Speaker
Lucile Van Box Som
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P2.4016.pdf
Megajoule designs relevant to study radiative accretion shocks
in magnetic accreting white dwarfs
L. Van Box Som1,2,3 , É. Falize1,3 , J.-M. Bonnet-Bidaud3 , C. Busschaert1 , A. Ciardi2 ,
M. Koenig4 , M. Mouchet5
1 CEA, DAM, DIF, F-91297 Arpajon, France
2 LERMA, Sorbonne Université, Observatoire de Paris, Université PSL, Paris, France
3 CEA Saclay, DSM/Irfu/Service d’Astrophysique, F-91191 Gif-sur-Yvette, France
4 LULI - CNRS, École Polytechnique, CEA : Université Paris-Saclay ; UPMC Univ. Paris 06 :
Sorbonne Université, Palaiseau, France
5 LUTH, Observatoire de Paris, PSL Research University, CNRS, Université Paris Diderot,
Sorbonne Paris Cité, F-92195 Meudon, France
Magnetic accreting white dwarfs are perfect laboratory objects to study the high-energy pro-
cesses in extreme astrophysical regimes. These objects are part of complex binary systems and
they accrete matter from a low-mass companion star [1]. The radiation observed from these sys-
tems comes mainly from an unresolved area where the accretion flow impacts the white dwarf
surface creating an accretion column [2, 3]. Based on the similarity properties of this high-
energy environment [4], millimetre-sized models of accretion columns can be produced with
powerful lasers and can give us new opportunities to study the radiative accretion processes in
laboratory. For the first time, we will introduce a new target design to produce similar astro-
physical regime which are only achievable on megajoule facilities (LMJ, NIF) [5]. The data ob-
tained from such laboratory experiments will provide new insights and help clarify outstanding
questions related to radiative transfer in accretion column models. By gathering astronomical
observations, theoretical, numerical and experimental studies, we will improve our understand-
ing of the radiative effects on both the post-shock structure and the accretion shock dynamics
which are fundamental for the characterization of magnetic accreting white dwarfs systems.
References
[1] Warner, B. Cambridge Astrophysics Series, 28 (1995)
[2] Mouchet, M., Bonnet-Bidaud, J.-M., Van Box Som, L., et al. Astron. & Astrophys., 600, A53 (2017)
[3] Van Box Som, L., Falize, É., Bonnet-Bidaud, J.-M., et al. Mont. Not. R. astr. Soc. 444, 420-428 (2018)
[4] Falize, É., Michaut, C., & Bouquet, S., Astrophys. J., 730, 96 (2011)
[5] Casner, A., Caillaud, T., Darbon, S., et al. 2015, High Energy Density Physics, 17, 2
