Accretion shock stability on a dynamically heated YSO atmosphere with radiative transfer

Lionel De Sá, Jean Pierre Chièze, Chantal Stehlé, Titos Matsakos, Laurent Ibgui, Thierry Lanz, Ivan Hubeny

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Theory and simulations predict Quasi-Periodic Oscillations of shocks which develop in magnetically driven accretion funnels connecting the stellar disc to the photosphere of Young Stellar Objects (YSO). X-ray observations however do not show evidence of the expected periodicity. We examine here, in a first attempt, the influence of radiative transfer on the evolution of material impinging on a dynamically heated stellar atmosphere, using the 1D ALE-RHD code ASTROLABE. The mechanical shock heating mechanism of the chromosphere only slightly perturbs the flow. We also show that, since the impacting flow, and especially the part which penetrates into the chromosphere, is not treated as a purely radiating transparent medium, a sufficiently efficient coupling between gas and radiation may affect or even suppress the oscillations of the shocked column. This study shows the importance of the description of the radiation effects in the hydrodynamics and of the accuracy of the opacities for an adequate modeling.

Original languageEnglish (US)
Title of host publicationPhysics at the Magnetospheric Boundary
DOIs
StatePublished - Feb 13 2014
EventPhysics at the Magnetospheric Boundary Conference - Geneva, Switzerland
Duration: Jun 25 2013Jun 28 2013

Publication series

NameEPJ Web of Conferences
Volume64
ISSN (Print)2101-6275
ISSN (Electronic)2100-014X

Other

OtherPhysics at the Magnetospheric Boundary Conference
CountrySwitzerland
CityGeneva
Period6/25/136/28/13

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    De Sá, L., Chièze, J. P., Stehlé, C., Matsakos, T., Ibgui, L., Lanz, T., & Hubeny, I. (2014). Accretion shock stability on a dynamically heated YSO atmosphere with radiative transfer. In Physics at the Magnetospheric Boundary [04002] (EPJ Web of Conferences; Vol. 64). https://doi.org/10.1051/epjconf/20136404002