Abstract Details

Name: Anirban Dutta
Affiliation: Indian Institute of Astrophysics
Conference ID: ASI2021_430
Title : Observational Study of nearby type Ia Supernova 2019np for over 400 days
Authors and Co-Authors : Anirban Dutta , D.K. Sahu, G.C. Anupama (Indian Institute of Astrophysics, Bangalore), Harsh Kumar (IIT, Bombay), Avinash Singh, Brajesh Kumar (ARIES, Nainital), Rishabh Singh Teja, Sudhanshu Barway (IIA, Bangalore) and Varun Bhalerao (IIT, Bombay)
Abstract Type : Poster
Abstract Category : Extragalactic Astronomy
Abstract : We present optical/UV broadband photometry and low resolution spectroscopy of nearby type Ia Supernova (SN) 2019np. The SN exploded near the spiral arms of the galaxy NGC 3254 and has been observed through the 2.0 m Himalayan Chandra Telescope, 0.7 m Growth-India Telescope, 3.6 m Devasthal Optical Telescope for over 400 days since maximum light in B-band. The SN has also been extensively monitored in near UV by the Neil Gehrels Swift Observatory. The decline rate in B-band is 0.89 +/- 0.03 mag with a peak absolute magnitude of -19.26 +/- 0.1 mag. By fitting the observed light curve with standard fitting methods such as MLCS2k2 and SALT2 we estimate the distance modulus of the SN to be 32.60 +/- 0.04 mag. One dimensional radiation diffusion model fit to the quasi-bolometric light curve indicates 0.41 M​ ☉​ of 56-Nickel has been synthesized in the explosion. The early phase spectra shows traces of unburned material in the form of C and also prominent absorption lines due to intermediate mass elements. The velocity evolution calculated from the Si II absorption minimum which acts a good tracer of the photospheric velocity is 50 km/s/day which places SN 2019np among the low velocity gradient objects. We also fit the early and near maximum light spectra of SN 2019np with one-dimensional spectral synthesis code ​ TARDIS to understand the explosion channel and put constraints on the ejected mass of different elements above the photosphere.