calcium-rich gap transient
(ca-rich gap transient, ca-rich transient, ca-rich supernova, calcium-rich supernova, calcium-rich transient)
(type of explosive event larger than a nova and smaller than a supernova)
A calcium-rich gap transient (or calcium-rich supernova)
is an observed transient rich in calcium spectral lines,
that (generally?) falls in the gap in luminosity between a
nova and supernova,
Their spectra are similar to Type I b or Type I c supernovae,
but both core-collapse and Type Ia
classifications have problems.
They often appear away from the galaxy center, even beyond
the apparent host galaxy's border.
One idea is they reside in nearby ultra-faint dwarf galaxies.
Another is that they occur in binary stars affected by a
previous supernova that gave them unusual characteristics
causing the spectral differences as well as giving them a velocity kick
to explain their position.
(stars,event type,transient type)
Further reading:
https://en.wikipedia.org/wiki/Calcium-rich_supernova
https://ui.adsabs.harvard.edu/abs/2016MNRAS.458.1768L/abstract
https://ui.adsabs.harvard.edu/abs/2017ApJ...836...60L/abstract
https://ui.adsabs.harvard.edu/abs/2020A%26A...635A.186P/abstract
https://ui.adsabs.harvard.edu/abs/2014ApJ...780L..34M/abstract
https://ui.adsabs.harvard.edu/abs/2012ApJ...755..161K/abstract
https://ui.adsabs.harvard.edu/abs/2022ApJ...927..199D/abstract
https://ui.adsabs.harvard.edu/abs/2023ApJ...944...22Z/abstract
Index