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dc.contributor.authorHoffman, Jennifer L.
dc.contributor.authorLeonard, Douglas C.
dc.contributor.authorChornock, Ryan T.
dc.contributor.authorFilippenko, Alexei V.
dc.contributor.authorBarth, Aaron J.
dc.contributor.authorMatheson, Thomas
dc.date.accessioned2013-05-07T14:24:22Z
dc.date.issued2008
dc.identifier.citationHoffman, Jennifer L., Douglas C. Leonard, Ryan Chornock, Alexei V. Filippenko, Aaron J. Barth, and Thomas Matheson. 2008. The dual-axis circumstellar environment of the type IIn supernova 1997eg. Astrophysical Journal 688(2): 1186.en_US
dc.identifier.issn1538-4357en_US
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:10611670
dc.description.abstractWe present multi-epoch spectral and spectropolarimetric observations of the Type IIn supernova (SN) 1997eg that indicate the presence of a flattened disk-like concentration of circumstellar material surrounding nonspherical ejecta, with which the disk is misaligned. The polarization across the broad H\(\alpha\), H\(\beta\), and He I \(\lambda\)5876 lines of SN 1997eg forms closed loops when viewed in the Stokes q-u plane. Such loops occur when the geometrical symmetry of one or both of the Stokes parameters across spectral lines is broken, in this case most likely by occultation of the ejecta by the equatorial circumstellar matter concentration. The polarization of the narrow Balmer lines possesses an intrinsic axis that differs by 12 degrees from that of the elongated ejecta and probably indicates the orientation of the disk-like circumstellar material. The existence of two different axes of symmetry in SN 1997eg suggests that neither rotation of the progenitor nor the influence of a companion star can be the sole mechanism creating a preferred axis within the supernova system. Our model supports the emerging hypothesis that the progenitors of some Type IIn supernovae are luminous blue variable stars, whose pre-supernova mass eruptions form the circumstellar shells that physically characterize the SN IIn subclass. These conclusions, which are independent of interstellar polarization effects, would have been unobservable with only a single epoch of spectropolarimetry.en_US
dc.description.sponsorshipOther Research Uniten_US
dc.language.isoen_USen_US
dc.publisherInstitute of Physicsen_US
dc.relation.isversionof10.1086/592261en_US
dash.licenseLAA
dc.subjectcircumstellar matteren_US
dc.subjectpolarizationen_US
dc.subjectstarsen_US
dc.subjectmass lossen_US
dc.subjectsupernovaeen_US
dc.subjectindividual (SN 1997eg)en_US
dc.subjecttechniquesen_US
dc.subjectpolarimetricen_US
dc.titleThe Dual-Axis Circumstellar Environment of the Type IIn Supernova 1997egen_US
dc.typeJournal Articleen_US
dc.description.versionAuthor's Originalen_US
dc.relation.journalAstrophysical Journalen_US
dash.depositing.authorChornock, Ryan T.
dc.date.available2013-05-07T14:24:22Z
dc.identifier.doi10.1086/592261*
dash.contributor.affiliatedChornock, R


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