97 citations · 367 across the 20 of their papers we have counts for
20 papers
Gliese 12 b: A temperate Earth-sized planet at 12 pc ideal for atmospheric transmission spectroscopy
M. Kuzuhara, A. Fukui, J. H. Livingston +103
Recent discoveries of Earth-sized planets transiting nearby M dwarfs have made it possible to characterize the atmospheres of terrestrial planets via follow-up spectroscopic observ…
Chondrule Destruction via Dust Collisions in Shock Waves
Yuji Matsumoto, Kosuke Kurosawa, Sota Arakawa
A leading candidate for the heating source of chondrules and igneous rims is shock waves. This mechanism generates high relative velocities between chondrules and dust particles. W…
Igneous Rim Accretion on Chondrules in Low-Velocity Shock Waves
Yuji Matsumoto, Sota Arakawa
Shock wave heating is a leading candidate for the mechanisms of chondrule formation. This mechanism forms chondrules when the shock velocity is in a certain range. If the shock vel…
An Earth-sized Planet around an M5 Dwarf Star at 22 pc
Teruyuki Hirano, Fei Dai, John H. Livingston +46
We report on the discovery of an Earth-sized transiting planet () in a day orbit around K2-415 (EPIC 211414619), an M5V star at 22 pc. The pla…
A Super-Earth Orbiting Near the Inner Edge of the Habitable Zone around the M4.5-dwarf Ross 508
Hiroki Harakawa, Takuya Takarada, Yui Kasagi +46
We report the near-infrared radial-velocity (RV) discovery of a super-Earth planet on a 10.77-day orbit around the M4.5 dwarf Ross 508 (). Using precision RVs f…
Size evolution of close-in super-Earths through giant impacts and photoevaporation
Yuji Matsumoto, Eiichiro Kokubo, Pin-Gao Gu +1
The Kepler transit survey with follow-up spectroscopic observations has discovered numerous super-Earth sized planets and revealed intriguing features of their sizes, orbital perio…
On the crystallinity of silicate dust in evolving protoplanetary disks due to magnetically driven disk winds
Sota Arakawa, Yuji Matsumoto, Mitsuhiko Honda
We present a novel mechanism for the outward transport of crystalline dust particles: the outward radial drift of pebbles. The dust ring structure is frequently observed in protopl…
Formation of rims around chondrules via porous aggregate accretion
Yuji Matsumoto, Yasuhiro Hasegawa, Nozomi Matsuda +1
Chondrules are often surrounded by fine-grained rims or igneous rims. The properties of these rims reflect their formation histories. While the formation of fine-grained rims is mo…
Formation of multiple-planet systems in resonant chains around M dwarfs
Yu-Chia Lin, Yuji Matsumoto, Pin-Gao Gu
Recent observations have revealed the existence of multiple-planet systems composed of Earth-mass planets around late M dwarfs. Most of their orbits are close to commensurabilities…
Ejection of close-in super-Earths around low-mass stars in the giant impact stage
Yuji Matsumoto, Pin-Gao Gu, Eiichiro Kokubo +2
Earth-sized planets were observed in close-in orbits around M dwarfs. While more and more planets are expected to be uncovered around M dwarfs, theories of their formation and dyna…
Breaking Resonant Chains: Destabilization of Resonant Planets due to Long-term Mass Evolution
Yuji Matsumoto, Masahiro Ogihara
Recent exoplanet observations reported a large number of multiple-planet systems, in which some of the planets are in a chain of resonances. The fraction of resonant systems to non…
Aggregate Growth and Internal structures of Chondrite Parent Bodies Forming from Dense Clumps
Yuji Matsumoto, Shigeru Wakita, Yasuhiro Hasegawa +1
Major components of chondrites are chondrules and matrix. Measurements of the volatile abundance in Semarkona chondrules suggest that chondrules formed in a dense clump that had a…
The Properties of Planetesimal Collisions under Jupiter's Perturbation and the Application to Chondrule Formation via Impact Jetting
Shoichi Oshino, Yasuhiro Hasegawa, Shigeru Wakita +1
Understanding chondrule formation provides invaluable clues about the origin of the solar system. Recent studies suggest that planetesimal collisions and the resulting impact melts…
Formation of Close-in Super-Earths by Giant Impacts: Effects of Initial Eccentricities and Inclinations of Protoplanets
Yuji Matsumoto, Eiichiro Kokubo
Recent observations have revealed the eccentricity and inclination distributions of close-in super-Earths. These distributions have the potential to constrain their formation proce…
Chondrule Accretion with a Growing Protoplanet
Yuji Matsumoto, Shoichi Oshino, Yasuhiro Hasegawa +1
Chondrules are primitive materials in the Solar System. They are formed in the first about 3 Myr of the Solar System's history. This timescale is longer than that of Mars formation…
Planetesimal collisions as a chondrule forming event
Shigeru Wakita, Yuji Matsumoto, Shoichi Oshino +1
Chondritic meteorites contain unique spherical materials named chondrules: sub-mm sized silicate grains once melted in a high temperature condition in the solar nebula. We numerica…
Forming Chondrites in a Solar Nebula with Magnetically Induced Turbulence
Yasuhiro Hasegawa, Neal J. Turner, Joseph Masiero +3
Chondritic meteorites provide valuable opportunities to investigate the origins of the solar system. We explore impact jetting as a mechanism of chondrule formation and subsequent…
Chondrule Formation via Impact Jetting Triggered by Planetary Accretion
Yasuhiro Hasegawa, Shigeru Wakita, Yuji Matsumoto +1
Chondrules are one of the most primitive elements that can serve as a fundamental clue as to the origin of our Solar system. We investigate a formation scenario of chondrules that…
Eccentricity Evolution Through Accretion of Protoplanets
Yuji Matsumoto, Makiko Nagasawa, Shigeru Ida
Most of super-Earths detected by the radial velocity (RV) method have significantly smaller eccentricities than the eccentricities corresponding to velocity dispersion equal to the…
The Orbital Stability of Planets Trapped in the First-Order Mean-Motion Resonances
Yuji Matsumoto, Makiko Nagasawa, Shigeru Ida
Many extrasolar planetary systems containing multiple super-Earths have been discovered. N-body simulations taking into account standard type-I planetary migration suggest that pro…