Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-10-03
Astronomy and Astrophysics
Astrophysics
Invited talk at the ``GAMMA2001'' Symposium, April 4-6, 2001, Baltimore. To be published in ``Gamma-Ray Astronomy 2001'' (Amer
Scientific paper
10.1063/1.1419452
We review the characteristics of nucleosynthesis and radioactivities in 'Hypernovae', i.e., supernovae with very large explosion energies ($ \gsim 10^{52} $ ergs) and their $\gamma$-ray line signatures. We also discuss the $^{44}$Ti line $\gamma$-rays from SN1987A and the detectability with INTEGRAL. Signatures of hypernova nucleosynthesis are seen in the large [(Ti, Zn)/Fe] ratios in very metal poor stars. Radioactivities in hypernovae compared to those of ordinary core-collapse supernovae show the following characteristics: 1) The complete Si burning region is more extended, so that the ejected mass of $^{56}$Ni can be much larger. 2) Si-burning takes place in higher entropy and more $\alpha$-rich environment. Thus the $^{44}$Ti abundance relative to $^{56}$Ni is much larger. In aspherical explosions, $^{44}$Ti is even more abundant and ejected with velocities as high as $\sim$ 15,000 km s$^{-1}$, which could be observed in $\gamma$-ray line profiles. 3) The abundance of $^{26}$Al is not so sensitive to the explosion energy, while the $^{60}$Fe abundance is enhanced by a factor of $\sim$ 3.
Kumagai Shiomi
Maeda Kengo
Mochizuki Yoneko
Nakamura Takashi
Nomoto Ken
No associations
LandOfFree
Gamma-Ray Signatures of Supernovae and Hypernovae does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Gamma-Ray Signatures of Supernovae and Hypernovae, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gamma-Ray Signatures of Supernovae and Hypernovae will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-474686