Type II Supernovae - an overview | ScienceDirect Topics
A type II supernova is a huge source of neutrinos of all flavors. This supernova is identified with the collapse of the iron core of a massive ( > 8 M ⊙ ) evolved star. Present type II supernova detectors are able to mainly observe neutrinos coming from the so-called cooling phase.
Type Ia Supernovae - an overview | ScienceDirect Topics
Type II and type Ia supernovae provide the dominant sites in which this “explosive nucleosynthesis” mechanism is known to operate. These two supernova sites operate on distinctively different timescales and eject different amounts of iron.
Type Ic Supernovae - an overview | ScienceDirect Topics
2008年1月9日 · Astronomy with Radioactivities. V. John F. Beacom, in New Astronomy Reviews, 2006 1 Introduction. The initial state that leads to a type-II (or type-Ib or type-Ic) supernova is essentially an iron white dwarf (the endpoint of nuclear fusion reactions) in the center of a massive star; when it reaches the Chandrasekhar mass, this core will collapse, along with the rest of …
A graph-based spectral classification of Type II supernovae
2023年7月1日 · SN2009dd is a Type II supernova that displays characteristics of both the bright branch and weak interaction between the circumstellar material and the ejecta, as indicated by high-velocity features in the Balmer lines (Inserra et al., 2013). This feature is commonly observed in Type IIn SNe and Type IIL SNe (Bostroem et al., 2019). Our graph ...
Convection, type II supernovae, and the early evolution of neutron ...
1988年6月1日 · The shock dies into an accretion shock within milliseconds and the purely hydrodynamical explosion is aborted [3, 7, 9-12]. Implosion should, in many cases, lead to explosion - the Type II supernova [13]. The failure of the direct mechanism has focused attention on long-term shock revitalization schemes [2, 14-16] to power the supernova.
Nucleosynthesis in type I and type II supernovae - ScienceDirect
1984年1月1日 · Major observatiori constraints for type ii supernova (SNii) are the existence of neutron stars in the center of SNil remnants and the observation of hydrogen iines in SN1I spectra. The first tact Is interpreted by the core bounce mechanism after the onset of a gravitationai coiiapse foiiowing core silicon burning of massive stars, leaving a ...
Nucleosynthesis in type II supernovae - ScienceDirect
1997年4月14日 · This is due to the larger C/O ratio in case 2513 after helium burning. Since the products of the 25 Alo star dominate type II supernova yields, this result suggests that the 12C(a,-y)160 rate is higher than that of CF88 and closer to CFHZ85. The presently most reliable experimental investigations give values inbetween the two rates.
The evolution and explosion of massive binary stars and Type Ib-Ic …
1995年5月1日 · Supernovae are classified as Type I and Type II and further subdivided into Ia, Ib, Ic, II-P, II-L, and IIb. The origin of such an observational diversity has not been well understood. The recent nearby supernovae SN 1993J and SN 1994I have provided particularly useful material to clarify the supernova-progenitor connection.
Nuclear structure and the fate of core collapse (Type II) supernova ...
2014年8月1日 · Download: Download high-res image (263KB) Download: Download full-size image Fig. 1. The onion layered structure of a 25 solar masses progenitor star before a core collapse (Type II) supernova and the time, temperature and density range of the various burning stages as illustrated by Bethe and Brown [2] with the temperature scale corrected by a factor …
On the cosmic ray spectrum from type II supernovae expanding in …
2015年9月1日 · For a type II supernova, instead, it is often the case that the explosion takes place in the wind produced by a red giant pre-supernova progenitor star. The density of the wind can be written as (8) ρ ( R ) ≅ M ̇ 4 π R 0 2 V w R 0 R 2 = ρ ( R 0 ) R 0 R 2 , where M ̇ is the rate of mass loss of the red giant and V w is the wind velocity.