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Low radio frequency observation of Nova Delphini 2013

ATel #5376; Nirupam Roy (MPIfR), Nimisha G. Kantharia (NCRA-TIFR), Prasun Dutta (NCRA-TIFR), G. C. Anupama (IIA), N. M. Ashok (PRL), Dipankar P. K. Banerjee (PRL)
on 8 Sep 2013; 12:01 UT
Credential Certification: Nirupam Roy (roy.nirupam@gmail.com)

Subjects: Radio, Nova

Nova Delphini 2013 (ATel #5279), a very fast (ATel #5297), optically bright FeII type classical nova on a CO white dwarf (ATel #5282, #5304, #5337), was observed with the Giant Metrewave Radio Telescope (GMRT) on August 28, 2013 (~2 weeks after the outburst). No radio continuum counterpart is detected at the position of the nova down to the 3sigma flux density limit of 150 microJy at 1.3 GHz. Earlier observations with the VLA and the CARMA also detected no radio emission at 5 - 96 GHz (ATel #5298), constraining the distance to be more than 2 kpc. Interestingly, gamma rays are detected from this nova by the Fermi Large Area Telescope (LAT), whereas no X-ray emission is detected so far (ATel #5283, #5305, #5318).

Assuming the presence of a relativistic population of particles in the system since gamma rays have been detected, we use equipartition of energy to estimate the minimum magnetic field from our limit at 1.3 GHz. We constrain the magnetic field to be less than 3.9 G assuming that the distance to the nova is 3.5 kpc (ATel #5297) and the emitting region is 0.1 AU. Alternatively the radio synchrotron emission maybe heavily absorbed. Further multiwavelength monitoring of this interesting source is highly encouraged.

We thank the staff of the GMRT who made these observations possible. The GMRT is operated by the National Centre for Radio Astrophysics of the Tata Institute of Fundamental Research (NCRA-TIFR).