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Testing particle trapping in transition disks with ALMA | | P. Pinilla
; N. van der Marel
; L. M. Pérez
; E. .F. van Dishoeck
; S. Andrews
; T. Birnstiel
; G. Herczeg
; K. M. Pontoppidan
; T. van Kempen
; | | Date: |
10 Sep 2015 | | Abstract: | We present new ALMA continuum observations at 336 GHz of two transition
disks, SR 21 and HD 135344B. In combination with previous ALMA observations
from Cycle 0 at 689 GHz, we compare the visibility profiles at the two
frequencies and calculate the spectral index ($alpha_{
m{mm}}$). The
observations of SR 21 show a clear shift in the visibility nulls, indicating
radial variations of the inner edge of the cavity at the two wavelengths.
Notable radial variations of the spectral index are also detected for SR 21
with values of $alpha_{
m{mm}}sim3.8-4.2$ in the inner region ($rlesssim35$
AU) and $alpha_{
m{mm}}sim2.6-3.0$ outside. An axisymmetric ring ("ring
model") or a ring with the addition of an azimuthal Gaussian profile, for
mimicking a vortex structure ("vortex model"), is assumed for fitting the disk
morphology. For SR 21, the ring model better fits the emission at 336 GHz,
conversely the vortex model better fits the 689 GHz emission. For HD 135344B,
neither a significant shift in the null of the visibilities nor radial
variations of $alpha_{
m{mm}}$ are detected. Furthermore, for HD 135344B, the
vortex model fits both frequencies better than the ring model. However, the
azimuthal extent of the vortex increases with wavelength, contrary to model
predictions for particle trapping by anticyclonic vortices. For both disks, the
azimuthal variations of $alpha_{
m{mm}}$ remain uncertain to confirm
azimuthal trapping. The comparison of the current data with a generic model of
dust evolution that includes planet-disk interaction suggests that particles in
the outer disk of SR 21 have grown to millimetre sizes and have accumulated in
a radial pressure bump, whereas with the current resolution there is not clear
evidence of radial trapping in HD 135344B, although it cannot be excluded
either. | | Source: | arXiv, 1509.3040 | | Services: | Forum | Review | PDF | Favorites | |
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