2015ApJ...813...76M


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.21CEST15:21:45

2015ApJ...813...76M - Astrophys. J., 813, 76 (2015/November-1)

Compact dust concentration in the MWC 758 protoplanetary disk.

MARINO S., CASASSUS S., PEREZ S., LYRA W., ROMAN P.E., AVENHAUS H., WRIGHT C.M. and MADDISON S.T.

Abstract (from CDS):

The formation of planetesimals requires that primordial dust grains grow from micron- to kilometer-sized bodies. Dust traps caused by gas pressure maxima have been proposed as regions where grains can concentrate and grow fast enough to form planetesimals, before radially migrating onto the star. We report new VLA Ka and Ku observations of the protoplanetary disk around the Herbig Ae/Be star MWC 758. The Ka image shows a compact emission region in the outer disk, indicating a strong concentration of big dust grains. Tracing smaller grains, archival ALMA data in band 7 continuum shows extended disk emission with an intensity maximum to the northwest of the central star, which matches the VLA clump position. The compactness of the Ka emission is expected in the context of dust trapping, as big grains are trapped more easily than smaller grains in gas pressure maxima. We develop a nonaxisymmetric parametric model inspired by a steady-state vortex solution with parameters adequately selected to reproduce the observations, including the spectral energy distribution. Finally, we compare the radio continuum with SPHERE scattered light data. The ALMA continuum spatially coincides with a spiral-like feature seen in scattered light, while the VLA clump is offset from the scattered light maximum. Moreover, the ALMA map shows a decrement that matches a region devoid of scattered polarized emission. Continuum observations at a different wavelength are necessary to conclude whether the VLA-ALMA difference is an opacity or a real dust segregation.

Abstract Copyright:

Journal keyword(s): planet-disk interactions - protoplanetary disks - techniques: interferometric

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 EM* LkHA 330 TT* 03 45 48.2804487421 +32 24 11.851014679   12.30 10.97     F7 121 0
2 ICRF J052109.8+163822 Sy1 05 21 09.88592749 +16 38 22.0517668   19.37 18.84 18.480   ~ 756 1
3 HD 36112 Ae* 05 30 27.5286772598 +25 19 57.082162439   8.57 8.27     A8Ve 363 0
4 NVSS J054734+272157 Rad 05 47 34.14892109 +27 21 56.8425667           ~ 34 1
5 HD 134888 * 15 13 27.9630554600 -33 08 50.205245006   9.21 8.74     F3/5V 27 0
6 HD 142527 Ae* 15 56 41.8888096574 -42 19 23.245384377   9.04 8.34     F6III 479 1
7 EM* SR 21A TT* 16 27 10.2776332501 -24 19 12.620553212   16.08 14.10     G1 234 1
8 IRAS 16245-2423 TT* 16 27 37.1911764648 -24 30 35.031583716       16.66 14.67 B5-F2 237 0

    Equat.    Gal    SGal    Ecl

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2020.10.21-15:21:45

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