Preprint

Unveiling photometric transients with the ILMT and their follow-up using DOT

Priyanshi KumariAryabhatta Research Institute of Observational Sciences (ARIES) , Manora Peak , Nainital - 263002 , IndiaBhavya AilawadhiAryabhatta Research Institute of Observational Sciences (ARIES) , Manora Peak , Nainital - 263002 , IndiaTalat AkhunovNational University of Uzbekistan , Department of Astronomy and Astrophysics , 100174 Tashkent , UzbekistanMonalisa DubeyMahatma Jyotiba Phule Rohilkhand University , Pilibhit Bypass Road , Bareilly 243006 , Uttar Pradesh , IndiaNaveen DukiyaAryabhatta Research Institute of Observational Sciences (ARIES) , Manora Peak , Nainital - 263002 , IndiaSara FilaliInstitute of Astrophysics and Geophysics , Liège University , Allée du 6 Août 19c , 4000 Liège , BelgiumPaul HicksonDepartment of Physics and Astronomy , The University of British Columbia , 6224 Agricul- tural Road , Vancouver , BC V6T 1Z1 , CanadaGokul Singh MehraAryabhatta Research Institute of Observational Sciences (ARIES) , Manora Peak , Nainital - 263002 , IndiaKuntal MisraAryabhatta Research Institute of Observational Sciences (ARIES) , Manora Peak , Nainital - 263002 , IndiaVibhore NegiKavli Institute for Astronomy and Astrophysics , Peking University , Beijing 100871 , ChinaKumar PranshuDepartment of Applied Optics and Photonics , University of Calcutta , Kolkata , 700106 , IndiaJean SurdejAryabhatta Research Institute of Observational Sciences (ARIES) , Manora Peak , Nainital - 263002 , IndiaSarvesh Kumar Yadav

2026

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ABI

Annotatsiya

The two 4-m class telescopes at the Devasthal site in India are complementary: the 4-m International Liquid Mirror Telescope (ILMT) is dedicated to the discovery of new transient phenomena, which can be followed up using the 3.6-m Devasthal Optical Telescope (DOT) for their optical characterisation. The ILMT continuously surveys a $22.3^\prime \times 22.3^\prime$ wide strip of the zenith sky. A dedicated transient detection and classification pipeline, PyLMT, based on optimised image subtraction and convolutional neural network (CNN) techniques, enables the discovery of numerous photometric transients with the ILMT. However, these transient discoveries still require spectroscopic confirmation to determine their types, for which spectra obtained with the DOT are essential. Here, we present a selection of photometric transients, specifically supernova candidates. We investigate their photometric and spectroscopic properties using ILMT light curves, supplemented with ZTF data and DOT spectroscopic observations.

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DOI: 10.48550/arxiv.2610.18909

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