Kavli Affiliate: Shunsaku Horiuchi
| First 5 Authors: Sean Heston, Nick Ekanger, Shunsaku Horiuchi, ,
| Summary:
We examine the detectability of $gamma$-ray emission originating from the
radioactive decays of unstable nuclei that are synthesized in relativistic
outflows launched in magneto-rotational core-collapse supernovae. The observed
lines have enhanced energies due to the Lorentz boosted nuclei and can also be
seen until later times due to time dilation of the rest-frame half-lives. We
find that instruments like $textit{e-ASTROGAM}$ and $textit{INTEGRAL/SPI}$
are sensitive to these boosted line emissions from 100s of keV to 10s of MeV at
a distance of 10 kpc over time scales of 10s of days. For favorable viewing
angles, these decays can be detected to extragalactic distances for rapidly
spinning proto-magnetar models. On the other hand, detection for off-axis jets
is challenging, even for a supernova at the galactic center. Measuring multiple
decay lines in addition to the integrated luminosity over $sim$10 days
post-bounce would allow for the ability to distinguish between models and shed
light on central engine properties like magnetic field and spin.
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