56Ni dredge-up in the type IIp Supernova 1995V

Details 56Ni dredge-up in the type IIp Supernova 1995V 56Ni dredge-up in the type IIp Supernova 1995V

1998-04-29

arxiv.org/abs/astro-ph/9804315v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in MNRAS, 32 pages including 11 figures (uses psfig.sty - included)

Scientific paper

10.1046/j.1365-8711.1998.01747.x

We present contemporary infrared and optical spectra of the plateau type II SN 1995V in NGC 1087 covering four epochs, approximately 22 to 84 days after shock breakout. The data show, for the first time, the infrared spectroscopic evolution during the plateau phase of a typical type II event. In the optical region P Cygni lines of the Balmer series and of metals lines were identified. The infrared (IR) spectra were largely dominated by the continuum, but P Cygni Paschen lines and Brackett gamma lines were also clearly seen. The other prominent IR features are confined to wavelengths blueward of 11000 \AA and include Sr II 10327, Fe II 10547, C I 10695 and He I 10830 \AA. We demonstrate the presence of He I 10830 \AA on days 69 and 85. The presence of this line at such late times implies re-ionisation. A likely re-ionising mechanism is gamma-ray deposition following the radioactive decay of 56Ni. We examine this mechanism by constructing a spectral model for the He I 10830 \AA line based on explosion model s15s7b2f of Weaver & Woosley (1993). We find that this does not generate the observed line owing to the confinement of the 56Ni to the central zones of the ejecta. In order to reproduce the He I line, it was necessary to introduce additional upward mixing of the 56Ni, with 10^{-5} of the total nickel mass reaching above the helium photosphere. In addition, we argue that the He I line-formation region is likely to have been in the form of pure helium clumps in the hydrogen envelope.

Affiliated with

Also associated with

No associations

Rating

56Ni dredge-up in the type IIp Supernova 1995V 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 56Ni dredge-up in the type IIp Supernova 1995V, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and 56Ni dredge-up in the type IIp Supernova 1995V will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-448567