Preprint

Automated transient detection in the context of the 4m ILMT

Kumar PranshuDepartment of Applied Optics and Photonics , University of Calcutta , Kolkata , 700106 , IndiaBhavya AilawadhiDepartment of Physics , Deen Dayal Upadhyaya Gorakhpur University , Gorakhpur , 273009 , IndiaTalat AkhunovUlugh Beg Astronomical Institute of the Uzbek Academy of Sciences , Astronomicheskaya 33 , 100052 Tashkent , UzbekistanE. F. BorraDepartment of Physics , Université Laval , 2325, rue de l'Université , Québec , G1V 0A6 , CanadaMonalisa DubeyDepartment of Applied Physics , Mahatma Jyotiba Phule Rohilkhand University , Bareilly , 243006 , IndiaNaveen DukiyaDepartment of Applied Physics , Mahatma Jyotiba Phule Rohilkhand University , Bareilly , 243006 , IndiaJiuyang FuDepartment of Physics and Astronomy , University of British Columbia , 6224 Agricultural Road , Vancouver , BC V6T 1Z1 , CanadaBaldeep GrewalDepartment of Physics and Astronomy , University of British Columbia , 6224 Agricultural Road , Vancouver , BC V6T 1Z1 , CanadaPaul HicksonDepartment of Physics and Astronomy , University of British Columbia , 6224 Agricultural Road , Vancouver , BC V6T 1Z1 , CanadaBrajesh KumarAryabhatta Research Institute of Observational sciencES (ARIES) , Manora Peak , Nainital , 263001 , IndiaKuntal MisraAryabhatta Research Institute of Observational sciencES (ARIES) , Manora Peak , Nainital , 263001 , IndiaVibhore NegiAryabhatta Research Institute of Observational sciencES (ARIES) , Manora Peak , Nainital , 263001 , IndiaEthen SunDepartment of Physics and Astronomy , University of British Columbia , 6224 Agricultural Road , Vancouver , BC V6T 1Z1 , CanadaJean SurdejInstitute of Astrophysics and Geophysics , University of Liège , Allée du 6 Août 19c , 4000 Liège , Belgium

2023en

ABI

Annotatsiya

In the era of sky surveys like Palomar Transient Factory (PTF), Zwicky Transient Facility (ZTF) and the upcoming Vera Rubin Observatory (VRO) and ILMT, a plethora of image data will be available. ZTF scans the sky with a field of view of 48 deg$^{2}$ and VRO will have a FoV of 9.6 deg$^{2}$ but with a much larger aperture. The 4m ILMT covers a 22$'$ wide strip of the sky. Being a zenith telescope, ILMT has several advantages like low observation air mass, best image quality, minimum light pollution and no pointing time loss. Transient detection requires all these imaging data to be processed through a Difference Imaging Algorithm (DIA) followed by subsequent identification and classification of transients. The ILMT is also expected to discover several known and unknown astrophysical objects including transients. Here, we propose a pipeline with an image subtraction algorithm and a convolutional neural network (CNN) based automated transient discovery and classification system. The pipeline was tested on ILMT data and the transients as well as variable candidates were recovered and classified.

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DOI: 10.48550/arxiv.2311.04716

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