Toshihisa Fujiyoshi

Aichi Cancer Center · Department of Gastroenterology

An essential component of planetary climatology is knowledge of the tropospheric temperature field and its variability. Previous studies of Jupiter hinted at non-seasonal periodic behaviour, as well as the presence of a dynamical relationship between tropospheric and stratospheric temperatures. However, these observations were made over time frames...

A multi-decade record of ground-based mid-infrared (7-25 $\mu$m) images of Saturn is used to explore seasonal and non-seasonal variability in thermal emission over more than a Saturnian year (1984-2022). Thermal emission measured by 3-m and 8-m-class observatories compares favourably with synthetic images based on both Cassini-derived temperature r...

An essential component of planetary climatology is knowledge of the tropospheric temperature field and its variability. Previous studies of Jupiter hinted at periodic behavior that was non-seasonal, as well as dynamical relationships between tropospheric and stratospheric temperatures. However, these observations were made over time frames shorter...

We present an analysis of all currently available ground-based imaging of Neptune in the mid-infrared. Dating between 2003 and 2020, the images reveal changes in Neptune’s mid-infrared (∼8–25 μ m) emission over time in the years surrounding Neptune’s 2005 southern summer solstice. Images sensitive to stratospheric ethane (∼12 μ m), methane (∼8 μ m)...

A four-decade study of ground-based mid-infrared observations of Jupiter covering three and a half of its solar orbits over ±30° of latitude has revealed unexpected variations of upper-tropospheric temperatures. Patterns of variability with 10-14 year periods at discrete latitudes were discovered, all within ±2 years of Jupiter’s 11.9-year orbital...

The formation of massive stars in dense and cold molecular clouds is a fundamental problem in star formation. In this work, we studied three compact massive star-forming regions, M8E, RAFGL 6366S, and IRAS 18317−0513, to investigate the environment of massive star formation, specifically the possibility of a local feedback process. Our new mid-infr...

We present an analysis of all currently available ground-based imaging of Neptune in the mid-infrared. Dating between 2003 and 2020, the images reveal changes in Neptune's mid-infrared (~8-25 micron) emission over time. Images sensitive to stratospheric ethane (~12 micron), methane (~8 micron), and CH3D (~9 micron) display significant sub-seasonal...

Asteroid 162173 1999 JU3 is an Apollo-type near-Earth asteroid, which is one of the most accessible asteroids by spacecraft. It has been selected as a target for the Japanese sample return mission , Hayabusa-2 [1]. This asteroid was observable in 2007. We conducted an observational campaign of this asteroid. We summarize the observations of 1999 JU...

Chopping observations with a tip-tilt secondary mirror have conventionally been used in ground-based mid-infrared observations. However, it is not practical for next generation large telescopes to have a large tip-tilt mirror that moves at a frequency larger than a few Hz. We propose an alternative observing method, a "slow-scanning" observation. I...

A new classification of magnifying endoscopy with narrow band imaging (ME-NBI) for diagnosing and staging superficial esophageal squamous cell carcinoma (SESCC) was proposed by the Japan Esophageal Society in 2011. This study aimed to compare the new classification with the conventional classifications (Inoue's classification and Arima's classifica...

The Herbig Ae star HD 169142 is one of the objects that show complex structure, such as multiple (innermost, middle, and outer) disks, gaps, and unresolved sources. We made N-band (8–13 μm) observations of HD 169142 with the Cooled Mid-Infrared Camera and Spectrometer on the 8.2 m Subaru Telescope. The images are spatially resolved out to an ~1'' r...

Background and study aims The standard colonoscopy preparation regimen in Japan for afternoon procedures is sequential intake of 1 L of polyethylene glycol electrolyte lavage solution containing ascorbic acid (PEG-ASC), 0.5 L of clear liquid, 0.5 L of PEG-ASC, and finally 0.25 L of clear fluids (all at a rate of 0.25 L every 15 min). However, this...

Objective Some patients with malignant gastric outlet obstruction require combined biliary and gastroduodenal stenting (double stenting). However, biliary stent dysfunction can often disturb biliary route maintenance, thus making the optimal biliary stenting for these patients unclear. The present study was designed to assess the factors associated...

This study investigates the temporal evolution of the infrared emission from the dusty nova V1280 Sco over 2000 days from the outburst. We have revealed that the infrared spectral energy distributions at 1272, 1616 and 1947 days are explained by the emissions produced by amorphous carbon dust of mass (6.6-8.7) × 10-8 Mʘ with a representative grain...

Evaluation of polyethylene glycol electrolyte lavage solution containing ascorbic acid (PEG-ASC) has been controversial in the point of its hyperosmolarity, especially in old population. So we therefore designed the present study to compare the efficacy, acceptability, tolerability, and safety of 1.5 L PEG+ASC and 2 L standard PEG electrolyte solut...

Objectives: The modified Glasgow prognostic score (mGPS) is known to be useful in determining the prognosis of cancers. However, the utility of mGPS for pancreatic cancer (PC) has been examined based primarily on a surgical series of early-stage cancers. The purpose of this study was to examine the utility of mGPS for PC of all stages using a retr...

We imaged circumstellar disks around 22 Herbig Ae/Be stars at 25 \mu m using Subaru/COMICS and Gemini/T-ReCS. Our sample consists of equal numbers of objects belonging to the two categories defined by Meeus et al. (2001); 11 group I (flaring disk) and II (at disk) sources. We find that group I sources tend to show more extended emission than group...

A man in his 40s presented with liver dysfunction on a screening examination. He was working in the printing industry and had been exposed to a chlorinated organic solvent for 12 years from the age of 20. Detailed examination revealed hilar bile duct cancer; proton radiotherapy was initiated. About three years after completing the proton radiothera...

Background Cholangiocarcinoma has been reported in workers exposed to chlorinated organic solvents and has consequently been classified as an occupational disease (occupational cholangiocarcinoma) by the Japanese Ministry of Health, Labour and Welfare. This study aimed to identify the characteristics of nine workers newly diagnosed with occupationa...

Aim: It is believed that API2-MALT1 positive gastric MALT lymphoma exhibit a good prognosis because they do not exhibit multiple genomic abnormalities. However, there is no data on the long-term natural history and clinical outcome of API2-MALT1 positive gastric MALT lymphoma. The aim of this study was to clarify the management and long-term outcom...

Background: The WHO classified pancreatic neuroendocrine neoplasms in 2010 as G1, G2, and neuroendocrine carcinoma (NEC), according to the Ki67 labeling index (LI). However, the clinical behavior of NEC is still not fully studied. We aimed to clarify the clinicopathological and molecular characteristics of NECs. Methods: We retrospectively evalu...

Hemispherical maps of Saturn’s atmosphere made both by Cassini’s Composite Infrared Spectrometer (CIRS, 7-1000 µm) and ground-based mid-infrared observations (7-25 µm) were surveyed for the presence and properties of zonal thermal waves and their variability in time. The most inclusive CIRS surveys, FIRMAPs (15 cm-1 spectral resolution), covered th...

Formation of massive stars remains an open question in modern astronomy. How to prevent a massive molecular core from fragmenting into low-mass cores before it grows up to massive young stellar objects (MYSOs) is an important issue. A recent model predicts that a massive core grows up to a MYSO if it is heated by accreting radiation from less massi...

A mid-infrared (MIR) imager and spectrometer is being investigated for possible construction in the early operation of the Thirty Meter Telescope (TMT). Combined with the MIR adaptive optics (AO) system (MIRAO), the instrument will afford similar to 15 times higher sensitivity and similar to 4 times better spatial resolution (0.07") at 10 mu m comp...

CBET 3221 available at Central Bureau for Astronomical Telegrams.

Available from the Minor Planet Center.

We present results of the mid-infrared multi-epoch observations of periodically dust-making Wolf-Rayet binary WR140 with Subaru/COMICS. Based on the N- and Q-bands photometric observations, the mass evolution of dust in the expanding concentric arc structures formed during the 2001 and 2009 periastron events is investigated. Our results show that a...

The disk around the Herbig Ae star HD\,169142 was imaged and resolved at 18.8 and 24.5\,$\mu$m using Subaru/COMICS. We interpret the observations using a 2D radiative transfer model and find evidence for the presence of a large gap. The MIR images trace dust that emits at the onset of the strong rise in the spectral energy distribution (SED) at 20\...

Massive stars form whilst they are still embedded in dense envelopes. As a result, the roles of rotation, mass loss and accretion in massive star formation are not well understood. This study evaluates the source of the Q-band, lambda=19.5 microns, emission of massive young stellar objects (MYSOs). This allows us to determine the relative importanc...

We present near-infrared imaging polarimetry of the silhouette young stellar object M17-SO1. When the continuum and the scattering components are separated, the 2.17-μm Brγ image reveals the absorptive polarization vectors (i.e., magnetic field lines) exiting the mid-plane of the circumstellar envelope at relatively wide angles. Such a configuratio...

The Silences of the Archives, the Reknown of the Story. The Martin Guerre affair has been told many times since Jean de Coras and Guillaume Lesueur published their stories in 1561. It is in many ways a perfect intrigue with uncanny resemblance, persuasive deception and a surprizing end when the two Martin stood face to face, memory to memory, befor...

Earth- and space-based observations provide synergistic information for space mission encounters by providing data over longer timescales, at different wavelengths and using techniques that are impossible with an in situ flyby. We report here such observations in support of the EPOXI spacecraft flyby of comet 103P/Hartley 2. The nucleus is small an...

A mid-infrared (MIR) imager and spectrometer is under consideration for construction in the first decade of the Thirty Meter Telescope's (TMT) operation. When combined with a MIR adaptive optics system, the instrument will afford 15 times higher sensitivity, 4 times better spatial resolution (0.08") than 8m-class telescopes, and 4.5 times better sp...

The disk around AB Aur was imaged and resolved at 24.6 μm using the Cooled Mid-infrared Camera and Spectrometer on the 8.2 m Subaru Telescope. The Gaussian full width at half-maximum of the source size is estimated to be 90 ± 6 AU, indicating that the disk extends further out at 24.6 μm than at shorter wavelengths. In order to interpret the extende...

Thermal-IR imaging from space-borne and ground-based observatories was used to investigate the temperature, composition and aerosol structure of Jupiter’s Great Red Spot (GRS) and its temporal variability between 1995 and 2008. An elliptical warm core, extending over 8° of longitude and 3° of latitude, was observed within the cold anticyclonic vort...

A mid-infrared (MIR) imager and spectrometer is being investigated for possible consideration for construction in the early operation of the Thirty Meter Telescope (TMT). Combined with adaptive optics for the MIR, the instrument will afford 15 times higher sensitivity (0.1mJy as 5 sigma detection in 1hour integration in the N-band imaging) and 4 ti...

Images of stratospheric emission from Neptune obtained in 2006 at ESO's Very Large Telescope (Orton et al., 2007, A&A 473, L5) revealed a near-polar hot spot near 70 deg. S latitude that was detectable in different filters sampling both methane (~7-micron) and ethane (~12-micron) emission from Neptune's stratosphere. Such a feature was not present...

Recent AKARI/IRC observations of SN2008ax in NGC4490 on the day 98 has revealed the presence of near-infrared excess emission. This emission can be interpreted as the re-radiation from the pre-existing circumstellar amorphous carbon dust of a color temperature of 767±45 K and the mass of 1.2^{+0.4}_{-0.3} × 10^{-5} M_{&sun;} or silicate dust of 885...

We made mid-infrared (MIR) observations of the 10 M ☉ Herbig Be star HD200775 with the Cooled Mid-Infrared Camera and Spectrometer on the 8.2 m Subaru Telescope. We discovered diffuse emission of an elliptical shape extended in the north-south direction in an ~1000 AU radius around unresolved excess emission. The diffuse emission is perpendicular t...

Ground-based near- and mid-infrared observations of Saturn from 1995 - 2009, covering half a Saturnian year, provide a rich data set to model seasonal changes in both Saturn's atmosphere and its rings as a function of solar elevation. We acquired near-infrared data from NASA/Infrared Telescope Facility (IRTF); and mid-infrared data from NASA/IRTF a...

A series of emission bands in the mid-infrared, mainly at 3.3, 6.2, 7.6-7.8, 8.6 and 11.2 mum, have been ubiquitously observed in various astrophysical environments. They are originally termed unidentified infrared (UIR) bands and many previous studies based on laboratory experiments and theoretical quantum chemical calculations have lead us to the...

We discuss VLTI AMBER and MIDI interferometry in addition to single-dish Subaru observations of massive young stellar objects. The observations probe linear size scales between 10 to 1000 AU for the average distance of our sources. Comment: 2 pages, contributed talk to the ESO workshop "The Interferometric view on Hot Stars", March 2-6, 2009, Vina...

We report on the seasonal changes observed on all four of the solar system jovian planets, based on mid-infrared data acquired from several observatories (NASA/IRTF, NAOJ/Subaru, ESO/VLT) from 2005 to present. Jupiter's atmosphere underwent a global upheaval, from color transformation of discrete and axisymmetric features to interaction of giant vo...

We present mid-infrared photometry of three very young brown dwarfs located in the ρ Ophiuchi star-forming region—GY 5, GY 11, and GY 310—obtained with the Subaru 8 m telescope. All three sources were detected at 8.6 and 11.7 μm, confirming the presence of significant mid-infrared excess arising from optically thick dusty disks. The spectral energy...

We have obtained 8-13 μm spectra of 30 young (1-10 Myr) low-mass pre-main-sequence stars using COMICS on the 8.2 m Subaru Telescope to examine dust evolution in protoplanetary disks. Most spectra show silicate emission features of various strengths and shapes, indicative of dust processing during the different stages of protoplanetary disk evolutio...

Mid-infrared (MIR) images of the Herbig Ae star HD 142527 were obtained at 18.8 and 24.5 μm with the Subaru/COMICS. Bright extended arclike emission (outer disk) is recognized at r = 085 together with a strong central source (inner disk) and a gap around r = 06 in both images. The thermal emission on the eastern side is much brighter than that on t...

We present diffraction-limited (0.6'') 24.5 μm Subaru COMICS images of the red supergiant μ Cep. We report the detection of a circumstellar nebula, which was not detected at shorter wavelengths. It extends to a radius of at least 6'' in the thermal infrared. On these angular scales, the nebula is roughly spherical; in contrast, it displays a pronou...

We have observed the 8-13 μm spectrum (R ~ 250) of the Vega-like star candidate HD 145263 using Subaru/COMICS. The spectrum of HD 145263 shows the broad trapezoidal silicate feature with the shoulders at 9.3 and 11.44 μm, indicating the presence of crystalline silicate grains. This detection implies that crystalline silicate may also be commonly pr...

We have carried out mid-infrared 8-13 μm spectroscopic observations of C/2002 V1 (NEAT) and C/2001 RX14 (LINEAR) on 2003 January 10-11 UT using the Cooled Mid-Infrared Camera and Spectrometer (COMICS) on the 8.2 m Subaru Telescope. The spectra of C/2002 V1 showed the broad silicate feature with the 11.2 μm peak, indicating the presence of crystalli...

We report the negative detection of the S(1) pure rotational line emission of molecular hydrogen at 17.035 μm for four young stars, HD 163296, MWC 863, CQ Tau, and LkCa 15, for which Infrared Space Observatory (ISO) observations detected the S(1) emission, with the Cooled Mid-Infrared Camera and Spectrometer (COMICS) on the 8.2 m Subaru Telescope....

Mid-infrared observations of the Apollo-type asteroid 162173 1999 JU3 were performed in 2007 May during its close Earth approach with the AKARI space telescope and in 2007 August with the Subaru telescope. A thermophysical model analysis of the obtained data resulted in a radiometric diameter of 0.92$\pm$0.12km and a visual geometric albedo of 0.06...

Massive young stellar objects (MYSO) are surrounded by massive dusty envelopes. Our aim is to establish their density structure on scales of ~1000 AU, i.e. a factor 10 increase in angular resolution compared to similar studies performed in the (sub)mm. We have obtained diffraction-limited (0.6") 24.5 micron images of 14 well-known massive star form...

Thermal-infrared observations of the close passage of Jupiter's Great Red Spot and Oval BA serendipitously observed their interaction with a smaller and younger red anticyclone in late June through August of 2008. Filtered radiometric images were obtained at the NASA IRTF's MIRSI instrument at 7.85 - 24.5 microns, together with imaging between 8.8...

We present interferometric and single-dish mid-infrared observations of a sample of massive young stellar objects (BN-type objects), using VLTI-MIDI (10 micron) and Subaru-COMICS (24.5 micron). We discuss the regions S140, Mon R2, M8E-IR, and W33A. The observations probe the inner regions of the dusty envelope at scales of 50 milli arcsecond and 0....

Observations of oscillations of temperature and wind in planetary atmospheres provide a means of generalizing models for atmospheric dynamics in a diverse set of planets in the Solar System and elsewhere. An equatorial oscillation similar to one in the Earth's atmosphere has been discovered in Jupiter. Here we report the existence of similar oscill...

Asteroid 162173 1999 JU3 is an Apollo-type near-Earth asteroid, which is one of the most accessible asteroids by spacecraft. It has been selected as a target for the Japanese sample return mission, Hayabusa-2. This asteroid was observable in 2007 and 2008. We conducted an observational campaign of this asteroid. In this paper, we summarize the obse...

Mid-infrared observations of the Apollo-type asteroid 162173 1999 JU3 were performed in 2007 May during its close Earth approach with the AKARI space telescope and in 2007 August with the Subaru telescope. Athermophysical model analysis of the obtained data resulted in aradiometric diameter of 0.92±0.12km and avisual geometric albedo of 0.063+0.020...

Faint standard stars in the mid-infrared region (less than a few hundred millijanskys at 9 μm) are required for the on-orbit calibration of the Infrared Camera (IRC) on board ASTRO-F because of its high sensitivity, as well as the small dynamic range. Mid-infrared low-resolution (λ/Δλ ~ 250) spectra of six faint K and M giant stars (70-180 mJy at 9...

IntroductionObservationsResults and Discussion

The observations were made during 2001 July 1724 and 26, using the Submillimetre Common-User Bolometer Array (SCUBA) receiver on the 15-m James Clerk Maxwell Telescope (JCMT). (1 data file).

We have surveyed a ~0.9-square-degree area of the W3 giant molecular cloud and star-forming region in the 850-micron continuum, using the SCUBA bolometer array on the James Clerk Maxwell Telescope. A complete sample of 316 dense clumps was detected with a mass range from around 13 to 2500 Msun. Part of the W3 GMC is subject to an interaction with t...

During the sequence of observations made by Cassini CIRS from 2004 to the present, supporting observations of Saturn have been made in the same spectral region. Most of these were taken at NASA's 3-m Infrared Telescope Facility (IRTF), but they were supplemented by observations from the 8.2-m Subaru Telescope. An examination of temperature field re...

White Oval BA, constituted from 3 predecessor vortices (known as Jupiter's "classical" White Ovals) after successive mergers in 1998 and 2000, became second-largest vortex in the atmosphere of Jupiter (and possibly the solar system) at the time of its formation. While it continues in this distinction,it required a name change after a 2005 December...

We present high spatial resolution radio and near-infrared hydrogen recombination line observations of the southern massive star forming region G333.6−0.2. The 3.4-cm continuum peak is found slightly offset from the infrared (IR) source. The H90α spectra show for the first time a double-peak profile at some positions. The complex velocity structure...

We present results of our detailed analysis of the mid-infrared observation of the collision between Deep Impact projectile and comet 9/P Tempel 1, which provides crucial information on both the style of the cratering and the origin of the comet.

White Oval BA: Temperature structure and cloud properties G. Orton, P. Parrish, P. Yanamandra-Fisher, K. Baines (1), O. Mousis (2), E. Pantin (3), T. Fuse, T. Fujiyoshi (4), A. Simon-Miller (5) (1) Jet Propulsion Laboratory, Calif. Inst. of Technology, USA, (2) Obs. de Besancon, France, (3) C.E.A., France, (4) Subaru National Astron. Obs., Japan, (...

The impact cratering process on a comet is controversial but holds the key for interpreting observations of the Deep Impact collision with comet 9P/Tempel 1. Mid-infrared data from the Cooled Mid-Infrared Camera and Spectrometer (COMICS) of the Subaru Telescope indicate that the large-scale dust plume ejected by the impact contained a large mass (a...