Please use this identifier to cite or link to this item:
http://hdl.handle.net/2248/6915
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 |
Keywords: | Supernovae: general Supernovae: individual: ASASSN-14dq Galaxies: individual: UGC 11860 |
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 the 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 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 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 total energy of ∼1.8×1051 erg were estimated for this event. The photospheric velocity evolution of ASASSN-14dq resembles that of a Type II-P SN, but the Balmer features (H α and H β) show relatively slow velocity evolution. The high-velocity H α feature in the plateau phase, the asymmetric H α emission line profile in the nebular phase, and the inferred outburst parameters indicate an interaction of the SN ejecta with the circumstellar material. |
Description: | Restricted Access © Royal Astronomical Society; https://doi.org/10.1093/mnras/sty1957 |
URI: | http://prints.iiap.res.in/handle/2248/6915 |
ISSN: | 1365-2966 |
Appears in Collections: | IIAP Publications |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
ASASSN-14dq a fast-declining Type II-P supernova in a low-luminosity.pdf Restricted Access | 7.77 MB | Adobe PDF | View/Open Request a copy |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.