Comprehensive Observations Of The Bright And Energetic Type Lax Sn 2012Z: Interpretation As A Chandrasekhar Mass White Dwarf Explosion

dc.contributor.utaustinauthorG. H. Marionen_US
dc.creatorStritzinger, M. D.en_US
dc.creatorValenti, S.en_US
dc.creatorHoeflich, P.en_US
dc.creatorBaron, E.en_US
dc.creatorPhillips, M. M.en_US
dc.creatorTaddia, F.en_US
dc.creatorFoley, R. J.en_US
dc.creatorHsiao, E. Y.en_US
dc.creatorJha, S. W.en_US
dc.creatorMcCully, C.en_US
dc.creatorPandya, V.en_US
dc.creatorSimon, J. D.en_US
dc.creatorBenetti, S.en_US
dc.creatorBrown, P. J.en_US
dc.creatorBurns, C. R.en_US
dc.creatorCampillay, A.en_US
dc.creatorContreras, C.en_US
dc.creatorForster, F.en_US
dc.creatorHolmbo, S.en_US
dc.creatorMarion, G. H.en_US
dc.creatorMorrell, N.en_US
dc.creatorPignata, G.en_US
dc.description.abstractWe present ultraviolet through near-infrared (NIR) broadband photometry, and visual-wavelength and NIR spectroscopy of the Type lax supernova (SN) 2012Z. The data set consists of both early- and late-time observations, including the first late phase NIR spectrum obtained for a spectroscopically classified SN lax. Simple model calculations of its bolometric light curve suggest SN 2012Z produced similar to 0.3 M-circle dot of Ni-56, ejected about a Chandrasekhar mass of material, and had an explosion energy of similar to 10(51) erg, making it one of the brightest (M-B = -18.3 mag) and most energetic SN Iax yet observed. The late phase (+269d) NIR spectrum of SN 2012Z is found to broadly resemble similar epoch spectra of normal SNe Ia; however, like other SNe Iax, corresponding visual-wavelength spectra differ substantially from all supernova types. Constraints from the distribution of intermediate mass elements, e.g., silicon and magnesium, indicate that the outer ejecta did not experience significant mixing during or after burning, and the late phase NIR line profiles suggests most of the Ni-56 is produced during high density burning. The various observational properties of SN 2012Z are found to be consistent with the theoretical expectations of a Chandrasekhar mass white dwarf progenitor that experiences a pulsational delayed detonation, which produced several tenths of a solar mass of Ni-56 during the deflagration burning phase and little (or no) Ni-56 during the detonation phase. Within this scenario only a moderate amount of Rayleigh-Taylor mixing occurs both during the deflagration and fallback phase of the pulsation, and the layered structure of the intermediate mass elements is a product of the subsequent denotation phase. The fact that the SNe lax population does not follow a tight brightness-decline relation similar to SNe Ia can then be understood in the framework of variable amounts of mixing during pulsational rebound and variable amounts of Ni-56 production during the early subsonic phase of expansion.en_US
dc.description.sponsorshipDanish Agency for Science and Technology and Innovationen_US
dc.description.sponsorshipInstrument Center for Danish Astrophysics (IDA)en_US
dc.description.sponsorshipNSF AST-0306969, AST-0607438, AST-1008343, AST-22111, AST-23432, AST-0707704en_US
dc.description.sponsorshipPRIN-INAF >Transient Universe: from ESO Large to PESSTO>en_US
dc.description.sponsorshipMillennium Institute of Astrophysics (MAS) of the Programa Iniciativa Cientifica Milenio del Ministerio de Economia, Fomento y Turismo de Chile IC120009en_US
dc.description.sponsorshipNational Aeronautics and Space Administrationen_US
dc.identifier.citationStritzinger, M. D., S. Valenti, P. Hoeflich, E. Baron, M. M. Phillips, Francesco Taddia, R. J. Foley et al. >Comprehensive observations of the bright and energetic Type Iax SN 2012Z: Interpretation as a Chandrasekhar mass white dwarf explosion.> Astronomy & Astrophysics, Vol. 573 (2015): A2.en_US
dc.relation.ispartofserialAstronomy & Astrophysicsen_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.subjectsupernovae: individual: sn 2012zen_US
dc.subjectsupernovae: individual: sn 2005hken_US
dc.subjectsupernovae: generalen_US
dc.subjectcarnegie supernova projecten_US
dc.subjectcore-collapse supernovaen_US
dc.subjectphotometry data releaseen_US
dc.subjectia supernovaeen_US
dc.subjectlight curvesen_US
dc.subjectthermonuclear supernovaeen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleComprehensive Observations Of The Bright And Energetic Type Lax Sn 2012Z: Interpretation As A Chandrasekhar Mass White Dwarf Explosionen_US
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