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Insights into the evolution of symbiotic recurrent novae from radio synchrotron emission: V745 Scorpii and RS Ophiuchi

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dc.contributor.author Kantharia, N. G
dc.contributor.author Dutta, P
dc.contributor.author Roy, N
dc.contributor.author Anupama, G. C
dc.contributor.author Ishwara-Chandra, C. H
dc.contributor.author Chitale, A
dc.contributor.author Prabhu, T. P
dc.contributor.author Banerjee, D. P. K
dc.contributor.author Ashok, N. M
dc.date.accessioned 2020-11-20T13:35:49Z
dc.date.available 2020-11-20T13:35:49Z
dc.date.issued 2016-02
dc.identifier.citation Monthly Notices of the Royal Astronomical Society, Vol. 456, No. 1, L49-L53 en_US
dc.identifier.issn 1365-2966
dc.identifier.uri http://prints.iiap.res.in/handle/2248/7350
dc.description Restricted Access © Royal Astronomical Society http://dx.doi.org/10.1093/mnrasl/slv154 en_US
dc.description.abstract We present observations at 610 and 235 MHz using the Giant Metrewave Radio Telescope (GMRT) of the recurrent nova V745 Scorpii which recorded its last outburst on 2014 February 6. This is the second symbiotic recurrent nova whose light curve at low frequencies has been followed in detail, the first being RS Ophiuchi in 2006. We fitted the 610 MHz light curve by a model of synchrotron emission from an expanding shell being modified by radiative transfer effects due to local absorbing gas consisting of a uniformly distributed and a clumpy component. Using our model parameters, we find that the emission at 235 MHz peaked around day 35 which is consistent with our GMRT observations. The two main results of our study are (1) The radio emission at a given frequency is visible sooner after the outburst in successive outbursts of both V745 Scorpii and RS Ophiuchi. The earlier detection of radio emission is interpreted to be caused by decreasing foreground densities. (2) The clumpy material, if exists, is close to the white dwarf and can be interpreted as being due to the material from the hot accretion disc. The uniform density gas is widespread and attributed to the winds blown by the white dwarf. We present implications of these results on the evolution of both novae. Such studies along with theoretical understanding have the potential of resolving several outstanding issues such as why all recurrent novae are not detectable in synchrotron radio and whether recurrent novae are progenitor systems of Type 1a supernova. en_US
dc.language.iso en en_US
dc.publisher Oxford University Press on behalf of the Royal Astronomical Society en_US
dc.subject Binaries: symbiotic en_US
dc.subject Stars: dwarf novae en_US
dc.subject Radio continuum: stars en_US
dc.title Insights into the evolution of symbiotic recurrent novae from radio synchrotron emission: V745 Scorpii and RS Ophiuchi en_US
dc.type Article en_US

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