A Type II supernova or SNII[1] (plural: supernovae) results from the rapid collapse and violent explosion of a massive star. A star must have at least eight times, but no more than 40 to 50 times, the mass of the Sun (M☉) to undergo this type of explosion. [2] .

SN 1987A was a type II supernova in the Large Magellanic Cloud, a dwarf satellite galaxy of the Milky Way. It occurred approximately 51.4 kiloparsecs (168,000 light-years) [a] from Earth and was the closest observed supernova since Kepler's Supernova in 1604.

Dec 10, 2024 · Type II These supernovae occur at the end of a massive star's lifetime, when its nuclear fuel is exhausted and it is no longer supported by the release of nuclear energy. If the star's iron core is massive enough, it will collapse and become a supernova.

Nov 8, 2023 · Emerging from theories dating back to 1980, electron-capture supernovae, sometimes classified as Type III supernovae, are reserved for stars of 8 to 10 solar masses.

The supernovae of type II can also be sub-divided based on their spectra. While most type II supernovae show very broad emission lines which indicate expansion velocities of many thousands of kilometres per second, some, such as SN 2005gl, have relatively narrow features in their spectra. These are called type IIn, where the "n" stands for ...

Jun 19, 2023 · Type I supernova: A star accumulates matter from a nearby neighbor until a runaway nuclear reaction ignites. Type II supernova: A star runs out of nuclear fuel and collapses under its own...

Gravitational collapse converts gravitational potential energy into internal and thermal energy in the protoneutron star. This energy is the same as the Sun’s power output over 2500 Gyr. The luminosity at peak of a Type II supernova is about 1043 erg/s. It is brightest for about a month and therefore radiates about 1049 erg.

In supernova: Type II supernovae. The so-called classic explosion, associated with Type II supernovae, has as progenitor a very massive star (a Population I star) of at least eight solar masses that is at the end of its active lifetime. (These are seen only in spiral galaxies,… Read More; cosmic rays. In cosmic ray: Origin of cosmic rays

Recognised as a distinct type of supernova in the early 1940s, Type II (SNII) are characterised by hydrogen emission in their spectra, and light curve shapes that differ significantly from those of Type I supernovae.

Type II supernovae have less sharp peaks at maxima and peak at about 1 billion solar luminosities. They die away more sharply than the Type I. Type II supernovae are not observed to occur in elliptical galaxies, and are thought to occur in Population I …