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On Secular Gravitational Instability in Vertically Stratified Disks
Ryosuke T. Tominaga, Shu-ichiro Inutsuka, Sanemichi Z. Takahashi
Secular gravitational instability (GI) is one promising mechanism for explaining planetesimal formation. The previous studies on secular GI utilized a razor-thin disk model and der…
ALMA Band 6 high-resolution observations of the transitional disk around SY Cha
Ryuta Orihara, Munetake Momose, Takayuki Muto +10
In this study, we reported the results of high-resolution (0.14 arcsec) Atacama Large Millimeter/submillimeter Array (ALMA) observations of the 225 GHz dust continuum and CO molecu…
Planetesimal formation by the gravitational instability of dust ring structures
Sanemichi Z. Takahashi, Eiichiro Kokubo, Shu-ichiro Inutsuka
We investigate the gravitational instability (GI) of dust-ring structures and the formation of planetesimals by their gravitational collapse. The normalized dispersion relation of…
ALMA High-resolution Multiband Analysis for the Protoplanetary Disk around TW Hya
Takashi Tsukagoshi, Hideko Nomura, Takayuki Muto +10
We present a high-resolution (2.5 au) multiband analysis of the protoplanetary disk around TW Hya using ALMA long baseline data at Bands 3, 4, 6, and 7. We aim to reconstruct a hig…
ALMA observation of the protoplanetary disk around WW Cha: faint double-peaked ring and asymmetric structure
Kazuhiro D. Kanagawa, Jun Hashimoto, Takayuki Muto +13
We present Atacama Large Millimeter/submillimeter Array (ALMA) Band 6 observations of dust continuum emission of the disk around WW Cha. The dust continuum image shows a smooth dis…
Secular Gravitational Instability of Drifting Dust in Protoplanetary Disks: Formation of Dusty Rings without Significant Gas Substructures
Ryosuke T. Tominaga, Sanemichi Z. Takahashi, Shu-ichiro Inutsuka
Secular gravitational instability (GI) is one of the promising mechanisms for creating annular substructures and planetesimals in protoplanetary disks. We perform numerical simulat…
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…
The detection of dust gap-ring structure in the outer region of the CR Cha protoplanetary disk
Seongjoong Kim, Sanemichi Takahashi, Hideko Nomura +13
We observe the dust continuum at 225 GHz and CO isotopologue (12CO, 13CO, and C18O) J=2-1 emission lines toward the CR Cha protoplanetary disk using the Atacama Large Millimeter/Su…
Revised description of dust diffusion and a new instability creating multiple rings in protoplanetary disks
Ryosuke T. Tominaga, Sanemichi Z. Takahashi, Shu-ichiro Inutsuka
Various instabilities have been proposed as a promising mechanism to accumulate dust. Moreover, some of them are expected to lead to the multiple-ring structure formation and the p…
Non-linear Development of Secular Gravitational Instability in Protoplanetary Disks
Ryosuke T. Tominaga, Shu-ichiro Inutsuka, Sanemichi Z. Takahashi
We perform non-linear simulation of secular gravitational instability (GI) in protoplanetary disks that has been proposed as a mechanism of the planetesimal formation and the multi…
Orbital Evolution of Moons in Weakly Accreting Circumplanetary Disks
Yuri I. Fujii, Hiroshi Kobayashi, Sanemichi Z. Takahashi +1
We investigate the formation of hot and massive circumplanetary disks (CPDs) and the orbital evolution of satellites formed in these disks. Because of the comparatively small size-…
Significant Gas-to-Dust Ratio Asymmetry and Variation in the Disk of HD 142527 and the Indication of Gas Depletion
Takayuki Muto, Takashi Tsukagoshi, Munetake Momose +14
We investigate the dust and gas distribution in the disk around HD 142527 based on ALMA observations of dust continuum, 13CO(3-2), and C18O(3-2) emission. The disk shows strong azi…
Two-Component Secular Gravitational Instability in a Protoplanetary Disk: A Possible Mechanism for Creating Ring-Like Structures
Sanemichi Z. Takahashi, Shu-ichiro Inutsuka
The instability in protoplanetary disks due to gas-dust friction and self-gravity of gas and dust is investigated by linear analysis. In the case where the dust to gas ratio is enh…