TY - JOUR
T1 - Discovery and Follow-up Observations of the Young Type Ia Supernova 2016coj
AU - Zheng, Weikang
AU - Filippenko, Alexei V.
AU - Mauerhan, Jon
AU - Graham, Melissa L.
AU - Yuk, Heechan
AU - Hosseinzadeh, Griffin
AU - Silverman, Jeffrey M.
AU - Rui, Liming
AU - Arbour, Ron
AU - Foley, Ryan J.
AU - Abolfathi, Bela
AU - Abramson, Louis E.
AU - Arcavi, Iair
AU - Barth, Aaron J.
AU - Bennert, Vardha N.
AU - Brandel, Andrew P.
AU - Cooper, Michael C.
AU - Cosens, Maren
AU - Fillingham, Sean P.
AU - Fulton, Benjamin J.
AU - Halevi, Goni
AU - Howell, D. Andrew
AU - Hsyu, Tiffany
AU - Kelly, Patrick L.
AU - Kumar, Sahana
AU - Li, Linyi
AU - Li, Wenxiong
AU - Malkan, Matthew A.
AU - Manzano-King, Christina
AU - McCully, Curtis
AU - Nugent, Peter E.
AU - Pan, Yen Chen
AU - Pei, Liuyi
AU - Scott, Bryan
AU - Sexton, Remington Oliver
AU - Shivvers, Isaac
AU - Stahl, Benjamin
AU - Treu, Tommaso
AU - Valenti, Stefano
AU - Vogler, H. Alexander
AU - Walsh, Jonelle L.
AU - Wang, Xiaofeng
N1 - Funding Information:
A.V.F.'s group at U.C. Berkeley is grateful for financial assistance from National Science Foundation (NSF) grant AST-1211916, Gary and Cynthia Bengier, the Richard and Rhoda Goldman Fund, the Christopher R. Redlich Fund, and the TABASGO Foundation. J.M.S. is supported by an NSF Astronomy and Astrophysics Postdoctoral Fellowship under award AST-1302771. UC Irvine observing runs were supported in part by NSF grant AST-1412693.
Publisher Copyright:
© 2017. The American Astronomical Society. All rights reserved.
PY - 2017/5/20
Y1 - 2017/5/20
N2 - The Type Ia supernova (SN Ia) 2016coj in NGC 4125 (redshift z = 0.00452 ± 0.00006) 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 (prediscovery) is merely 0.6 ± 0.5 days after the FFLT, making SN 2016coj one of the earliest known detections of an 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 the velocity of Si ii λ6355 around peak brightness (∼12,600 kms-1) is a bit higher than that of typical normal SNe. The Si ii λ6355 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 (MB ≈ -18.9 ± 0.2 mag), and it reaches a B-band maximum ∼16.0 days 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 Si ii line polarization is quite strong (∼0.9% ± 0.1%) at peak brightness.
AB - The Type Ia supernova (SN Ia) 2016coj in NGC 4125 (redshift z = 0.00452 ± 0.00006) 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 (prediscovery) is merely 0.6 ± 0.5 days after the FFLT, making SN 2016coj one of the earliest known detections of an 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 the velocity of Si ii λ6355 around peak brightness (∼12,600 kms-1) is a bit higher than that of typical normal SNe. The Si ii λ6355 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 (MB ≈ -18.9 ± 0.2 mag), and it reaches a B-band maximum ∼16.0 days 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 Si ii line polarization is quite strong (∼0.9% ± 0.1%) at peak brightness.
KW - supernovae: general
KW - supernovae: individual (SN 2016coj)
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U2 - 10.3847/1538-4357/aa6dfa
DO - 10.3847/1538-4357/aa6dfa
M3 - Article
AN - SCOPUS:85019686323
SN - 0004-637X
VL - 841
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1
M1 - 64
ER -