Non-thermal radio emission from colliding flows in classical nova V1723 Aql

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DOIResolve DOI: http://doi.org/10.1093/mnras/stv3019
AuthorSearch for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for: ; Search for:
TypeArticle
Journal titleMonthly Notices of the Royal Astronomical Society
ISSN0035-8711
1365-2966
Volume457
Issue1
Pages887901
SubjectBinaries; Novae; Cataclysmic variables; White dwarfs; Radio continuum; Star winds; Star outflow
AbstractThe importance of shocks in nova explosions has been highlighted by Fermi's discovery of γ-ray-producing novae. Over three years of multiband Very Large Array radio observations of the 2010 nova V1723 Aql show that shocks between fast and slow flows within the ejecta led to the acceleration of particles and the production of synchrotron radiation. Soon after the start of the eruption, shocks in the ejecta produced an unexpected radio flare, resulting in a multipeaked radio light curve. The emission eventually became consistent with an expanding thermal remnant with mass 2 × 10⁻⁴ M⊙ and temperature 10⁴ K. However, during the first two months, the ≳10⁶ K brightness temperature at low frequencies was too high to be due to thermal emission from the small amount of X-ray-producing shock-heated gas. Radio imaging showed structures with velocities of 400 km s⁻¹ (d/6 kpc) in the plane of the sky, perpendicular to a more elongated 1500 km s⁻¹ (d/6 kpc) flow. The morpho-kinematic structure of the ejecta from V1723 Aql appears similar to nova V959 Mon, where collisions between a slow torus and a faster flow collimated the fast flow and gave rise to γ-ray-producing shocks. Optical spectroscopy and X-ray observations of V1723 Aql during the radio flare are consistent with this picture. Our observations support the idea that shocks in novae occur when a fast flow collides with a slow collimating torus. Such shocks could be responsible for hard X-ray emission, γ-ray production, and double-peaked radio light curves from some classical novae.
Publication date
PublisherOxford University Press
LanguageEnglish
AffiliationNational Science Infrastructure; National Research Council Canada
Peer reviewedYes
NPARC number23000098
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Record identifierf7831e8b-ed23-4eaa-9e90-b5765fc6deee
Record created2016-06-02
Record modified2016-06-02
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