3D hydrodynamic simulations of white dwarf-main-sequence star collisions-II. Off-centre collisions
Stellar collisions have garnered renewed attention for their role in the formation of peculiar objects, such as blue stragglers, and their potential to explain transients with atypical observational and spectroscopic signatures. Among these, white dwarf-main sequence (WD-MS) collisions are particula...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/391016 |
| Acceso en línea: | http://hdl.handle.net/10261/391016 https://api.elsevier.com/content/abstract/scopus_id/105000651439 |
| Access Level: | acceso abierto |
| Palabra clave: | Binaries: general Globular clusters: general Hydrodynamics Nuclear reactions Nucleosynthesis, abundances Stars: mass-loss |
| Sumario: | Stellar collisions have garnered renewed attention for their role in the formation of peculiar objects, such as blue stragglers, and their potential to explain transients with atypical observational and spectroscopic signatures. Among these, white dwarf-main sequence (WD-MS) collisions are particularly intriguing due to the diverse evolutionary pathways they can produce-such as peculiar red giants, novae, or sub-Chandrasekhar supernovae. We present 3D smoothed particle hydrodynamics (SPH) simulations of WD-MS collisions, exploring a range of mass ratios and impact parameters. We analyze the dynamics, energetics, gas morphology, and mass-loss from these interactions. Using a 34-isotope nuclear network, we further predict the nucleosynthesis products generated during these collisions. Our models suggest that at early times the ejecta have a bipolar structure and, along with the stellar remnant, may be enriched in isotopes such as 13C, 15N, and 17O. In the case of near head-on collisions, the ejecta may also show an overabundance of 7Li relative to solar values. |
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