
Originally Posted by
Nereid
The INTEGRAL SPI team has made an independent estimate of the rate at which SN occur, in the Milky Way.
Thanks for the source. They estimate at this time (may change with continued precision over next seven years) a rate of 1 SN every 50 years which results in 20,000 every million years, or 200,000 every 10 million years. That is a fairly sizable rate in those terms.
As they state:
"Using ESA’s Integral observatory, an international team of researchers has been able to confirm the production of radioactive aluminium (Al 26) in massive stars and supernovae throughout our galaxy and determine the rate of supernovae - one of its key parameters."
So (Al 26) as a key parameter associated with SN's in massive stars. There is also the theory of age/ionization limit reached by much lower mass stars that results in SN's which, for example, leads to F-type, G-type and M-type (red dwarf) binaries and planetary systems that we know exist. But that's applying RST principles.
Here's is something that's interesting and relevant.
They state the significant presence of (Al 26) in our early solar system and its possible origin:
"Many scientists were surprised, because at the end of the 1970s, traces of Al 26 decay had only been found in meteorite samples originating from the early Solar System. This was interpreted as evidence that the Al 26 radioactivity was a key ingredient in the formation of planetary bodies (radioactive heat is a necessary to melt cometary material to form rocks), and that Al 26 radioactivity was intimately related to the early Solar System. From the theories of the 1950s that all chemical elements were produced inside stars, novae, and supernovae, two competing scenarios emerged that are still debated.
Al 26 in the early Solar System could be the result of such stellar processing, occurring, with some enhancement, near the formation site of our Solar System 4500 million years ago. Alternatively, special conditions during the formation of the Solar System could have caused high-energy particle collisions, producing Al 26 locally."
This could be considered as supporting evidence of the SN formation model (but of course not conclusive evidence).