2002/12/17 by Mario Hamuy, Maximilian Stritzinger, M. M. Phillips +4 · 1 citation
Medicine · Physics and Astronomy · #Gamma-ray bursts and supernovae #Neutrino Physics Research #Viral gastroenteritis research and epidemiology #astro-ph
paper · pdf · doi:10.1007/10828549_29
6 pages, 4 figures, to appear in ``From Twilight to Highlight: The Physics of Supernovae'', Eds. W. Hillebrandt and B. Leibundgut, Springer Series ``ESO Astrophysics Symposia'', Berlin
arxiv created 2002/12/17 · openalex publication_date 2006/02/10 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/29
We present optical and infrared spectra of SN 1999ex that reveal a clear example of an intermediate Type Ib/c case. This suggests a continuous spectroscopic sequence between Type Ib and Type Ic supernovae. We report UBVRIz photometric observations of SN 1999ex that started only one day after explosion, which permitted us to witness an elusive transient cooling phase that lasted 4 days. The initial cooling and subsequent radioactive heating produced a dip in the lightcurve which is consistent with explosion models involving core collapse of evolved massive helium stars, and inconsistent with lightcurves resulting from the thermonuclear runaway of compact white dwarfs.