78 citations · 549 across the 27 of their papers we have counts for
28 papers
FAUST XXXII. Chemically layered structures and ionisation in the disk and envelope of NGC 1333 IRAS 4C
Shota Notsu, Nami Sakai, Yichen Zhang +71
Recent molecular line observations with high spatial resolutions have revealed vertical chemical stratification in Class I/II disks (i.e. chemical composition changing with height…
Thermochemical constraints on a primordial-origin of gas-rich debris disks
H. Mitani, W. Ooyama, R. Nakatani +2
Recent observations have revealed gas-rich debris disks around intermediate-mass stars at ages of tens of Myr. The origin of this gas remains unclear: it may be primordial, retaine…
From streamers to stars: Overcoming mass loss in protoplanetary disks
W. Ooyama, R. Nakatani, T. Hosokawa +1
Recent high-resolution observations have revealed filamentary accretion flows (``streamers'') in protoplanetary disks older than 1 Myr, suggesting that late-stage interstellar gas…
Finding New Debris Discs at Sub-millimetre Wavelengths
Mark Booth, Patricia Luppe, Sebastian Marino +9
Debris discs reveal the architectures and dynamical histories of planetary systems. Sub-millimetre observations trace large dust grains within debris discs, revealing their bulk pr…
Photoevaporation Can Reproduce Extended Emission from Protoplanetary Disks Imaged by JWST MIRI
R. Nakatani, G. Rosotti, B. Tabone +1
Understanding dispersal of protoplanetary disks remains a central challenge in planet formation theory. Disk winds, driven by magnetohydrodynamics (MHD) and/or photoevaporation, ar…
Model of X-ray and extreme-UV emission from magnetically heated atmospheres in classical T Tauri stars: Case study of TW Hya
Munehito Shoda, Riouhei Nakatani, Shinsuke Takasao
Photoevaporation caused by X-rays and ultraviolet radiation from the central star has attracted attention as a key process driving the dispersal of protoplanetary discs. Although n…
Physically motivated analytic model of energy efficiency for EUV-driven atmospheric escape of close-in exoplanets
Hiroto Mitani, Riouhei Nakatani, Rolf Kuiper
Extreme Ultraviolet (EUV) driven atmospheric escape is a key process in the atmospheric evolution of close-in exoplanets. In many evolutionary models, the energy-limited mass-loss…
Water vapor as a probe of the origin of gas in debris disks
Yasuhiro Hasegawa, Riouhei Nakatani, Isabel Rebollido +5
Debris disks embrace the formation and evolution histories of planetary systems. Recent detections of gas in these disks have received considerable attention, as its origin ties up…
Secret of Longevity: Protoplanetary Disks as a Source of Gas in Debris Disks
Wataru Ooyama, Riouhei Nakatani, Takashi Hosokawa +2
While protoplanetary disks (PPDs) are generally thought to disperse within several million years, recent observations have revealed gas in their older counterparts, debris disks. T…
Broadening the Canonical Picture of EUV-Driven Photoevaporation of Accretion Disks
Riouhei Nakatani, Neal J. Turner, Shinsuke Takasao
Photoevaporation driven by hydrogen-ionizing radiation, also known as extreme-ultraviolet (EUV), profoundly shapes the lives of diverse astrophysical objects. Focusing here mainly…
A Primordial Origin for the Gas-Rich Debris Disks Around Intermediate-Mass Stars
Riouhei Nakatani, Neal J. Turner, Yasuhiro Hasegawa +4
While most debris disks consist of dust with little or no gas, a fraction has significant amounts of gas detected via emission lines of CO, ionized carbon, and/or atomic oxygen. Al…
Formation of dust clumps with sub-Jupiter mass and cold shadowed region in gravitationally unstable disk around Class 0/I protostar in L1527 IRS
Satoshi Ohashi, Riouhei Nakatani, Hauyu Baobab Liu +4
We have investigated the protostellar disk around a Class 0/I protostar, L1527 IRS, using multi-wavelength observations of the dust continuum emission at , 2.1, 3.3, and 6.…
Chemical and Physical Characterization of the Isolated Protostellar Source CB68: FAUST. IV
Muneaki Imai, Yoko Oya, Brian Svoboda +1
Chemical diversity of low-mass protostellar sources has so far been recognized, and environmental effects are invoked as its origin. In this context, observations of isolated proto…
FAUST III. Misaligned rotations of the envelope, outflow, and disks in the multiple protostellar system of VLA 16232417
Satoshi Ohashi, Claudio Codella, Nami Sakai +69
We report a study of the low-mass Class-0 multiple system VLA 1623AB in the Ophiuchus star-forming region, using HCO (), CS (), and CCH () lines as…
Stellar Wind Effect on the Atmospheric Escape of Hot Jupiters and their Ly- and H transits
Hiroto Mitani, Riouhei Nakatani, Naoki Yoshida
Atmospheric escape of close-in exoplanets can be driven by high energy radiation from the host star. The planetary outflows interacting with the stellar wind may generate observabl…
Rapid growth of seed black holes during early bulge formation
Kohei Inayoshi, Riouhei Nakatani, Daisuke Toyouchi +3
We study the early growth of massive seed black holes (BHs) via accretion in protogalactic nuclei where the stellar bulge component is assembled, performing axisymmetric two-dimens…
FAUST II. Discovery of a Secondary Outflow in IRAS 15398-3359: Variability in Outflow Direction during the Earliest Stage of Star Formation?
Yuki Okoda, Yoko Oya, Logan Francis +66
We have observed the very low-mass Class 0 protostar IRAS 15398-3359 at scales ranging from 50 au to 1800 au, as part of the ALMA Large Program FAUST. We uncover a linear feature,…
Ring formation by coagulation of dust aggregates in early phase of disk evolution around a protostar
Satoshi Ohashi, Hiroshi Kobayashi, Riouhei Nakatani +6
Ring structures are observed by (sub-)millimeter dust continuum emission in various circumstellar disks from early stages of Class 0 and I to late stage of Class II young stellar o…
Radiation hydrodynamics simulations of protoplanetary disks: Stellar mass dependence of the disk photoevaporation rate
Ayano Komaki, Riouhei Nakatani, Naoki Yoshida
Recent multi-wavelength observations suggest that inner parts of protoplanetary disks (PPDs) have shorter lifetimes for heavier host stars. Since PPDs around high-mass stars are ir…
Hydrodynamical simulations of protoplanetary disks including irradiation of stellar photons. I. Resolution study for Vertical Shear Instability (VSI)
Lizxandra Flores-Rivera, Mario Flock, Ryohei Nakatani
In recent years hydrodynamical (HD) models have become important to describe the gas kinematics in protoplanetary disks, especially in combination with models of photoevaporation a…
Photoevaporation of Grain-Depleted Protoplanetary Disks around Intermediate-Mass Stars: Investigating Possibility of Gas-Rich Debris Disks as Protoplanetary Remnants
Riouhei Nakatani, Hiroshi Kobayashi, Rolf Kuiper +2
Debris disks are classically considered to be gas-less systems, but recent (sub)millimeter observations have detected tens of those with rich gas content. The origin of the gas com…
Photoevaporation of Minihalos during Cosmic Reionization: Primordial and Metal-Enriched Halos
Riouhei Nakatani, Anastasia Fialkov, Naoki Yoshida
The density distribution of the inter-galactic medium is an uncertain but highly important issue in the study of cosmic reionization. It is expected that there are abundant gas clo…
Atmospheric Escape of Close-in Giants around Hot Stars: Far-Ultraviolet Radiation and Photoelectric Heating Effect
Hiroto Mitani, Riouhei Nakatani, Naoki Yoshida
Atmospheric escape is an important process that controls the long-term evolution of close-in planets. We perform radiation hydrodynamics simulations of photo-evaporation of exoplan…
Substructure Formation in a Protostellar Disk of L1527 IRS
Riouhei Nakatani, Hauyu Baobab Liu, Satoshi Ohashi +5
We analyze multi-frequency, high-resolution continuum data obtained by ALMA and JVLA to study detailed structure of the dust distribution in the infant disk of a Class~0/I source,…