Work

AI-driven spatio-temporal engine for finding gravitationally lensed type Ia supernovae

Year: 2022

Type: article

Abstract: ABSTRACT We present a spatio-temporal AI framework that concurrently exploits both the spatial and time-variable features of gravitationally lensed supernovae in optical images to ultimately aid in future discoveries of such exotic transients in wide-field surveys. Our spatio-temporal engine is designed using recurrent convolutional layers, while drawing from recent advances in variational inference to quantify approximate Bayesian uncertainties via a confidence score. Using simulated Young Supernova Experiment (YSE) images of lensed and non-lensed supernovae as a showcase, we find that the use of time-series images adds relevant information from time variability of spatial light distribution of partially blended images of lensed supernova, yielding a substantial gain of around 20 per cent in classification accuracy over single-epoch observations. Preliminary application of our network to mock observations from the Legacy Survey of Space and Time (LSST) results in detections with accuracy reaching around 99 per cent. Our innovative deep learning machinery is versatile and can be employed to search for any class of sources that exhibit variability both in flux and spatial distribution of light.

Source: Monthly Notices of the Royal Astronomical Society

DOI: 10.1093/mnras/stac838

Authors: Doogesh Kodi Ramanah, Nikki Arendse, Radosław Wojtak

Institutions: University of Copenhagen, Stockholm University

Language: English

Topic: Gamma-ray bursts and supernovae

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: Villum Fonden, Carlsbergfondet

Award: G290545188