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Multiple outflows and delayed ejections revealed by early imaging of novae

E. AydiCenter for Data Intensive and Time Domain Astronomy, Department of Physics and Astronomy, Michigan State University, East Lansing, MI USAJohn D. MonnierAstronomy Department, University of Michigan, Ann Arbor, MI USAA. MérandEuropean Southern Observatory, Garching, GermanyGail SchaeferThe CHARA Array of Georgia State University, Mount Wilson Observatory, Mount Wilson, CA USALaura ChomiukCenter for Data Intensive and Time Domain Astronomy, Department of Physics and Astronomy, Michigan State University, East Lansing, MI USAM. Otulakowska-HypkaAstronomical Observatory Institute, Faculty of Physics and Astronomy, Adam Mickiewicz University, Poznań, PolandJhih-Ling FanDepartment of Physics, National Cheng Kung University, Tainan City, TaiwanKwan-Lok LiDepartment of Physics, National Cheng Kung University, Tainan City, TaiwanK. V. SokolovskyDepartment of Astronomy, University of Illinois at Urbana-Champaign, Urbana, IL USAR. SalinasNicolaus Copernicus Astronomical Center, Polish Academy of Sciences, Warsaw, PolandM. A. TuckerCenter for Cosmology and AstroParticle Physics, Columbus, OH USAB. J. ShappeeInstitute for Astronomy, University of Hawai'i, Honolulu, HI USAR. J. RudyKookoosint Scientific, Camarillo, CA USAK. L. PageSchool of Physics and Astronomy, University of Leicester, Leicester, UKN. P. M. KuinUniversity College London, Mullard Space Science Laboratory, Holmbury House, Dorking, UKD. A. H. BuckleyDepartment of Astronomy, University of Cape Town, Rondebosch, South AfricaPeter CraigCenter for Data Intensive and Time Domain Astronomy, Department of Physics and Astronomy, Michigan State University, East Lansing, MI USAL. IzzoNiels Bohr Institute, University of Copenhagen, DARK, Copenhagen, DenmarkJustin D. LinfordNational Radio Astronomy Observatory, Socorro, NM USABrian D. MetzgerCenter for Computational Astrophysics, Flatiron Institute, New York, NY USAK. MukaiCRESST and X-ray Astrophysics Laboratory, NASA/GSFC, Greenbelt, MD USAMarina OrioDepartment of Astronomy, University of Wisconsin, Madison, WI USAKen J. ShenDepartment of Astronomy and Theoretical Astrophysics Center, University of California, Berkelely, Berkeley, CA USAJay StraderCenter for Data Intensive and Time Domain Astronomy, Department of Physics and Astronomy, Michigan State University, East Lansing, MI USAJ. L. SokoloskiColumbia Astrophysics Laboratory and Department of Physics, Columbia University, New York, NY USAR. E. WilliamsDepartment of Astronomy and Astrophysics, University of California, Santa Cruz, Santa Cruz, CA USAM. WilliamsPhysics Department, New Mexico Tech, Socorro, NM USAGesesew R HabtieDepartment of Physics, Debre Berhan University, Debre Berhan, EthiopiaStefan KrausAstrophysics Group, Department of Physics and Astronomy, University of Exeter, Exeter, UKNarsireddy AnuguThe CHARA Array of Georgia State University, Mount Wilson Observatory, Mount Wilson, CA USAJean-Baptiste Le BouquinInstitut de Planetologie et d'Astrophysique de Grenoble, Grenoble, FranceSorabh ChhabraAstrophysics Group, Department of Physics and Astronomy, University of Exeter, Exeter, UKIsabelle CodronAstrophysics Group, Department of Physics and Astronomy, University of Exeter, Exeter, UKTyler GardnerCooperative Institute for Research in Environmental Sciences, 216 UCB, University of Colorado Boulder, Boulder, CO USAMayra GutierrezAstronomy Department, University of Michigan, Ann Arbor, MI USANoura IbrahimAstronomy Department, University of Michigan, Ann Arbor, MI USACyprien LanthermannThe CHARA Array of Georgia State University, Mount Wilson Observatory, Mount Wilson, CA USABenjamin R. SetterholmMax-Planck-Institut für Astronomie, Heidelberg, GermanyC. AshallInstitute for Astronomy, University of Hawai'i, Honolulu, HI USAJason T. HinkleInstitute for Astronomy, University of Hawai'i, Honolulu, HI USAThomas de JaegerL'École Pour l'Informatique et les Techniques Avancées, EPITA, Le Kremlin-Bicêtre, FranceA. V. PayneSpace Telescope Science Institute, Baltimore, MD USA

Nature Astronomyjournal2025en

ABI

Аннотация

Novae are thermonuclear eruptions on accreting white dwarfs in interacting binaries. Although most of the accreted envelope is expelled, the mechanism-impulsive ejection, multiple outflows or prolonged winds, or a common-envelope interaction-remains uncertain. Gigaelectronvolt γ-ray detections from >20 Galactic novae establish these eruptions as nearby laboratories for shock physics and particle acceleration, underscoring the need to determine how novae eject their envelopes. Here we report on near-infrared interferometry, supported by multiwavelength observations, of two γ-ray-detected novae. The images of the very fast 2021 nova V1674 Her, taken just 2-3 days after discovery, reveal the presence of two perpendicular outflows. The interaction between these outflows probably drives the observed γ-ray emission. Conversely, the images of the very slow 2021 nova V1405 Cas suggest that the bulk of the accreted envelope was ejected more than 50 days after the eruption began, as the nova slowly rose to its visible peak, during which the envelope engulfed the system in a common-envelope phase. These images offer direct observational evidence that the mechanisms driving mass ejection from the surfaces of accreting white dwarfs are not as simple as previously thought, revealing multiple outflows and delayed ejections.

Мавзулар

Astrophysical Phenomena and Observations Astronomy and Astrophysical Research Astrophysics and Star Formation Studies

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DOI: 10.1038/s41550-025-02725-1

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