Abstract Details

Name: ANIRBAN DUTTA
Affiliation: Indian Institute of Astrophysics
Conference ID: ASI2020_355
Title : Observation of Carbon-rich Supernova SN 2017hpa
Authors and Co-Authors : Anirban Dutta, Avinash Singh, G.C.Anupama, D.K.Sahu, Brajesh Kumar
Abstract Type : Oral
Abstract Category : Extragalactic Astronomy
Abstract : We present optical broadband photometry and low resolution spectroscopy of Type-Ia Supernova(SN) 2017hpa which exploded near the spiral arms of the galaxy UGC 03122 observed through the 2.0 m Himalayan Chandra Telescope. We also show UVOT observation of SN 2017hpa from Neil Gehrels Swift observatory. The early phase spectra of SN 2017hpa shows Carbon feature, which could be due the merger of two white dwarf stars( a double degenerate (DD) scenario). DD scenario can possibly have masses and luminosities that extend beyond the Chandrasekhar limit. The peak quasi-bolometric luminosity of SN 2017hpa is around 1.24 x 10^43 erg/sec obtained by integrating the fluxes of UBVRI bands after correcting for Galactic reddening with R_V = 3.1. Initial estimate of peak absolute B-band magnitude is M(B) = -19.4 +/- 0.03. SN 2017hpa has been compared with other Carbon-rich supernovae(SNe) SN 1990N, SN 2006gz, SN 2003fg to understand the progenitor properties. Further analysis of colour evolution, Si II and C II velocity evolution, width-luminosity relation can put constraint on the mechanism of explosion. References: 1. THE LUMINOUS AND CARBON-RICH SUPERNOVA 2006gz: A DOUBLE DEGENERATE MERGER?, Hicken, M. et al., 2007, Bulletin of the American Astronomical Society, Vol. 39, p.929 2. OPTICAL LIGHT CURVES OF THE TYPE Ia SUPERNOVAE SN 1990N AND SN 1991T, Lira, P. et al., 1998, The Astronomical Journal, Volume 115, Issue 1, pp. 234-246 3. On SN 2003fg: The Probable Super-Chandrasekhar-Mass SN Ia, Jeffery, D.J. et al., 2006 4. Optical Spectra of Supernovae, Branch, D. et al., 2003, Lecture Notes in Physics, vol. 598, p.47-75