منابع مشابه
HYDROGEN IN TYPE Ic SUPERNOVAE?
By definition, a Type Ic supernova (SN Ic) does not have conspicuous lines of hydrogen or helium in its optical spectrum. SNe Ic usually are modelled in terms of the gravitational collapse of bare carbon–oxygen cores. We consider the possibility that the spectra of ordinary (SN 1994I–like) SNe Ic have been misinterpreted, and that SNe Ic eject hydrogen. An absorption feature usually attributed ...
متن کاملSearching for Hydrogen in Type Ib Supernovae, and for Helium and Hydrogen in Type Ic
Identifying the progenitors of Type Ib and Type Ic supernovae requires knowing, among other things, whether SNe Ib eject hydrogen, and whether SNe Ic eject helium, and perhaps even hydrogen. Recently it has become clear that some SNe Ib do eject hydrogen, and it may be that all SNe Ib do. Two arguments that have been made in the past that SNe Ic eject helium are difficult to confirm, but I disc...
متن کاملNew Perspectives on Type Ic Supernovae
The Type Ic supernovae are probably “nearly-nude” core collapse events. They are thus of special interest in terms of their evolutionary origin, but also as the source of potential clues to the explosion process that may not be obtained from other supernovae. Study of Type Ic shows that they are distinct from Type Ia, even those of the dimmer, redder variety. Type Ic also suggest that the histo...
متن کاملThe Broad Line Type Ic Supernova Sn 2007ru: Adding to the Diversity of Type Ic Supernovae
Photometric and spectral evolution of the type Ic supernova SN 2007ru during the first 3 months are presented. The spectra show broad spectral features due to very high expansion velocity, normally seen in hypernovae. The photospheric velocity is higher than other type Ic supernovae. It is lower than SN 1998bw at ∼ 8 days after the explosion, but is comparable at later epochs. The light curve e...
متن کاملCIRCUMSTELLAR EMISSION FROM TYPE Ib AND Ic SUPERNOVAE
The presumed Wolf-Rayet star progenitors of Type Ib/c supernovae have fast, low density winds and the shock waves generated by the supernova interaction with the wind are not expected to be radiative at typical times of observation. The injected energy spectrum of radio emitting electrons typically has an observed index p = 3, which is suggestive of acceleration in cosmic ray dominated shocks. ...
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ژورنال
عنوان ژورنال: Publications of the Astronomical Society of the Pacific
سال: 2006
ISSN: 0004-6280,1538-3873
DOI: 10.1086/505548