42 citations · 70 across the 14 of their papers we have counts for
15 papers
Thermally irreversible sulfur chemisorption on silicate grains as a major sulfur reservoir in molecular clouds
Ni-En Sie, Masashi Tsuge, Yasuhiro Oba +3
Sulfur (S) chemistry in the interstellar medium remains poorly constrained due to the longstanding "missing sulfur" problem, where a significant fraction of cosmic sulfur in molecu…
Gas phase Elemental abundances in Molecular cloudS (GEMS) XII. First look into the para-to-ortho ratio of c-C3D2 towards prestellar cores
J. Ferrer Asensio, A. Fuente, E. Roueff +3
Symmetric molecules with identical nuclei form distinct nuclear spin isomers (ortho and para) that cannot interconvert via radiative or inelastic transitions, preserving clues abou…
Compact Hydrogen Sulfide Emission Indicates Sulfur-bearing Ice Sublimation in the Inner Disk of HD 163296
Yoshihide Yamato, Yuri Aikawa, Kenji Furuya +8
The sulfur chemistry in protoplanetary disks directly affects the composition and potential habitability of nascent planets, but its volatile inventory remains highly uncertain. He…
H Ortho-Para Spin Conversion on Inhomogeneous Grain Surfaces. II. impact of the rotational energy difference between adsorbed ortho-H and para-H and implication to deuterium fractionation chemistry
Kenji Furuya, Toshiki Sugimoto, Kazunari Iwasaki +2
We investigate how the H ortho-to-para ratio (OPR) and dueterium fractionation in star-forming regions are affected by nuclear spin conversion (NSC) on dust grains. Particular…
Atom Addition Formation of Thionylimide (HNSO) on Interstellar Dust Grains: Chemical routes requiring oxygen and nitrogen atom surface diffusion
Juan Carlos del Valle, Miguel Sanz-Novo, Johannes Kästner +4
We investigate the formation of the recently detected HNSO molecule using quantum chemical calculations on ices and astrochemical models in tandem. Our results indicate that HNSO i…
Time-dependent chemical evolution during cloud formation: H-regulated chemistry in diffuse molecular cloud
Yuto Komichi, Yuri Aikawa, Kazunari Iwasaki +1
We investigate the chemical evolution of a forming molecular cloud behind an interstellar shock wave. We conduct three-dimensional magnetohydrodynamics simulations of the convergin…
Formation of unsaturated carbon chains through carbon chemisorption on solid CO
Masashi Tsuge, Germán Molpeceres, Ryota Ichimura +3
The interaction of carbon atoms with solid carbon monoxide (CO) is a fundamental process in astrochemistry, influencing the formation of complex organic molecules in interstellar e…
Extended and Compact Ortho-HD Structures Close to the Moment of Star-Formation: Evidence from ALMA-ACA Observations in Taurus
Kazuki Tokuda, Kenji Furuya, Naofumi Fukaya +8
Observing and characterizing pre- and protostellar cores in the earliest and densest stages of star formation is challenging due to their short timescales and high densities, limit…
Digging into the Interior of Hot Cores with ALMA (DIHCA). V. Deuterium Fractionation of Methanol
Takeshi Sakai, Nobuhito Shiomura, Patricio Sanhueza +16
We have observed the CHOH A, CHOH A, and CHDOH lines toward 24 high-mass star-forming regions by usi…
Chemical Evolution during Molecular Cloud Formation Triggered by an Interstellar Shock Wave: Dependence on Shock Parameters and Comparison with Molecular Absorption Lines
Yuto Komichi, Yuri Aikawa, Kazunari Iwasaki +1
We investigate chemistry in the compression layer behind the interstellar shock waves, where molecular cloud formation starts. We perform three-dimensional magnetohydrodynamics sim…
Chemical pathways of SO2 with hydrogen atoms on interstellar ice analogues
Thanh Nguyen, Yasuhiro Oba, W. M. C. Sameera +2
Sulfur dioxide (SO2) is a sulfur-containing molecule expected to exist as a solid in the interstellar medium (ISM). In this study, we performed laboratory experiments and computati…
Detection of Dimethyl Ether in the Central Region of the MWC 480 Protoplanetary Disk
Yoshihide Yamato, Yuri Aikawa, Viviana V. Guzmán +9
Characterizing the chemistry of complex organic molecules (COMs) at the epoch of planet formation provides insights into the chemical evolution of the interstellar medium (ISM) and…
Chemical Evolution of Complex Organic Molecules in Turbulent Protoplanetary Disks: Effect of stochastic UV irradiation
Taiki Suzuki, Kenji Furuya, Yuri Aikawa +2
We investigate the chemical evolution of complex organic molecules (COMs) in turbulent disks using gas-ice chemical reaction network simulations. We trace trajectories of dust part…
Enhanced formation of interstellar complex organic molecules on carbon monoxide ice
Germán Molpeceres, Kenji Furuya, Yuri Aikawa
We investigate the role of carbon monoxide ice in the chemical evolution of prestellar cores using astrochemical rate equation models. We constrain the ratios of the binding energi…
DNC/HNC and N2D+/N2H+ ratios in high-mass star forming cores
F. Fontani, T. Sakai, K. Furuya +3
Chemical models predict that the deuterated fraction (the column density ratio between a molecule containing D and its counterpart containing H) of N2H+, Dfrac(N2H+), is high in ma…