Shock steepening and prompt thermal emission in supernovae
Shock steepening and prompt thermal emission in supernovae
复制标题
超新星中的激波陡峭和瞬发热发射
DOI：
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发表时间：
1978
期刊：
影响因子：
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通讯作者：
S. W. Falk
中科院分区：
文献类型：
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作者：
S. W. Falk
A calculation of supernova shock propagation down the exponential density gradient at the outside of the presupernova giant envelope predicts a strong quasi-thermal burst of ultraviolet and soft X-ray luminosity accompanying the emergence of the radiative shock at the stellar photosphere. Burst duration is of order several thousand seconds, with characteristic luminosities of 10/sup 45/ ergs s/sup -1/ in the thermal continuum, peaked at about 500 A. Total UV energy radiated is of order several times 10/sup 48/ ergs. Expansion velocities in the outer 5 x 10/sup -3/ M/sub sun/ of material reach nearly 10/sup 4/ km s/sup -1/, in excellent agreement with peak values inferred from Doppler-shifted lines in the spectra of these objects. No underlying source of energy (pulsar, etc.) is required; the simple shock wave model for supernova light curves can account for all of the major features of observed Type II events. A hard X-ray burst (kTapprox.10--100 keV) results from the transition to an ion-viscous shock in the outermost surface layers.
