Towards Precision Photometric Type Ia Supernova Cosmology with Machine Learning
arxiv(2024)
Abstract
The revolutionary discovery of dark energy and accelerating cosmic expansion
was made with just 42 type Ia supernovae (SNe Ia) in 1999. Since then, large
synoptic surveys, e.g., Dark Energy Survey (DES), have observed thousands more
SNe Ia and the upcoming Rubin Legacy Survey of Space and Time (LSST) and Roman
Space Telescope promise to deliver millions in the next decade. This
unprecedented data volume can be used to test concordance cosmology. However,
extracting a pure SN Ia sample with accurate redshifts for such a large dataset
will be a challenge. Spectroscopic classification will not be possible for the
vast majority of discovered objects, and only 25
redshifts. This thesis presents a series of observational and methodological
studies designed to address the questions associated with this new era of
photometric SN Ia cosmology. First, we present a machine learning (ML) method
for SN photometric classification, SCONE. Photometric classification enables
SNe with no spectroscopic information to be categorized, a critical step for
cosmological analysis. SCONE achieves 99+
SNe Ia from non-Ia SNe, and is a part of DES, LSST, and Roman analysis
pipelines. We also show that SCONE can classify 6 SN types with 75
the night of initial discovery, comparable to results in the literature for
full-phase SNe. Next, we study current methods for estimating SN Ia redshifts
and propose an ML alternative that uses SN photometry alone to extract redshift
information. Photo-zSNthesis is a host galaxy-independent redshift estimator
accurate to within 2
literature. Finally, we focus on ML robustness and demonstrate a general method
for improving robustness that achieves new state-of-the-art results on
astronomical object classification, wildlife identification, and tumor
detection.
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