NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-18 T15:06:42 PDT
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For refcode 2010PASP..122....1Z:
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Copyright by Astronomical Society of the Pacific. Reproduced by permission
2010PASP..122....1Z Optical Observations of the Rapidly Expanding Type Ia Supernova 2007gi Zhang, T.; Wang, X.; Li, W.; Filippenko, A. V.; Wang, L.; Zhou, X.; Brown, P. J.; Silverman, J. M.; Steele, T. N.; Ganeshalingam, M.; Li, J.; Deng, J.; Li, T.; Qiu, Y.; Zhai, M.; Shang, R. Abstract. We present optical photometry and spectra for the Type Ia supernova (SN Ia) 2007gi in the nearby galaxy NGC 4036. SN 2007gi is characterized by extremely high-velocity (HV) features of the intermediate-mass elements (Si, Ca, and S), with expansion velocities (v_exp_) approaching ~15,000 km s^-1 near-maximum brightness (compared to ~10,000 km s^-1 for SNe Ia with normal v_exp_). SN 2007gi reached a B-band peak magnitude of 13.25+-0.04 with a decline rate of{DELTA}m_15_(B)(true) = 1.33+-0.09 mag. The -band light curve of SN 2007gi demonstrated an interesting two-stage evolution during the nebular phase, with a decay rate of 1.16+-0.05 mag (100 days)^-1^ during t = 60-90 days and 1.61+-0.04 mag (100 days)^-1^ thereafter. Such behavior was also observed in the HV SN Ia 2006X, and might be caused by the interaction between supernova ejecta and circumstellar material (CSM) around HV SNe Ia. Based on a sample of a dozen well-observed band (or unfiltered) light curves of SNe Ia, we confirm that the HV events may have a faster rise time to maximum than those with normal v_exp_. Key words: Supernovae
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