Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-05-23
Astrophys.J. 580 (2002) L39-L42
Astronomy and Astrophysics
Astrophysics
7 pages, 3 figures, accepted for publication in the Astrophysical Journal (Letters)
Scientific paper
10.1086/345545
We present spectropolarimetry of the Type Ic supernova SN 2002ap and give a preliminary analysis: the data were taken at two epochs, close to and one month later than the visual maximum (2002 February 8). In addition we present June 9 spectropolarimetry without analysis. The data show the development of linear polarization. Distinct polarization profiles were seen only in the O I \lambda 7773 multiplet/Ca II IR triplet absorption trough at maximum light and in the Ca II IR triplet absorption trough a month later, with the latter showing a peak polarization as high as ~2 %. The intrinsic polarization shows three clear position angles: 80 degs for the February continuum, 120 degs for the February line feature, and 150 degs for the March data. We conclude that there are multiple asymmetric components in the ejecta. We suggest that the supernova has a bulk asymmetry with an axial ratio projected on the sky that is different from 1 by of order 10 %. Furthermore, we suggest very speculatively that a high velocity ejecta component moving faster than ~0.115c (e.g., a jet) contributes to polarization in the February epoch.
Aoki Kaori
Asai Ryo
Deng Jian
Ebizuka Noboru
Inata Motoko
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