What are the 2 types of supernovae?
There are two basic types of supernova, called (boringly enough) “Type I” and “Type II”.
- Type I: supernovae WITHOUT hydrogen absorption lines in their spectrum.
- Type II: supernovae WITH hydrogen absorption lines in their spectrum.
What does a Type 1 supernova leave behind?
Type I (especially Ia) supernova create most of the iron and nickel found in the interstellar medium. Type Ia supernovae are several times more luminous than Type Ib, Ic, and Type II supernovae, leave no core remnant behind, and result from when a low-mass star’s core remnant (a white dwarf) detonates.
What triggers a Type 2 supernova?
A Type II supernova (plural: supernovae or supernovas) results from the rapid collapse and violent explosion of a massive star. 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.
Does a supernova turn into a black hole?
When the cores collapse to form dense stellar objects called neutron stars, they blast off the outer layers of the star in a supernova. When the core collapses, the blast wave slams into the dense material above, which thwarts the explosion. Instead of creating a supernova, the star implodes, forming a black hole.
How fast does a supernova collapse?
70,000 meters per second
What two possible outcomes can result from a Type II supernova?
Results of Type II Supernovae The results of a Type II Supernova are either neutron stars or black holes (explained below), along with a supernova remnant. The energy and mass that make up a supernova remnant spread out and become a part of the interstellar medium, fueling the creation of new stellar objects.
Why is iron significant in our understanding of why a Type II supernova explodes?
When a star has exhausted its supply of elements below iron the fusion process is no longer able to prevent the outer layers from collapsing in towards the core. If the star is sufficiently massive it will then eject the outer layers explosively as a supernova.
Where does the energy of a supernova come from?
The short answer is that the energy released in a supernova explosion comes from the gravitational energy released as the star collapses. Think about an object falling from a very high building.
What is the explosive power of a supernova?
A supernova is an explosion of a massive supergiant star. It may shine with the brightness of 10 billion suns! The total energy output may be 1044 joules, as much as the total output of the sun during its 10 billion year lifetime. The likely scenario is that fusion proceeds to build up a core of iron.
Why would you not see a supernova explosion?
A supernova occurs when a very large star exhausts its nuclear fuel. The star collapses, triggering a violent explosion. Unfortunately, supernovae visible to the naked eye are rare. One occurs in our galaxy every few hundred years, so there is no guarantee you will ever see one in our galaxy in your lifetime.