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Rise and fall of the dust shell of the classical nova V339 Delphini
A. Evans, D. P. K. Banerjee, R. D. Gehrz +16
We present infrared spectroscopy of the classical nova V339 Delphini, obtained over a year period. The infrared emission lines were initially symmetrical, with HWHM velocit…
After the Fall: Late-Time Spectroscopy of Type IIP Supernovae
Jeffrey M. Silverman, Stephanie Pickett, J. Craig Wheeler +11
Herein we analyse late-time (post-plateau; 103 < t < 1229 d) optical spectra of low-redshift (z < 0.016), hydrogen-rich Type IIP supernovae (SNe IIP). Our newly constructed sample…
Type Ibn Supernovae Show Photometric Homogeneity and Spectral Diversity at Maximum Light
Griffin Hosseinzadeh, Iair Arcavi, Stefano Valenti +34
Type Ibn supernovae (SNe) are a small yet intriguing class of explosions whose spectra are characterized by low-velocity helium emission lines with little to no evidence for hydrog…
The Continuing Story of SN IIb 2013df: New Optical and IR Observations and Analysis
Tamás Szalai, József Vinkó, Andrea P. Nagy +17
SN 2013df is a nearby Type IIb supernova that seems to be the spectroscopic twin of the well-known SN 1993J. Previous studies revealed many, but not all interesting properties of t…
Ultraviolet Diversity of Type Ia Supernovae
Ryan J. Foley, Yen-Chen Pan, P. Brown +9
Ultraviolet (UV) observations of Type Ia supernovae (SNe Ia) probe the outermost layers of the explosion, and UV spectra of SNe Ia are expected to be extremely sensitive to differe…
Post-maximum near infrared spectra of SN 2014J: A search for interaction signatures
D. J. Sand, E. Y. Hsiao, D. P. K. Banerjee +7
We present near infrared (NIR) spectroscopic and photometric observations of the nearby Type Ia SN 2014J. The seventeen NIR spectra span epochs from +15.3 to +92.5 days after -b…