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SNGuess: A method for the selection of young extragalactic transients

Miranda, N. and Freytag, J. C. and Nordin, J. and Biswas, R. and Brinnel, V. and Fremling, C. and Kowalski, M. and Mahabal, A. and Reusch, S. and van Santen, J. (2022) SNGuess: A method for the selection of young extragalactic transients. Astronomy and Astrophysics, 665 . Art. No. A99. ISSN 0004-6361. doi:10.1051/0004-6361/202243668.

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Context. With a rapidly rising number of transients detected in astronomy, classification methods based on machine learning are increasingly being employed. Their goals are typically to obtain a definitive classification of transients, and for good performance they usually require the presence of a large set of observations. However, well-designed, targeted models can reach their classification goals with fewer computing resources. Aims. The aim of this study is to assist in the observational astronomy task of deciding whether a newly detected transient warrants follow-up observations. Methods. This paper presents SNGuess, a model designed to find young extragalactic nearby transients with high purity. SNGuess works with a set of features that can be efficiently calculated from astronomical alert data. Some of these features are static and associated with the alert metadata, while others must be calculated from the photometric observations contained in the alert. Most of the features are simple enough to be obtained or to be calculated already at the early stages in the lifetime of a transient after its detection. We calculate these features for a set of labeled public alert data obtained over a time span of 15 months from the Zwicky Transient Facility (ZTF). The core model of SNGuess consists of an ensemble of decision trees, which are trained via gradient boosting. Results. Approximately 88% of the candidates suggested by SNGuess from a set of alerts from ZTF spanning from April 2020 to August 2021 were found to be true relevant supernovae (SNe). For alerts with bright detections, this number ranges between 92% and 98%. Since April 2020, transients identified by SNGuess as potential young SNe in the ZTF alert stream are being published to the Transient Name Server (TNS) under the AMPEL_ZTF_NEW group identifier. SNGuess scores for any transient observed by ZTF can be accessed via a web service The source code of SNGuess is publicly available Conclusions. SNGuess is a lightweight, portable, and easily re-trainable model that can effectively suggest transients for follow-up. These properties make it a useful tool for optimizing follow-up observation strategies and for assisting humans in the process of selecting candidate transients.

Item Type:Article
Related URLs:
URLURL TypeDescription
Miranda, N.0000-0001-6070-7540
Freytag, J. C.0000-0002-5089-6875
Biswas, R.0000-0002-5741-7195
Fremling, C.0000-0002-4223-103X
Mahabal, A.0000-0003-2242-0244
Reusch, S.0000-0002-7788-628X
van Santen, J.0000-0002-2412-9728
Additional Information:We acknowledge the efforts of the BTS survey of the California Institute of Technology (Fremling et al. 2020; Perley et al. 2020), and of individual astronomers of the Humboldt-Universität zu Berlin in assigning types to transient candidates. Their results were instrumental to our supervised machine learning procedure. N. Miranda acknowledges the support of the Helmholtz Einstein International Berlin Research School in Data Science (HEIBRiDS).
Funding AgencyGrant Number
Helmholtz Einstein International Berlin Research School in Data Science (HEIBRiDS)UNSPECIFIED
Record Number:CaltechAUTHORS:20220928-285212100.7
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:117164
Deposited By: Melissa Ray
Deposited On:04 Oct 2022 02:34
Last Modified:04 Oct 2022 02:35

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