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Protoplanetary disk fragmentation with varying radiative physics, initial conditions and numerical techniques


Mayer, Lucio; Gawryszczak, Artur J (2008). Protoplanetary disk fragmentation with varying radiative physics, initial conditions and numerical techniques. In: Fischer, D; Rasio, F A; Thorsett, S E; Wolszczan, A. Extreme solar systems : proceedings of a conference held on Santorini Island, Greece, 25-29 June 2007. San Francisco, Calif., US: Astronomical Society of the Pacific, 243-256.

Abstract

We review recent results of SPH simulations of gravitational instability in gaseous protoplanetary disks, emphasizing the role of thermodynamics in both isolated and binary systems. Contradictory results appeared in the literature regarding disk fragmentation at tens of AU from the central star are likely due to the different treatment of radiation physics as well as reflecting different initial
conditions. Further progress on the subject requires extensive comparisons between different codes with the requirement that the same initial conditions are adopted. It is discussed how the local conditions of the disks undergoing fragmentation at R < 25 AU in recent SPH simulations are in rough agreement with the prediction of analytical models, with small differences being likely related to the inability of analytical models to account for the dynamics and thermodynamics of three-dimensional spiral shocks. We report that radically different
adaptive hydrodynamical codes, SPH and adaptive mesh refinement (AMR), yield very similar results on disk fragmentation at comparable resolution in the simple case of an isothermal equation of state. A high number of refinements in AMR codes is necessary but not sufficient to correctly follow fragmentation, rather an initial resolution of the grid high enough to capture the wavelength
of the strongest spiral modes when they are still barely nonlinear is essential. These tests represent a useful benchmark and a starting point for a forthcoming code comparison with realistic radiation physics.

We review recent results of SPH simulations of gravitational instability in gaseous protoplanetary disks, emphasizing the role of thermodynamics in both isolated and binary systems. Contradictory results appeared in the literature regarding disk fragmentation at tens of AU from the central star are likely due to the different treatment of radiation physics as well as reflecting different initial
conditions. Further progress on the subject requires extensive comparisons between different codes with the requirement that the same initial conditions are adopted. It is discussed how the local conditions of the disks undergoing fragmentation at R < 25 AU in recent SPH simulations are in rough agreement with the prediction of analytical models, with small differences being likely related to the inability of analytical models to account for the dynamics and thermodynamics of three-dimensional spiral shocks. We report that radically different
adaptive hydrodynamical codes, SPH and adaptive mesh refinement (AMR), yield very similar results on disk fragmentation at comparable resolution in the simple case of an isothermal equation of state. A high number of refinements in AMR codes is necessary but not sufficient to correctly follow fragmentation, rather an initial resolution of the grid high enough to capture the wavelength
of the strongest spiral modes when they are still barely nonlinear is essential. These tests represent a useful benchmark and a starting point for a forthcoming code comparison with realistic radiation physics.

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Additional indexing

Item Type:Book Section, refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
Dewey Decimal Classification:530 Physics
Language:English
Date:2008
Deposited On:08 Mar 2009 11:43
Last Modified:17 Aug 2016 15:55
Publisher:Astronomical Society of the Pacific
Series Name:Astronomical Society of the Pacific conference series
Number:398
ISBN:978-1-58381-666-0
Official URL:http://www.aspbooks.org/a/volumes/table_of_contents/?book_id=104
Related URLs:http://www.recherche-portal.ch/ZAD:default_scope:ebi01_prod005762684 (Library Catalogue)
Permanent URL: http://doi.org/10.5167/uzh-17017

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