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19 April 2024 |
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Photometric and spectroscopic evolution of the peculiar Type IIn SN 2012ab | | Anjasha Gangopadhyay
; Massimo Turatto
; Stefano Benetti
; Kuntal Misra
; Brajesh Kumar
; Enrico Cappellaro
; Andrea Pastorello
; Lina Tomasella
; Sabrina Vanni
; Achille Fiore
; A. Morales-Garoffolo
; Nancy Elias-Rosa
; Mridweeka Singh
; Raya Dastidar
; Paolo Ochner
; Leonardo Tartaglia
; Brijesh Kumar
; Shashi Bhushan Pandey
; | | Date: |
24 Aug 2020 | | Abstract: | We present an extensive ($sim$ 1200 d) photometric and spectroscopic
monitoring of the Type IIn supernova (SN) 2012ab. After a rapid initial rise
leading to a bright maximum (M$_{R}$ = $-$19.39 mag), the light curves show a
plateau lasting about 2 months followed by a steep decline up to about 100 d.
Only in the $U$ band the decline is constant in the same interval. At later
phases, the light curves remain flatter than the $^{56}$Co decline suggesting
the increasing contribution of the interaction between SN ejecta with
circumstellar material (CSM). Although heavily contaminated by emission lines
of the host galaxy, the early spectral sequence (until 32 d) shows persistent
narrow emissions, indicative of slow unshocked CSM, and the emergence of broad
Balmer lines of hydrogen with P-Cygni profiles over a blue continuum, arising
from a fast expanding SN ejecta. From about 2 months to $sim$1200 d, the
P-Cygni profiles are overcome by intermediate width emissions (FWHM $sim 6000$
kms), produced in the shocked region due to interaction. On the red wing a red
bump appears after 76 d, likely a signature of the onset of interaction of the
receding ejecta with the CSM. The presence of fast material both approaching
and then receding is suggestive that we are observing the SN along the axis of
a jet-like ejection in a cavity devoid of or uninterrupted by CSM in the
innermost regions. | | Source: | arXiv, 2008.10482 | | Services: | Forum | Review | PDF | Favorites | |
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