Abstract Details
| Name: Avinash Singh Affiliation: IIA, Bengaluru Conference ID: ASI2019_487 Title : SN 2016gfy: A slow-declining, luminous type II-P SN Authors and Co-Authors : Brajesh Kumar, D.K. Sahu, G.C. Anupama Abstract Type : Oral Abstract Category : Extragalactic Astronomy Abstract : We present the optical broadband photometric and low-resolution spectroscopic observations of the type II-P supernova 2016gfy observed from the 2-m Himalayan Chandra Telescope situated in Hanle. Template subtraction was performed on the object images to eliminate the contamination from the nearby HII region as the SN exploded in the spiral arm of a face-on spiral galaxy NGC 2276. Preliminary results indicate a slow-declining (s2 ~ 0.1 mag/100 d) and luminous (Mv ~ -17.6 mag) type II-P SN with clear signatures of hydrogen in the spectra. We obtain a nickel mass of 0.044 solar mass, which is consistent with its mid-plateau luminosity. A bump is seen in the apparent magnitude VRI light curves of SN 2016gfy post the mid-plateau phase which is typically seen only in the I-band in most other Type II-P. Even with the peculiar bump around 80 d, the photospheric velocity evolution and the colour evolution of SN 2016gfy do not show any considerable peculiarity when compared with other Type II-P SNe. In addition, we observe Ca II NIR triplet in the photospheric phase and the beginning of the nebular phase similar to other type II-P SNe, however, Ca II triplet disappears in the late-nebular phase (~200 d). SN 2016gfy adds to the peculiarities seen in the class of Type II-P SN. |