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No evidence of circumstellar gas surrounding Type Ia Supernova SN 2017cbv
Raphael Ferretti, Rahman Amanullah, Mattia Bulla +3
Nearby type Ia supernovae (SNe Ia), such as SN 2017cbv, are useful events to address the question of what the elusive progenitor systems of the explosions are. Hosseinzadeh et al.…
Optical Identification of Cepheids in 19 Host Galaxies of Type Ia Supernovae and NGC 4258 with the Hubble Space Telescope
Samantha L. Hoffmann, Lucas M. Macri, Adam G. Riess +10
We present results of an optical search for Cepheid variable stars using the Hubble Space Telescope (HST) in 19 hosts of Type Ia supernovae (SNe Ia) and the maser-host galaxy NGC 4…
Time-Varying Sodium Absorption in the Type Ia Supernova 2013gh
R. Ferretti, R. Amanullah, A. Goobar +18
Temporal variability of narrow absorption lines in high-resolution spectra of Type Ia supernovae (SNe Ia) is studied to search for circumstellar matter. Time series which resolve t…
An Intermediate Type Ia Supernova Between Normal And Super-Chandrasekhar
Yi Cao, J. Johansson, Peter E. Nugent +14
In this paper, we report observations of a peculiar Type Ia supernova iPTF13asv (a.k.a., SN2013cv) from the onset of the explosion to months after its peak. The early-phase spectra…
Strong Ultraviolet Pulse From a Newborn Type Ia Supernova
Yi Cao, S. R. Kulkarni, D. Andrew Howell +19
Type Ia supernovae are destructive explosions of carbon oxygen white dwarfs. Although they are used empirically to measure cosmological distances, the nature of their progenitors r…
Strong near-infrared carbon in the Type Ia supernova iPTF13ebh
E. Y. Hsiao, C. R. Burns, C. Contreras +51
We present near-infrared (NIR) time-series spectroscopy, as well as complementary ultraviolet (UV), optical, and NIR data, of the Type Ia supernova (SN Ia) iPTF13ebh, which was dis…