The shape of SN 1993J re-analysed

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dc.contributor.authorStevance, H. F.
dc.contributor.authorBaade, D.
dc.contributor.authorBruten, J. R.
dc.contributor.authorCikota, A.
dc.contributor.authorClocchiatti, Alejandro
dc.contributor.authorHines, D. C.
dc.contributor.authorHöflich, P.
dc.contributor.authorMaund, J. R.
dc.contributor.authorPatat, F.
dc.contributor.authorVallely, P. J.
dc.contributor.authorWheeler, J. C.
dc.date.accessioned2022-03-16T19:39:47Z
dc.date.available2022-03-16T19:39:47Z
dc.date.issued2020
dc.description.abstractSN 1993J is one of the best-studied Type IIb supernovae. Spectropolarimetric data analyses were published over two decades ago at a time when the field of supernova spectropolarimetry was in its infancy. Here, we present a new analysis of the spectropolarimetric data of SN 1993J and an improved estimate of its interstellar polarization (ISP) as well as a critical review of ISP removal techniques employed in the field. The polarization of SN 1993J is found to show significant alignment on the q − u plane, suggesting the presence of a dominant axis and therefore of continuum polarization. We also see strong line polarization features, including H β, He i λ5876, H α, He i λ6678, He i λ7065, and high velocity (HV) components of He i λ5876 and H α. SN 1993J is therefore the second example of a stripped-envelope supernova, alongside iPTF13bvn, with prominent HV helium polarization features, and the first to show a likely HV H α contribution. Overall, we determine that the observed features can be interpreted as the superposition of anisotropically distributed line forming regions over ellipsoidal ejecta. We cannot exclude the possibility of an off-axis energy source within the ejecta. These data demonstrate the rich structures that are inaccessible if solely considering the flux spectra but can be probed by spectropolarimetric observations. In future studies, the new ISP corrected data can be used in conjunction with 3D radiative transfer models to better map the geometry of the ejecta of SN 1993J.
dc.format.extent17 páginas
dc.fuente.origenOUP
dc.identifier.doi10.1093/mnras/staa721
dc.identifier.eissn1365-2966
dc.identifier.issn0035-8711
dc.identifier.urihttps://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=9109096
dc.identifier.urihttps://doi.org/10.1093/mnras/staa721
dc.identifier.wosidWOS:000535885900068
dc.information.autorucInstituto de astrofísica ; Clocchiatti, Alejandro ; 0000-0003-3068-4258 ; 100500
dc.issue.numero1
dc.language.isoen
dc.nota.accesoContenido parcial
dc.pagina.final901
dc.pagina.inicio885
dc.publisherOUP
dc.revistaMON NOT R ASTRON SOCes_ES
dc.revistaMonthly Notices of the Royal Astronomical Society
dc.rightsacceso restringido
dc.subject.ods07 Affordable and Clean Energy
dc.subject.odspa07 Energía asequible y no contaminante
dc.titleThe shape of SN 1993J re-analysedes_ES
dc.typeartículo
dc.volumen494
sipa.codpersvinculados100500
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