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arXiv · 1911.07734

SN 2017cfd: A Normal Type Ia Supernova Discovered Very Young

Xuhui Han·WeiKang Zheng·Benjamin E. Stahl·Jamison Burke·Jozsef Vinko·Thomas de Jaeger·Thomas G. Brink·Borbala Cseh·Daichi Hiramatsu·D. Andrew Howell·Bernadett Ignacz·Reka Konyves-Toth·Mate Krezinger·Curtis McCully·Andras Ordasi·Dora Pinter·Krisztian Sarneczky·Robert Szakats·Kevin Tang·Krisztian Vida·Jing Wang·Jianyan Wei·J. Craig Wheeler·Liping Xin·Alexei V. Filippenko
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Abstract

The Type~Ia supernova (SN~Ia) 2017cfd in IC~0511 (redshift z = 0.01209+- 0.00016$) was discovered by the Lick Observatory Supernova Search 1.6+-0.7 d after the fitted first-light time (FFLT; 15.2 d before B-band maximum brightness). Photometric and spectroscopic follow-up observations show that SN~2017cfd is a typical, normal SN~Ia with a peak luminosity MB ~ -19.2+-0.2 mag, Delta m15(B) = 1.16 mag, and reached a B-band maximum ~16.8 d after the FFLT. We estimate there to be moderately strong host-galaxy extinction (A_V = 0.39 +- 0.03 mag) based on MLCS2k2 fitting. The spectrum reveals a Si~II lambda 6355 velocity of ~11,200 kms at peak brightness. The analysis shows that SN~2017cfd is a very typical, normal SN Ia in nearly every aspect. SN~2017cfd was discovered very young, with multiband data taken starting 2 d after the FFLT, making it a valuable complement to the currently small sample (fewer than a dozen) of SNe~Ia with color data at such early times. We find that its intrinsic early-time (B - V)0 color evolution belongs to the "blue" population rather than to the distinct "red" population. Using the photometry, we constrain the companion star radius to be < 2.5 R_sun, thus ruling out a red-giant companion.

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Xuhui Han, WeiKang Zheng, Benjamin E. Stahl, Jamison Burke, Jozsef Vinko, Thomas de Jaeger, Thomas G. Brink, Borbala Cseh, Daichi Hiramatsu, D. Andrew Howell, Bernadett Ignacz, Reka Konyves-Toth, Mate Krezinger, Curtis McCully, Andras Ordasi, Dora Pinter, Krisztian Sarneczky, Robert Szakats, Kevin Tang, Krisztian Vida, Jing Wang, Jianyan Wei, J. Craig Wheeler, Liping Xin, Alexei V. Filippenko. 2019-11-18. SN 2017cfd: A Normal Type Ia Supernova Discovered Very Young. https://doi.org/10.3847/1538-4357%2Fab7a27

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