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Spectropolarimetry of the Type IIb SN 2008aq

Title: Spectropolarimetry Of The Type Iib Sn 2008aq.
Name(s): Stevance, H. F., author
Maund, J. R., author
Baade, D., author
Hoflich, P., author
Patat, F., author
Spyromilio, J., author
Wheeler, J. C., author
Clocchiatti, A., author
Wang, L., author
Yang, Y., author
Zelaya, P., author
Type of Resource: text
Genre: Text
Date Issued: 2016-09-11
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: We present optical spectroscopy and spectropolarimetry of the Type IIb SN 2008aq 16-d and 27-d post-explosion. The spectrum of SN 2008aq remained dominated by Ha P Cygni profile at both epochs, but showed a significant increase in the strength of the helium features, which is characteristic of the transition undergone by supernovae between Type IIb and Type Ib. Comparison of the spectra of SN 2008aq to other Type IIb SNe (SN 1993J, SN 2011dh, and SN 2008ax) at similar epochs revealed that the helium lines in SN 2008aq are much weaker, suggesting that its progenitor was stripped to a lesser degree. SN 2008aq also showed significant levels of continuum polarization at p(cont) = 0.70 (+/- 0.22) per cent in the first epoch, increasing to p(cont) = 1.21 (+/- 0.33) per cent by the second epoch. Moreover, the presence of loops in the q-u planes of Ha and He I in the second epoch suggests a departure from axial symmetry.
Identifier: FSU_libsubv1_wos_000383273600065 (IID), 10.1093/mnras/stw1479 (DOI)
Keywords: 1993j, asphericity, binary companion, core-collapse supernovae, explosion, light curves, optical-spectra, progenitor, spectral evolution, star, supernovae: general, supernovae: individual: 2008aq
Publication Note: The publisher’s version of record is available at
Owner Institution: FSU
Is Part Of: Monthly Notices of the Royal Astronomical Society.
Issue: iss. 2, vol. 461

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Stevance, H. F., Maund, J. R., Baade, D., Hoflich, P., Patat, F., Spyromilio, J., … Zelaya, P. (2016). Spectropolarimetry Of The Type Iib Sn 2008aq. Monthly Notices Of The Royal Astronomical Society.