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Date and Time of the Query: 2018-07-21 T06:20:19 PDT
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For refcode 2014AJ....147...37V:
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2014AJ....147...37V The Type IIb Supernova 2013df and its Cool Supergiant Progenitor Van Dyk, Schuyler D.; Zheng, WeiKang; Fox, Ori D.; Cenko, S. Bradley; Clubb, Kelsey I.; Filippenko, Alexei V.; Foley, Ryan J.; Miller, Adam A.; Smith, Nathan; Kelly, Patrick L.; Lee, William H.; Ben-Ami, Sagi; Gal-Yam, Avishay Abstract. We have obtained early-time photometry and spectroscopy of supernova (SN) 2013df in NGC 4414. The SN is clearly of Type IIb, with notable similarities to SN 1993J. From its luminosity at secondary maximum light, it appears that less ^56^Ni (lsim 0.06 M_sun_) was synthesized in the SN 2013df explosion than was the case for the SNe IIb 1993J, 2008ax, and 2011dh. Based on a comparison of the light curves, the SN 2013df progenitor must have been more extended in radius prior to explosion than the progenitor of SN 1993J. The total extinction for SN 2013df is estimated to be A_V_ = 0.30 mag. The metallicity at the SN location is likely to be solar. We have conducted Hubble Space Telescope (HST) Target of Opportunity observations of the SN with the Wide Field Camera 3, and from a precise comparison of these new observations to archival HST observations of the host galaxy obtained 14 yr prior to explosion, we have identified the progenitor of SN 2013df to be a yellow supergiant, somewhat hotter than a red supergiant progenitor for a normal Type II-Plateau SN. From its observed spectral energy distribution, assuming that the light is dominated by one star, the progenitor had effective temperature T_eff_ = 4250 +/- 100 K and a bolometric luminosity L_bol_ = 10^4.94 +/- 0.06^ L_sun_. This leads to an effective radius R_eff_ = 545 +/- 65 R_sun_. The star likely had an initial mass in the range of 13-17 M_sun_ however, if it was a member of an interacting binary system, detailed modeling of the system is required to estimate this mass more accurately. The progenitor star of SN 2013df appears to have been relatively similar to the progenitor of SN 1993J. Key words: galaxies: individual: NGC 4414, stars: evolution, supernovae: general, supernovae: individual: SN 2013df
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