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Hubble Space Telescope and Ground-Based Observations of SN 1993J and SN 1998S: CNO Processing in the Progenitors | | Claes Fransson
; Peter M. Challis
; Roger A. Chevalier
; Alexei V. Filippenko
; Robert P. Kirshner
; Cecilia Kozma
; Douglas C. Leonard
; Thomas Matheson
; E. Baron
; Peter Garnavich
; Saurabh Jha
; Bruno Leibundgut
; Peter Lundqvist
; C. S. J. Pun
; Lifan Wang
; J. Craig Wheeler
; | | Date: |
17 Sep 2004 | | Journal: | Astrophys.J. 622 (2005) 991-1007 | | Subject: | astro-ph | | Abstract: | Ground-based and Hubble Space Telescope observations are presented for SN 1993J and SN 1998S. SN 1998S shows strong, relatively narrow circumstellar emission lines of N III-V and C III-IV, as well as broad lines from the ejecta. Both the broad ultraviolet and optical lines in SN 1998S indicate an expansion velocity of ~7,000 km/s. The broad emission components of Ly-alpha and Mg II are strongly asymmetrical after day 72 past the explosion, and differ in shape from H-alpha. Different models based on dust extinction from dust in the ejecta or shock region, in combination with H-alpha from a circumstellar torus, are discussed. It is concluded, however, that the double-peaked line profiles are more likely to arise as a result of optical depth effects in the narrow, cool, dense shell behind the reverse shock, than in a torus-like region. The ultraviolet lines of SN 1993J are broad, with a box-like shape, coming from the ejecta and a cool dense shell. The shapes of the lines are well fitted with a shell with inner velocity ~7,000 km/s and outer velocity ~10,000 km/s. For both SN 1993J and SN 1998S a strong nitrogen enrichment is found, with N/C~12.4 in SN 1993J and N/C~6.0 in SN 1998S. From a compilation of all supernovae with determined CNO ratios, we discuss the implications of these observations for the structure of the progenitors of Type II supernovae. | | Source: | arXiv, astro-ph/0409439 | | Services: | Forum | Review | PDF | Favorites | |
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