Supernova Ia Spectra and Spectrophotometric Time Series: Recognizing Twins and the Consequences for Cosmological Distance Measurements
Year: 2013
Type: dissertation
Abstract: In Part I we introduce the method and results of the Twin Supernova analysis.This novel approach to Type Ia supernova standardization is currently only possible with spectrophotometric timeseries observations from the Nearby Supernova Factory. As Chapters1 through 4 will explore, we select an ideal subset of supernovae, find pairs whose featuresmatch well in flux at all wavelengths and times, and test their dispersion in brightness.The analysis is completed in a blinded fashion, ensuring that we are not tuning our results.What we find is that twin supernovae do indeed have a small brightness dispersion.Part II shows two additional analyses related to the standardization of Type Ia supernovae.In Chapter 5 we present a check on the results of Bailey et al. [2009]. Literature supernovaewith spectra near maximum light were tested to see how well their magnitudes could be standardizedusing the flux ratio method of Bailey et al [2009].Chapter 6 shows a study with data from the Nearby Supernova Factory. Using only thespectrophotometric observations near maximum light, we calculate monochromatic Hubble Diagramresiduals for each supernova. Those residuals are then corrected using a flux ratio, similarto Bailey et al. [2009] to test the standardization possibilities using only near-maximum observations.
Author: H. K. Fakhouri
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2202014176