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Paper: Compressive Strength of Dust Aggregates Investigated by Numerical Simulations and its Formulation (Aug. 9, 2023)

Planets are thought to form through the accumulation of micron-sized dust grains. Once they become kilometer-sized, they are called planetesimals, and the formation process of planetesimals remains unknown. To unravel it, observations and explorations of comets and asteroids in our solar system, which are considered to be remnants of planetesimals, have been conducted. The internal structure of these bodies, such as comets and asteroids, is determined by the balance between the strength of their constituting materials and the self-gravity of the bodies. In this paper, to investigate the formation process of planetesimals based on the physical properties of comets and asteroids, we calculated and formulated the compressive strength of dust aggregates in the intermediate stages of planetesimal formation through numerical simulations. As a result, we found that incorporating an excluded volume, a non-compressible volume that accounts for the volume of the constituent particles and the void volume at the closest packing, significantly enhances the accuracy of reproducing the numerical simulation results.
Tatsuuma et al. 2023, ApJ, 953, 6

Award: honourable mention for the 2022 IAU PhD Prize (Jun. 22, 2023)

I got an honourable mention for the 2022 International Astronomical Union (IAU) PhD Prize.
The title of my dissertation is “Material Strength of Dust Aggregates in Planet Formation.”
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Award: 2021 School of Science Research Encouragement Award, The University of Tokyo (Mar. 25, 2022)

I got the 2021 School of Science Research Encouragement Award, The University of Tokyo.
The title of my dissertation is “Material Strength of Dust Aggregates in Planet Formation.”
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Award: Oral Award at the 50th Summer School on Astronomy and Astrophysics (Sep. 15, 2020)

I got the third prize of the Oral Award at the 50th Summer School on Astronomy and Astrophysics.
The title is “Rotational Disruption of Porous Dust Aggregates due to Gas Flow in Protoplanetary Disks.”
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Award: JpGU 2019 Outstanding Student Presentation Award (Jul. 11, 2019)

I got the JpGU 2019 Outstanding Student Presentation Award.
The title is “Tensile Strength of Porous Dust Aggregates Measured with Dust N-body Simulations.”
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Paper: Tensile Strength of Dust Aggregates Investigated by Numerical Simulations (Apr. 2, 2019)

Planets are thought to form through the accumulation of micron-sized dust grains. Once they become kilometer-sized, they are called planetesimals, and the formation process of planetesimals remains unknown. To unravel it, explorations of comets and asteroids in our solar system, which are considered to be remnants of planetesimals, have been conducted (e.g., Rosetta and Hayabusa2). As a result, even the physical properties, such as tensile strength, of comets and asteroids have been revealed. In this paper, to investigate the formation process of planetesimals by using the tensile strength of comets, we calculated the tensile strength of dust aggregates in the intermediate stages of planetesimal formation through numerical simulations.
Tatsuuma et al. 2019, ApJ, 874, 159