uGMRT detection of Galactic Nova - V1405 Cas

ATel #15383; Nayana A. J. (IIA), G. C. Anupama (IIA), Dipankar Banerjee (PRL), Nirupam Roy (IISc), K. P. Singh (IISER-Mohali), S. Sonith (IIA), and U. S. Kamath (IIA)
on 18 May 2022; 09:17 UT
Credential Certification: Nayana AJ (nayana@ncra.tifr.res.in)

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We observed the classical nova V1405 Cas (a.k.a Nova Cassiopeiae 2021 = PNV J23244760+6111140) discovered by Yuji Nakamura on 2021 March 18.42 UTC (CBET #4945) with the upgraded Giant Metrewave Radio Telescope (uGMRT). The observations were done in band-3 (250-500 MHz) on 2022 April 22.01 UT (t ~ 399.6 days post outburst) and in band-4 (550-850 MHz) on 2022 April 23.04 UT (t ~ 400.6 days post outburst). We detect radio emission from V1405 Cas with a flux density 447 +/- 53 uJy at 649 MHz. The map resolution is 6.70 X 3.97 arcsec^2 and the source is unresolved. Radio emission is not detected in the band-3 map (central frequency 430 MHz) and the 3-sigma upper limit on the flux density at the source position is 300 uJy. Assuming the distance to V1405 Cas to be 1.7 Kpc (Bailer-Jones et al. 2018, AJ, 156, 58) and the expansion velocity to be 1200 km/s (ATel #14530) starting on 2021 March 18.42, the measured flux density of 447 uJy at 649 MHz corresponds to a brightness temperature ~ 1.2 X 10^4 K. More observations are planned. We thank the uGMRT staff for carrying out the observations.