Evidence of Asymmetry in SN 2007rt, a Type IIn Supernova - Astrophysics > Solar and Stellar AstrophysicsReportar como inadecuado

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Abstract: An optical photometric and spectroscopic analysis of the slowly-evolving TypeIIn SN2007rt is presented, covering a duration of 481 days after discovery.
Itsearliest spectrum, taken approximately 100 days after the explosion epoch,indicates the presence of a dense circumstellar medium, with which thesupernova ejecta is interacting.
This is supported by the slowly-evolving lightcurve.
A notable feature in the spectrum of SN 2007rt is the presence of abroad He I 5875 line, not usually detected in Type IIn supernovae.
This mayimply that the progenitor star has a high He-H ratio, having shed a significantportion of its hydrogen shell via mass-loss.
An intermediate resolutionspectrum reveals a narrow Halpha P-Cygni profile, the absorption component ofwhich has a width of 128 km-s.
This slow velocity suggests that the progenitorof SN 2007rt recently underwent mass-loss with wind speeds comparable to thelower limits of those detected in luminous blue variables.
Asymmetries in theline profiles of H and He at early phases bears some resemblance todouble-peaked features observed in a number of Ib-c spectra.
These asymmetriesmay be indicative of an asymmetric or bipolar outflow or alternatively dustformation in the fast expanding ejecta.
In addition, the late time spectrum, atover 240 days post-explosion, shows clear evidence for the presence of newlyformed dust.

Autor: C.
Trundle 1, A.
Pastorello 1, S.
Benetti 2, R.
Kotak 1, S.
Valenti 1, I.
Agnoletto 2, F.
Bufano 2, M.
Dolci 3, N.
Elias-Rosa 4,

Fuente: https://arxiv.org/


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