Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-07-08
Publ.Astron.Soc.Pac.115:1220-1235,2003
Astronomy and Astrophysics
Astrophysics
45 pages, accepted for publication in the October 2003 issue of PASP. Some references added
Scientific paper
10.1086/378242
We present optical photometric and spectral data of the peculiar Type Ic SN 2002ap. Photometric coverage includes UBVRI bands from 2002 January 30, the day after discovery, through 2002 December 12. There are 5 early-time spectra and 8 in the nebular phase. We determine that SN 2002ap is similar to SN 1997ef and the GRB-associated SN 1998bw with respect to spectral and photometric characteristics. The nebular spectra of SN 2002ap present the largest Mg I] \lambda 4571 to [O I] \lambda \lambda 6300, 6364 ratio of any supernova spectra yet published, suggesting that the progenitor of SN 2002ap was a highly stripped star. Comparing the nebular spectra of SN 1985F and SN 2002ap, we notice several similar features, casting the classification of SN 1985F as a normal Type Ib supernova in doubt. We also present nebular modeling of SN 2002ap and find that the object ejected >~ 1.5 M_{sun} of material within the outer velocity shell of the nebula (~5500 km/s) and synthesized ~0.09 M_{sun} of 56Ni.
Chornock Ryan
Filippenko Alexei V.
Foley Ryan J.
Leonard Douglas C.
Li Weidong
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