133 citations · 954 across the 35 of their papers we have counts for
35 papers
JWST Imaging of Edge-on Protoplanetary Disks. V. Flux Ratio Reversal and Disk-edge Structure in the Flying Saucer
Jie Ma, Karl R. Stapelfeldt, Marion Villenave +8
We present near- and mid-infrared broadband imaging observations of the edge-on protoplanetary disk 2MASS J16281370-2431391, a.k.a. the 'Flying Saucer', obtained with NIRCam and MI…
The dust in Sauron's eye - Observational and experimental results on the debris disk around HR 4796
M. Bonduelle, J. Milli, O. Poch +14
The optical properties (scattering phase function SPF; degree of linear polarization DoLP; reflectance) of the dust particles orbiting in debris disks can be retrieved through scat…
JWST imaging of edge-on protoplanetary disks II. Appearance of edge-on disks with a tilted inner region: case study of IRAS04302+2247
M. Villenave, K. R. Stapelfeldt, G. Duchene +6
We present JWST imaging from 2m to 21m of the edge-on protoplanetary disk around the embedded young star IRAS04302+2247. The structure of the source shows two reflection nebu…
JWST imaging of edge-on protoplanetary disks. I. Fully vertically mixed 10m grains in the outer regions of a 1000 au disk
G. Duchene, F. Menard, K. Stapelfeldt +6
Scattered light imaging of protoplanetary disks provides key insights on the geometry and dust properties in the disk surface. Here we present JWST 2--21\,m images of a 1000\,au…
Revealing magnetic field structure at the surfaces of protoplanetary disks via near-infrared circular polarization
Ilse de Langen, Ryo Tazaki
Context. Magnetic fields play a fundamental role in the dynamical evolution of protoplanetary disks, in particular via magnetically induced disk winds. The magnetic field structure…
Fractal aggregates of sub-micron-sized grains in the young planet-forming disk around IM Lup
Ryo Tazaki, Christian Ginski, Carsten Dominik
Despite rapidly growing disk observations, it remains a mystery what primordial dust aggregates look like and what the physical and chemical properties of their constituent grains…
Observed polarized scattered light phase functions of planet-forming disks
Christian Ginski, Ryo Tazaki, Carsten Dominik +1
Dust particles are the building blocks from which planetary bodies are made. A major goal of the studies of planet-forming disks is to constrain the properties of dust particles an…
How large are the monomers of dust aggregates in planet-forming disks?: Insights from quantitative optical and near-infrared polarimetry
Ryo Tazaki, Carsten Dominik
Context: The size of the constituent particles (monomers) of dust aggregates is one of the most uncertain parameters directly affecting collisional growth of aggregates in planet-f…
The water-ice feature in near-infrared disk-scattered light around HD 142527: Micron-sized icy grains lifted up to the disk surface?
Ryo Tazaki, Koji Murakawa, Takayuki Muto +2
We study the m scattering feature of water ice detected in the outer disk of HD 142527 by performing radiative transfer simulations. We show that an ice mass abundance at the…
The formation of planetary systems with SPICA
I. Kamp, M. Honda, H. Nomura +38
In this era of spatially resolved observations of planet forming disks with ALMA and large ground-based telescopes such as the VLT, Keck and Subaru, we still lack statistically rel…
Analytic expressions for geometric cross-sections of fractal dust aggregates
Ryo Tazaki
In protoplanetary discs and planetary atmospheres, dust grains coagulate to form fractal dust aggregates. The geometric cross-section of these aggregates is a crucial parameter cha…
Scattering polarization of 3-m water-ice feature by large icy grains
Ryo Tazaki, Koji Murakawa, Takayuki Muto +2
Water ice has a strong spectral feature at a wavelength of approximately m, which plays a vital role in our understanding of the icy universe. In this study, we investigate th…
Haze Formation on Triton
Kazumasa Ohno, Xi Zhang, Ryo Tazaki +1
The largest moon of Neptune, Triton, possess a cold and hazy atmosphere. Since the discovery of near-surface haze layer during the Voyager fly in 1989, the haze formation mechanism…
Distortion of Magnetic Fields in the Dense Core SL42 (CrA-E) in the Corona Australis Molecular Cloud Complex
Ryo Kandori, Motohide Tamura, Masao Saito +9
Detailed magnetic field structure of the dense core SL42 (CrA-E) in the Corona Australis molecular cloud complex was investigated based on near-infrared polarimetric observations o…
SCExAO/CHARIS High-Contrast Imaging of Spirals and Darkening Features in the HD 34700 A Protoplanetary Disk
Taichi Uyama, Thayne Currie, Valentin Christiaens +27
We present Subaru/SCExAO+CHARIS broadband (-band) integral field spectroscopy of HD 34700 A. CHARIS data recover HD 34700 A's disk ring and confirm multiple spirals discovered…
Distortion of Magnetic Fields in BHR 71
Ryo Kandori, Motohide Tamura, Masao Saito +9
The magnetic field structure of a star-forming Bok globule BHR 71 was determined based on near-infrared polarimetric observations of background stars. The magnetic field in BHR 71…
Dust Destruction by Charging: A Possible Origin of Grey Extinction Curves of Active Galactic Nuclei
Ryo Tazaki, Kohei Ichikawa, Mitsuru Kokubo
Observed extinction curves of active galactic nuclei (AGNs) are significantly different from those observed in the Milky Way. The observations require preferential removal of small…
Dust Destruction by Drift-Induced Sputtering in Active Galactic Nuclei
Ryo Tazaki, Kohei Ichikawa
Recent mid-infrared high spatial resolution observations have revealed that active galactic nuclei (AGNs) may host a polar dust region with the size of several pc, and such dust ma…
Distortion of Magnetic Fields in Barnard 335
Ryo Kandori, Masao Saito, Motohide Tamura +9
In this study, the detailed magnetic field structure of the dense protostellar core Barnard 335 (B335) was revealed based on near-infrared polarimetric observations of background s…
Distortion of Magnetic Fields in the Dense Core CB81 (L1774, Pipe 42) in the Pipe Nebula
Ryo Kandori, Motohide Tamura, Masao Saito +9
The detailed magnetic field structure of the starless dense core CB81 (L1774, Pipe 42) in the Pipe Nebula was determined based on near-infrared polarimetric observations of backgro…
Distortion of Magnetic Fields in a Starless Core VI: Application of Flux Freezing Model and Core Formation of FeSt 1-457
Ryo Kandori, Kohji Tomisaka, Masao Saito +9
Observational data for the hourglass-like magnetic field toward the starless dense core FeSt 1-457 were compared with a flux freezing magnetic field model (Myers et al. 2018). Fitt…
Distortion of Magnetic Fields in Barnard 68
Ryo Kandori, Motohide Tamura, Masao Saito +8
The magnetic field structure, kinematical stability, and evolutionary status of the starless dense core Barnard 68 (B68) are revealed based on the near-infrared polarimetric observ…
Clouds of Fluffy Aggregates: How They Form in Exoplanetary Atmospheres and Influence Transmission Spectra
Kazumasa Ohno, Satoshi Okuzumi, Ryo Tazaki
Transmission spectrum surveys have suggested the ubiquity of high-altitude clouds in exoplanetary atmospheres. Theoretical studies have investigated the formation processes of the…
Unveiling Dust Aggregate Structure in Protoplanetary Disks by Millimeter-wave Scattering Polarization
Ryo Tazaki, Hidekazu Tanaka, Akimasa Kataoka +2
Dust coagulation in a protoplanetary disk is the first step of planetesimal formation. However, a pathway from dust aggregates to planetesimals remains unclear. Both numerical simu…