Eiji Akiyama

ALMA Band 7 Observations of Water Lines in the Protoplanetary Disk of V883 Ori

Hiroto Nakasone, Shota Notsu, Tomohiro C. Yoshida, Hideko Nomura et autres

Abstract The FU Orionis star V883 Ori provides a unique opportunity to probe the water snowline in a protoplanetary disk. During an accretion burst, the enhanced stellar luminosity heats the disk, sublimating ices and bringing volatile species into the gas phase. The …

Direct Imaging Explorations for Companions from the Subaru/IRD Strategic Program II; Discovery of a Brown-dwarf Companion around a Nearby Mid-M-dwarf LSPM J1446+4633

Taichi Uyama, Masayuki Kuzuhara, Charles Beichman, Teruyuki Hirano et autres

Abstract We report the discovery of a new directly imaged brown-dwarf companion with Keck/NIRC2+pyWFS around a nearby mid-type M-dwarf LSPM J1446+4633 (hereafter J1446). The L ′ -band contrast (4.5 × 10−3) is consistent with a ∼20–60 M Jup object at 1–10 Gyr …

Direct Imaging Explorations for Companions from the Subaru/IRD Strategic Program II; Discovery of a Brown-dwarf Companion around a Nearby mid-M~dwarf LSPM~J1446+4633

Taichi Uyama, Masayuki Kuzuhara, Charles Beichman, Teruyuki Hirano et autres

We report the discovery of a new directly-imaged brown dwarf companion with Keck/NIRC2+pyWFS around a nearby mid-type M~dwarf LSPM~J1446+4633 (hereafter J1446). The $L'$-band contrast ($4.5\times10^{-3}$) is consistent with a $\sim20-60\ M_{\rm Jup}$ object at 1--10~Gyr and our two-epoch NIRC2 data suggest a …

Extreme Asymmetry in the Polarized Disk of V1247 Orionis *

Misato Fukagawa, Michael L. Sitko, Takayuki Muto, Stefan Kraus et autres

We present the first near-infrared scattered-light detection of the transitional disk around V1247 Ori, which was obtained using high-resolution polarimetric differential imaging observations with Subaru/HiCIAO. Our imaging in the H band reveals the disk morphology at separations of 0.′′14–0.′′86 (54–330 au) from …

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Multiple Rings and Asymmetric Structures in the Disk of SR 21

Yi Yang, Hauyu Baobab Liu, Takayuki Muto, Jun Hashimoto et autres

Abstract Crescent-like asymmetric dust structures discovered in protoplanetary disks indicate dust aggregations. Thus, researching these structures helps us understand the planet formation process. Here we analyze ALMA data of the protoplanetary disk around the T-Tauri star SR 21, which has asymmetric structures …

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ALMA Band 6 high-resolution observations of the transitional disk around SY Chamaeleontis

Ryuta Orihara, Munetake Momose, Takayuki Muto, Jun Hashimoto et autres

Abstract In this study, we reported the results of high-resolution (${0{^{\prime \prime}_{.}}14}$) Atacama Large Millimeter/submillimeter Array (ALMA) observations of the 225 GHz dust continuum and CO molecular emission lines from the transitional disk around SY Cha. Our high-resolution observations clearly revealed the …

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Gap Opening and Inner Disk Structure in the Strongly Accreting Transition Disk of DM Tau

Logan Francis, Nienke van der Marel, Doug Johnstone, Eiji Akiyama et autres

Abstract Large inner dust gaps in transition disks are frequently posited as evidence of giant planets sculpting gas and dust in the disk, or the opening of a gap by photoevaporative winds. Although the former hypothesis is strongly supported by the observations …

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Direct-imaging Discovery and Dynamical Mass of a Substellar Companion Orbiting an Accelerating Hyades Sun-like Star with SCExAO/CHARIS*

Masayuki Kuzuhara, Thayne Currie, Takuya Takarada, Timothy D. Brandt et autres

Abstract We present the direct-imaging discovery of a substellar companion in orbit around a Sun-like star member of the Hyades open cluster. So far, no other substellar companions have been unambiguously confirmed via direct imaging around main-sequence stars in Hyades. The star …

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Monitoring Inner Regions in the RY Tau Jet

Taichi Uyama, M. Takami, Gabriele Cugno, Vincent Déo et autres

Abstract We present multiepoch observations of the RY Tau jet for Hα and [Fe ii] 1.644 μm emission lines obtained with the Subaru Coronagraphic Extreme-AO and Visible Aperture Masking Polarimetric Imager for Resolved Exoplanetary Structures (VAMPIRES), Gemini Near-infrared Integral Field Spectrograph, and …

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SCExAO/CHARIS Direct Imaging of A Low-mass Companion At A Saturn-like Separation from an Accelerating Young A7 Star

Jeffrey Chilcote, Taylor Tobin, Thayne Currie, Timothy D. Brandt et autres

Abstract We present the SCExAO direct imaging discovery and characterization of a low-mass companion to the nearby young A7IV star, HD 91312. SCExAO/CHARIS JHK (1.1–2.4 μm) spectra and SCExAO/HiCIAO H-band imaging identify the companion over a two year baseline in a highly …

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SCExAO/CHARIS Direct Imaging of A Low-Mass Companion At A Saturn-Like Separation from an Accelerating Young A7 Star

Jeffrey Chilcote, Taylor Tobin, Thayne Currie, Timothy D. Brandt et autres

We present the SCExAO direct imaging discovery and characterization of a low-mass companion to the nearby young A7IV star, HD 91312. SCExAO/CHARIS $JHK$ (1.1-2.4 $\mu m$) spectra and SCExAO/HiCIAO $H$ band imaging identify the companion over a two year baseline in a …

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High Spatial Resolution Observations of Molecular Lines toward the Protoplanetary Disk around TW Hya with ALMA

Hideko Nomura, Takashi Tsukagoshi, Ryohei Kawabe, Takayuki Muto et autres

Abstract We present molecular line observations of 13CO and C18O J = 3 − 2, CN N = 3 − 2, and CS J = 7 − 6 lines in the protoplanetary disk around TW Hya at a high spatial resolution of …

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