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Trapping dust particles in the outer regions of protoplanetary disks

Pinilla, P. and Birnstiel, T. and Ricci, L. and Dullemond, C. P. and Uribe, A. L. and Testi, L. and Natta, A. (2012) Trapping dust particles in the outer regions of protoplanetary disks. Astronomy and Astrophysics, 538 . Art. No. A114. ISSN 0004-6361.

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Aims. We attempt to explain grain growth to mm sized particles and their retention in the outer regions of protoplanetary disks, as observed at sub-mm and mm wavelengths, by investigating whether strong inhomogeneities in the gas density profiles can decelerate excessive radial drift and help the dust particles to grow. Methods. We use coagulation/fragmentation and disk-structure models, to simulate the evolution of dust in a bumpy surface density profile, which we mimic with a sinusoidal disturbance. For different values of the amplitude and length scale of the bumps, we investigate the ability of this model to produce and retain large particles on million-year timescales. In addition, we compare the pressure inhomogeneities considered in this work with the pressure profiles that come from magnetorotational instability. Using the Common Astronomy Software Applications ALMA simulator, we study whether there are observational signatures of these pressure inhomogeneities that can be seen with ALMA. Results. We present the conditions required to trap dust particles and the corresponding calculations predicting the spectral slope in the mm-wavelength range, to compare with current observations. Finally, we present simulated images using different antenna configurations of ALMA at different frequencies, to show that the ring structures will be detectable at the distances of either the Taurus Auriga or Ophiucus star-forming regions.

Item Type:Article
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URLURL TypeDescription DOIArticle
Pinilla, P.0000-0001-8764-1780
Testi, L.0000-0003-1859-3070
Additional Information:© 2012 ESO. Article published by EDP Sciences. Received 4 October 2011. Accepted 5 December 2011. Published online 10 February 2012. We acknowledge Francesco Trotta for his help with the code that we used in this work to derive the mm-fluxes. We would like to thank the referee, Wladimir Lyra, for his useful suggestions. This work was supported in part through the third funding line of German Excellence Initiative. T. Birnstiel acknowledges ESO Office for Science that provided funding for the visits to Garching. L. Ricci acknowledges the Ph.D. fellowship of the International Max-Planck-Research School. A. L. Uribe acknowledges the CPU time for running the simulations in the Bluegene/P supercomputer and the THEO cluster at the Rechenzentrum Garching (RZG) of the Max Planck Society. Finally, L. Testi acknowledges the allocation of an ASI contract to the INAF-Osservatorio Astrofisico di Arcetri.
Funding AgencyGrant Number
German Excellence InitiativeUNSPECIFIED
European Southern Observatory (ESO)UNSPECIFIED
International Max-Planck Research School (IMPRS)UNSPECIFIED
Agenzia Spaziale Italiana (ASI)UNSPECIFIED
Subject Keywords:circumstellar matter; accretion, accretion disks; stars: pre-main sequence; planet and satellites: formation; protoplanetary disks
Record Number:CaltechAUTHORS:20120411-092130072
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Official Citation:Trapping dust particles in the outer regions of protoplanetary disks P. Pinilla, T. Birnstiel, L. Ricci, C. P. Dullemond, A. L. Uribe, L. Testi, A. Natta A&A 538 A114 (2012) DOI: 10.1051/0004-6361/201118204
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:30056
Deposited By: Tony Diaz
Deposited On:11 Apr 2012 20:28
Last Modified:22 Nov 2019 23:41

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