Stevance, H.F., Maund, J.R., Baade, D. et al. (8 more authors) (2016) Spectropolarimetry of the Type IIb SN 2008aq. Monthly Notices of the Royal Astronomical Society, 461 (2). pp. 2019-2024. ISSN 0035-8711
Abstract
We present optical spectroscopy and spectropolarimetry of the Type IIb SN 2008aq 16 days and 27 days post-explosion. The spectrum of SN 2008aq remained dominated by Hα 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 signifi- cant levels of continuum polarisation at pcont= 0.70 (± 0.22) % in the first epoch, increasing to pcont=1.21 (± 0.33) % by the second epoch. Moreover, the presence of loops in the q − u planes of Hα and He I in the second epoch suggests a departure from axial symmetry.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2016 Author(s). This is an author produced version of a paper subsequently published in Monthly Notices of the Royal Astronomical Society. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | supernovae:general; supernovae:individual:2008aq |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 01 Aug 2016 11:52 |
Last Modified: | 04 Nov 2016 05:38 |
Published Version: | http://dx.doi.org/10.1093/mnras/stw1479 |
Status: | Published |
Publisher: | Oxford University Press |
Refereed: | Yes |
Identification Number: | 10.1093/mnras/stw1479 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:103157 |