2001/12/04 by I. Salamanca, R. Terlevich, R. J. Terlevich +2 · 5 citations
Physics and Astronomy · #Astrophysical Phenomena and Observations #Gamma-ray bursts and supernovae #Pulsars and Gravitational Waves Research #astro-ph
paper · pdf · doi:10.1046/j.1365-8711.2002.05167.x
published as Mon.Not.Roy.Astron.Soc. 330 (2002) 844 · Accepted for publication in MNRAS
arxiv created 2001/12/04 · openalex publication_date 2002/03/01 · arxiv updated 2009/12/01 · openalex created_date 2020/11/23 · openalex updated_date 2026/07/28
We report the detection of a very narrow P Cygni profile on top of the broad emission Hα and Hβ lines of the Type IIn Supernova 1997eg. A similar feature has been detected in SN 1997ab, SN 1998S and SN 1995G. The detection of the narrow P Cygni profile indicates the existence of a dense circumstellar material (CSM), into which the ejecta of the supernova is expanding. From the analysis of the spectra of SN 1997eg we deduce (i) that such CSM is very dense (n ≳ 5 × 107 cm−3), (ii) that it has a low expanding velocity of about 160 km s−1. The origin of such dense CSM can be either a very dense progenitor wind (Ṁ ∼ 10−2 M⊙ yr−1) or a circumstellar shell product of the progenitor wind expanding into a highpressure environment.