119 citations · 620 across the 21 of their papers we have counts for
21 papers
GREX-PLUS Science Book
PLUS Science Team, Akio K. Inoue, Yuichi Harikane +28
GREX-PLUS (Galaxy Reionization EXplorer and PLanetary Universe Spectrometer) is a mission candidate for a JAXA's strategic L-class mission to be launched in the 2030s. Its primary…
Spin of protoplanets generated by pebble accretion: Influences of protoplanet-induced gas flow
Kohsuke Takaoka, Ayumu Kuwahara, Shigeru Ida +1
We investigate the spin state of a protoplanet during the pebble accretion influenced by the gas flow in the gravitational potential of the protoplanet and how it depends on the pl…
Dust ring and gap formation by gas flow induced by low-mass planets embedded in protoplanetary disks . Steady-state model
Ayumu Kuwahara, Hiroyuki Kurokawa, Takayuki Tanigawa +1
Recent high-spatial-resolution observations have revealed dust substructures in protoplanetary disks such as rings and gaps, which do not always correlate with gas. Because radial…
The origin of Earth's mantle nitrogen: primordial or early biogeochemical cycling?
H. Kurokawa, M. Laneuville, Y. Li +5
Earth's mantle nitrogen (N) content is comparable to that found in its N-rich atmosphere. Mantle N has been proposed to be primordial or sourced by later subduction, yet its origin…
Distant formation and differentiation of outer main belt asteroids and carbonaceous chondrite parent bodies
H. Kurokawa, T. Shibuya, Y. Sekine +4
Volatile compositions of asteroids provide information on the Solar System history and the origins of Earth's volatiles. Visible to near-infrared observations at wavelengths of $<2…
Numerous chondritic impactors and oxidized magma ocean set Earth's volatile depletion
Haruka Sakuraba, Hiroyuki Kurokawa, Hidenori Genda +1
Earth's surface environment is largely influenced by its budget of major volatile elements: carbon (C), nitrogen (N), and hydrogen (H). Although the volatiles on Earth are thought…
Can we constrain the origin of Mars' recurring slope lineae using atmospheric observations?
H. Kurokawa, T. Kuroda, S. Aoki +1
Flowing water and brine have been proposed to cause seasonally reappearing dark streaks called recurring slope lineae (RSL) on steep warm slopes on Mars, along with other formation…
Mars' atmospheric neon suggests volatile-rich primitive mantle
H. Kurokawa, Y. N. Miura, S. Sugita +4
Martian atmospheric neon (Ne) has been detected by Viking and also found as trapped gas in Martian meteorites, though its abundance and isotopic composition have not been well dete…
Loss and fractionation of noble gas isotopes and moderately volatile elements from planetary embryos and early Venus, Earth and Mars
H. Lammer, M. Scherf, H. Kurokawa +12
Here we discuss the current state of knowledge on how atmospheric escape processes can fractionate noble gas isotopes and moderately volatile rock-forming elements that populate pr…
A probabilistic approach to determination of Ceres' average surface composition from Dawn VIR and GRaND data
H. Kurokawa, B. L. Ehlmann, M. C. De Sanctis +6
The Visible-Infrared Mapping Spectrometer (VIR) on board the Dawn spacecraft revealed that aqueous secondary minerals -- Mg-phyllosilicates, NH4-bearing phases, and Mg/Ca carbonate…
Influences of protoplanet-induced three-dimensional gas flow on pebble accretion . Headwind regime
Ayumu Kuwahara, Hiroyuki Kurokawa
Pebble accretion is one of the major theories in planet formation. Aerodynamically small particles, called pebbles, are highly affected by the gas flow. A growing planet embedded i…
Influences of three-dimensional gas flow induced by protoplanets on pebble accretion --. shear regime
Ayumu Kuwahara, Hiroyuki Kurokawa
The pebble accretion model has the potential to explain the formation of various types of planets. A growing planet embedded in a disk induces three-dimensional (3D) gas flow, whic…
Gas flow around a planet embedded in a protoplanetary disc: the dependence on the planetary mass
Ayumu Kuwahara, Hiroyuki Kurokawa, Shigeru Ida
The three-dimensional structure of the gas flow around a planet is thought to influence the accretion of both gas and solid materials. In particular, the outflow in the mid-plane r…
Subduction and atmospheric escape of Earth's seawater constrained by hydrogen isotopes
Hiroyuki Kurokawa, Julien Foriel, Matthieu Laneuville +2
The hydrogen isotopic (D/H) ratio reflects the global cycling and evolution of water on Earth as it fractionates through planetary processes. We model the water cycle taking seaflo…
Suppression of atmospheric recycling of planets embedded in a protoplanetary disc by buoyancy barrier
Hiroyuki Kurokawa, Takayuki Tanigawa
The ubiquity of super-Earths poses a problem for planet formation theory to explain how they avoided becoming gas giants. Rapid recycling of the envelope gas of planets embedded in…
Impact degassing and atmospheric erosion on Venus, Earth, and Mars during the late accretion
Haruka Sakuraba, Hiroyuki Kurokawa, Hidenori Genda
The atmospheres of the terrestrial planets are known to have been modified as a consequence of the impact degassing and atmospheric erosion during the late accretion. Despite the c…
A Lower Limit of Atmospheric Pressure on Early Mars Inferred from Nitrogen and Argon Isotopic Compositions
Hiroyuki Kurokawa, Kosuke Kurosawa, Tomohiro Usui
We examine the history of the loss and replenishment of the Martian atmosphere using elemental and isotopic compositions of nitrogen and noble gases. The evolution of the atmospher…
Interactive Evolution of Multiple Water-Ice Reservoirs on Mars: Insights from Hydrogen Isotope Compositions
Hiroyuki Kurokawa, Tomohiro Usui, Masahiko Sato
Remote sensing data from orbiter missions have proposed that ground ice may currently exist on Mars, although the volume is still uncertain. Recent analyses of Martian meteorites h…
On the Radius Anomaly of Hot Jupiters: Reexamination of the Possibility and Impact of Layered Convection
Hiroyuki Kurokawa, Shu-ichiro Inutsuka
Observations have revealed that a significant number of hot Jupiters have anomalously large radii. Layered convection induced by compositional inhomogeneity has been proposed to ac…
Evolution of Water Reservoirs on Mars: Constraints from Hydrogen Isotopes in Martian Meteorites
Hiroyuki Kurokawa, Masahiko Sato, Masashi Ushioda +4
Martian surface morphology implies that Mars was once warm enough to maintain persistent liquid water on its surface. While the high D/H ratios (~6 times the Earth's ocean water) o…
Atmospheric mass loss and evolution of short-period exoplanets: the examples of CoRoT-7b and Kepler-10b
Hiroyuki Kurokawa, Lisa Kaltenegger
Short-period exoplanets potentially lose envelope masses during their evolution because of atmospheric escape caused by the intense XUV radiation from their host stars. We develop…