14.84 14.78 13.40 11.54   M0e+M2.0e 615 1
4 EM* LkCa 15 TT* 04 39 17.7912813350 +22 21 03.387667491   13.01 12.03 11.61   K5:Ve 520 1
5 LDN 1527 DNe 04 39 53 +25 45.0           ~ 468 0
6 V* AB Aur Ae* 04 55 45.8459978418 +30 33 04.293281305 7.20 7.16 7.05 6.96 6.70 A0Ve 898 2
7 2MASS J04555605+3036209 TT* 04 55 56.0661543354 +30 36 20.447548655   16.6       M4.0 23 0
8 LDN 1544 DNe 05 04 16.6 +25 10 48           ~ 652 0
9 NAME [BM89] L1544 cor 05 04 22.5 +25 11 36           ~ 434 1
10 V* RW Aur TT* 05 07 49.538 +30 24 05.07   10.86 9.60 9.95   K1/5e+K5e 695 0
11 HD 36112 Ae* 05 30 27.5286772598 +25 19 57.082162439   8.57 8.27     A8Ve 324 0
12 * bet Pic PM* 05 47 17.0876901 -51 03 59.441135 4.13 4.03 3.86 3.74 3.58 A6V 1597 1
13 CPD-36 6759 Y*O 15 15 48.4459023859 -37 09 16.026315179   9.21 8.708     F8V 328 1
14 EM* MWC 349 Em* 20 32 45.6328 +40 39 36.143   15.88 13.15 12.13   Bep 689 1
15 3C 454.3 QSO 22 53 57.74798 +16 08 53.5611   16.57 16.10 15.22   ~ 2439 2

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2012A&A...547A..84T and select 'bookmark this link' or equivalent in the popup menu


2019.10.17-13:42:54

© Université de Strasbourg/CNRS

    • Contact