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

TL;DR
This paper reports the discovery of SN 2016coj, a normal Type Ia supernova detected very early, with detailed spectroscopic and polarimetric observations revealing high velocity features and low host-galaxy extinction.
Contribution
It provides one of the earliest detections of a SN Ia and offers comprehensive spectroscopic and polarimetric data, enhancing understanding of early supernova evolution.
Findings
SN 2016coj is a spectroscopically normal SN Ia with high Si II velocity (~12,600 km/s).
The Si II velocity evolution fits a broken-power-law for up to a month post-FFLT.
SN 2016coj has a normal peak luminosity (M_B ≈ -18.9 mag) and low host-galaxy extinction.
Abstract
The Type~Ia supernova (SN~Ia) 2016coj in NGC 4125 (redshift ) was discovered by the Lick Observatory Supernova Search 4.9 days after the fitted first-light time (FFLT; 11.1 days before -band maximum). Our first detection (pre-discovery) is merely 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} 6355 (\,\kms\ around peak brightness). The \ion{Si}{2} 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…
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