What are Type Ia and Type II supernovae?
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.
Which type of galaxy can we find supernovae of type Ia?
Since a white dwarf is involved, Type Ia supernovas are expected to be found among old star systems, such as globular clusters, the central bulges of galaxies and elliptical galaxies.
What are Type Ia supernovae used for?
Type Ia supernovae are useful probes of the structure of the universe, since they all have the same luminosity. By measuring the apparent brightness of these objects, one also measures the expansion rate of the universe and that rate’s variation with time.
How and why a Type Ia supernova occurs?
When the collapse is abruptly stopped by the neutrons, matter bounces off the hard iron core, thus turning the implosion into an explosion. For a Type Ia supernova, the energy comes from the runaway fusion of carbon and oxygen in the core of a white dwarf.
What is the difference between Type Ia and Type II supernovae quizlet?
What is the difference between Type Ia and Type II supernovae? Physically, type II supernovae are caused by the collapse of a massive star. Type Ia supernovae are driven by a white dwarf which accretes enough mass to exceed the Chandrasekhar limit and collapses into a neutron star.
What are the physical differences between Type Ia and Type II supernovae in terms of the kinds of stars that explode and their explosion mechanisms?
(Review #14, page 325) What is the difference between type Ia and type II supernovae? 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.
How do we know that all Type Ia supernovae have the same luminosity?
Since the initial conditions are about the same in all cases, these supernovae tend to have the same luminosity, and their “light curves” (how the luminosity changes over time) are predictable. The simulations showed that the asymmetry of the explosions is a key factor determining the brightness of type 1a supernovae.
Which type of supernova is intrinsically brighter at its peaks Type IA or Type II?
Type Ia supernovae, which require a white dwarf star in a binary star system, are brighter than type II supernovae, but some of them could also happen in older parts of the Galaxy that are hidden by the buildup of gas and dust in the disk.
Why are Type Ia supernovae better standard candles than Type II supernovae?
Though Type II supernovae can vary significantly in brightness, all type Ia supernovae have approximately the same absolute magnitude after their light curves have been corrected for the timescale “ stretch-factor” . Type Ia supernovae occur when a white dwarf accumulates too much mass to resist the force of gravity.
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.
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.
How do the two types of supernovae differ Type Ia and Type II?
Type Ia supernovae are produced by white dwarf stars in a binary star system that have exceeded their Chandrasekhar limit when the companion star dumps a lot of material onto them. Type II supernovae are produced by massive stars whose cores collapse following the exhaustion of their fusion processes.
