Detection of optical linear polarization in the SN2006aj/XRF060218 non-spherical expansion

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dc.creatorGorosabel, J.
dc.creatorLarionov, V.
dc.creatorCastro-Tirado, A. J.
dc.creatorGuziy, S.
dc.creatorLarionova, L.
dc.creatorDel Olmo, A.
dc.creatorMartinez, M. A.
dc.creatorCepa, J.
dc.creatorCedres, B.
dc.creatorPostigo, A. de Ugarte
dc.creatorJelinek, M.
dc.creatorBogdanov, O.
dc.creatorLLorente, A.
dc.date2006-09-27
dc.date2006-09-28
dc.date.accessioned2026-07-07T07:34:25Z
dc.date.available2026-07-07T07:34:25Z
dc.descriptionWe have performed optical polarimetric observations of the SN2006aj associated to the X-ray flash (XRF) of February 18, 2006, XRF060218 that provide information on its expansion geometry. The data were acquired in the R-band with the 0.7m telescope of Crimea, 2.5m Nordic Optical Telescope and the 2.2m of Calar Alto. We report the detection of linear polarization between 3 and 39 days after the gamma-ray event (t-t_0). This represents the first polarization detection of a Ic supernova (SN) associated to an XRF. Our data exhibit a degree of linear polarization (P) around P~4% at t-t_0 ~ 3-5 days, followed by a constant polarization phase with P~1.4% at 13.7 < t-t_0 < 39 days. Our data suggest a decay in P, and more interestingly, show a position angle (θ) rotation of ~100 degrees comparing data taken before and after the R-band lightcurve peak. The reported polarization measurements can be explained by the evolution of an asymmetric SN expansion. We discuss on several ingredients that could account for the observed θrotation.
dc.descriptionSubmitted to A&A. Revised version, comments of the referee included. 4 pages, 3 figures
dc.identifierhttps://arxiv.org/abs/astro-ph/0609761
dc.identifierhttp://arxiv.org/abs/astro-ph/0609761
dc.identifierAstron.Astrophys. 459 (2006) L33-L36
dc.identifierdoi:10.1051/0004-6361:20066391
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/119762
dc.subjectAstrophysics
dc.titleDetection of optical linear polarization in the SN2006aj/XRF060218 non-spherical expansion
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