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Title: ASASSN-14dq: A fast-declining type II-P Supernova in a low-luminosity host galaxy
Authors: Singh, A
Srivastav, S
Brajesh Kumar
Anupama, G. C
Sahu, D. K
Issue Date: Oct-2018
Publisher: Oxford University Press on behalf of the Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, Vol. 480, No. 2, pp. 2475–2500
Abstract: Optical broadband (UBVRI) photometric and low-resolution spectroscopic observations of the type II-P supernova (SN) ASASSN-14dq are presented. ASASSN-14dq exploded in a low-luminosity/metallicity host galaxy UGC 11860, the signatures of which are present as weak iron lines in the photospheric phase spectra. The SN has a plateau duration of ∼ 90 d, with a plateau decline rate of 1.38 mag (100d)−1 in V-band which is higher than most type II-P SNe. ASASSN-14dq is a luminous type II-P SN with a peak V-band absolute magnitude of –17.7 ± 0.2 mag. The light curve of ASASSN-14dq indicates it to be a fast-declining type II-P SN, making it a transitional event between the type II-P and II-L SNe. The empirical relation linking the steepness parameter and 56Ni mass for type II SNe was rebuilt with the help of well-sampled light curves from the literature. The estimated 56Ni mass of ∼ 0.029 M⊙for ASASSN-14dq is slightly lower than the expected 56Ni mass for a luminous type II-P SN. Using analytical light curve modelling, a progenitor radius of ∼3.6×1013 cm, an ejecta mass of ∼10 M⊙ and a total energy of ∼1.8×1051 erg, was estimated for this event. The photospheric velocity evolution of ASASSN-14dq resembles a type II-P SN, but the Balmer features (Hα and Hβ) show relatively slow velocity evolution. The high-velocity Hα feature in the plateau phase, the asymmetric Hα emission line profile in the nebular phase and the inferred outburst parameters indicate an interaction of the SN ejecta with the circumstellar material (CSM).
Description: Restricted Access
ISSN: 1365-2966
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Appears in Collections:IIAP Publications

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