Hydrodynamical simulations of detonations in superbursts

A new hydrodynamical algorithm to study astrophysical detonations is presented. A prime motivation of this development is the description of a carbon detonation in conditions relevant to superbursts, which are thought to result from the propagation of a detonation front around the surface of a neutron star in the carbon layer underlying the atmosphere. The one-dimensional calculations we have performed demonstrate that the carbon detonation at the surface of a neutron star is a multiscale phenomenon. We show that a multi-resolution approach can be used to solve all the reaction lengths. For mixed H/He accreting systems, we have introduced a new reduced network to study the impact of the photodesintegration of the heavy elements on the detonation.

[1]  Ucsb,et al.  Hydrodynamic Thermonuclear Runaways in Superbursts , 2006, astro-ph/0609267.

[2]  Tod E. Strohmayer,et al.  A Remarkable 3 Hour Thermonuclear Burst from 4U 1820–30 , 2001, astro-ph/0108420.

[3]  The observers' view of (very) long X-ray bursts: they are super! , 2003, astro-ph/0310402.

[4]  Elaine S. Oran,et al.  Multilevel Structure of Cellular Detonations in Type Ia Supernovae , 1999 .

[5]  L. Bildsten,et al.  The Endpoint of the rp process on accreting neutron stars , 2001 .

[6]  B. V. Leer,et al.  Towards the ultimate conservative difference scheme V. A second-order sequel to Godunov's method , 1979 .

[7]  L. Bildsten,et al.  Photodisintegration-triggered Nuclear Energy Release in Superbursts , 2003 .

[8]  M. Arnould,et al.  Microscopic nuclear models for astrophysics: The Brussels BRUSLIB nuclear library and beyond , 2006 .

[9]  A. Cumming.  Superbursts: A New Probe of the rp-Process , 2005 .

[10]  Miltiadis Papalexandris,et al.  Computational study of three-dimensional gaseous detonation structures , 2006 .

[11]  Andrew Cumming,et al.  Carbon Flashes in the Heavy-Element Ocean on Accreting Neutron Stars , 2001, astro-ph/0107213.

[12]  Hydrodynamical simulation of detonations in superbursts I. the hydrodynamical algorithm and some preliminary one-dimensional results , 2007 .

[13]  A. Jorissen,et al.  BRUSLIB and NETGEN: the Brussels nuclear reaction rate library and nuclear network generator for astrophysics , 2005, astro-ph/0506584.