Comparisons of Type Ia Supernova Light Curves in the UV and Optical with the Swift Ultra-Violet/Optical Telescope

Abstract

We examine the light curve parameters of 97 nearby Type Ia supernovae in the ultraviolet and optical using observations from the Swift Ultra-Violet/Optical Telescope. Our light curve models used a linear combinations of templates, which were based on Functional Principal Component Analysis of the optical photometry of SNe Ia. The weights for each principal component used in the fit capture certain aspects of the light curve properties. We find that there is little difference in the overall variability of principal component scores across filters. We also find correlations between certain filters and PC components, indicating that the UV and optical properties seem to be tied together. This is a promising step in UV SNe Ia analysis, and suggests that UV light curves may be used to infer optical properties, paving the way for future cosmological studies.

16 pages, 11 figures. Accepted for publication in AJ

References in corpus (10)

• Array Programming with NumPy
• Some Aspects of Measurement Error in Linear Regression of Astronomical Data
• Improved Distances to Type Ia Supernovae with Multicolor Light Curve Shapes: MLCS2k2
• A Common Explosion Mechanism for Type Ia Supernovae
• On the Origin of the Type Ia Supernova Width-Luminosity Relation
• Type Ia Supernovae are Good Standard Candles in the Near Infrared: Evidence from PAIRITEL
• SALT3: An Improved Type Ia Supernova Model for Measuring Cosmic Distances
• Ultraviolet Observations of Super-Chandrasekhar Mass Type Ia Supernova Candidates with Swift UVOT
• Early ultraviolet emission in the Type Ia supernova LSQ12gdj: No evidence for ongoing shock interaction
• Reddened, Redshifted, or Intrinsically Red? Understanding Near-Ultraviolet Colors of Type Ia Supernovae