194 citations · 1.3k across the 29 of their papers we have counts for
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GW Ori: Interactions Between a Triple-star System and its Circumtriple Disk in Action
Jiaqing Bi, Nienke van der Marel, Ruobing Dong +17
GW Ori is a hierarchical triple system which has a rare circumtriple disk. We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of 1.3 mm dust continuum and…
Discovery of an au-scale excess in millimeter emission from the protoplanetary disk around TW Hya
Takashi Tsukagoshi, Takayuki Muto, Hideko Nomura +10
We report the detection of an excess in dust continuum emission at 233~GHz (1.3~mm in wavelength) in the protoplanetary disk around TW~Hya revealed through high-sensitivity observa…
Structure Formation in a Young Protoplanetary Disk by a Magnetic Disk Wind
Sanemichi Z. Takahashi, Takayuki Muto
Structure formation in young protoplanetary disks is investigated using a one-dimensional model including the formation and the evolution of disks. Recent observations with ALMA fo…
Primordial protostars accreting beyond the -limit: radiation effect around the star-disk boundary
Sanemichi Z. Takahashi, Kazuyuki Omukai
We consider whether the maximum mass of first stars is imposed by the protostellar spin, i.e., by the so-called -limit, which requires the sum of the radiation and centrifugal…
From Birth to Death of Protoplanetary Disks: Modeling Their Formation, Evolution, and Dispersal
Shigeo S. Kimura, Masanobu Kunitomo, Sanemichi Z. Takahashi
Formation, evolution, and dispersal processes of protoplanetary disks are investigated and the disk lifetime is estimated. Gravitational collapse of a pre-stellar core forms both a…
An Origin of Multiple Ring Structure and Hidden Planets in HL Tau: A Unified Picture by Secular Gravitational Instability
Sanemichi Z. Takahashi, Shu-ichiro Inutsuka
Recent ALMA observation has revealed multiple ring structures formed in a protoplanetary disk around HL Tau. Prior to the ALMA observation of HL Tau, theoretical analysis of secula…
The Origin of the Rotation Profiles in Star Forming Clouds
Sanemichi Z. Takahashi, Kengo Tomida, Masahiro N. Machida +1
Angular momentum distribution and its redistribution are of crucial importance in formation and evolution of circumstellar disks. Many molecular line observations toward young stel…
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…
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…
Local Enhancement of Surface Density in the Protoplanetary Ring Surrounding HD 142527
Misato Fukagawa, Takashi Tsukagoshi, Munetake Momose +15
We report ALMA observations of dust continuum, 13CO J=3--2, and C18O J=3--2 line emission toward a gapped protoplanetary disk around HD 142527. The outer horseshoe-shaped disk show…
A Semi-Analytical Description for the Formation and Gravitational Evolution of Protoplanetary Disks
Sanemichi Z. Takahashi, Shu-ichiro Inutsuka, Masahiro N. Machida
We investigate the formation process of self-gravitating protoplanetary disks in unmagnetized molecular clouds. The angular momentum is redistributed by the action of gravitational…