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

The Type Ia supernova (SN Ia) 2017cfd in IC 0511 (redshift ) was discovered by the Lick Observatory Supernova Search 1.6 0.7 day after the fitted first-light time (15.2 days before B-band maximum brightness). Photometric and spectroscopic follow-up observations show that SN 2017cfd is a typical, nor...

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Bibliographic Details
Published in:The Astrophysical journal 2020-04, Vol.892 (2), p.142
Main Authors: Han, Xuhui, Zheng, WeiKang, Stahl, Benjamin E., Burke, Jamison, Vinko, Jozsef, Jaeger, Thomas de, Arcavi, Iair, Brink, Thomas G., Cseh, Borbala, Hiramatsu, Daichi, Hosseinzadeh, Griffin, Howell, D. Andrew, Ignacz, Bernadett, Konyves-Toth, Reka, Krezinger, Mate, McCully, Curtis, Ordasi, Andras, Pinter, Dora, Sarneczky, Krisztian, Szakats, Robert, Tang, Kevin, Vida, Krisztian, Wang, Jing, Wei, Jianyan, Wheeler, J. Craig, Xin, Liping, Filippenko, Alexei V.
Format: Article
Language:English
Subjects:
Astrophysics
Brightness
Color
Galaxies
Luminosity
Photometry
Red shift
Supernova
Supernovae
Type Ia supernovae
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Summary:The Type Ia supernova (SN Ia) 2017cfd in IC 0511 (redshift ) was discovered by the Lick Observatory Supernova Search 1.6 0.7 day after the fitted first-light time (15.2 days 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 mag, Δm15(B) = 1.16 mag, and reached a B-band maximum ∼16.8 days after the first light. We estimate there to be moderately strong host-galaxy extinction (AV = 0.39 0.03 mag) based on MLCS2k2 fitting. The spectrum reveals a Si ii λ6355 velocity of ∼11,200 km s−1 at peak brightness. SN 2017cfd was discovered very young, with multiband data taken starting 2 days after the first light, 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 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☉ with the Kasen model, thus ruling out a red-giant companion.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ab7a27