Radio light curves and imaging of the helium nova V445 Puppis reveal seven years of synchrotron emission

Author:

Nyamai M M1ORCID,Chomiuk L2,Ribeiro V A R M34ORCID,Woudt P A1ORCID,Strader J2,Sokolovsky K V25ORCID

Affiliation:

1. Department of Astronomy, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa

2. Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA

3. Instituto de Telecomunicações, Campus Universitário de Santiago, P-3810-193 Aveiro, Portugal

4. Departamento de Física, Universidade de Aveiro, Campus Universitário de Santiago, P-3810-193 Aveiro, Portugal

5. Sternberg Astronomical Institute, Moscow State University, Universitetskii pr. 13, 119992 Moscow, Russia

Abstract

ABSTRACT V445 Puppis is the only helium nova observed to date; its eruption in late 2000 showed high velocities up to 8500 km s−1, and a remarkable bipolar morphology cinched by an equatorial dust disc. Here we present multifrequency radio observations of V445 Pup obtained with the Very Large Array (VLA) spanning 1.5–43.3 GHz, and between 2001 January and 2008 March (days ∼89–2700 after eruption). The radio light curve is dominated by synchrotron emission over these 7 yr, and shows four distinct radio flares. Resolved radio images obtained in the VLA’s A configuration show that the synchrotron emission hugs the equatorial disc, and comparisons to near-IR images of the nova clearly demonstrate that it is the densest ejecta – not the fastest ejecta – that are the sites of the synchrotron emission in V445 Pup. The data are consistent with a model where the synchrotron emission is produced by a wind from the white dwarf impacting the dense equatorial disc, resulting in shocks and particle acceleration. The individual synchrotron flares may be associated with density enhancements in the equatorial disc and/or velocity variations in the wind from the white dwarf. This overall scenario is similar to a common picture of shock production in hydrogen-rich classical novae, but V445 Pup is remarkable in that these shocks persist for almost a decade, much longer than the weeks or months for which shocks are typically observed in classical novae.

Funder

National Science Foundation

NASA

National Research Foundation

University of Cape Town

FCT

MCTES

Packard Foundation

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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