Communication Dans Un Congrès Année : 2024

Dust Growth in Binary Stars: The Path to Planet Formation in Multiple Stellar Systems

Résumé

Stars often form in multiple systems, where star-disc interactions influence protoplanetary disc dynamics and dust growth. In these systems, high dust velocity dispersion from gravitational effects of nearby companions can impede dust particle growth, yet the formation of substructures like spiral arms can enhance collision rates and growth potential due to increased density. Therefore, the impact of multiplicity on planet formation remains uncertain. To investigate this question, we conducted 3D hydrodynamical simulations of binary systems in both eccentric and circular orbits with circumstellar and circumbinary discs. The simulations incorporated dust growth and fragmentation over a total time of at least 10^5 years. Our analysis focused on dust spatial and size distributions to evaluate the planet-forming potential in binary systems. We studied in details the disc dynamics to understand the dust collision outcomes and explored streaming instability in regions favorable to growth. Preliminary results show that substructures in discs can overcome collisional velocity challenges, allowing dust aggregation. Circumstellar discs face growth complications due to companion star perturbations, whereas circumbinary discs show potential for dust growth with dust radial drift leading to dense clumping near the cavity edge. The initial conditions for planet-forming instabilities are met in high dust density regions of the disc. However, those potentially unstable regions are comparatively smaller compared to single star systems, highlighting the complexity and challenges of planet formation in binary systems and to a greater extent in multiple systems in general.

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Dates et versions

insu-04838857 , version 1 (15-12-2024)

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Antoine Alaguero, Nicolás Cuello, Pedro Poblete, Jean-François Gonzalez, François Ménard. Dust Growth in Binary Stars: The Path to Planet Formation in Multiple Stellar Systems. EAS2024/, 0000, à renseigner, Unknown Region. ⟨insu-04838857⟩
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