Please use this identifier to cite or link to this item:
http://hdl.handle.net/2248/7309
Title: | On the observational behaviour of the highly polarized Type IIn supernova SN 2017hcc |
Authors: | Brajesh Kumar Eswaraiah, C Singh, A Sahu, D. K Anupama, G. C Kawabata, K. S Yamanaka, Masayuki Otsubo, Ikki Pandey, S. B Nakaoka, Tatsuya Kawabata, Miho Aryan, Amar Akitaya, Hiroshi |
Keywords: | Techniques: photometric Techniques: polarimetric Techniques: spectroscopic Supernovae: general Supernovae: individual SN 2017hcc |
Issue Date: | Sep-2019 |
Publisher: | Oxford University Press on behalf of the Royal Astronomical Society |
Citation: | Monthly Notices of the Royal Astronomical Society, Vol. 488, No. 3, pp. 3089-3099 |
Abstract: | We present the results based on photometric (Swift UVOT), broad-band polarimetric (V and Rbands) 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. |
Description: | Restricted Access © Royal Astronomical Society https://doi.org/10.1093/mnras/stz1914 |
URI: | http://prints.iiap.res.in/handle/2248/7309 |
ISSN: | 1365-2966 |
Appears in Collections: | IIAP Publications |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
On the observational behaviour of the highly polarized Type IIn supernova SN 2017hcc.pdf Restricted Access | 1.13 MB | Adobe PDF | View/Open Request a copy |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.