SIMBAD references

2021MNRAS.503..896D - Mon. Not. R. Astron. Soc., 503, 896-910 (2021/May-1)

SN 2017hpa: a carbon-rich Type Ia supernova.

DUTTA A., SINGH A., ANUPAMA G.C., SAHU D.K. and KUMAR B.

Abstract (from CDS):

We present the optical (UBVRI) and ultraviolet (Swift-Ultraviolet and Optical Telescope) photometry, and optical spectroscopy of Type Ia supernova SN 2017hpa. We study broad-band ultraviolet (UV)+optical light curves and low-resolution spectroscopy spanning from -13.8 to +108 d from the maximum light in B band. The photometric analysis indicates that SN 2017hpa is a normal Type Ia supernova with ΔmB(15) = 0.98 ± 0.16 mag and MB = -19.45 ± 0.15 mag at a distance modulus of µ = 34.08 ± 0.09 mag. The (uvw1 - uvv) colour evolution shows that SN 2017hpa falls in the near-UV (NUV)-blue group. The (B - V) colour at maximum is bluer in comparison to normal Type Ia supernovae. Spectroscopic analysis shows that the Si II λ6355 Å absorption feature evolves rapidly with a velocity gradient, {dot}v=128±7 km s–1 d–1. The pre-maximum phase spectra show prominent C II λ6580 Å absorption feature. The C II 6580 Å line velocity measured from the observed spectra is lower than the velocity of Si II λ6355 Å, which could be due to a line-of-sight effect. The synthetic spectral fits to the pre-maximum spectra using SYN++ indicate the presence of a high-velocity component in the Si II absorption, in addition to a photospheric component. Fitting the observed spectrum with the spectral synthesis code TARDIS, the mass of unburned C in the ejecta is estimated to be ∼0.019 M. The peak bolometric luminosity is L^ bol^_ peak_ = 1.43×1043 erg s–1. The radiation diffusion model fit to the bolometric light curve indicates 0.61 ± 0.02 M of 56Ni is synthesized in the explosion.

Abstract Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): supernovae: individual: SN 2017hpa - galaxies: individual: UGC 3122 - transients: supernovae

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 18

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