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- W2968576475 abstract "Over the past 30 years, spectropolarimetry has proven to be a great tool to probe the 3D geometry of core collapse supernovae (CCSNe). The number of high-quality multi-epochspectropolarimetric data sets for CCSNe remains quite low, however, due to the challenging nature of such observations. In this work we present and analyse the data of two Type IIb SNe (SN 2008aq – two epochs, SN 2011hs – seven epochs) and one Type Ic-bl (SN 2014ad– seven epochs). The latter is the most complete spectropolarimetric data set for a Type Ic-bl to date.SN 2011hs was found to have a geometry consistent with an off-axis energy source within an ellipsoidal envelope, and features similar to SN 2011dh. In SN 2014ad we showedthe presence of intermediate mass elements in outer parts of the ejecta as well as significantaxi-symmetry, consistent with the presence of a jet. We also provided a re-analysis ofthe Type IIb SN 1993J, including a novel estimate of its interstellar polarisation. Diverseasymmetries were found in all SNe, both in the global geometry of the photosphere and inthe distribution of the line forming regions. They are discussed in the context of previousstudies.In order to simulate the geometry of the ejecta and the resulting observations, we re-created a pre-existing toy model, improving on previous work by devising a way to exploreparameter space methodically. We found that such toy models are prone to degeneracies,and warn that they should be used with great caution, if at all.Spectropolarimetry can also be used to probe asymmetries caused by fast rotation inthe potential progenitors of stripped envelope CCSNe. Although numerous Wolf-Rayetstars of type WN and WC have been observed with spectropolarimetry, no single WO starshave been studied to date. In our data of two Galactic WO stars, we found no line effectand could not sufficiently constrain the rotational velocity to exclude a collapsar scenario.Therefore, the absence of a line effect may not necessarily equate to a low rotational velocity." @default.
- W2968576475 created "2019-08-22" @default.
- W2968576475 creator A5065913022 @default.
- W2968576475 date "2019-04-01" @default.
- W2968576475 modified "2023-09-27" @default.
- W2968576475 title "Spectropolarimetry of stripped envelope core collapse supernovae" @default.
- W2968576475 hasPublicationYear "2019" @default.
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