M. ErmannM. AjelloA. AlbertL. BaldiniJ. BalletG. BarbielliniD. BastieriR. BellazziniE. BissaldiR. D. BlandfordE. D. BloomE. BottaciniT. J. BrandtJ. BregeonP. BruelR. BuehlerS. BusonG. A. CaliandroR. A. CameronM. CaragiuloP. A. CaraveoE. CavazzutiE. CharlesA. ChekhtmanC. C. CheungJ. ChiangG. ChiaroS. CipriniR. ClausJ. Cohen-TanugiJ. ConradS. CorbelF. D'AmmandoA. De AngelisP. R. Den HartogF. De PalmaC. D. DermerR. DesianteS. W. DigelL. Di VenereE. Do Couto E SilvaD. DonatoP. S. DrellA. Drlica-WagnerC. FavuzziE. C. FerraraW. B. FockeA. FranckowiakL. FuhrmannY. FukazawaP. FuscoF. GarganoD. GasparriniS. GermaniN. GigliettoF. GiordanoM. GirolettiT. GlanzmanG. GodfreyI. A. GrenierJ. E. GroveS. GuiriecD. HadaschA. K. HardingM. HayashidaE. HaysJ. W. HewittA. B. HillX. HouP. JeanT. JoglerG. JóhannessonA. S. JohnsonW. N. JohnsonM. KerrJ. KnödlsederDeutsche Elektronen-SynchrotronClemson UniversityKavli Institute for Particle Astrophysics and CosmologyIstituto Nazionale di Fisica Nucleare, RomaInstitut de Recherche sur les Lois Fondamentales de l'UniversUniversita degli Studi di TriesteIstituto Nazionale Di Fisica Nucleare, Sezione di PadovaUniversita degli Studi di PadovaNASA Goddard Space Flight CenterLaboratoire Univers et Particules de MontpellierLaboratoire Leprince-RinguetConsorzio Interuniversitario per la Fisica Spaziale (CIFS)INAF Istituto di Astrofisica Spaziale e Fisica Cosmica, MilanAgenzia Spaziale ItalianaGeorge Mason University, Fairfax CampusNaval Research LaboratoryOsservatorio Astronomico di RomaStockholms universitetOskar Klein Centre for Cosmoparticle PhysicsK. A. Wallenberg FoundationKungl. VetenskapsakademienInstitut Universitaire de FranceIstituto Di Radioastronomia, BolognaAlma Mater Studiorum Universita di BolognaUniversita degli Studi di UdineUniversita degli Studi di BariUniversity of MarylandFermi National Accelerator LaboratoryMax Planck Institut fur RadioastronomieHiroshima UniversityUniversita degli Studi di PerugiaNASA Postdoctoral Program FellowMedizinische Universitat InnsbruckUniversity of TokyoUniversity of Maryland, Baltimore CountyUniversity of SouthamptonMarie Curie IOFCentre d'Etudes Nucleaires de Bordeaux GradignanCNRS Centre National de la Recherche ScientifiqueUniversite de ToulouseUniversity Science Institute ReykjavikAustralia Telescope National FacilityYale UniversityMahidol UniversityUniversity of California, Irvine2018-11-092018-11-092014-08-01Science. Vol.345, No.6196 (2014), 554-55810959203003680752-s2.0-84905901421https://repository.li.mahidol.ac.th/handle/123456789/34969A classical nova results from runaway thermonuclear explosions on the surface of a white dwarf that accretes matter from a low-mass main-sequence stellar companion. In 2012 and 2013, three novae were detected in γ rays and stood in contrast to the first γ-ray-detected nova V407 Cygni 2010, which belongs to a rare class of symbiotic binary systems. Despite likely differences in the compositions and masses of their white dwarf progenitors, the three classical novae are similarly characterized as soft-spectrum transient γ-ray sources detected over 2- to 3-week durations. The γ-ray detections point to unexpected high-energy particle acceleration processes linked to the mass ejection from thermonuclear explosions in an unanticipated class of Galactic γ-ray sources.Mahidol UniversityMultidisciplinaryArticleSCOPUS10.1126/science.1253947