Aspherical Core-Collapse Supernovae In Red Supergiants Powered By Nonrelativistic Jets

dc.contributor.utaustinauthorCouch, Sean M.en_US
dc.contributor.utaustinauthorWheeler, J. Craigen_US
dc.contributor.utaustinauthorMilosavljevic, Milosen_US
dc.creatorCouch, Sean M.en_US
dc.creatorWheeler, J. Craigen_US
dc.creatorMilosavljevic, Milosen_US
dc.date.accessioned2016-04-28T22:21:55Z
dc.date.available2016-04-28T22:21:55Z
dc.date.issued2009-05en
dc.description.abstractWe explore the observational characteristics of jet-driven supernovae (SNe) by simulating bipolar-jet-driven explosions in a red supergiant (RSG) progenitor. We present results of four models in which we hold the injected kinetic energy at a constant 10(51) erg across all jet models but vary the specific characteristics of the jets to explore the influence of the nature of jets on the structure of the SN ejecta. We evolve the explosions past shock-breakout and into quasi-homologous expansion of the SN envelope into a RSG wind. The simulations have sufficient numerical resolution to study the stability of the flow. Our simulations show the development of fluid instabilities that produce pristine helium clumps in the hydrogen envelope. The oppositely directed, nickel-rich jets give a large-scale asymmetry that may account for the nonspherical excitation and substructure of spectral lines such as H alpha and Hc I 10830 angstrom. Jets with a large fraction of kinetic to thermal energy punch through the progenitor envelope and give rise to explosions that would be observed to be asymmetric from the earliest epochs, inconsistent with spectropolarimetric measurements of Type II SNe. Jets with higher thermal energy fractions result in explosions that are roughly spherical at large radii but are significantly elongated at smaller radii, deep inside the ejecta, in agreement with the polarimetric observations. We present shock-breakout light curves that indicate that strongly aspherical shock breakouts are incompatible with recent Galaxy Evolution Explorer observations of shock breakout from RSG stars. Comparison with observations indicates that jets must deposit their kinetic energy efficiently throughout the ejecta while in the hydrogen envelope. Thermal-energy-dominated jets satisfy this criterion and yield many of the observational characteristics of Type II SNe.en_US
dc.description.departmentAstronomyen_US
dc.description.sponsorshipNSF AST-0707769en_US
dc.description.sponsorshipNASA NNG04GL00Gen_US
dc.identifierdoi:10.15781/T2GR81
dc.identifier.Filename2009_05_asphericalcore.pdfen_US
dc.identifier.citationCouch, Sean M., J. Craig Wheeler, and Miloレ Milosavljevi?. "Aspherical core-collapse supernovae in red supergiants powered by nonrelativistic jets." The Astrophysical Journal, Vol. 696, No. 1 (May., 2009): 953.en_US
dc.identifier.doi10.1088/0004-637x/696/1/953en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/35202
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialAstrophysical Journalen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.rights.restrictionOpenen_US
dc.subjecthydrodynamicsen_US
dc.subjectinstabilitiesen_US
dc.subjectshock wavesen_US
dc.subjectsupernovae: generalen_US
dc.subjectnonspherical coreen_US
dc.subjectaxisymmetrical simulationsen_US
dc.subjectobservationalen_US
dc.subjectconsequencesen_US
dc.subjectasymmetric supernovaeen_US
dc.subjectshock breakouten_US
dc.subjectline-profilesen_US
dc.subjectni-56 ejectaen_US
dc.subjectexplosionsen_US
dc.subjecthydrodynamicsen_US
dc.subjectspectropolarimetryen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleAspherical Core-Collapse Supernovae In Red Supergiants Powered By Nonrelativistic Jetsen_US
dc.typeArticleen_US

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