141 citations · 2k across the 55 of their papers we have counts for
24 papers · 1 filter
An Adjoint Projection Formulation for Enforcing the divergence-free Constraint in Smoothed Particle Magnetohydrodynamics
Yusuke Tsukamoto
We present a projection method for controlling numerical \(\nabla\cdot\B\) errors in smoothed particle magnetohydrodynamics (SPMHD). The method corrects the magnetic field after an…
Co-evolution of dust grains and protoplanetary disks II: structure and evolution of protoplanetary disks; an analytical approach
Yusuke Tsukamoto
In our previous study (Tsukamoto {\it et al.} 2023), we investigated formation and early evolution of protoplanetary disks with 3D non-ideal magnetohydrodynamics simulations consid…
Filamentary Network and Magnetic Field Structures Revealed with BISTRO in the High-Mass Star-Forming Region NGC2264 : Global Properties and Local Magnetogravitational Configurations
Jia-Wei Wang, Patrick M. Koch, Seamus D. Clarke +154
We report 850 m continuum polarization observations toward the filamentary high-mass star-forming region NGC 2264, taken as part of the B-fields In STar forming Regions Observat…
Co-evolution of dust grains and protoplanetary disks
Yusuke Tsukamoto, Masahiro N. Machida, Shu-ichiro Inutsuka
We propose a new evolutionary process of protoplanetary disks "co-evolution of dust grains and protoplanetary disks", revealed by dust-gas two-fluid non-ideal magnetohydrodynamics…
The role of magnetic fields in the formation of protostars, disks, and outflows
Yusuke Tsukamoto, Anaëlle Maury, Benoît Commerçon +6
We present our current understanding of the formation and early evolution of protostars, protoplanetary disks, and the driving of outflows as dictated by the interplay of magnetic…
Impact of dust size distribution including large dust grains on magnetic resistivity: an analytical approach
Yusuke Tsukamoto, Satoshi Okuzumi
This paper investigates the impact of dust size distribution on magnetic resistivity. In particular, we focus on its impact when the maximum dust size significantly increases from…
"Ash-fall" induced by molecular outflow in protostar evolution
Yusuke Tsukamoto, Masahiro N. Machida, Shu-ichiro Inutsuka
Dust growth and its associated dynamics play key roles in the first phase of planet formation in young stellar objects (YSOs). Observations have detected signs of dust growth in ve…
Misaligned Circumstellar Disks and Orbital Motion of the Young Binary XZ Tau
Takanori Ichikawa, Miyu Kido, Daisuke Takaishi +3
We report our analyses of the multi-epoch (2015-2017) ALMA archival data of the Class II binary system XZ Tau at Bands 3, 4 and 6. The millimeter dust continuum images show compact…
Early evolution of disk, outflow, and magnetic field of young stellar objects: Impact of dust model
Y. Tsukamoto, M. N. Machida, H. Susa +2
The formation and early evolution of low mass young stellar objects (YSOs) are investigated using three-dimensional non-ideal magneto-hydrodynamics simulations. We investigate the…
The Effect of Misalignment between Rotation Axis and Magnetic Field on Circumstellar Disk
Shingo Hirano, Yusuke Tsukamoto, Shantanu Basu +1
The formation of circumstellar disks is investigated using three-dimensional resistive magnetohydrodynamic simulations, in which the initial prestellar cloud has a misaligned rotat…
Dependence of Hall Coefficient on Grain Size and Cosmic Ray Rate and Implication for Circumstellar Disk Formation
Shunta Koga, Yusuke Tsukamoto, Satoshi Okuzumi +1
The Hall effect plays a significant role in star formation because it induces rotation in the infalling envelope, which in turn affects the formation and evolution of the circumste…
Does misalignment between magnetic field and angular momentum enhance or suppress circumstellar disk formation?
Y. Tsukamoto, S. Okuzumi, K. Iwasaki +2
The effect of misalignment between the magnetic field $\magB$ and the angular momentum $\Jang$ of molecular cloud cores on the angular momentum evolution during the gravitational c…
The impact of the Hall effect during cloud core collapse:implications for circumstellar disk evolution
Yusuke Tsukamoto, Satoshi Okuzumi, Kazunari Iwasaki +2
We perform three-dimensional radiation non-ideal magnetohydrodynamics simulations and investigate the impact of the Hall effect on the angular momentum evolution in the collapsing…
Chemistry in a forming protoplanetary disk: main accretion phase
Haruaki Yoneda, Yusuke Tsukamoto, Kenji Furuya +1
We investigate the chemistry in a radiation-hydrodynamics model of star-forming core which evolves from a cold ( K) prestellar core to the main accretion phase in $\sim 10…
Apparent disk-mass reduction and planetesimal formation in gravitationally unstable disks in Class 0/I YSOs
Y. Tsukamoto, S. Okuzumi, A. Kataoka
We investigate the dust structure of gravitationally unstable disks undergoing mass accretion from the envelope envisioning the application to Class 0/I young stellar objects (YSOs…
A revised condition for self-gravitational fragmentation of protoplanetary disks
Sanemichi Z. Takahashi, Yusuke Tsukamoto, Shu-ichiro Inutsuka
Fragmentation of protoplanetary disks due to gravitational instabilities is a candidate of a formation mechanism of binary stars, brown dwarfs, and gaseous giant planets. The condi…
Magnetic field and early evolution of circumstellar disks
Yusuke Tsukamoto
The magnetic field plays a central role in the formation and evolution of circumstellar disks. The magnetic field connects the rapidly rotating central region with the outer envelo…
Bimodality of circumstellar disk evolution induced by Hall current
Y. Tsukamoto, K. Iwasaki, S. Okuzumi +2
The formation process of circumstellar disks is still controversial because of the interplay of complex physical processes that occurs during the gravitational collapse of prestell…
Effects of Ohmic and ambipolar diffusion on the formation and evolution of the first cores, protostars and circumstellar discs
Yusuke Tsukamoto, Kazunari Iwasaki, Satoshi Okuzumi +2
We investigate the formation and evolution of a first core, protostar, and circumstellar disc with a three-dimensional non-ideal (including both Ohmic and ambipolar diffusion) radi…
Effects of radiation transfer on the structure of self-gravitating disks, their fragmentation and evolution of the fragments
Yusuke Tsukamoto, Sanemichi Z. Takahashi, Masahiro N. Machida +1
We investigate structure of self-gravitating disks, their fragmentation and evolution of the fragments (the clumps) using both analytic approach and three-dimensional radiation hyd…
Formation, orbital and thermal evolution, and survival of planetary-mass clumps in the early phase of circumstellar disk evolution
Yusuke Tsukamoto, Masahiro N. Machida, Shuichiro Inutsuka
We report the results of our three-dimensional radiation hydrodynamics simulation of collapsing unmagnetized molecular cloud cores. We investigate the formation and evolution of th…
An explicit scheme for ohmic dissipation with smoothed particle magneto-hydrodynamics
Yusuke Tsukamoto, Kazunari Iwasaki, Shu-ichiro Inutsuka
In this paper, we present an explicit scheme for Ohmic dissipation with smoothed particle magneto-hydrodynamics (SPMHD). We propose a SPH discretization of Ohmic dissipation and so…
Formation and Early Evolution of Circumstellar Disks in Turbulent Molecular Cloud Cores
Yusuke Tsukamoto, Masahiro N. Machida
We investigate the formation and evolution of circumstellar disks in turbulent cloud cores until several 104 years after protostar formation using smoothed particle hydrodynamics (…
Classification of the Circumstellar Disk Evolution During the Main Accretion Phase
Yusuke Tsukamoto, Masahiro N. Machida
We have carried out hydro-dynamical simulations to investigate the formation and evolution of protostar and circumstellar disks from the prestellar cloud. As the initial state, we…