SIMBAD references

2010ApJ...716..781K - Astrophys. J., 716, 781-791 (2010/June-2)

Fast radiation mediated shocks and supernova shock breakouts.


Abstract (from CDS):

We present a simple analytic model for the structure of non-relativistic and relativistic radiation mediated shocks. At shock velocities βs ≡ vs/c ≳ 0.1, the shock transition region is far from thermal equilibrium since the transition crossing time is too short for the production of a blackbody photon density (by bremsstrahlung emission). In this region, electrons and photons (and positrons) are in Compton (pair) equilibrium at temperatures Ts significantly exceeding the far downstream temperature, Ts{Gt} Td≈ 2(εnu{planck}3 c 3)1/4. Ts≳ 10keV is reached at shock velocities βs≈ 0.2. At higher velocities, βs≳ 0.6, the plasma is dominated in the transition region by e ± pairs and 60keV ≲ Ts≲ 200keV. We argue that the spectrum emitted during the breaking out of supernova (SN) shocks from the stellar envelopes (or the surrounding winds) of blue supergiants and Wolf-Rayet stars, which reach βs>0.1 for reasonable stellar parameters, may include a hard component with photon energies reaching tens or even hundreds of keV. Our breakout analysis is restricted to temperatures Ts≲ 50keV corresponding to photon energies hν ≲ 150keV, where pair creation can be neglected. This may account for the X-ray outburst associated with SN2008D, and possibly for other SN-associated outbursts with spectra not extending beyond few 100keV (e.g., XRF060218/SN2006aj).

Abstract Copyright:

Journal keyword(s): radiation mechanisms: non-thermal - shock waves - supernovae: general - supernovae: individual: SN 2008D - X-rays: bursts

CDS comments: GRB080425 is a misprint for GRB980425.

Simbad objects: 4

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