Broad band polarimetric investigation of Type IIP supernova 2013ej

Abstract

We present results based on follow-up observations of the Type II-plateau supernova (SN) 2013ej at 6 epochs spanning a total duration of $\sim$37 d. The $R_c$-band linear polarimetric observations were carried out between the end of the plateau and the beginning of the nebular phases as noticed in the photometric light curve. The contribution due to interstellar polarization (ISP) was constrained by using couple of approaches, i.e. based upon the observations of foreground stars lying within 5\arcmin\, and 10$\degr$ radius of the SN location and also investigating the extinction due to the Milky Way and host galaxy towards the SN direction. Our analysis revealed that in general the intrinsic polarization of the SN is higher than the polarization values for the foreground stars and exhibits an increasing trend during our observations. After correcting the ISP of $\sim$0.6 per cent, the maximum intrinsic polarization of SN~2013ej is found to be 2.14 $\pm$ 0.57 per cent. Such a strong polarization has rarely been seen in Type II-P SNe. If this is the case, i.e., the `polarization bias' effect is still negligible, the polarization could be attributed to the asymmetry of the inner ejecta of the SN because the ISP towards the SN location is estimated to be, at most, 0.6 per cent.

12 pages, 6 figures, 5 tables. Accepted for publication in MNRAS

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• Asphericity, Interaction, and Dust in the Type II-P/II-L Supernova 2013ej in Messier 74
• Shock Breakout in 3-Dimensional Red Supergiant Envelopes
• A Comprehensive Analysis of Spitzer Supernovae
• Photometric, polarimetric, and spectroscopic studies of the luminous, slow-decaying Type Ib SN 2012au
• The aspherical explosion of the Type IIP SN 2017gmr
• Luminous type IIP SN 2013ej with high-velocity Ni-56 ejecta
• The disappearances of six supernova progenitors
• On the observational behaviour of the highly polarized Type IIn supernova SN 2017hcc
• A Massive Star's Dying Breaths: Pulsating Red Supergiants and Their Resulting Type IIP Supernovae
• Evidence for multiple origins of fast declining Type II supernovae from spectropolarimetry of SN 2013ej and SN 2017ahn
• Spectropolarimetry of Type II supernovae (II) Intrinsic supernova polarization and its relations with the photometric/spectroscopic properties
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• Circumstellar Light Echo as a Possible Origin of the Polarization of Type IIP Supernovae
• SN 2016B a.k.a ASASSN-16ab: a transitional type II supernova
• Theoretical X-ray light curves of young SNe II: the example of SN 2013ej