Time-resolved hadronic particle acceleration in the recurrent Nova RS Ophiuchi

preprint2022arXivOpen access

H. E. S. S. Collaboration F. Aharonian F. Ait Benkhali E. O. Angüner H. Ashkar M. Backes V. Baghmanyan V. Barbosa Martins R. Batzofin Y. Becherini D. Berge K. Bernlöhr B. Bi M. Böttcher C. Boisson J. Bolmont M. de Bony de Lavergne M. Breuhaus R. Brose F. Brun S. Caroff S. Casanova M. Cerruti T. Chand A. Chen G. Cotter J. Damascene Mbarubucyeye A. Djannati-Ataï A. Dmytriiev V. Doroshenko C. Duffy K. Egberts J. -P. Ernenwein S. Fegan K. Feijen A. Fiasson G. Fichet de Clairfontaine G. Fontaine M. Füßling S. Funk S. Gabici Y. A. Gallant S. Ghafourizadeh G. Giavitto L. Giunti D. Glawion J. F. Glicenstein M. -H. Grondin G. Hermann J. A. Hinton M. Hörbe W. Hofmann C. Hoischen T. L. Holch M. Holler D. Horns Zhiqiu Huang M. Jamrozy F. Jankowsky I. Jung-Richardt E. Kasai K. Katarzyński U. Katz D. Khangulyan B. Khélifi S. Klepser W. Kluźniak Nu. Komin R. Konno K. Kosack D. Kostunin S. Le Stum A. Lemière M. Lemoine-Goumard J. -P. Lenain F. Leuschner T. Lohse A. Luashvili I. Lypova J. Mackey D. Malyshev V. Marandon P. Marchegiani A. Marcowith G. Martí-Devesa R. Marx G. Maurin M. Meyer A. Mitchell R. Moderski L. Mohrmann A. Montanari E. Moulin J. Muller T. Murach K. Nakashima M. de Naurois A. Nayerhoda J. Niemiec A. Priyana Noel P. O'Brien S. Ohm L. Olivera-Nieto E. de Ona Wilhelmi M. Ostrowski S. Panny M. Panter R. D. Parsons G. Peron S. Pita V. Poireau D. A. Prokhorov H. Prokoph G. Pühlhofer M. Punch A. Quirrenbach P. Reichherzer A. Reimer O. Reimer M. Renaud B. Reville F. Rieger G. Rowell B. Rudak H. Rueda Ricarte E. Ruiz-Velasco V. Sahakian S. Sailer H. Salzmann D. A. Sanchez A. Santangelo M. Sasaki J. Schäfer F. Schüssler H. M. Schutte U. Schwanke M. Senniappan J. N. S. Shapopi R. Simoni A. Sinha H. Sol A. Specovius S. Spencer Ł. Stawarz S. Steinmassl C. Steppa T. Takahashi T. Tanaka A. M. Taylor R. Terrier C. Thorpe-Morgan M. Tsirou N. Tsuji R. Tuffs Y. Uchiyama T. Unbehaun C. van Eldik B. Van Soelen J. Veh C. Venter J. Vink S. J. Wagner F. Werner R. White A. Wierzcholska Yu Wun Wong A. Yusafzai M. Zacharias D. Zargaryan A. A. Zdziarski A. Zech S. J. Zhu S. Zouari N. Żywucka

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Recurrent Novae are repeating thermonuclear explosions in the outer layers of white dwarfs, due to the accretion of fresh material from a binary companion. The shock generated by ejected material slamming into the companion star's wind, accelerates particles to very-high-energies. We report very-high-energy (VHE, $\gtrsim100$ \,GeV) gamma rays from the recurrent nova RS\,Ophiuchi up to a month after its 2021 outburst, using the High Energy Stereoscopic System. The VHE emission has a similar temporal profile to lower-energy GeV emission, indicating a common origin, with a two-day delay in peak flux. These observations constrain models of time-dependent particle energization, favouring a hadronic emission scenario over the leptonic alternative. This confirms that shocks in dense winds provide favourable environments for efficient cosmic-ray acceleration to very-high-energies.

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Time-resolved hadronic particle acceleration in the recurrent Nova RS Ophiuchi

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