Aoi Takahashi
A5014553006- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Adaptive optics and wavefront sensing
- Calibration and Measurement Techniques
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Spacecraft Design and Technology
- Galaxies: Formation, Evolution, Phenomena
- Spaceflight effects on biology
- Radiation Therapy and Dosimetry
- Advanced optical system design
- Astrophysics and Cosmic Phenomena
- Speech and dialogue systems
- Spacecraft and Cryogenic Technologies
- Ergonomics and Musculoskeletal Disorders
- Luminescence Properties of Advanced Materials
- Space Satellite Systems and Control
- Software Engineering Research
- Advanced Clustering Algorithms Research
- Radiation Detection and Scintillator Technologies
- Optical Systems and Laser Technology
- Wikis in Education and Collaboration
- History and Developments in Astronomy
- Advanced Text Analysis Techniques
National Astronomical Observatory of Japan
2019-2024
Institute of Space and Astronautical Science
2015-2024
Astrobiology Center
2019-2024
National Institutes of Natural Sciences
2020-2024
Tokyo Institute of Technology
2018-2021
Kwansei Gakuin University
2018-2020
The Graduate University for Advanced Studies, SOKENDAI
2017-2019
Tokyo Woman's Christian University
2013-2019
Japan Aerospace Exploration Agency
2014-2019
Rochester Institute of Technology
2018
Abstract The Japan Astrometry Satellite Mission for INfrared Exploration (JASMINE) is a planned M-class science space mission by the Institute of Space and Astronautical Science, Aerospace Agency. JASMINE has two main goals. One Galactic archaeology with Center survey, which aims to reveal Milky Way’s central core structure formation history from Gaia-level (∼25 ${\mu} $as) astrometry in near-infrared (NIR) Hw band (1.0–1.6 $m). other an exoplanet discover transiting Earth-like exoplanets...
Recent discoveries of Earth-sized planets transiting nearby M dwarfs have made it possible to characterize the atmospheres terrestrial via follow-up spectroscopic observations. However, number such receiving low insolation is still small, limiting our ability understand diversity atmospheric composition and climates temperate planets. We report discovery an planet (12 pc) inactive M3.0 dwarf Gliese 12 (TOI-6251) with orbital period ($P_{\rm{orb}}$) 12.76 days. The planet, 12b, was initially...
Abstract We report the near-infrared radial velocity (RV) discovery of a super-Earth planet on 10.77 d orbit around M4.5 dwarf Ross 508 (Jmag = 9.1). Using precision RVs from Subaru Telescope IRD (InfraRed Doppler) instrument, we derive semi-amplitude $3.92^{+0.60}_{-0.58}\:\mbox{m}\:{\mbox{s}^{-1}}$, corresponding to with minimum mass $m \sin i 4.00^{+0.53}_{-0.55}\, M_{\oplus }$. find no evidence significant signals at detected period in spectroscopic stellar activity indicators or MEarth...
We describe scientific objective and project status of an astronomical 6U CubeSat mission VERTECS (Visible Extragalactic background RadiaTion Exploration by CubeSat). The goal is to reveal the star-formation history along evolution universe measuring extragalactic light (EBL) in visible wavelength. Earlier observations have shown that near-infrared EBL several times brighter than integrated individual galaxies. As candidates for excess light, first-generation stars early or low-redshift...
Abstract We report observation of isotropic interplanetary dust (IPD) by analyzing the infrared (IR) maps Diffuse Infrared Background Experiment (DIRBE) on board Cosmic Explorer (COBE) spacecraft. To search for IPD, we perform new analysis in terms solar elongation angle ( ϵ ), because expect zodiacal light (ZL) intensity from IPD to decrease as a function . use DIRBE weekly averaged covering 64° ≲ 124° and inspect dependence residual after subtracting conventional ZL components. find...
Abstract Measuring the absolute brightness of zodiacal light (ZL), which is sunlight scattered by interplanetary dust particles, important not only for understanding physical properties but also constraining extragalactic background (EBL) subtracting ZL foreground. We describe results high-resolution spectroscopic observations night sky in wavelength range 300–900 nm with double spectrograph on Hale telescope to determine continuum spectra from Fraunhofer absorption line intensities. The...
The extragalactic background light (EBL) is the integrated emission from all objects outside of Milky Way galaxy and a crucial observational quantity in broader study history cosmic structures. In nearinfrared EBL, there have been measurements an component several times brighter than cumulative galaxies. This unknown radiation has led to proposals for candidate source objects, such as first stars galactic halo brown dwarfs. These exhibit distinct spectra visible wavelength. VERTECS (Visible...
We report on the discovery of an Earth-sized transiting planet ($R_p=1.015\pm0.051\,R_\oplus$) in a $P=4.02$ day orbit around K2-415 (EPIC 211414619), M5V star at 22 pc. The candidate was first identified by analyzing light curve data K2 mission, and is here shown to exist most recent from TESS. Combining curves with secured our follow-up observations including high-resolution imaging near infrared spectroscopy IRD, we rule out false positive scenarios, finding low probability $2\times...
Bug localization is an important aspect of software maintenance because it can locate modules that should be changed to fix a specific bug. Our previous study showed the accuracy information retrieval (IR)-based bug technique improved when used in combination with code smell information. Although this promise, limited usefulness small number of: 1) projects dataset, 2) types information, and 3) baseline techniques for assessment. This paper presents extension our experiments on Bench4BL,...
Bug localization is a technique that has been proposed to support the process of identifying locations bugs specified in bug report. A traditional approach such as information retrieval (IR)-based calculates similarity between description and source code suggests are likely contain bug. However, while many approaches have improve accuracy, likelihood each module having often overlooked or they treated equally, whereas this may not be case. For example, modules smells found more prone changes...
The Mid-infrared Imager, Spectrometer, Coronagraph (MISC) is one of the instruments studied both for Origins Space Telescope (OST) Mission Concept 1 and 2. MISC OST consists imager spectrometer module (MISC I S), coronagraph COR) transit TRA). S offers (1) a wide field (3 arcminx3 arcmin) imaging low-resolution spectroscopic capability with filters grisms 6-38 μm, (2) medium-resolution (R~1,000) Integral Field Unit (IFU) 5- 38 μm (3) high-resolution (R~25,000) slit 12-18 25-36 μm. COR...
We report the first measurement of zodiacal light (ZL) polarization spectrum in near-infrared between 0.8 and 1.8 $\mu$m. Using low-resolution spectrometer (LRS) on board Cosmic Infrared Background Experiment (CIBER), calibrated for absolute spectrophotometry spectropolarimetry, we acquire long-slit spectral images total diffuse sky brightness towards five fields. To extract ZL spectrum, subtract contribution other radiation, such as galactic (DGL), integrated star (ISL), extragalactic...
This paper demonstrates a cryogenic deformable mirror (DM) with 1020 actuators based on micro-electrical mechanical systems (MEMS) technology. Cryogenic space-borne infrared telescopes can experience wavefront error due to figure of their surface, which makes the imaging performance worse. For on-orbit correction as one solution, we developed MEMS-processed electro-static DM special surrounding structure for use under temperature. We conducted laboratory demonstration its operation in three...
The extragalactic background light (EBL) is the integrated emission from all objects outside of Milky Way galaxy. Imprinted by history stellar emission, EBL in near infrared traces back to birth first stars Universe and can allow tight constraints on structure formation models. Recent studies using data Spitzer Space Telescope Cosmic Infrared Background ExpeRiment (CIBER-1) find that there are excess fluctuations large scales which have been attributed either high redshift galaxies quasars,...
We present the fabrication and experimental demonstration of three free-standing binary shaped pupil mask coronagraphs, which are applicable for telescopes with partially obscured pupils. Three masks, designed to be complementary (labeled Mask-A, Mask-B, Mask-C), were formed in 5 micron thick nickel. The design Mask-A is based on a one-dimensional barcode mask. principle Mask-B similar, but has smaller inner working angle lower contrast than Mask-A. Mask-C concentric ring provides widest...
The extragalactic background light (EBL) is the integrated diffuse emissions from unresolved stars, galaxies, and intergalactic matter along line of sight. EBL regarded as consisting stellar thus an important observational quantity for studying global star formation history throughout cosmic time. Intensity anisotropy in near-infrared measured by Cosmic Infrared Background ExpeRiment (CIBER), NASA's sounding rocket experiment, previous infrared satellites exceed predicted signal galaxy...
The total integrated emission from galaxies, known as the Extragalactic Background Light (EBL), is an important observable for understanding history of star formation over universe. Spatial fluctuations in infrared EBL measured by Cosmic Infrared ExpeRiment (CIBER), Spitzer and AKARI exceed predicted signal galaxy clustering alone. CIBER-2 project seeks to extend CIBER observa- tions throughout near into optical, through measurements above Earth's atmosphere during a suborbital sounding...