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On the observational behaviour of the highly polarized Type IIn supernova SN 2017hcc

Kumar, B and Eswaraiah, C and Singh, A and Sahu, DK and Anupama, GC and Kawabata, KS and Yamanaka, M and Otsubo, I and Pandey, SB and Nakaoka, T and Kawabata, M and Aryan, A and Akitaya, H (2019) On the observational behaviour of the highly polarized Type IIn supernova SN 2017hcc. In: Monthly Notices of the Royal Astronomical Society, 488 (3). pp. 3089-3099.

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Official URL: https://dx.doi.org/10.1093/mnras/stz1914


We present the results based on photometric (Swift UVOT), broad-band polarimetric (V and R bands) and optical spectroscopic observations of the Type IIn supernova (SN) 2017hcc. Our study is supplemented with spectropolarimetric data available in literature for this event. The post-peak light-curve evolution is slow (�0.2 mag 100 d�1 in b band). The spectrum of �+27 d shows a blue continuum with narrow emission lines, typical of a Type IIn SN. Archival polarization data along with the Gaia DR2 distances have been utilized to evaluate the interstellar polarization (ISP) towards the SN direction which is found to be PISP = 0.17 ± 0.02 per cent and θISP = 140� ± 3�. To extract the intrinsic polarization of SN 2017hcc, both the observed and the literature polarization measurements were corrected for ISP. We noticed a significant decline of �3.5 per cent (V band) in the intrinsic level of polarization spanning a period of �2 months. In contrast, the intrinsic polarization angles remain nearly constant at all epochs. Our study indicates a substantial variation in the degree of asymmetry in either the ejecta and/or the surrounding medium of SN 2017hcc. We also estimate a mass-loss rate of M = 0.12 M yr�1 (for vw = 20 km s�1) which suggests that the progenitor of SN 2017hcc is most likely a luminous blue variable. © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Item Type: Journal Article
Publication: Monthly Notices of the Royal Astronomical Society
Publisher: Oxford University Press
Additional Information: copyright of this article belongs to Oxford University Press
Keywords: Supernovae: generalSupernovae: individual: SN 2017hccTechniques: photometricTechniques: polarimetricTechniques: spectroscopic
Department/Centre: Division of Physical & Mathematical Sciences > Joint Astronomy Programme
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 02 Nov 2021 11:57
Last Modified: 02 Nov 2021 11:57
URI: http://eprints.iisc.ac.in/id/eprint/65142

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