Limits on non-thermal radio emission from Nova Cephei 2013
ATel #5375; Prasun Dutta (NCRA-TIFR), Nimisha G. Kantharia (NCRA-TIFR), Nirupam Roy (MPIfR), G. C. Anupama (IIA), N. M. Ashok (PRL), Dipankar P. K. Banerjee (PRL)
on 8 Sep 2013; 11:56 UT
Credential Certification: Nirupam Roy (roy.nirupam@gmail.com)
Referred to by ATel #: 5389
Nova Cephei 2013, discovered on 2013 Feb. 02 (CBET #3397), was observed at low
radio frequency with the Giant Metrewave Radio Telescope (GMRT) on 2013 June 1
(at 1.3 GHz) and Aug 23 (610 MHz) using director's discretionary time. No
radio emission was detected in either epochs down to the rms noise level of
120 microJy at 1.3 GHz and 70 microJy at 610 MHz. Observations at other
wavelengths earlier reported no detectable X-ray emission (ATel #4950), but
clear indication of ongoing dust formation (ATel #4893, #5026 and #5269). VLA
observations at higher radio frequencies reported detection at 7.4 and 36.5
GHz (ATel #4950). Using this, and assuming an early-time S_\nu ~ t^2 \nu^2
behaviour, the GMRT observations rule out, at 3sigma level, any non-thermal
emission brighter than 330 and 190 microJy, respectively, for these two epochs
of observation.
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).