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@article{faucris.276329644,
abstract = {Novae are caused by runaway thermonuclear burning in the hydrogen-rich envelopes of accreting white dwarfs, which leads to a rapid expansion of the envelope and the ejection of most of its mass1,2. Theory has predicted the existence of a ‘fireball’ phase following directly on from the runaway fusion, which should be observable as a short, bright and soft X-ray flash before the nova becomes visible in the optical3–5. Here we report observations of a bright and soft X-ray flash associated with the classical Galactic nova YZ Reticuli 11 h before its 9 mag optical brightening. No X-ray source was detected 4 h before and after the event, constraining the duration of the flash to shorter than 8 h. In agreement with theoretical predictions4,6–8, the source’s spectral shape is consistent with a black-body of 3.27+0.11−0.33 × 105 K (28.2+0.9−2.8 eV), or a white dwarf atmosphere, radiating at the Eddington luminosity, with a photosphere that is only slightly larger than a typical white dwarf.},
author = {König, Ole and Wilms, Jörn and Arcodia, Riccardo and Dauser, Thomas and Dennerl, Konrad and Doroshenko, Victor and Haberl, Frank and Hämmerich, Steven and Kirsch, Christian and Kreykenbohm, Ingo and Lorenz, Maximilian and Malyali, Adam and Merloni, Andrea and Rau, Arne and Rauch, Thomas and Sala, Gloria and Schwope, Axel and Suleimanov, Valery and Weber, Philipp and Werner, Klaus},
doi = {10.1038/s41586-022-04635-y},
faupublication = {yes},
journal = {Nature},
note = {CRIS-Team Scopus Importer:2022-06-03},
pages = {248-250},
peerreviewed = {Yes},
title = {{X}-ray detection of a nova in the fireball phase},
volume = {605},
year = {2022}
}