Quick Search:

uzh logo
Browse by:


Zurich Open Repository and Archive

Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-48264

Podolak, M; Mayer, L; Quinn, T (2011). Evolution of coated grains in spiral shocks of self-gravitating protoplanetary disks. Astrophysical Journal, 734(1):56.

Accepted Version
PDF (Version 1)

View at publisher
Accepted Version
PDF (Version 2)


We investigate the evolution of grains composed of an ice shell surrounding an olivine core as they pass through a spiral shock in a protoplanetary disk. We use published three-dimensional radiation-hydrodynamics simulations of massive self-gravitating protoplanetary disks to extract the thermodynamics of spiral shocks in the region between 10 and 20 AU from the central star. As the density wave passes, it heats the grains, causing them to lose their ice shell and resulting in a lowering of the grain opacity. In addition, since grains of different sizes will have slightly different temperatures, there will be a migration of ice from hotter grains to cooler ones. The rate of migration depends on the temperature of the background gas, so a grain distribution that is effectively stable for low temperatures can undergo an irreversible change in opacity if the gas is temporarily heated to above ~150 K. We find that the opacity can drop more and at a significantly faster rate throughout the spiral shocks relative to the prediction of the standard dust grain model adopted in hydrodynamical calculations of protoplanetary disks. This would lead to faster gas cooling within spiral arms. We discuss the implications of our results on the susceptibility of disks to fragment into sub-stellar objects at distances of a few tens of astronomical units.


3 citations in Web of Science®
3 citations in Scopus®
Google Scholar™



24 downloads since deposited on 18 Feb 2012
9 downloads since 12 months

Detailed statistics

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
Dewey Decimal Classification:530 Physics
Date:June 2011
Deposited On:18 Feb 2012 10:45
Last Modified:11 Jun 2014 22:34
Publisher:IOP Publishing
ISSN:0004-637X (P) 1538-4357 (E)
Publisher DOI:10.1088/0004-637X/734/1/56
Related URLs:http://arxiv.org/abs/1012.5269

Users (please log in): suggest update or correction for this item

Repository Staff Only: item control page