%0 Generic %1 Pan2011 %A Pan, Tony %A Loeb, Abraham %A Kasen, Daniel %D 2011 %K instability pair supernovae %T Pair-Instability Supernovae via Collision Runaway in Young Dense Star Clusters %U http://arxiv.org/abs/1111.3648 %X Stars with helium cores between ~64 and 133 M_sun are theoretically predicted to die as pair-instability supernovae. This requires very massive progenitors, which are theoretically prohibited for Pop II/I stars within the Galactic stellar mass limit due to mass loss via line-driven winds. However, the runaway collision of stars in a dense, young star cluster could create a merged star with sufficient mass to end its life as a pair-instability supernova, even with enhanced mass loss at non-zero metallicity. We show that the predicted rate from this mechanism is consistent with the inferred volumetric rate of roughly ~2x10^-9 Mpc^-3 yr^-1 of the two observed pair-instability supernovae, SN 2007bi and PTF 10nmn, neither of which have metal-free host galaxies. Contrary to prior literature, only pair-instability supernovae at low redshifts z<2 will be observable with the Large Synoptic Survey Telescope (LSST). We estimate the telescope will observe ~10^2 such events per year that originate from the collisional runaway mergers in clusters.

@misc{Pan2011, abstract = { Stars with helium cores between ~64 and 133 M_sun are theoretically predicted to die as pair-instability supernovae. This requires very massive progenitors, which are theoretically prohibited for Pop II/I stars within the Galactic stellar mass limit due to mass loss via line-driven winds. However, the runaway collision of stars in a dense, young star cluster could create a merged star with sufficient mass to end its life as a pair-instability supernova, even with enhanced mass loss at non-zero metallicity. We show that the predicted rate from this mechanism is consistent with the inferred volumetric rate of roughly ~2x10^-9 Mpc^-3 yr^-1 of the two observed pair-instability supernovae, SN 2007bi and PTF 10nmn, neither of which have metal-free host galaxies. Contrary to prior literature, only pair-instability supernovae at low redshifts z<2 will be observable with the Large Synoptic Survey Telescope (LSST). We estimate the telescope will observe ~10^2 such events per year that originate from the collisional runaway mergers in clusters. }, added-at = {2011-11-17T16:29:54.000+0100}, author = {Pan, Tony and Loeb, Abraham and Kasen, Daniel}, biburl = {https://www.bibsonomy.org/bibtex/277299667d08e0b1a52d9106d19563535/miki}, description = {[1111.3648] Pair-Instability Supernovae via Collision Runaway in Young Dense Star Clusters}, interhash = {a56bf697c3f074e38370a2bbe19ebcfd}, intrahash = {77299667d08e0b1a52d9106d19563535}, keywords = {instability pair supernovae}, note = {cite arxiv:1111.3648Comment: 5 pages, 4 figures}, timestamp = {2011-11-17T16:29:54.000+0100}, title = {Pair-Instability Supernovae via Collision Runaway in Young Dense Star Clusters}, url = {http://arxiv.org/abs/1111.3648}, year = 2011 }