109 citations · 555 across the 14 of their papers we have counts for
12 papers · 1 filter
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…
Determination of the branching ratio of CHOH + OH reaction on water ice surface at 10 K
Atsuki Ishibashi, Hiroshi Hidaka, W. M. C. Sameera +2
The CHO and CHOH radicals can be important precursors of complex organic molecules (COMs) in interstellar dust. The COMs presumably originating from these radicals were abu…
Hot methanol in the [BHB2007] 11 protobinary system: hot corino versus shock origin? : FAUST V
C. Vastel, F. Alves, C. Ceccarelli +63
Methanol is a ubiquitous species commonly found in the molecular interstellar medium. It is also a crucial seed species for the building-up of the chemical complexity in star formi…
Diffusion activation energy and desorption activation energy for astrochemically relevant species on water ice show no clear relation
Kenji Furuya, Tetsuya Hama, Yasuhiro Oba +3
The activation energy for desorption (Edes) and that for surface diffusion (Esd) of adsorbed molecules on dust grains are two of the most important parameters for the chemistry in…
Hydrogen abstraction reactions in formic and thioformic acid isomers by hydrogen and deuterium atoms. Insights on isomerism and deuteration
Germán Molpeceres, Izaskun Jiménez-Serra, Yasuhiro Oba +6
The isomerism of molecules in the interstellar medium and the mechanisms behind it are essential questions in the chemistry of organic molecules in space. In particular, for the si…
FAUST III. Misaligned rotations of the envelope, outflow, and disks in the multiple protostellar system of VLA 16232417
Satoshi Ohashi, Claudio Codella, Nami Sakai +69
We report a study of the low-mass Class-0 multiple system VLA 1623AB in the Ophiuchus star-forming region, using HCO (), CS (), and CCH () lines as…
Quantifying the chemical desorption of HS and PH from amorphous water ice surfaces
Kenji Furuya, Yasuhiro Oba, Takashi Shimonishi
Nonthermal desorption of molecules from icy grain surfaces is required to explain molecular line observations in the cold gas of star-forming regions. Chemical desorption is one of…
Efficient formation pathway of methyl formate: the role of OH radicals on ice dust
A. Ishibashi, H. Hidaka, Y. Oba +2
Three structural isomers of the C2H4O2 molecule, namely, methyl formate (MF; HCOOCH3), acetic acid (AA; CH3COOH), and glycol aldehyde (GA; HOCH2CHO), have attracted considerable at…
Transmission Electron Microscopy Study of the Morphology of Ices Composed of H2O, CO2, and CO on Refractory Grains
Akira Kouchi, Masashi Tsuge, Tetsuya Hama +15
It has been implicitly assumed that ices on grains in molecular clouds and proto planetary disks are formed by homogeneous layers regardless of their composition or crystallinity.…
Successive H-atom addition to solid OCS on compact amorphous solid water
Thanh Nguyen, Yasuhiro Oba, W. M. C. Sameera +2
Carbonyl sulfide (OCS) is an abundant sulfur (S)-bearing species in the interstellar medium. It is present not only in the gas phase, but also on interstellar grains as a solid; th…
An infrared measurement of chemical desorption from interstellar ice analogues
Y. Oba, T. Tomaru, T. Lamberts +2
In molecular clouds at temperatures as low as 10 K, all species except hydrogen and helium should be locked in the heterogeneous ice on dust grain surfaces. Nevertheless, astronomi…
Water Formation through a Quantum Tunneling Surface Reaction, OH + H2, at 10 K
Y. Oba, N. Watanabe, T. Hama +3
The present study experimentally demonstrated that solid H2O is formed through the surface reaction OH + H2 at 10 K. This is the first experimental evidence of solid H2O formation…