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The aspherical explosion of the Type IIP SN 2017gmr
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Number of Authors: 102019 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 489, no 1, p. L69-L74Article in journal (Refereed) Published
Abstract [en]

Type IIP supernovae (SNe IIP), which represent the most common class of core-collapse (CC) SNe, show a rapid increase in continuum polarization just after entering the tail phase. This feature can be explained by a highly asymmetric helium core, which is exposed when the hydrogen envelope becomes transparent. Here we report the case of an SN IIP (SN 2017 gmr) that shows an unusually early rise of the polarization, greater than or similar to 30 d before the start of the tail phase. This implies that SN 2017gmr is an SN IIP that has very extended asphericity. The asymmetries are not confined to the helium core, but reach out to a significant part of the outer hydrogen envelope, hence clearly indicating a marked intrinsic diversity in the aspherical structure of CC explosions. These observations provide new constraints on the explosion mechanism, where viable models must be able to produce such extended deviations from spherical symmetry, and account for the observed geometrical diversity.

Place, publisher, year, edition, pages
2019. Vol. 489, no 1, p. L69-L74
Keywords [en]
techniques: polarimetric, supernovae: general, supernovae: individual: SN 2017gmr
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-175843DOI: 10.1093/mnrasl/slz119ISI: 000491355100013OAI: oai:DiVA.org:su-175843DiVA, id: diva2:1369958
Available from: 2019-11-13 Created: 2019-11-13 Last updated: 2019-11-13Bibliographically approved

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Bulla, Mattia
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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