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http://hdl.handle.net/20.500.12386/32407
Title: | Direct evidence for shock-powered optical emission in a nova | Authors: | Aydi, Elias Sokolovsky, Kirill V. Chomiuk, Laura Steinberg, Elad Li, Kwan Lok Vurm, Indrek Metzger, Brian D. Strader, Jay Mukai, Koji Pejcha, Ondřej 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. Filipović, Miroslav D. Alsaberi, Rami Z. E. Manojlović, 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. |
Issue Date: | 2020 | Journal: | NATURE ASTRONOMY | Number: | 4 | First Page: | 776 | Abstract: | Classical novae are thermonuclear explosions that occur on the surfaces of white dwarf stars in interacting binary systems<SUP>1</SUP>. 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<SUP>2</SUP>. However, recent observations of gigaelectronvolt γ-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<SUP>3</SUP>, supernovae<SUP>4</SUP> and tidal disruption events<SUP>5</SUP>, but observational confirmation has been lacking. Here we report simultaneous space-based optical and γ-ray observations of the 2018 nova V906 Carinae (ASASSN-18fv), revealing a remarkable series of distinct correlated flares in both bands. The optical and γ-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 γ-ray, provide direct evidence that shocks can power substantial luminosity in classical novae and other optical transients. | URI: | http://hdl.handle.net/20.500.12386/32407 | URL: | https://www.nature.com/articles/s41550-020-1070-y | ISSN: | 2397-3366 | DOI: | 10.1038/s41550-020-1070-y | Bibcode ADS: | 2020NatAs...4..776A | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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File | Description | Size | Format | |
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2004.05562.pdf | preprint | 4.94 MB | Adobe PDF | View/Open |
s41550-020-1070-y.pdf | [Administrators only] | 1.6 MB | Adobe PDF |
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