Type II Supernovae - an overview | ScienceDirect Topics
5 Core collapse supernova neutrinos. 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.
What is the difference between a type I and type II supernovas?
2016年3月22日 · A type I supernova is caused by a white dwarf and a type II supernova is caused by a massive star. Both types of supernova are caused by a star's core collapsing under gravity. When this happens temperatures and pressures increase until the point where new fusion reactions start. These fusion reactions can consume huge amounts of material in a short time which causes the star to explode ...
Nucleosynthesis in type II supernovae - ScienceDirect
1997年4月14日 · First stars V - Abundance patterns from C to Zn and supernova yields in the early Galaxy 2004, Astronomy and Astrophysics Nucleosynthesis in chandrasekhar mass models for type Ia supernovae and constraints on progenitor systems and burning-front propagation
Supernovae - an overview | ScienceDirect Topics
2008年1月9日 · This energy corresponds to a mass M = W/c 2 ∼ 10 31 g ∼ 0·01M ⊙; if we bear in mind that the mass of type 2 supernovae may be tens of times the mass of the Sun (M ⊙ = 2 × 10 33 g) the energy generated corresponding to a mass 10 31 g is still possible (in thermonuclear reactions the energy generated is of the order of 10 −3 of the ...
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 …
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 ...
What causes a massive star to explode as a supernova?
2018年5月14日 · Really massive star may result in a supernova if there is a change in its core. The change may occur in two ways, classified as type 1 and type 2, both are explained below- Type I supernovae lack a hydrogen signature in their light spectra. It occurs in binary star systems. In this one of the stars, generally a carbon-oxygen white dwarf, steals matter from its partner star and thus over time ...
Type Ia Supernovae - an overview | ScienceDirect Topics
The iron-peak nuclei observed in nature had their origin in supernova explosions. 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.
Massive supernovae in binary systems - ScienceDirect
1999年4月1日 · The principal effects of evolution in a close binary system on the progenitor of a Type II supernova can be broadly divided into three categories (Podsiadlowski et al., 1992; hereafter PJH): (1) loss of a portion of the stellar envelope to the companion star, (2) accretion of matter from the companion star, or (3) merger of the two stars in a common-envelope phase.
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 ...