The Neutrino Mechanism of Core-Collapse Supernovae
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The Ohio State University / OhioLINK
2013
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=osu1373628553 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-osu13736285532021-08-03T06:18:26Z The Neutrino Mechanism of Core-Collapse Supernovae Pejcha, Ondrej Astronomy Astrophysics astronomy supernovae neutrino The core of a massive star at the end of its life collapses and launches an outgoing shockwave. Simulations show that the shock wave evolves into a quasi-static accretion shock, but it proves difficult to revive its outward propagation. The stalled accretion shock turns into explosion when the neutrino luminosity from the collapsed core exceeds a critical value (<i>L</i><sup>crit</sup>) (the "neutrino mechanism").I study the physics of <i>L</i><sup>crit</sup> and its parameter dependence. I quantify the connection between the steady-state isothermal accretion flows with bounding shocks and the neutrino mechanism. I show that there is a maximum, critical sound speed <i>c<sub>T</sub></i><sup>crit</sup> above which it is impossible to maintain accretion with a standoff shock. I derive this "antesonic" condition, which characterizes the transition to explosion over a broad range in accretion rate, proto-neutron star properties and microphysics. Additionally, I characterize the effects of collective neutrino oscillations on <i>L</i><sup>crit</sup>, which can decrease <i>L</i><sup>crit</sup> by a sizeable amount. However, I find that collective neutrino oscillations are generally suppressed by matter effects.The physics of the explosion mechanism and the progenitor structure are imprinted in the observed properties of the explosion and the compact remnants. I present preliminary study combining the formalism of critical neutrino luminosity with time evolution of a range of progenitor stars. I construct a semi-analytic model of supernovae that ties together the mass function of the compact remnants with the rate of successful explosions. Both of these quantities can be constrained by observations.I use Bayesian analysis to compare the double neutron star mass distribution with supernova explosion models. I infer the properties of the progenitor binary population and fallback during the explosion. I constrain the mass coordinate where the explosion develops, which has direct implications for the mechanism of supernova explosions. 2013-09-13 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1373628553 http://rave.ohiolink.edu/etdc/view?acc_num=osu1373628553 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
| collection |
NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Astronomy Astrophysics astronomy supernovae neutrino |
| spellingShingle |
Astronomy Astrophysics astronomy supernovae neutrino Pejcha, Ondrej The Neutrino Mechanism of Core-Collapse Supernovae |
| author |
Pejcha, Ondrej |
| author_facet |
Pejcha, Ondrej |
| author_sort |
Pejcha, Ondrej |
| title |
The Neutrino Mechanism of Core-Collapse Supernovae |
| title_short |
The Neutrino Mechanism of Core-Collapse Supernovae |
| title_full |
The Neutrino Mechanism of Core-Collapse Supernovae |
| title_fullStr |
The Neutrino Mechanism of Core-Collapse Supernovae |
| title_full_unstemmed |
The Neutrino Mechanism of Core-Collapse Supernovae |
| title_sort |
neutrino mechanism of core-collapse supernovae |
| publisher |
The Ohio State University / OhioLINK |
| publishDate |
2013 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=osu1373628553 |
| work_keys_str_mv |
AT pejchaondrej theneutrinomechanismofcorecollapsesupernovae AT pejchaondrej neutrinomechanismofcorecollapsesupernovae |
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1719434411031658496 |