133 citations · 954 across the 35 of their papers we have counts for
21 papers · 1 filter
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. 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…
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…
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…
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…
Nonsticky Ice at the Origin of the Uniformly Polarized Submillimeter Emission from the HL Tau Disk
Satoshi Okuzumi, Ryo Tazaki
Recent (sub)millimeter polarimetric observations toward the young star HL Tau have successfully detected polarization emission from its circumstellar disk. The polarization pattern…
Millimeter-wave polarization due to grain alignment by the gas flow in protoplanetary disks
Akimasa Kataoka, Satoshi Okuzumi, Ryo Tazaki
Dust grains emit intrinsic polarized emission if they are elongated and aligned in the same direction. The direction of the grain alignment is determined by external forces, such a…
Effect of dust size and structure on scattered light images of protoplanetary discs
Ryo Tazaki, Hidekazu Tanaka, Takayuki Muto +2
We study scattered light properties of protoplanetary discs at near-infrared wavelengths for various dust size and structure by performing radiative transfer simulations. We show t…
Light Scattering by Fractal Dust Aggregates. II. Opacity and Asymmetry Parameter
Ryo Tazaki, Hidekazu Tanaka
Optical properties of dust aggregates are important at various astrophysical environments. To find a reliable approximation method for optical properties of dust aggregates, we cal…
Radiative grain alignment in protoplanetary disks: Implications for polarimetric observations
Ryo Tazaki, Alexandre Lazarian, Hideko Nomura
We apply the theory of radiative torque (RAT) alignment for studying protoplanetary disks around a T-Tauri star and perform 3D radiative transfer calculations to provide the expect…
Light scattering by fractal dust aggregates: I. Angular dependence of scattering
Ryo Tazaki, Hidekazu Tanaka, Satoshi Okuzumi +2
In protoplanetary disks, micron-sized dust grains coagulate to form highly porous dust aggregates. Because the optical properties of these aggregates are not completely understood,…
Outward Motion of Porous Dust Aggregates by Stellar Radiation Pressure in Protoplanetary Disks
Ryo Tazaki, Hideko Nomura
We study the dust motion at the surface layer of protoplanetary disks. Dust grains in surface layer migrate outward due to angular momentum transport via gas-drag force induced by…