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Discovery and Follow-up Observations of the Young Type Ia Supernova 2016coj
- Source :
- NASA Astrophysics Data System, Astrophysical Journal, vol 841, iss 1, The Astrophysical Journal, vol 841, iss 1, Zheng, W; Filippenko, AV; Mauerhan, J; Graham, ML; Yuk, H; Hosseinzadeh, G; et al.(2017). Discovery and Follow-up Observations of the Young Type Ia Supernova 2016coj. Astrophysical Journal, 841(1). doi: 10.3847/1538-4357/aa6dfa. UCLA: Retrieved from: http://www.escholarship.org/uc/item/95s4v1hf
- Publication Year :
- 2017
- Publisher :
- American Astronomical Society, 2017.
-
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 $0.6\pm0.5$ 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.<br />Comment: Submitted
- Subjects :
- Brightness
astro-ph.SR
Absorption spectroscopy
astro-ph.GA
FOS: Physical sciences
Astrophysics
Astronomy & Astrophysics
Atomic
01 natural sciences
Spectral line
Ion
Photometry (optics)
Particle and Plasma Physics
individual [supernovae]
0103 physical sciences
Nuclear
Spectroscopy
010303 astronomy & astrophysics
Solar and Stellar Astrophysics (astro-ph.SR)
astro-ph.HE
Physics
High Energy Astrophysical Phenomena (astro-ph.HE)
010308 nuclear & particles physics
Molecular
Astronomy and Astrophysics
Astrophysics - Astrophysics of Galaxies
Redshift
Supernova
Astrophysics - Solar and Stellar Astrophysics
Space and Planetary Science
Astrophysics of Galaxies (astro-ph.GA)
Astrophysics - High Energy Astrophysical Phenomena
general [supernovae]
Astronomical and Space Sciences
Physical Chemistry (incl. Structural)
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- NASA Astrophysics Data System, Astrophysical Journal, vol 841, iss 1, The Astrophysical Journal, vol 841, iss 1, Zheng, W; Filippenko, AV; Mauerhan, J; Graham, ML; Yuk, H; Hosseinzadeh, G; et al.(2017). Discovery and Follow-up Observations of the Young Type Ia Supernova 2016coj. Astrophysical Journal, 841(1). doi: 10.3847/1538-4357/aa6dfa. UCLA: Retrieved from: http://www.escholarship.org/uc/item/95s4v1hf
- Accession number :
- edsair.doi.dedup.....fcbc74dfcd8dadccb1a049e4499e8130