Euclid: Quick Data Release (Q1) -- Photometric studies of known transients

We report on serendipitous Euclid observations of previously known transients, using the Euclid Q1 data release. By cross-matching with the Transient Name Server (TNS) we identify 164 transients that coincide with the data release. Although the Euclid Q1 release only includes single-epoch data, we are able to make Euclid photometric measurements at the location of 161 of these transients where 67 had a significant flux measurement in at least one band . Euclid obtained deep photometric measurements or upper limits of these transients in the and bands at various phases of the transient light curves, including before, during, and after the observations of ground-based transient surveys. Approximately 70% of known transients reported in the six months before the Euclid observation date and with a discovery magnitude brighter than 24 were detected in Euclid IE images. Our observations include one of the earliest near-infrared detections of a Type Ia supernova (SN 2024pvw) 15 days prior to its peak brightness, and the late-phase (435.9 days post peak) observations of the enigmatic core-collapse SN 2023aew. Euclid deep photometry provides valuable information on the nature of these transients such as their progenitor systems and power with late-time observations being a uniquely powerful contribution . In addition, Euclid is able to detect the host galaxies of some transients that were previously classed as hostless. The Q1 data demonstrate the power of the Euclid data even with only single-epoch observations available, as will be the case for much larger areas of sky in the Euclid Wide Survey.

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Publication Details

Journal
Astronomy and Astrophysics
Published
2025-06-02
DOI
https://doi.org/10.1051/0004-6361/202554600
Primary Topic
Spectroscopy and Laser Applications
Type
article
Field-Weighted Citation Impact
0.00

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article

Euclid: Quick Data Release (Q1) -- Photometric studies of known transients

I. Hook, M. T. Botticella, E. Cappellaro, F. Poidevin et al.
Astronomy and Astrophysics
Spectroscopy and Laser Applications
article

Euclid: Quick Data Release (Q1) -- Photometric studies of known transients

I. Hook, M. T. Botticella, E. Cappellaro, F. Poidevin, Christopher D. P. Duffy
article en

Abstract

We report on serendipitous Euclid observations of previously known transients, using the Euclid Q1 data release. By cross-matching with the Transient Name Server (TNS) we identify 164 transients that coincide with the data release. Although the Euclid Q1 release only includes single-epoch data, we are able to make Euclid photometric measurements at the location of 161 of these transients where 67 had a significant flux measurement in at least one band . Euclid obtained deep photometric measurements or upper limits of these transients in the and bands at various phases of the transient light curves, including before, during, and after the observations of ground-based transient surveys. Approximately 70% of known transients reported in the six months before the Euclid observation date and with a discovery magnitude brighter than 24 were detected in Euclid IE images. Our observations include one of the earliest near-infrared detections of a Type Ia supernova (SN 2024pvw) 15 days prior to its peak brightness, and the late-phase (435.9 days post peak) observations of the enigmatic core-collapse SN 2023aew. Euclid deep photometry provides valuable information on the nature of these transients such as their progenitor systems and power with late-time observations being a uniquely powerful contribution . In addition, Euclid is able to detect the host galaxies of some transients that were previously classed as hostless. The Q1 data demonstrate the power of the Euclid data even with only single-epoch observations available, as will be the case for much larger areas of sky in the Euclid Wide Survey.

Astronomy and Astrophysics
National Science Foundation, U.S. Department of Energy, National Aeronautics and Space Administration, University of Pennsylvania, Ohio State University, California Institute of Technology, University of Chicago, Villum Fonden, University of Portsmouth, Ministerio de Ciencia, Innovación y Universidades, National Energy Research Scientific Computing Center, European Space Agency, Leverhulme Trust, University College London, European Commission, University of Sussex, Deutsche Forschungsgemeinschaft, Swedish National Space Agency, Academy of Finland, Chinese Academy of Sciences, Deutsches Zentrum für Luft- und Raumfahrt, Ministero dell’Istruzione, dell’Università e della Ricerca, Magyar Tudományos Akadémia, Agenzia Spaziale Italiana, Vetenskapsrådet, Financiadora de Estudos e Projetos, Ministerio de Ciencia e Innovación, National Astronomical Observatory of Japan, Agenția Spațială Română, Norsk Romsenter, University of Illinois at Urbana-Champaign, Office of Science, Jet Propulsion Laboratory, Science and Technology Facilities Council, Australian Research Council, Japan Society for the Promotion of Science, Fundação para a Ciência e a Tecnologia, Agència de Gestió d'Ajuts Universitaris i de Recerca, Agencia Estatal de Investigación, Division of Astronomical Sciences, High Energy Physics, Integrated Electronics Engineering Center, Binghamton University, Argonne National Laboratory, Fermilab, Lawrence Berkeley National Laboratory, SLAC National Accelerator Laboratory
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Spectroscopy and Laser Applications
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