| Name: | Nayana A.J. |
| Affiliation: | Indian Institute of Astrophysics |
| Conference ID : | ASI2023_624 |
| Title : | Shock-driven synchrotron emission from the 2021 outburst of RS Ophiuchi |
| Authors : | Nayana A.J. (IIA), G.C. Anupama (IIA), Nirupam Roy (IISc)
Dipankar Banerjee (PRL), K.P. Singh (TIFR), Sonith L.S (IIA), and U S Kamath (IIA)
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| Mode of Presentation: | Oral |
| Abstract Category : | Stars, ISM and Galaxy |
| Abstract : | We present low-frequency radio observations of the 2021 outburst of the
Galactic symbiotic recurrent nova, RS Ophiuchi. Our observations span t ~ 25-287
days post outburst at frequencies 0.15 to 1.4 GHz. Our study reports the
first lowest frequency (0.15 GHz) radio detection of a recurrent nova.
The near-simultaneous spectral indices are alpha ~ -0.8 (F_nu \propto
nu^alpha), indicating a non-thermal origin of radio emission in the
observed frequencies. Radio light curves are well represented by a
shock-driven synchrotron emission initially suppressed by fore-ground
absorption due to an ionized clumpy circumburst medium. We estimate the
mass-loss rate of the red giant secondary to be ~ 3.2 X 10^-6
Msun/year for a stellar wind velocity of 20 km/s. The detection at 0.15
GHz in 2021, while there was no detection at this frequency during
previous outbursts (1985 and 2006) indicates lower foreground absorption
in the line of sight during the 2021 outburst.
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