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, Nikki Arendse Oskar Klein Centre, Department of Physics, Stockholm University , SE-106 91 Stockholm, Sweden E-mail: nikki.arendse@fysik.su.se Search for other works by this author on: Oxford Academic Suhail Dhawan Institute of Astronomy and Kavli Institute for Cosmology, University of Cambridge , Madingley Road, Cambridge CB3 0HA, Search for other works by this author on: Oxford Academic Ana Sagués Carracedo Oskar Klein Centre, Department of Physics, Stockholm University , SE-106 91 Stockholm, Sweden Search for other works by this author on: Oxford Academic Hiranya V Peiris Oskar Klein Centre, Department of Physics, Stockholm University , SE-106 91 Stockholm, Sweden Institute of Astronomy and Kavli Institute for Cosmology, University of Cambridge , Madingley Road, Cambridge CB3 0HA, UK Search for other works by this author on: Oxford Academic Ariel Goobar Oskar Klein Centre, Department of Physics, Stockholm University , SE-106 91 Stockholm, Sweden Search for other works by this author on: Oxford Academic Radek Wojtak DARK, Niels Bohr Institute, University of Copenhagen , Jagtvej 128, 2200 Copenhagen, Denmark Search for other works by this author on: Oxford Academic Catarina Alves Department of Physics & Astronomy, University College London , Gower Street, London WC1E 6BT, UK Search for other works by this author on: Oxford Academic Rahul Biswas Oskar Klein Centre, Department of Physics, Stockholm University , SE-106 91 Stockholm, Sweden Search for other works by this author on: Oxford Academic Simon Huber Max-Planck-Institut für Astrophysik , Karl-Schwarzschild Str. 1, 85741 Garching, Germany Technische Universität München, Physik-Department , James-Franck-Straße 1, 85748 Garching, Germany Search for other works by this author on: Oxford Academic Simon Birrer Department of Physics and Astronomy, Stony Brook University , Stony Brook, NY 11794, USA Search for other works by this author on: Oxford Academic
Monthly Notices of the Royal Astronomical Society, stae1356, https://doi.org/10.1093/mnras/stae1356
Published:
30 May 2024
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Nikki Arendse, Suhail Dhawan, Ana Sagués Carracedo, Hiranya V Peiris, Ariel Goobar, Radek Wojtak, Catarina Alves, Rahul Biswas, Simon Huber, Simon Birrer, The LSST Dark Energy Science Collaboration, Detecting strongly-lensed type Ia supernovae with LSST, Monthly Notices of the Royal Astronomical Society, 2024;, stae1356, https://doi.org/10.1093/mnras/stae1356
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Abstract
Strongly-lensed supernovae are rare and valuable probes of cosmology and astrophysics. Upcoming wide-field time-domain surveys, such as the Vera C. Rubin Observatory’s Legacy Survey of Space and Time (LSST), are expected to discover an order-of-magnitude more lensed supernovae than have previously been observed. In this work, we investigate the cosmological prospects of lensed type Ia supernovae (SNIa) in LSST by quantifying the expected annual number of detections, the impact of stellar microlensing, follow-up feasibility, and how to best separate lensed and unlensed SNIa. We simulate SNIa lensed by galaxies, using the current LSST baseline v3.0 cadence, and find an expected number of 44 lensed SNIa detections per year. Microlensing effects by stars in the lensing galaxy are predicted to lower the lensed SNIa detections by |$\sim 8~{{\%}}$|. The lensed events can be separated from the unlensed ones by jointly considering their colours and peak magnitudes. We define a ‘gold sample’ of ∼10 lensed SNIa per year with time delay >10days, >5 detections before light-curve peak, and sufficiently bright (mi < 22.5 mag) for follow-up observations. In three years of LSST operations, such a sample is expected to yield a 1.5% measurement of the Hubble constant.
gravitational lensing: strong, supernovae: general, methods: statistical
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© The Author(s) 2024. Published by Oxford University Press on behalf of Royal Astronomical Society.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
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