首页|Point-symmetry in SNR G1.9+0.3:A Supernova that Destroyed its Planetary Nebula Progenitor
Point-symmetry in SNR G1.9+0.3:A Supernova that Destroyed its Planetary Nebula Progenitor
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维普
I analyze a new X-ray image of the youngest supernova remnant(SNR)in the Galaxy,which is the type Ⅰa SNR G1.9+0.3,and reveal a very clear point-symmetrical structure.Since explosion models of type Ⅰa supernovae(SNe Ia)do not form such morphologies,the point-symmetrical morphology must come from the circumstellar material(CSM)into which the ejecta expands.The large-scale point-symmetry that I identify and the known substantial deceleration of the ejecta of SNR Gl.9+0.3 suggest a relatively massive CSM of(≥)1 M⊙.I argue that the most likely explanation is the explosion of this SN Ⅰa into a planetary nebula.The scenario that predicts a large fraction of SN Ⅰa inside PNe(SNIPs)is the core degenerate scenario.Other SN Ⅰa scenarios might lead to only a very small fraction of SNIPs or none at all.
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