A5012270861- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Stellar, planetary, and galactic studies
- Pulsars and Gravitational Waves Research
- Semiconductor Quantum Structures and Devices
- Astronomy and Astrophysical Research
- Photorefractive and Nonlinear Optics
- Galaxies: Formation, Evolution, Phenomena
- Advanced Fiber Laser Technologies
- Advanced Semiconductor Detectors and Materials
- Nuclear physics research studies
- Photonic and Optical Devices
- Adaptive optics and wavefront sensing
- Astro and Planetary Science
- Semiconductor Lasers and Optical Devices
- Astronomical Observations and Instrumentation
- GNSS positioning and interference
- Mobile and Web Applications
- Semiconductor materials and devices
- Photonic Crystals and Applications
- CCD and CMOS Imaging Sensors
- Astronomical and nuclear sciences
- Quantum Dots Synthesis And Properties
- Methane Hydrates and Related Phenomena
National Astronomical Observatory of Japan
2022-2024
National Institutes of Natural Sciences
2022-2024
University of Science and Technology of China
2023-2024
Institute of Modern Physics
2017-2023
Chinese Academy of Sciences
2017-2023
University of Chinese Academy of Sciences
2017-2023
The University of Tokyo
2016-2022
Kavli Institute for the Physics and Mathematics of the Universe
2019-2022
Nanjing University of Posts and Telecommunications
2015-2022
National Center for Nanoscience and Technology
2019
Postgrowth rapid thermal annealing was used to modify the structural and optical properties of self-assembled InAs quantum dots grown on GaAs substrates by molecular beam epitaxy. It is found that significant narrowing luminescence linewidth (from 78.9 20.5 meV) from dot layer occurs together with about 260 meV blueshift at temperatures up 850 °C. Observation high-resolution transmission electron microscopy shows existence under lower but disappearance annealed The excited-state-filling...
Abstract Although chirality has been recognized as an essential entity for life, it still remains a big mystery how the homochirality in nature emerged biomolecules. Certain achiral motifs are known to assemble into chiral nanostructures. In rare cases, their absolute geometries enantiomerically biased by mirror symmetry breaking. Here we report first example of asymmetric catalysis using symmetry-broken helical nanoribbon ligand. We obtain this from benzoic acid appended...
We present rapidly rising transients discovered by a high-cadence transient survey with Subaru telescope and Hyper Suprime-Cam. five at z=0.384-0.821 showing the rate faster than 1 mag per day in restframe near-ultraviolet wavelengths. The fast brightness are most similar to SN 2010aq PS1-13arp, for which ultraviolet emission within few days after shock breakout was detected. lower limit of event is ~9 % core-collapse supernova rates, assuming duration rapid rise be day. show that light...
Abstract The unluckiest star orbits a supermassive black hole elliptically. Every time it reaches the pericenter, shallowly enters tidal radius and gets partially tidally disrupted, producing series of flares. Confirmation repeated partial disruption event (pTDE) requires not only evidence to rule out other types transients but also proof that one is involved, as TDEs from multiple stars can produce similar In this Letter, we report discovery pTDE, AT 2022dbl. quiescent galaxy at z = 0.0284,...
A quantum dot infrared photodetector (QDIP) consisting of self-assembled InGaAs dots has been demonstrated. Responsivity 3.25 mA/W at 9.2 μm was obtained for nonpolarized incident light on the detector with a 45° angle facet 60 K. The QDIPs exhibit some unique electro-optic characteristics such as strong negative differential photoconductance effect and blueshift response peak wavelength.
In this Letter we report a discovery of prominent flash peculiar overluminous Type Ia supernova, SN 2020hvf, in about 5 hours the supernova explosion by first wide-field mosaic CMOS sensor imager, Tomo-e Gozen Camera. The fast evolution early was captured intensive intranight observations via high-cadence survey. Numerical simulations show that such and emission is most likely generated from an interaction between $0.01~M_{\odot}$ circumstellar material (CSM) extending to distance...
Over-luminous type Ia supernovae (SNe Ia) show peculiar observational features, for which an explosion of a super-massive white dwarf (WD) beyond the classical Chandrasekhar-limiting mass has been suggested, largely based on their high luminosities and slow light-curve evolution. However, features are diverse, with few extremely whose origins have not clarified; strong persisting C II lines, late-time accelerated luminosity decline red spectra, sub-day time-scale initial flash clearly...
Abstract High-cadence, multiwavelength observations have continuously revealed the diversity of tidal disruption events (TDEs), thus greatly advancing our knowledge and understanding TDEs. In this work, we conducted an intensive optical-UV X-ray follow-up campaign TDE AT 2023lli found a remarkable month-long bump in its UV/optical light curve nearly 2 months prior to maximum brightness. The represents longest separation time from main peak among known TDEs date. outburst declines as t −4.10...
We report a high detectivity middle-wavelength infrared quantum dot photodetector (QDIP). The InGaAs dots were grown by self-assembly on an InGaP matrix via low pressure metalorganic chemical vapor deposition. Photoresponse was observed at temperatures above 200 K with peak wavelength of 4.7 μm and cutoff 5.2 μm. background limited performance temperature 140 K, this attributed to the super dark current in QDIP. A 3.6×1010 cm Hz1/2/W, which is comparable state-of-the-art well photodetectors...
Abstract Rapidly evolving transients form a new class of that show shorter timescales light curves than those typical core-collapse and thermonuclear supernovae. We performed systematic search for rapidly using deep data taken with the Hyper Suprime-Cam Subaru Strategic Program Transient Survey. By measuring 1824 transients, we identified five transients. Our samples are found in wide range redshifts (0.3 ≤ z 1.5) peak absolute magnitudes (−17 ≥ M i −20). The light-curve properties similar...
Abstract Thanks to the rapidly increasing time-domain facilities, we are entering a golden era of research on gamma-ray bursts (GRBs). In this Letter, report our observations GRB 240529A with Burst Optical Observer and Transient Exploring System, 1.5 m telescope at Observatorio de Sierra Nevada, 2.5 Wide Field Survey Telescope China, Large Binocular Telescope, Telescopio Nazionale Galileo. The prompt emission shows two comparable energetic episodes separated by quiescence time roughly 400 s....
We report our first discoveries of high-redshift supernovae from the Subaru HIgh-Z sUpernova CAmpaign, transient survey using Subaru/Hyper Suprime-Cam (HSC). discovery three at spectroscopically confirmed redshifts 2.399 (HSC16adga), 1.965 (HSC17auzg), and 1.851 (HSC17dbpf), two supernova candidates with host galaxy photometric 3.2 (HSC16apuo) 4.2 (HSC17dsid), respectively. In this paper, we present their properties, spectroscopic properties are presented in accompanying paper. The z ≃ 2...
The Wide Field Survey Telescope (WFST) is a dedicated photometric surveying facility built jointly by the University of Science and Technology China (USTC) Purple Mountain Observatory (PMO). Since many its scientific objectives rely on near-real-time data for effective analysis, prompt processing WFST images great significance. To meet this need, we adapted Rubin Legacy Space Time (LSST) science pipelines to handle collected WFST. This paper presents complete workflow, from ingestion raw...
Wide-field surveys have markedly enhanced the discovery and study of solar system objects (SSOs). The 2.5-meter Wide Field Survey Telescope (WFST) represents foremost facility dedicated to optical time-domain in northern hemisphere. To fully exploit WFST's capabilities for SSO detection, we developed a heliocentric-orbiting processing (HOPS) tailored identifying these objects. This integrates HelioLinC3D, an algorithm well suited WFST survey cadence, characterized by revisiting same sky...
Abstract The discovery of the kilonova (KN) AT 2017gfo, accompanying gravitational wave event GW170817, provides crucial insight into synthesis heavy elements during binary neutron star (BNS) mergers. Following this landmark event, another KN was detected in association with second-brightest gamma-ray burst (GRB) observed to date, GRB 230307A, and subsequently confirmed by observations James Webb Space Telescope (JWST). In work, we conduct an end-to-end simulation analyze temporal evolution...
Abstract Wide-field surveys have markedly enhanced the discovery and study of solar system objects. The 2.5 m Wide Field Survey Telescope (WFST) represents foremost facility dedicated to optical time-domain in Northern Hemisphere. To fully exploit WFST’s capabilities for object detection, we developed a heliocentric-orbiting objects processing (HOPS) tailored identifying these HOPS integrates HelioLinC3D, an algorithm well suited WFST survey cadence, characterized by revisiting same sky...
Abstract As the time-domain survey telescope of highest power in Northern Hemisphere currently, Wide Field Survey Telescope (WFST) is scheduled to hourly/daily/semiweekly scan sky up ∼23 mag four optical ( ugri ) bands. Unlike observation cadences forthcoming regular missions, WFST performed “staring” observations toward Galactic plane a cadence ≈1 minute for total on-source time about 13 hr during commissioning and pilot phases. Such an well applied producing densely sampled light curves...
The mechanism for the early-phase blue and excessive emission within first few days, reported so far a type Ia supernovae (SNe Ia), has been suggested to be interaction of SN ejecta either with non-degenerate companion star or circumstellar media (CSM). Recently, another context He detonation-triggered scenario (i.e., double detonation He-ignited violent merger), in which radioactive isotopes outermost layer produce early emission. In this paper, we investigate properties predicted by these...
Abstract We present optical observations of the Type Ia supernova (SN) 2019ein, starting two days after estimated explosion date. The spectra and light curves show that SN 2019ein belongs to a high-velocity (HV) broad-line group with relatively rapid decline in (Δ m 15 ( B ) = 1.36 ± 0.02 mag) short rise time (15.37 0.55 days). Si ii λ 6355 velocity, associated photospheric component but not detached feature, reached ∼20,000 km s −1 12 before -band maximum. line however, decreased very...
Abstract Observation datasets acquired by the Hyper Suprime-Cam (HSC) on Subaru Telescope for NASA’s New Horizons mission target search were analyzed through a method devised JAXA. The makes use of Field Programmable Gate arrays and was originally used to detect fast-moving objects such as space debris or near-Earth asteroids. Here we present an application slow-moving Kuiper Belt Objects (KBOs) in observations. A cadence that takes continuous images one HSC field view half night fits well....
Early-phase Type Ia supernovae (SNe Ia), especially those with luminosity enhancement within the first few days of explosions ("early-excess SNe Ia"), play an irreplaceable role in addressing long-standing progenitor and explosion issue Ia. In this paper, we systematically investigate 11 early-excess from subluminous to luminous subclasses. Eight them are selected 23 extremely early-phase optical light curves ("golden" three 40 (including 14 golden samples) UV/NUV curves. We found that...