Journal Article

Supernova 1994aj: a probe for pre-supernova evolution and mass-loss from the progenitor

S. Benetti, E. Cappellaro, I. J. Danziger, M. Turatto, F. Patat and M. Della Valle

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 294, issue 3, pages 448-456
Published in print March 1998 | ISSN: 0035-8711
Published online March 1998 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-8711.1998.01198.x
Supernova 1994aj: a probe for pre-supernova evolution and mass-loss from the progenitor

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Abstract

Extensive photometric and spectroscopic observations of SN 1994aj until 540 d after maximum light have been obtained. The photometry around maximum suggests that the SN belongs to the Type II Linear class, with a peak absolute magnitude of MV∼-17.8 (assuming H0=75 km s-1 Mpc-1). The spectra of SN 1994aj were unusual, with the presence of a narrow line with a P Cygni profile on top of the broad Balmer line emission. This narrow feature is attributed to the presence of a dense superwind surrounding the SN. At 100–120 d after maximum light the SN ejecta start to interact with this circumstellar material. The SN luminosity decline rates slowed down [γR=0.46 mag (100 d)-1], becoming less steep than the average late luminosity decline of normal SN II [∼1 mag (100 d)-1]. This dense (M/uW∼1015 g cm-1) wind was confined to a short distance from the progenitor (Rout=∼5×1016 cm), and results from a very strong mass-loss episode ( M=10-3 M⊙ yr-1), which terminated shortly before explosion (∼5–10 yr).

Keywords: supernovae: general; supernovae: individual: SN 1994aj; supernova remnants

Journal Article.  0 words. 

Subjects: Astronomy and Astrophysics

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