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Direct evidence for shock-powered optical emission in a nova | Elias Aydi
; Kirill V. Sokolovsky
; Laura Chomiuk
; Elad Steinberg
; Kwan Lok Li
; Indrek Vurm
; Brian D. Metzger
; Jay Strader
; Koji Mukai
; Ondřej Pejcha
; Ken J. Shen
; Gregg A. Wade
; Rainer Kuschnig
; Anthony F. J. Moffat
; Herbert Pablo
; Andrzej Pigulski
; Adam Popowicz
; Werner Weiss
; Konstanze Zwintz
; Luca Izzo
; Karen R. Pollard
; Gerald Handler
; Stuart D. Ryder
; Miroslav D. Filipović
; Rami Z. E. Alsaberi
; Perica Manojlović
; Raimundo Lopes de Oliveira
; Frederick M. Walter
; Patrick J. Vallely
; David A. H. Buckley
; Michael J. I. Brown
; Eamonn J. Harvey
; Adam Kawash
; Alexei Kniazev
; Christopher S. Kochanek
; Justin Linford
; Joanna Mikolajewska
; Paolo Molaro
; Marina Orio
; Kim L. Page
; Benjamin J. Shappee
; Jennifer L. Sokoloski
; | Date: |
12 Apr 2020 | Abstract: | Classical novae are thermonuclear explosions that occur on the surfaces of
white dwarf stars in interacting binary systems (Bode & Evans 2008). It has
long been thought that the luminosity of classical novae is powered by
continued nuclear burning on the surface of the white dwarf after the initial
runaway (Gallaher & Starrfield 1978). However, recent observations of GeV
$gamma$-rays from classical novae have hinted that shocks internal to the nova
ejecta may dominate the nova emission. Shocks have also been suggested to power
the luminosity of events as diverse as stellar mergers (Metzger & Pejcha 2017),
supernovae (Moriya et al. 2018), and tidal disruption events (Roth et al.
2016), but observational confirmation has been lacking. Here we report
simultaneous space-based optical and $gamma$-ray observations of the 2018 nova
V906 Carinae (ASASSN-18fv), revealing a remarkable series of distinct
correlated flares in both bands. The optical and $gamma$-ray flares occur
simultaneously, implying a common origin in shocks. During the flares, the nova
luminosity doubles, implying that the bulk of the luminosity is shock-powered.
Furthermore, we detect concurrent but weak X-ray emission from deeply embedded
shocks, confirming that the shock power does not appear in the X-ray band and
supporting its emergence at longer wavelengths. Our data, spanning the spectrum
from radio to $gamma$-ray, provide direct evidence that shocks can power
substantial luminosity in classical novae and other optical transients. | Source: | arXiv, 2004.5562 | Services: | Forum | Review | PDF | Favorites |
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