How bright is a Type 2 supernova?
The peak brightness of SNII-L are nearly uniform at ~2.5 magnitudes fainter than a Type Ia supernova, however, the peak brightness of SNII-P show a large dispersion, which is almost certainly due to differences in the radii of the progenitors.
How much light does a type II supernova emit at maximum luminosity?
Type II supernovae have less sharp peaks at maxima and peak at about 1 billion solar luminosities.
What is the luminosity of a supernova?
The authors find that the maximum luminosity that can be produced by these different supernova models ranges between 5*1043 and 2*1046 erg/s, with total radiated energies of 3*1050 to 4*1052 erg. This places the upper limit on the brightness of a supernova at about 5 trillion times the luminosity of the Sun.
What are the differences between type I and Type II supernova?
A type I supernova occurs in closed binary systems where two average stars orbit around each other quite closely. A type II supernova occurs in larger stars of around 10 solar masses. After it leaves the main sequence it starts fusing increasingly heavy elements in shells around the core.
What are Type Ia and Type II supernovae?
A star can go supernova in one of two ways: Type I supernova: star accumulates matter from a nearby neighbor until a runaway nuclear reaction ignites. Type II supernova: star runs out of nuclear fuel and collapses under its own gravity.
What is the difference between Type 1a and Type 2 supernovae?
What are the remnants of type I and type II supernovae?
What’s left over:
- Type Ia: a gaseous supernova remnant, very rich in iron.
- Type II: a gaseous supernova remnant, containing elements heavier than iron. In addition, a Type II supernova leaves behind a compressed stellar core, which is now a neutron star or black hole.
Why are Type 1a supernovae all the same luminosity?
Type Ia supernovae happen when a white dwarf, the “corpse” of a star similar to the Sun, absorbs material from a twin star until it reaches a critical mass—1.4 times that of the Sun—and explodes. Because of their origin, all these explosions share a very similar luminosity.
What is the difference between a Type 1 and Type 2 supernova?
What is the difference between type I and type II supernova?
How do spectra show the difference between a Type I supernova and a Type II supernova Why does this difference arise?
Observationallly, type Ia supernovae do not have hydrogen line in their spectra and type II supernovae do display these lines. Physically, type II supernovae are caused by the collapse of a massive star.
What kind of light does a type II supernova have?
Type II-Linear ( SNII -L) supernovae have a fairly rapid, linear decay after maximum light, while Type II-Plateau ( SNII -P) supernovae remain bright (on a plateau) for an extended period of time after maximum.
How is the light curve of a supernova determined?
The supernova becomes visible at optical wavelengths as it expands, with the initial rise in the light curve the result of the increasing surface area of the star combined with a relatively slow temperature decrease. Some astronomers divide Type II supernovae into SNII -L and SNII -P based on the shape of their light curves.
How many times does the Sun have to have mass to be a supernova?
A star must have at least 8 times, but no more than 40 to 50 times, the mass of the Sun ( M☉) to undergo this type of explosion. Type II supernovae are distinguished from other types of supernovae by the presence of hydrogen in their spectra.
How is the collapse of a type II supernova halted?
For Type II supernovae, the collapse is eventually halted by short-range repulsive neutron-neutron interactions, mediated by the strong force, as well as by degeneracy pressure of neutrons, at a density comparable to that of an atomic nucleus.
