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dc.creatorBen-Ami, Sagien_US
dc.creatorHachinger, Stephanen_US
dc.creatorGal-Yam, Avishayen_US
dc.creatorMazzali, Paolo A.en_US
dc.creatorFilippenko, Alexei V.en_US
dc.creatorHoresh, Assafen_US
dc.creatorMatheson, Thomasen_US
dc.creatorModjaz, Maryamen_US
dc.creatorSauer, Daniel N.en_US
dc.creatorSilverman, Jeffrey M.en_US
dc.creatorSmith, Nathanen_US
dc.creatorYaron, Oferen_US
dc.date.accessioned2016-04-28T19:34:26Z
dc.date.available2016-04-28T19:34:26Z
dc.date.issued2015-04en
dc.identifierdoi:10.15781/T2RB9R
dc.identifier.citationBen-Ami, Sagi, Stephan Hachinger, Avishay Gal-Yam, Paolo A. Mazzali, Alexei V. Filippenko, Assaf Horesh, Thomas Matheson et al. "Ultraviolet Spectroscopy of Type IIb Supernovae: Diversity and the Impact of Circumstellar Material." The Astrophysical Journal, Vol. 803, No. 1 (Mar., 2015): 40.en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/34782
dc.description.abstractWe present new Hubble Space Telescope (HST) multi-epoch ultraviolet (UV) spectra of the bright Type IIb SN 2013df, and undertake a comprehensive analysis of the set of four SNe IIb for which HST UV spectra are available (SN 1993J, SN 2001ig, SN 2011dh, and SN 2013df). We find strong diversity in both continuum levels and line features among these objects. We use radiative-transfer models that fit the optical part of the spectrum well, and find that in three of these four events we see a UV continuum flux excess, apparently unaffected by line absorption. We hypothesize that this emission originates above the photosphere, and is related to interaction with circumstellar material (CSM) located in close proximity to the SN progenitor. In contrast, the spectra of SN 2001ig are well fit by single-temperature models, display weak continuum and strong reverse-fluorescence features, and are similar to spectra of radioactive 56Ni-dominated SNe Ia. A comparison of the early shock-cooling components in the observed light curves with the UV continuum levels which we assume trace the strength of CSM interaction suggests that events with slower cooling have stronger CSM emission. The radio emission from events having a prominent UV excess is perhaps consistent with slower blast-wave velocities, as expected if the explosion shock was slowed down by the CSM that is also responsible for the strong UV, but this connection is currently speculative as it is based on only a few events.en_US
dc.description.sponsorshipMinerva ARCHES awarden_US
dc.description.sponsorshipNASA PF0000,NAS8-03060en_US
dc.description.sponsorshipChandra X-ray Centeren_US
dc.description.sponsorshipISFen_US
dc.description.sponsorshipBSFen_US
dc.description.sponsorshipGIFen_US
dc.description.sponsorshipMinervaen_US
dc.description.sponsorshipFP7/ERC 307260en_US
dc.description.sponsorshipKimmel Investigator awarden_US
dc.description.sponsorship"Quantum-universe" I-core program of the planning and budgeting committeeen_US
dc.description.sponsorshipGary & Cynthia Bengieren_US
dc.description.sponsorshipRichard & Rhoda Goldman Funden_US
dc.description.sponsorshipSylvia & Jim Katzman Foundationen_US
dc.description.sponsorshipChristopher R. Redlich Funden_US
dc.description.sponsorshipTABASGO Foundationen_US
dc.description.sponsorshipNSF AST-1211916en_US
dc.description.sponsorshipNASA/HST from the Space Telescope Science Institute GO-13030en_US
dc.description.sponsorshipAssociation of Universities for Research in Astronomy, Inc., under NASA NAS 05-26555en_US
dc.description.sponsorshipNSF Astronomy and Astrophysics Postdoctoral Fellowship AST-1302771en_US
dc.language.isoEnglishen_US
dc.relation.ispartofen_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: generalen_US
dc.subjectsupernovae: individual (type iib)en_US
dc.subjectcore-collapse supernovaeen_US
dc.subjectmass-loss rateen_US
dc.subjectsn 1993jen_US
dc.subjectsupergianten_US
dc.subjectprogenitoren_US
dc.subjectlight-curveen_US
dc.subjectbinary progenitoren_US
dc.subjectia supernovaeen_US
dc.subjectx-rayen_US
dc.subjectiben_US
dc.subjectsupernovaeen_US
dc.subjectstellar winden_US
dc.subjectastronomy & astrophysicsen_US
dc.titleUltraviolet Spectroscopy Of Type IIb Supernovae: Diversity And The Impact Of Circumstellar Materialen_US
dc.typeArticleen_US
dc.description.departmentAstronomyen_US
dc.identifier.Filename2015_04_ultravioletspectroscopy.pdfen_US
dc.rights.restrictionOpenen_US
dc.identifier.doi10.1088/0004-637x/803/1/40en_US
dc.contributor.utaustinauthorSilverman, Jeffrey M.en_US
dc.relation.ispartofserialAstrophysical Journalen_US


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