Zobrazeno 1 - 10
of 165
pro vyhledávání: '"Nakamoto, Taishi"'
Autor:
Arakawa, Sota, Yamamoto, Daiki, Ushikubo, Takayuki, Kaneko, Hiroaki, Tanaka, Hidekazu, Hirose, Shigenobu, Nakamoto, Taishi
Oxygen isotope compositions of chondrules reflect the environment of chondrule formation and its spatial and temporal variations. Here, we present a theoretical model of oxygen isotope exchange reaction between molten silicate spherules and ambient w
Externí odkaz:
http://arxiv.org/abs/2306.14413
Autor:
Arakawa, Sota, Okuzumi, Satoshi, Tatsuuma, Misako, Tanaka, Hidekazu, Kokubo, Eiichiro, Nishiura, Daisuke, Furuichi, Mikito, Nakamoto, Taishi
Understanding the collisional behavior of dust aggregates is essential in the context of planet formation. It is known that low-velocity collisions of dust aggregates result in bouncing rather than sticking when the filling factor of colliding dust a
Externí odkaz:
http://arxiv.org/abs/2306.04070
Fine-grained rims (FGRs) are frequently found around chondrules in primitive chondrites. The remarkable feature of FGRs is their submicron-sized and non-porous nature. The typical thickness of FGRs around chondrules is 10--100 $\mu$m. Recently, a nov
Externí odkaz:
http://arxiv.org/abs/2202.02683
Coarse objects in chondrites such as chondrules and CAIs are mostly coated with fine-grained rims (FGRs). FGRs can be formed on the surface of free floating chondrules in a turbulent nebula, where dust aggregation also occurs. A former study has repo
Externí odkaz:
http://arxiv.org/abs/2110.08564
We herein report a theoretical study of the geometrical structure of porous dust aggregates formed via ballistic cluster-cluster aggregation (BCCA). We calculated the gyration radius $R_{\rm gyr}$ and the graph-based geodesic radius $R_{\rm geo}$ as
Externí odkaz:
http://arxiv.org/abs/1908.03125
The poor stickiness of silicate dust grains is a major obstacle to the formation of rocky planetesimals. In this study, we examine the possibility that silicate grains with an organic mantle, which we call Organic-Mantled Grains (OMGs), form planetes
Externí odkaz:
http://arxiv.org/abs/1905.03029
Autor:
Arakawa, Sota, Nakamoto, Taishi
Shock-wave heating within the solar nebula is one of the leading candidates for the source of chondrule-forming events. Here, we examine the possibility of compound chondrule formation via optically thin shock waves. Several features of compound chon
Externí odkaz:
http://arxiv.org/abs/1904.09580
Understanding the heat transfer mechanism within dust aggregates is of great importance for many subjects in planetary science. We calculated the coordination number and the thermal conductivity through the solid network of compressed dust aggregates
Externí odkaz:
http://arxiv.org/abs/1901.09700
Autor:
Homma, Kenji, Nakamoto, Taishi
Highly porous dust aggregates can break through the radial drift barrier, but previous studies assumed disks in their later stage, where the disks have a very small mass and low temperature. In contrast, dust coagulation should begin in the very earl
Externí odkaz:
http://arxiv.org/abs/1809.06733
Autor:
Kawauchi, Kiyoe, Narita, Norio, Sato, Bun'ei, Hirano, Teruyuki, Kawashima, Yui, Nakamoto, Taishi, Yamashita, Takuya, Tamura, Motohide
We report the results of detailed investigation of the Earth's transmission spectra during the lunar eclipse on UT 2011 December 10. The spectra were taken by using the High Dispersion Spectrograph (HDS) mounted on the Subaru 8.2 m telescope with unp
Externí odkaz:
http://arxiv.org/abs/1806.09085