Misato Fukagawa
A5029599213- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Astrophysical Phenomena and Observations
- Astro and Planetary Science
- Gamma-ray bursts and supernovae
National Astronomical Observatory of Japan
2019-2022
National Institutes of Natural Sciences
2019
Abstract We report the analysis of additional multiband photometry and spectroscopy new adaptive optics (AO) imaging nearby planetary microlensing event TCP J05074264+2447555 (Kojima-1), which was discovered toward Galactic anticenter in 2017 (Nucita et al.). confirm nature light-curve anomaly around peak while finding no feature this event. also presence apparent blending flux absence significant parallax signal reported literature. The AO image reveals contaminating sources, making it most...
We present two new epochs of Hubble Space Telescope/Space Telescope Imaging Spectrograph coronagraphic imaging, along with multi-epoch optical, near-IR, and radio monitoring, the HD 163296 system. find ansae features identified in earlier epoch HST imagery are a 4th ring, that resides at semi-major axis distance 3.25" (330 au). determine scale height dust is 64 au radial 330 au. observe surface brightness variations ring on <3 month timescales, including large-scale, azimuthally asymmetric...
We present L'-band Keck/NIRC2 imaging and H-band Subaru/AO188+HiCIAO polarimetric observations of the CQ Tau disk with a new spiral arm. Apart from feature, our could not detect any companion candidates. traced feature r2-scaled High-Contrast Coronographic Imager for Adaptive Optics (HiCIAO) intensity image fitted result is used forward modeling to reproduce ADI-reduced NIRC2 image. estimated original surface brightness after throughput correction in L' band be ∼126 mJy arcsec−2 at most....
Abstract For the active T-Taur star RW Aur A we have performed long-term (∼10 yr) monitoring observations of (1) jet imaging in [Fe II] 1.644 μ m emission line using Gemini-NIFS and VLT-SINFONI; (2) optical high-resolution spectroscopy CFHT-ESPaDOnS; (3) V -band photometry CrAO 1.25-m telescope AAVSO. The latter two confirm correlation time variabilities between (A) Ca II 8542 Å O I 7772 profiles associated with magnetospheric accretion, (B) continuum fluxes. images their proper motions show...
We present Gemini-NIFS, VLT-SINFONI and Keck-OSIRIS observations of near-infrared [Fe II] emission associated with the well-studied jets from three active T Tauri stars; RW Aur A, RY Tau DG taken 2012-2021. primarily covered redshifted jet blueshifted Tau, to investigate long-term time variabilities potentially related activities mass accretion and/or stellar magnetic fields. All these consist several moving knots tangential velocities 70-240 km s-1, ejected star different at irregular...
The SR24 multi-star system hosts both circumprimary and circumsecondary disks, which are strongly misaligned from each other. disk is circumbinary in nature. Interestingly, disks interacting, they possibly rotate opposite directions. To investigate the nature of this unique twin system, we present 0.''1 resolution near-infrared polarized intensity images circumstellar structures around SR24, obtained with HiCIAO mounted on Subaru 8.2 m telescope. Both resolved have elongated features. While...
For the active T-Taur star RW Aur A we have performed long-term (~10 yr) monitoring observations of (1) jet imaging in [Fe II] 1.644-micron emission line using Gemini-NIFS and VLT-SINFONI; (2) optical high-resolution spectroscopy CFHT-ESPaDOnS; (3) V-band photometry CrAO 1.25-m telescope AAVSO. The latter two confirm correlation time variabilities between (A) Ca II 8542 O I 7772 profiles associated with magnetospheric accretion, (B) continuum fluxes. images their proper motions show that...