Detailed Analysis of Early to Late-Time Spectra of Supernova 1993J

Details Detailed Analysis of Early to Late-Time Spectra of Supernova 1993J Detailed Analysis of Early to Late-Time Spectra of Supernova 1993J

2000-06-19

arxiv.org/abs/astro-ph/0006264v1

Astronomy and Astrophysics

Astrophysics

34 pages, 16 figures, AASTeX V5.0. Accepted for publication in AJ

Scientific paper

10.1086/301519

We present a detailed study of line structure in early to late-time spectra of Supernova (SN) 1993J. Spectra during the nebular phase, but within the first two years after explosion, exhibit small-scale structure in the emission lines of some species, notably oxygen and magnesium, showing that the ejecta of SN 1993J are clumpy. On the other hand, a lack of structure in emission lines of calcium implies that the source of calcium emission is uniformly distributed throughout the ejecta. These results are interpreted as evidence that oxygen emission originates in clumpy, newly synthesized material, while calcium emission arises from material pre-existing in the atmosphere of the progenitor. Spectra spanning the range 433-2454 days after the explosion show box-like profiles for the emission lines, clearly indicating circumstellar interaction in a roughly spherical shell. This is interpreted within the Chevalier & Fransson (1994) model for SNe interacting with mass lost during prior stellar winds. At very late times, the emission lines have a two-horned profile, implying the formation of a somewhat flattened or disk-like structure that is a significant source of emission. The very high signal-to-noise ratio spectra are used to demonstrate the potential significance of misinterpretation of telluric absorption lines in the spectra of bright SNe.

Affiliated with

Also associated with

No associations

Rating

Detailed Analysis of Early to Late-Time Spectra of Supernova 1993J 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 Detailed Analysis of Early to Late-Time Spectra of Supernova 1993J, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Detailed Analysis of Early to Late-Time Spectra of Supernova 1993J will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-160264