Tazzari_Bologna_2017_zenodo.pdf (28.63 MB)

A multi-wavelength view of planet forming regions: unleashing the full power of ALMA

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posted on 16.01.2018 by Tazzari Marco
Observations at sub-mm/mm wavelengths allow us to probe the solids in the interior
of protoplanetary disks, where the bulk of the dust is located and planet formation
is expected to occur. However, the actual size of dust grains is still largely
unknown due to the limited angular resolution and sensitivity of past observations.
The upgraded VLA and, especially, the ALMA observatories provide now powerful tools
to resolve grain growth in disks, making the time ripe for developing a
multi-wavelength analysis of sub-mm/mm observations of disks.   

In my contribution I will present a novel analysis method for multi-wavelength
ALMA/VLA observations which, based on the self-consistent modelling of the sub-mm/mm
disk continuum emission, allows us to constrain simultaneously the size distribution
of dust grains and the disk's physical structure (Tazzari et al. 2016, A&A 588 A53).
I will also present the recent analysis of spatially resolved ALMA Band 7
observations of a large sample of disks in the Lupus star forming region, from which
we obtained a tentative evidence of a disk size-disk mass correlation (Tazzari et
al. 2017, arXiv:1707.01499).
Finally, I will introduce galario, a GPU Accelerated Library for the Analysis of
Radio Interferometry Observations. Fitting the observed visibilities in the uv-plane
is computationally demanding: with galario we solve this problem for the current as
well as for the full-science ALMA capabilities by leveraging on the computing power
of GPUs, providing the computational breakthrough needed to fully exploit the new
wealth of information delivered by ALMA.