It’s slowly becoming clear that core collapse supernovae blow up without any warnings. A recent study has shown that almost all supernova progenitors show no sign of variability right up to the time they explode. To make matters more difficult, the progenitor stars for core collapse supernovae come in all colours of the rainbow.

The to top it all off, some 15 to 30% of core collapse stars don’t go supernova at all, but instead quietly fade into a black hole.

That’s a summary of the start of https://arxiv.org/pdf/1609.00022

>>The to top it all off, some 15 to 30% of core collapse stars don’t go supernova at all, but instead quietly fade into a black hole.<<

Sounds more like retirement.

PermeateFree said:

>>The to top it all off, some 15 to 30% of core collapse stars don’t go supernova at all, but instead quietly fade into a black hole.<<

Sounds more like retirement.

Apart from those who die suddenly, the rest just fade out.

While on supernova topics, have you noticed how the names of supernovae have changed recently. See an example in the recent thread http://tokyo3.org/forums/holiday/topics/7913/

That’s because supernovae are now being discovered by assassins Brutus and Cassius.

Huh?

I’ll explain. The All Sky Automated Survey SuperNova team, known as assassins after the acronym ASAS SN, have a telescope in each hemisphere scanning the sky each night for supernovae and other cataclysmic variables. The telescopes have been named Brutus and Cassius. Each telescope has four lenses giving it an enormous field of view. Professional astronomers, unpaid, follow up on the most interesting sightings. They’ve been operating since June 2013, and last year found 150 supernovae. So now supernovae get called ASAS SN 14i for example, instead of the older name of SN 2014i.

More on http://www.astronomy.ohio-state.edu/~assassin/index.shtml

mollwollfumble said:

It’s slowly becoming clear that core collapse supernovae blow up without any warnings. A recent study has shown that almost all supernova progenitors show no sign of variability right up to the time they explode. To make matters more difficult, the progenitor stars for core collapse supernovae come in all colours of the rainbow.

The to top it all off, some 15 to 30% of core collapse stars don’t go supernova at all, but instead quietly fade into a black hole.

That’s a summary of the start of https://arxiv.org/pdf/1609.00022

Very interesting, but the paper seems to be dealing only with e/m warnings. The findings don’t preclude, for instance, a warning in the form of anomalous neutrino radiation.

dv said:

mollwollfumble said:

It’s slowly becoming clear that core collapse supernovae blow up without any warnings. A recent study has shown that almost all supernova progenitors show no sign of variability right up to the time they explode. To make matters more difficult, the progenitor stars for core collapse supernovae come in all colours of the rainbow.

The to top it all off, some 15 to 30% of core collapse stars don’t go supernova at all, but instead quietly fade into a black hole.

That’s a summary of the start of https://arxiv.org/pdf/1609.00022

Very interesting, but the paper seems to be dealing only with e/m warnings. The findings don’t preclude, for instance, a warning in the form of anomalous neutrino radiation.

Um, that’s right, but given that the number of supernovae seen in neutrinos is currently just two …

mollwollfumble said:

dv said:

mollwollfumble said:

It’s slowly becoming clear that core collapse supernovae blow up without any warnings. A recent study has shown that almost all supernova progenitors show no sign of variability right up to the time they explode. To make matters more difficult, the progenitor stars for core collapse supernovae come in all colours of the rainbow.

The to top it all off, some 15 to 30% of core collapse stars don’t go supernova at all, but instead quietly fade into a black hole.

That’s a summary of the start of https://arxiv.org/pdf/1609.00022

Very interesting, but the paper seems to be dealing only with e/m warnings. The findings don’t preclude, for instance, a warning in the form of anomalous neutrino radiation.

Um, that’s right, but given that the number of supernovae seen in neutrinos is currently just two …

Early days early days