Periodic Reporting for period 3 - PODCAST (Predictions and Observations for Discs: Planetary Cores and dust Aggregates from non-ideal MHD Simulations with radiative Transfer.)
Período documentado: 2023-02-01 hasta 2024-07-31
Recent observations have shown that planets seem to form much faster than expected. This ease of formation could explain their abundance in the universe, but calls into question the scenarios that explain their origins. Physical mechanisms still unknown are certainly to explain their formation so intense. The goal of the podcast is to understand what these mechanisms are by developing new analytical theories of numerical simulations and by confronting the predictions of these new models to the observations provided by large instruments such as the James Web Space telescope.
The societal impacts of the podcast project are multiple:
- To understand the origin of planets as a key step in the development of life in the universe,
- To discover physical mechanisms just ignored until now that allow us to understand how these planets form so quickly,
- To remove technical barriers to study these different processes, whether physical models or advanced numerical tools.
The overall objectives of the project is :
- to perform a quantitative simulation of the young dusty stellar objets up to the formation of planetary embryos,
- to interpret the results with novel theoretical models,
- to confront these models to observations.
The societal impacts of the podcast project are multiple:
- To understand the origin of planets as a key step in the development of life in the universe,
- To discover physical mechanisms just ignored until now that allow us to understand how these planets form so quickly,
- To remove technical barriers to study these different processes, whether physical models or advanced numerical tools.
The overall objectives of the project is :
- to perform a quantitative simulation of the young dusty stellar objets up to the formation of planetary embryos,
- to interpret the results with novel theoretical models,
- to confront these models to observations.
in the framework of the Podcast project, we have
- Developed a numerical code to compute the coagulation/fragmentation of solids extremely efficiently.
- Developed a formalism to understand the collapse of a star from a local point of view and implemented it in a numerical code.
- Developed a formalism to understand the behavior of solids in a turbulent suspension.
- Simulated the dynamics of solids in very young phases.
- Use new observations to constrain models.
- Lifted some of the degeneracy in the interpretation of observations by including new physics in the models (disk gravity, eccentricities)
- Developed an Exascale code to perform global simulations of young objects at very high resolution.
- Established connections between dust gas instabilities and topological physics.
- Developed a numerical code to compute the coagulation/fragmentation of solids extremely efficiently.
- Developed a formalism to understand the collapse of a star from a local point of view and implemented it in a numerical code.
- Developed a formalism to understand the behavior of solids in a turbulent suspension.
- Simulated the dynamics of solids in very young phases.
- Use new observations to constrain models.
- Lifted some of the degeneracy in the interpretation of observations by including new physics in the models (disk gravity, eccentricities)
- Developed an Exascale code to perform global simulations of young objects at very high resolution.
- Established connections between dust gas instabilities and topological physics.
- Master equation for aerosol evolution can now be numerically extremely efficiently, outperforming old approaches by one to several orders of magnitude. From a weak sample of the solid mass distribution (15 bins at the ~200 link) while limiting the diffusion excess. This method also allows to reduce drastically the computational costs both in time and energy. 3D numerical dust/gas simulations that include a comprehensive evolution of the solid coagulation become now feasible, addressing one of the Grand Challenges in planet formation.
- Development and tests of the SHAMROCK tree. The novel numerical tool allows to perform hydrodynamical simulations onto architectures designed for massive simulation parallelization (Exascale). Achieving quasi-linear scaling is long-standing question transverse astrophysics since the 80’s.
- We established a novel parallel between stars and topological insulators. The analysis allows to explore regimes that were not accessible analytically before. New pulsating modes have been identified and shown to be ubiquitous across the Hertzsprung-Russel diagram. This topological analysis provides a manner to treat pulsation problems in stars that is very different to the conventional approach used from decades.
- Collisionless dust in turbulent suspensions has been shown to have a pressure tensor, contrary to what have been assumed for decades in the community. Studies need to be performed to see wether the effects due to this pressure are large enough for modifying deeply our understanding of planet formation.
- So far, star formation has been studied from a global perspective. The novel analytic framework developed will allow to focus on the physical processes at small scales. The fact that the underlying metric varies with time makes the problem both simple and extremely rich. The potential for breakthrough needs to be confirmed, by showing that novel key processes of the star and planet formation process can be revealed through this framework.
- Development and tests of the SHAMROCK tree. The novel numerical tool allows to perform hydrodynamical simulations onto architectures designed for massive simulation parallelization (Exascale). Achieving quasi-linear scaling is long-standing question transverse astrophysics since the 80’s.
- We established a novel parallel between stars and topological insulators. The analysis allows to explore regimes that were not accessible analytically before. New pulsating modes have been identified and shown to be ubiquitous across the Hertzsprung-Russel diagram. This topological analysis provides a manner to treat pulsation problems in stars that is very different to the conventional approach used from decades.
- Collisionless dust in turbulent suspensions has been shown to have a pressure tensor, contrary to what have been assumed for decades in the community. Studies need to be performed to see wether the effects due to this pressure are large enough for modifying deeply our understanding of planet formation.
- So far, star formation has been studied from a global perspective. The novel analytic framework developed will allow to focus on the physical processes at small scales. The fact that the underlying metric varies with time makes the problem both simple and extremely rich. The potential for breakthrough needs to be confirmed, by showing that novel key processes of the star and planet formation process can be revealed through this framework.