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| Natura: | Preprint |
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2025
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| Accesso online: | https://arxiv.org/abs/2512.05220 |
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| author | Aydi, Elias Monnier, John D. Mérand, Antoine Schaefer, Gail H. Chomiuk, Laura Otulakowska-Hypka, Magdalena Fan, Jhih-Ling Li, Kwan Lok Sokolovsky, Kirill V. Salinas, Ricardo Tucker, Michael Shappee, Benjamin Rudy, Richard Page, Kim L. Kuin, N. Paul M. Buckley, David A. H. Craig, Peter Izzo, Luca Linford, Justin Metzger, Brian D. Mukai, Koji Orio, Marina Shen, Ken J. Strader, Jay Sokoloski, Jennifer L. Williams, Robert E. Williams, Montana N. Habtie, Gesesew R. Kraus, Stefan Anugu, Narsireddy Bouquin, Jean-Baptiste Le Chhabra, Sorabh Codron, Isabelle Gardner, Tyler Gutierrez, Mayra Ibrahim, Noura Lanthermann, Cyprien Setterholm, Benjamin R. Ashall, Christopher Hinkle, Jason T. de Jaeger, Thomas Payne, Anna V. |
| author_facet | Aydi, Elias Monnier, John D. Mérand, Antoine Schaefer, Gail H. Chomiuk, Laura Otulakowska-Hypka, Magdalena Fan, Jhih-Ling Li, Kwan Lok Sokolovsky, Kirill V. Salinas, Ricardo Tucker, Michael Shappee, Benjamin Rudy, Richard Page, Kim L. Kuin, N. Paul M. Buckley, David A. H. Craig, Peter Izzo, Luca Linford, Justin Metzger, Brian D. Mukai, Koji Orio, Marina Shen, Ken J. Strader, Jay Sokoloski, Jennifer L. Williams, Robert E. Williams, Montana N. Habtie, Gesesew R. Kraus, Stefan Anugu, Narsireddy Bouquin, Jean-Baptiste Le Chhabra, Sorabh Codron, Isabelle Gardner, Tyler Gutierrez, Mayra Ibrahim, Noura Lanthermann, Cyprien Setterholm, Benjamin R. Ashall, Christopher Hinkle, Jason T. de Jaeger, Thomas Payne, Anna V. |
| contents | 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. GeV $γ$-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 with 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 likely drives the observed $γ$-ray emission. Conversely, the images of the very slow 2021 nova V1405~Cas suggest a delay in the ejection of the bulk of the accreted envelope of more than 50 days after the start of eruption, as the nova slowly rises to visible peak and during which the envelope engulfed the system in a common envelope phase. These unprecedented 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_05220 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Multiple outflows and delayed ejections revealed by early imaging of novae Aydi, Elias Monnier, John D. Mérand, Antoine Schaefer, Gail H. Chomiuk, Laura Otulakowska-Hypka, Magdalena Fan, Jhih-Ling Li, Kwan Lok Sokolovsky, Kirill V. Salinas, Ricardo Tucker, Michael Shappee, Benjamin Rudy, Richard Page, Kim L. Kuin, N. Paul M. Buckley, David A. H. Craig, Peter Izzo, Luca Linford, Justin Metzger, Brian D. Mukai, Koji Orio, Marina Shen, Ken J. Strader, Jay Sokoloski, Jennifer L. Williams, Robert E. Williams, Montana N. Habtie, Gesesew R. Kraus, Stefan Anugu, Narsireddy Bouquin, Jean-Baptiste Le Chhabra, Sorabh Codron, Isabelle Gardner, Tyler Gutierrez, Mayra Ibrahim, Noura Lanthermann, Cyprien Setterholm, Benjamin R. Ashall, Christopher Hinkle, Jason T. de Jaeger, Thomas Payne, Anna V. High Energy Astrophysical Phenomena Solar and Stellar Astrophysics 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. GeV $γ$-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 with 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 likely drives the observed $γ$-ray emission. Conversely, the images of the very slow 2021 nova V1405~Cas suggest a delay in the ejection of the bulk of the accreted envelope of more than 50 days after the start of eruption, as the nova slowly rises to visible peak and during which the envelope engulfed the system in a common envelope phase. These unprecedented 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. |
| title | Multiple outflows and delayed ejections revealed by early imaging of novae |
| topic | High Energy Astrophysical Phenomena Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2512.05220 |