SN 2003bg: The First Type IIb Hypernova

Details SN 2003bg: The First Type IIb Hypernova SN 2003bg: The First Type IIb Hypernova

2009-08-12

arxiv.org/abs/0908.1783v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

41 pages, 12 figures, accepted by The Astrophysical Journal

Scientific paper

Optical and near-infrared photometry and optical spectroscopy are reported for SN 2003bg, starting a few days after explosion and extending for a period of more than 300 days. Our early-time spectra reveal the presence of broad, high-velocity Balmer lines. The nebular-phase spectra, on the other hand, show a remarkable resemblance to those of Type Ib/c supernovae, without clear evidence for hydrogen. Near maximum brightness SN 2003bg displayed a bolometric luminosity comparable to that of other Type I hypernovae unrelated to gamma-ray bursts, implying a rather normal amount of 56Ni production (0.1-0.2 Msun) compared with other such objects. The bolometric light curve of SN 2003bg, on the other hand, is remarkably broad, thus suggesting a relatively large progenitor mass at the moment of explosion. These observations, together with the large value of the kinetic energy of expansion established in the accompanying paper (Mazzali et al. 2009), suggest that SN 2003bg can be regarded as a Type IIb hypernova.

Affiliated with

Also associated with

No associations

Rating

SN 2003bg: The First Type IIb Hypernova does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with SN 2003bg: The First Type IIb Hypernova, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and SN 2003bg: The First Type IIb Hypernova will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-371261