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 Citation (Scopus)

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 publicationEPJ Web of Conferences
Volume64
DOIs
StatePublished - 2014
EventPhysics at the Magnetospheric Boundary Conference - Geneva, Switzerland
Duration: Jun 25 2013Jun 28 2013

Other

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

Fingerprint

chromosphere
radiative transfer
shock
mechanical shock
shock heating
atmospheres
stellar atmospheres
oscillations
funnels
radiation effects
photosphere
opacity
periodic variations
hydrodynamics
radiation
gases
x rays
simulation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

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 EPJ Web of Conferences (Vol. 64). [04002] https://doi.org/10.1051/epjconf/20136404002

Accretion shock stability on a dynamically heated YSO atmosphere with radiative transfer. / De Sá, Lionel; Chièze, Jean Pierre; Stehlé, Chantal; Matsakos, Titos; Ibgui, Laurent; Lanz, Thierry; Hubeny, Ivan -.

EPJ Web of Conferences. Vol. 64 2014. 04002.

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

De Sá, L, Chièze, JP, Stehlé, C, Matsakos, T, Ibgui, L, Lanz, T & Hubeny, I 2014, Accretion shock stability on a dynamically heated YSO atmosphere with radiative transfer. in EPJ Web of Conferences. vol. 64, 04002, Physics at the Magnetospheric Boundary Conference, Geneva, Switzerland, 6/25/13. https://doi.org/10.1051/epjconf/20136404002
De Sá L, Chièze JP, Stehlé C, Matsakos T, Ibgui L, Lanz T et al. Accretion shock stability on a dynamically heated YSO atmosphere with radiative transfer. In EPJ Web of Conferences. Vol. 64. 2014. 04002 https://doi.org/10.1051/epjconf/20136404002
De Sá, Lionel ; Chièze, Jean Pierre ; Stehlé, Chantal ; Matsakos, Titos ; Ibgui, Laurent ; Lanz, Thierry ; Hubeny, Ivan -. / Accretion shock stability on a dynamically heated YSO atmosphere with radiative transfer. EPJ Web of Conferences. Vol. 64 2014.
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