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Discovery and Follow-up Observations of the Young Type Ia Supernova 2016coj | | WeiKang Zheng
; Alexei V. Filippenko
; Jon Mauerhan
; Melissa L. Graham
; Heechan Yuk
; Griffin Hosseinzadeh
; Jeffrey M. Silverman
; Liming Rui
; Ron Arbour
; Ryan J. Foley
; Bela Abolfathi
; Louis E. Abramson
; Iair Arcavi
; Aaron J. Barth
; Vardha N. Bennert
; Andrew P. Brandel
; Michael C. Cooper
; Maren Cosens
; Sean P. Fillingham
; Benjamin J. Fulton
; Goni Halevi
; D. Andrew Howell
; Tiffany Hsyu
; Patrick L. Kelly
; Sahana Kumar
; Linyi Li
; Wenxiong Li
; Matthew A. Malkan
; Christina Manzano-King
; Curtis McCully
; Peter E. Nugent
; Yen-Chen Pan
; Liuyi Pei
; Bryan Scott
; Remington Oliver Sexton
; Isaac Shivvers
; Benjamin Stahl
; Tommaso Treu
; Stefano Valenti
; H. Alexander Vogler
; Jonelle L. Walsh
; Xiaofeng Wang
; | | Date: |
29 Nov 2016 | | Abstract: | The Type~Ia supernova (SN~Ia) 2016coj in NGC 4125 (redshift $z=0.004523$) was
discovered by the Lick Observatory Supernova Search 4.9 days after the fitted
first-light time (FFLT; 11.1 days before $B$-band maximum). Our first detection
(pre-discovery) is merely $0.6pm0.5$ day after the FFLT, making SN 2016coj one
of the earliest known detections of a SN Ia. A spectrum was taken only 3.7 hr
after discovery (5.0 days after the FFLT) and classified as a normal SN Ia. We
performed high-quality photometry, low- and high-resolution spectroscopy, and
spectropolarimetry, finding that SN 2016coj is a spectroscopically normal SN
Ia, but with a high velocity of ion{Si}{2} $lambda$6355 ($sim 12,600$,kms
around peak brightness). The ion{Si}{2} $lambda$6355 velocity evolution can
be well fit by a broken-power-law function for up to a month after the FFLT. SN
2016coj has a normal peak luminosity ($M_B approx -18.9 pm 0.2$ mag), and it
reaches a $B$-band maximum about16.0~d after the FFLT. We estimate there to be
low host-galaxy extinction based on the absence of Na~I~D absorption lines in
our low- and high-resolution spectra. The spectropolarimetric data exhibit weak
polarization in the continuum, but the ion{Si}{2} line polarization is quite
strong ($sim 0.9\% pm 0.1\%$) at peak brightness. | | Source: | arXiv, 1611.9438 | | Services: | Forum | Review | PDF | Favorites | |
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