Publikace ÚTF

Direct evidence for shock-powered optical emission in a nova

Aydi, Elias; Sokolovsky, Kirill V.; Chomiuk, Laura; Steinberg, Elad; Li, Kwan Lok; Vurm, Indrek; Metzger, Brian D.; Strader, Jay; Mukai, Koji; Pejcha, Ondrej; Shen, Ken J.; Wade, Gregg A.; Kuschnig, Rainer; Moffat, Anthony F. J.; Pablo, Herbert; Pigulski, Andrzej; Popowicz, Adam; Weiss, Werner; Zwintz, Konstanze; Izzo, Luca Pollard, Karen R.; Handler, Gerald; Ryder, Stuart D.; Filipovic, Miroslav D.; Alsaberi, Rami Z. E.; Manojlovic, Perica; Lopes de Oliveira, Raimundo; Walter, Frederick M.; Vallely, Patrick J.; Buckley, David A. H.; Brown, Michael J. I.; Harvey, Eamonn J.; Kawash, Adam; Kniazev, Alexei; Kochanek, Christopher S.; Linford, Justin; Mikolajewska, Joanna; Molaro, Paolo; Orio, Marina; Page, Kim L.; Shappee, Benjamin J.; Sokoloski, Jennifer L.

Classical novae are thermonuclear explosions that occur on the surfaces of white dwarf stars in interacting binary systems1. 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 runaway2. However, recent observations of gigaelectronvolt ?-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 mergers3, supernovae4 and tidal disruption events5, but observational confirmation has been lacking. Here we report simultaneous space-based optical and ?-ray observations of the 2018 nova V906 Carinae (ASASSN-18fv), revealing a remarkable series of distinct correlated flares in both bands. The optical and ?-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 ?-ray, provide direct evidence that shocks can power substantial luminosity in classical novae and other optical transients.
type:article
journal:Nature Astronomy
volume:4
nr:0
pages:776-780
year:2020
eprint:2004.05562
grants:Cat-In-hAT: Catastrophic Interactions of Binary Stars and the Associated Transients, Horizon 2020 ERC Starting Grant 803158; 2019-2023; hlavní řešitel: Ondřej Pejcha
Časová proměnnost v astronomii: účast v projektu All-Sky Automated Survey for Supernovae; 2019-2022; hlavní řešitel: Ondřej Pejcha
files:
aydi_et_al_including_pejcha_v906_main.pdf (1620.5 kB)

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