On the cosmological performance of photometrically classified supernovae with machine learning
| Autor: | Ribamar R. R. Reis, Marcelo Vargas dos Santos, Miguel Quartin |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Physics
Cosmology and Nongalactic Astrophysics (astro-ph.CO) Mean squared error business.industry Decision tree FOS: Physical sciences Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Type (model theory) Machine learning computer.software_genre Photometry (optics) Supernova Space and Planetary Science Feature (computer vision) Observatory Observational cosmology Astrophysics::Solar and Stellar Astrophysics Artificial intelligence Astrophysics - Instrumentation and Methods for Astrophysics business computer Instrumentation and Methods for Astrophysics (astro-ph.IM) Astrophysics - Cosmology and Nongalactic Astrophysics |
| DOI: | 10.48550/arxiv.1908.04210 |
| Popis: | The efficient classification of different types of supernova is one of the most important problems for observational cosmology. However, spectroscopic confirmation of most objects in upcoming photometric surveys, such as the The Rubin Observatory Legacy Survey of Space and Time (LSST), will be unfeasible. The development of automated classification processes based on photometry has thus become crucial. In this paper we investigate the performance of machine learning (ML) classification on the final cosmological constraints using simulated lightcurves from The Supernova Photometric Classification Challenge, released in 2010. We study the use of different feature sets for the lightcurves and many different ML pipelines based on either decision tree ensembles or automated search processes. To construct the final catalogs we propose a threshold selection method, by employing a \emph{Bias-Variance tradeoff}. This is a very robust and efficient way to minimize the Mean Squared Error. With this method we were able to get very strong cosmological constraints, which allowed us to keep $\sim 75\%$ of the total information in the type Ia SNe when using the SALT2 feature set and $\sim 33\%$ for the other cases (based on either the Newling model or on standard wavelet decomposition). Comment: 18 pages, 13 figures, 7 tables. Replaced to match the published version |
| Databáze: | OpenAIRE |
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