Optical polarimetry of SN 2004bv

Pereyra, A.; Magalhães, A. M.

doi:10.1051/0004-6361:200500018

Cited by 2 publications

(1 citation statement)

References 14 publications

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“…There are no published spectropolarimetric data for SN 1991T-like or SN 2002cx-like objects to act as a basis for comparison with SN 2005hk, but there are a few relevant measurements. SN 2004bv had an early-time spectrum that showed prominent Fe III lines like SN 1991T (Foley et al 2004), andPereyra &Magalhães (2005) obtained a single epoch of R-band imaging polarimetry two weeks after maximum light. They found a polarization of 0.11% ± 0.02%, consistent with the polarization of the foreground stars in their field and therefore with low intrinsic supernova polarization.…”

Section: Discussionmentioning

confidence: 99%

Spectropolarimetry of the Peculiar Type Ia Supernova 2005hk

Chornock

Filippenko

Branch

et al. 2006

PUBL ASTRON SOC PAC

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130

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We present Keck spectropolarimetry of the unusual type Ia supernova (SN Ia) 2005hk several days before maximum light. An analysis of the high signal-tonoise-ratio total-flux spectrum shows the object's extreme similarity to the peculiar SN 2002cx. SN 2005hk has an optical spectrum dominated by Fe III lines and only weak lines of intermediate-mass elements, unlike a normal SN Ia at this epoch. The photospheric velocity measured from the minima of strong absorption lines is very low for an SN Ia (∼6000 km s −1 ), solidifying the connection to SN 2002cx. The spectrum-synthesis code Synow was used to identify the presence of iron-peak elements, intermediate-mass elements, and possibly unburned carbon at similar velocities in the outer ejecta of SN 2005hk. Many weak spectral features remain unidentified. The spectropolarimetry shows a low level of continuum polarization (∼0.4%) after correction for the interstellar component and only a weak Fe III line feature is detected. The level of continuum polarization is normal for an SN Ia, implying that the unusual features of SN 2005hk cannot be readily explained by large asymmetries.

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Section: Discussionmentioning

confidence: 99%

Spectropolarimetry of the Peculiar Type Ia Supernova 2005hk

Chornock

Filippenko

Branch

et al. 2006

PUBL ASTRON SOC PAC

100

130

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Optical polarimetric monitoring of the type II-plateau SN 2005af

Pereyra¹,

Magalhães²,

Rodrigues

et al. 2006

A&A

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Aims. Core-collapse supernovae may show significant polarization that implies non-spherically symmetric explosions. We observed the type II-plateau SN 2005af using optical polarimetry in order to verify whether any asphericity is present in the supernova temporal evolution. Methods. We used the IAGPOL imaging polarimeter to obtain optical linear polarization measurements in R (five epochs) and V (one epoch) broadbands. Interstellar polarization was estimated from the field stars in the CCD frames. The optical polarimetric monitoring began around one month after the explosion and lasted ∼30 days, between the plateau and the early nebular phase. Results. The weighted mean observed polarization in R band was [1.89 ± 0.03]% at position angle (PA) 54.• 1. After foreground subtraction, the level of the average intrinsic polarization for SN 2005af was ∼0.5% with a slight enhancement during the plateau phase and a decline at early nebular phase. A rotation in PA on a time scale of days was also observed. The polarimetric evolution of SN 2005af in the observed epochs is consistent with an overall asphericity of ∼20% and an inclination of ∼30• . Evidence for a more complex, evolving asphericity, possibly involving clumps in the SN 2005af envelope, is found.

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Optical polarimetry of SN 2004bv

Cited by 2 publications

References 14 publications

Spectropolarimetry of the Peculiar Type Ia Supernova 2005hk

Spectropolarimetry of the Peculiar Type Ia Supernova 2005hk

Optical polarimetric monitoring of the type II-plateau SN 2005af

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