Finding Type II Supernova Progenitors through Stellar Ejecta Nebulae

Details Finding Type II Supernova Progenitors through Stellar Ejecta Nebulae Finding Type II Supernova Progenitors through Stellar Ejecta Nebulae

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..391c&link_type=abstract

NOAO Proposal ID #1999A-0391

Physics

Scientific paper

Massive stars end their lives in supernova explosions; however, it is not clear at which evolutionary stage a massive star explodes. Evolved massive stars lose mass to form stellar ejecta nebulae. It has been observed that ejecta nebulae associated with stars of different spectral types have distinct nebular sizes, densities, and expansion velocities. It is thus possible to use the physical properties of stellar ejecta nebulae detected around young supernovae to diagnose the evolutionary path of the progenitors. Using a high-dispersion echelle observation of SN1978K, we recently determined that its progenitor was a luminous blue variable. We propose to survey 20 young (≤20 yrs), nearby (within ~25 Mpc), Type II supernovae for stellar ejecta nebulae. The physical properties of the stellar ejecta nebulae not only may be used to diagnose the spectral types of the supernova progenitor but also help us to predict when the supernova ejecta will collide with the stellar ejecta nebulae.

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