Optical and Infrared Spectroscopy of SN 1999ee and SN 1999ex

By M. Hamuy, J. Maza, P. Pinto, M. Phillips, N. Suntzeff, R. Blum, K. Olsen, D. Pinfield, V. Ivanov, T. Augusteijn and 10 more. 2002

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We report optical and infrared spectroscopic observations of the Type Ia SN 1999ee and the Type Ib/c SN 1999ex, both of which were hosted by the galaxy IC 5179. For SN 1999ee we obtained a continuous sequence with an unprecedented wavelength and temporal coverage beginning 9 days before maximum light and extending through day 42. Before maximum light SN 1999ee displayed a normal spectrum with a strong Si II λ6355 absorption, thus showing that not all slow-declining supernovae (SNe) are spectroscopically peculiar at these evolutionary phases. A comparative study of the infrared spectra of SN 1999ee and other Type Ia SNe shows that there is a remarkable homogeneity among the Branch-normal SNe Ia during their first 60 days of evolution. SN 1991bg–like objects, on the other hand, display spectroscopic peculiarities at infrared wavelengths. SN 1999ex was characterized by the lack of hydrogen lines, weak optical He I lines, and strong He I λλ10830, 20581, thus providing an example of an intermediate case between pure Ib and Ic supernovae. We conclude, therefore, that SN 1999ex provides the first clear evidence for a link between the Ib and Ic classes and that there is a continuous spectroscopic sequence ranging from the He-deficient SNe Ic to the SNe Ib, which are characterized by strong optical He I lines.

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Citations in the corpus

• High luminosity, slow ejecta and persistent carbon lines: SN 2009dc challenges thermonuclear explosion scenarios (2010, background): “15 presents a comparison of the NIR spectra of SN 2009dc with those of the well-sampled normal SNe Ia 1999ee (Hamuy et al. 2002) and 2002bo (Benetti et al. 2004).”
• Determining the Type, Redshift, and Age of a Supernova Spectrum (2006, background): “SN Ib versus SN Ic SN Ib and Ic are often difficult to tell apart and are sometimes referred to as “SNe Ib/c” in the literature (e.g., SN 1999ex; Hamuy et al. 2002) and IAU circulars.”
• IMPROVED DISTANCES TO TYPE Ia SUPERNOVAE WITH TWO SPECTROSCOPIC SUBCLASSES (2009, unknown): “…SNe 1989B, 1994D, 1997dt, 1998aq, 1998bu, 1999ee, 2003cg, 2003du, 2004eo, and 2005cf (Barbon et al. 1990; Patat et al. 1996; M08; Branch et al. 2003; Hamuy et al. 2002; Elisa-Rosa et al. 2006; Stanishev et al. 2007; Pastorello et al. 2007; Garavini et al. 2007; Wang et al. 2009). are available.”
• OPTICAL SPECTRA OF 73 STRIPPED-ENVELOPE CORE-COLLAPSE SUPERNOVAE (2014, methodology): “Hamuy et al. (2002) compared SN 1999ex with SN 1984L, 1987M, and 1994I and concluded that it was similar to a SN Ic but with stronger He lines, or a SN Ib with “moderate strength” He i lines, leading them to classify it as “intermediate” SN Ib/c.”
• Supernova 2002bo: inadequacy of the single parameter description (2003, background): “This is confirmed in Figure 13, where we compare the IR spectra of SNe 2002bo at −8.5d, +11.1d and +29.4d with those of SNe 1994D (Meikle et al. 1996)) and 1999ee Hamuy et al. (2002) at similar epochs.”
• THE SPECTROSCOPIC DIVERSITY OF TYPE Ia SUPERNOVAE (2000, background): “…1998a 1998bu Cappellaro et al. 2001a 1999aa Garavini et al. 2004a 1999ac Garavini et al. 2005a, Phillips et al. 2006 1999aw Strolger et al. 2002 1999ee Hamuy et al. 2002a 2000E Valentini et al. 2003a 2000cx Li et al. 2001a 2001ay Krisciunas et al. 2011b 2001el Wang et al. 2003a, Mattila et al.…”
• FROM SHOCK BREAKOUT TO PEAK AND BEYOND: EXTENSIVE PANCHROMATIC OBSERVATIONS OF THE TYPE Ib SUPERNOVA 2008D ASSOCIATED WITH SWIFT X-RAY TRANSIENT 080109 (2008, background): “In addition, comparison of spectra and B − V colors with those of other SNe Ib at comparable epochs, such as SN 1999ex (Stritzinger et al. 2002; Hamuy et al. 2002), yields E(B −V ) = 0.6–0.7 mag.”
• SN 2003du: 480 days in the life of a normal type Ia supernova (2007, methodology): “…SN 1994D (Patat et al., 1996; Filippenko, 1997; Meikle et al., 1996), SN 1990N (Leibundgut et al., 1991), SN 1996X (Salvo et al., 2001), SN 1999ee (Hamuy et al., 2002), SN 1998aq (Branch et al., 2003), SN 1998bu (Jha et al., 1999; Hernandez et al., 2000), SN 2002er (Kotak et al., 2005), SN 2001el…”
• Results from the Supernova Photometric Classification Challenge (2010, background): “…31 http://supernova.lbl.gov/~nugent/nugent templates.html ited amount of spectroscopically confirmed non–Ia data (Levan et al. 2005; Hamuy et al. 2002; Gilliland et al. 1999; Baron et al. 2004; Cappellaro et al. 1997), and therefore the impact of the non–Ia diversity has not…”
• Optical and Infrared Photometry of the Nearby Type Ia Supernova 2001el (2002, methodology): “These corrections were obtained using spectra of SN 1999ee from Hamuy et al. (2002), while some spectra of SN 2001el are discussed by Wang et al. (2002).9 SixHST spectra were also kindly made available to us by P. Nugent (2002, private communication).”
• Improved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples (2014, methodology): “It has been trained on photometric and spectroscopic data from the literature (e.g., Schmidt et al. 1994; Patat et al. 1996; Hamuy et al. 2002; Benetti et al. 2004; Matheson et al. 2008) and high-z supernovae data from the SNLS (Ellis et al. 2008; Balland et al. 2009).”
• SN 2004aw: confirming diversity of Type Ic supernovae (2006, methodology): “Only for two of them are the data public: SN 1999ex (actually an object intermediate between Type Ib and Ic; Hamuy et al. 2002) and the highly energetic BL-SN 1998bw (Patat et al. 2001).”