Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21336301p&link_type=abstract
American Astronomical Society, AAS Meeting #213, #363.01; Bulletin of the American Astronomical Society, Vol. 41, p.513
Astronomy and Astrophysics
Astronomy
Scientific paper
One of the most powerful tests of stellar evolution theory for massive stars is to observationally establish the causal mapping between different populations of massive stars (e.g., red-supergiants, wolf-rayet stars) and their explosions (e.g., supernovae). This connection has been firmly proven only for a handful of objects, most notably in the case of supernova 1987A in the LMC with its blue-supergiant progenitor star Sk -69 202. However, the progenitors of most supernova types have not been identified directly. I will present two supernova-like transients discovered this year in the nearby galaxies NGC 6946 and NGC 300 for which we have identified the progenitors as dust-enshrouded massive stars in Spitzer images. This new class of luminous transients has progenitors that are extremely rare compared to known massive stellar populations in M33 identified in the mid-infrared. I will discuss the implications of these findings in the context of "low-mass" massive stars (i.e., close to 8 Msun) and connect it to electron-capture supernovae.
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