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dc.contributor.authorYang, Yi
dc.contributor.authorHoeflich, Peter
dc.contributor.authorBaade, Dietrich
dc.contributor.authorMaund, Justyn R.
dc.contributor.authorWang, Lifan
dc.contributor.authorBrown, Peter. J.
dc.contributor.authorStevance, Heloise F.
dc.contributor.authorArcavi, Iair
dc.contributor.authorBurke, Jamison
dc.contributor.authorCikota, Aleksandar
dc.contributor.authorClocchiatti, Alejandro
dc.contributor.authorGal-Yam, Avishay
dc.contributor.authorGraham, Melissa. L.
dc.contributor.authorHiramatsu, Daichi
dc.contributor.authorHosseinzadeh, Griffin
dc.contributor.authorHowell, D. Andrew
dc.contributor.authorJha, Saurabh W.
dc.contributor.authorMcCully, Curtis
dc.contributor.authorPatat, Ferdinando
dc.contributor.authorSand, David. J.
dc.contributor.authorSchulze, Steve
dc.contributor.authorSpyromilio, Jason
dc.contributor.authorValenti, Stefano
dc.contributor.authorVinkó, József
dc.contributor.authorWang, Xiaofeng
dc.contributor.authorWheeler, J. Craig
dc.contributor.authorYaron, Ofer
dc.contributor.authorZhang, Jujia
dc.date.accessioned2021-01-08T03:38:09Z
dc.date.available2021-01-08T03:38:09Z
dc.date.issued2020-10-09
dc.identifier.citationYang, Y., Hoeflich, P., Baade, D., Maund, J. R., Wang, L., Brown, P. J., ... & Zhang, J. (2020). The young and nearby normal Type Ia supernova 2018gv: UV-optical observations and the earliest spectropolarimetry. The Astrophysical Journal, 902(1), 46.en_US
dc.identifier.issn0004-637X
dc.identifier.doi10.3847/1538-4357/aba759
dc.identifier.urihttp://hdl.handle.net/10150/650667
dc.description.abstractThe nondetection of companion stars in SN Ia progenitor systems lends support to the notion of double-degenerate systems and explosions triggered by the merging of two white dwarfs. This very asymmetric process should lead to a conspicuous polarimetric signature. By contrast, observations consistently find very low continuum polarization as the signatures from the explosion process largely dominate over the pre-explosion configuration within several days. Critical information about the interaction of the ejecta with a companion and any circumstellar matter is encoded in the early polarization spectra. In this study, we obtain spectropolarimetry of SN 2018gv with the ESO Very Large Telescope at -13.6 days relative to theB-band maximum light, or similar to 5 days after the estimated explosion-the earliest spectropolarimetric observations to date of any SN Ia. These early observations still show a low continuum polarization (less than or similar to 0.2%) and moderate line polarization (0.30% 0.04% for the prominent Siii lambda 6355 feature and 0.85% 0.04% for the high-velocity Ca component). The high degree of spherical symmetry implied by the low-line and continuum polarization at this early epoch is consistent with explosion models of delayed detonations and is inconsistent with the merger-induced explosion scenario. The dense UV and optical photometry and optical spectroscopy within the first similar to 100 days after the maximum light indicate that SN 2018gv is a normal SN Ia with similar spectrophotometric behavior to SN 2011fe.en_US
dc.language.isoenen_US
dc.publisherIOP PUBLISHING LTDen_US
dc.rights© 2020. The American Astronomical Society. All rights reserved.en_US
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectpolarizationen_US
dc.subjectgalaxies: individual (NGC 2525)en_US
dc.subjectsupernovae: individual (SN 2018gv)en_US
dc.titleThe Young and Nearby Normal Type Ia Supernova 2018gv: UV-optical Observations and the Earliest Spectropolarimetryen_US
dc.typeArticleen_US
dc.identifier.eissn1538-4357
dc.contributor.departmentUniv Arizona, Steward Observen_US
dc.identifier.journalASTROPHYSICAL JOURNALen_US
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en_US
dc.eprint.versionFinal published versionen_US
dc.source.journaltitleThe Astrophysical Journal
dc.source.volume902
dc.source.issue1
dc.source.beginpage46
refterms.dateFOA2021-01-08T03:38:20Z


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