Bernie Shiao
A5084198656- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Galaxies: Formation, Evolution, Phenomena
- Gamma-ray bursts and supernovae
- Astro and Planetary Science
- Adaptive optics and wavefront sensing
- Calibration and Measurement Techniques
- CCD and CMOS Imaging Sensors
- Atmospheric Ozone and Climate
- Photocathodes and Microchannel Plates
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Advanced Database Systems and Queries
- Space Exploration and Technology
- Data Management and Algorithms
- Advanced Optical Sensing Technologies
- Geophysics and Gravity Measurements
- Solar and Space Plasma Dynamics
- Digital and Traditional Archives Management
- Software Engineering and Design Patterns
- Power Systems and Technologies
- Infrared Target Detection Methodologies
- Impact of Light on Environment and Health
Space Telescope Science Institute
2013-2023
Michigan Science Center
2011
Pan-STARRS1 has carried out a set of distinct synoptic imaging sky surveys including the $3π$ Steradian Survey and Medium Deep in 5 bands ($grizy_{P1}$). The mean 5$σ$ point source limiting sensitivities stacked 3$π$ $grizy_{P1}$ are (23.3, 23.2, 23.1, 22.3, 21.4) respectively. upper bound on systematic uncertainty photometric calibration across is 7-12 millimag depending bandpass. astrometric using Gaia frame comes from comparison results with Gaia: standard deviation median residuals ($...
Abstract The Galaxy Evolution Explorer ( GALEX ) imaged the sky in two ultraviolet (UV) bands, far-UV (FUV, λ eff ∼ 1528 Å), and near-UV (NUV, 2310 delivering first comprehensive surveys at these wavelengths. database contains FUV NUV images, ∼500 million source measurements over 100,000 low-resolution UV spectra. are a unique resource for statistical studies of hot stellar objects, z ≲ 2 QSOs, star-forming galaxies, nebulae interstellar medium, provide roadmap planning future...
We describe the content and properties of UV source catalogs from GALEX’s All-Sky Imaging Survey (AIS, 5σ depth ≈19.9(FUV)/20.8(NUV) mag, in AB system) Medium-depth (MIS, ≈22.6(FUV)/22.7(NUV) mag), constructed by Bianchi L., et al.: Mon. Not. R. Astron. Soc. (2010, press). The contain 65.3/12.6 million (AIS/MIS) unique sources with photometric error NUV less than 0.5 over 21 435(AIS)/1579(MIS) square degrees. Matched optical data GSC-II provide additional B, R, I photometry for brightest...
In this paper we present a catalog of 4584 eclipsing binaries observed during the first two years (26 sectors) TESS survey. We discuss selection criteria for binary candidates, detection hither-to unknown systems, determination ephemerides, validation and triage process, derivation heuristic estimates ephemerides. Instead keeping to widely used discrete classes, propose star morphology classification based on dimensionality reduction algorithm. Finally, statistical properties sample,...
We investigate the infrared (IR) properties of cool, evolved stars in Small Magellanic Cloud (SMC), including red giant branch (RGB) and dust-producing supergiant (RSG) asymptotic (AGB) using observations from Spitzer Space Telescope Legacy program entitled: "Surveying Agents Galaxy Evolution Tidally-stripped, Low Metallicity SMC", or SAGE-SMC. The survey includes, for first time, full spatial coverage SMC bar, wing, tail regions at wavelengths (3.6 - 160 microns). identify a combination...
The Small Magellanic Cloud (SMC) provides a unique laboratory for the study of lifecycle dust given its low metallicity (~1/5 solar) and relative proximity (~60 kpc). This motivated SAGE-SMC (Surveying Agents Galaxy Evolution in Tidally-Stripped, Low Metallicity Cloud) Spitzer Legacy program with specific goals studying amount type present interstellar medium, sources winds evolved stars, how much is consumed star formation. mapped full SMC (30 sq. deg.) including Body, Wing, Tail 7 bands...
The Galaxy Evolution Explorer (GALEX) has performed the first surveys of sky in Ultraviolet (UV). Its legacy is an unprecedented database with more than 200 million source measurements far-UV (FUV) and near-UV (NUV), as well wide-field imaging extended objects, filling important gap our view across electromagnetic spectrum. UV offer unique sensitivity for identifying studying selected classes astrophysical both stellar extra-galactic. We examine overall content distribution sources over sky,...
Context. In the age of JWST, temperate terrestrial exoplanets transiting nearby late-type M dwarfs provide unique opportunities for characterising their atmospheres, as well searching biosignature gases. this context, benchmark TRAPPIST-1 planetary system has garnered interest a broad scientific community. Aims. We report here discovery and validation two super-Earths LP 890-9 (TOI-4306, SPECULOOS-2), relatively low-activity (32 pc) M6V star. The inner planet, b, was first detected by TESS...
We present a catalog of 5324 massive stars in the Small Magellanic Cloud (SMC), with accurate spectral types compiled from literature, and photometric for subset 3654 these stars, goal exploring their infrared properties. The consists counterparts Spitzer SAGE-SMC survey database, which we uniform photometry 0.3to24 μm UBVIJHKs+IRAC+MIPS24 bands. compare color–magnitude diagrams color–color to those Large (LMC), finding that brightest sources SMC are also red supergiants, supergiant B[e]...
Abstract Young exoplanets can offer insight into the evolution of planetary atmospheres, compositions, and architectures. We present discovery young system TOI 451 (TIC 257605131, Gaia DR2 4844691297067063424). is a member 120 Myr old Pisces–Eridanus stream (Psc–Eri). confirm membership in with its kinematics, lithium abundance, rotation UV excesses both wide-binary companion, B (itself likely an M-dwarf binary). identified three candidate planets transiting Transiting Exoplanet Survey...
The SAGE-Spec Spitzer Legacy program is a spectroscopic follow-up to the SAGE-LMC photometric survey of Large Magellanic Cloud carried out with Space Telescope. We present an overview and some its first results. aims study life cycle gas dust in Cloud, provide information essential classification point sources observed earlier survey. acquired 224.6 hours observations using InfraRed Spectrograph SED mode Multiband Imaging Photometer for Spitzer. data, along archival spectroscopy objects are...
The Spitzer Space Telescope Legacy Program SAGE-SMC allows global studies of resolved stellar populations in the SMC a different environment than our Galaxy. Using IRAC (3.6–8.0 μm) and MIPS (24 70 catalogs images combined with near-infrared (JHKs) optical (UBVI) data, we identified population ∼1000 intermediate- to high-mass young objects (YSOs) (three times more previously known). Our method identifying YSO candidates builds on developed for Large Magellanic Cloud by Whitney et al....
Fundamental parameters and time-evolution of mass loss are investigated for post-main-sequence stars in the Galactic globular cluster 47 Tucanae (NGC 104). This is accomplished by fitting spectral energy distributions (SEDs) to existing optical infrared photometry spectroscopy, produce a true Hertzsprung--Russell diagram. We confirm cluster's distance as 4611 (+213, -200) pc age 12 +/- 1 Gyr. Horizontal branch models appear that no more RGB occurs Tuc than more-metal-poor omega Centauri,...
We present new observations of 34 YSO candidates in the SMC. The anchor analysis is a set Spitzer-IRS spectra, supplemented by groundbased 3-5 micron Spitzer and NIR photometry, optical spectroscopy radio data. sources' SEDs spectral indices are consistent with embedded YSOs; prominent silicate absorption observed spectra at least ten sources, emission towards four sources. PAH detected all but two Based on band ratios (in particular strength 11.3 weakness 8.6 bands) SMC YSOs dominated...
ABSTRACT gPhoton is a new database product and software package that enables analysis of GALEX ultraviolet data at the photon level. The project’s stand-alone, pure-Python calibration pipeline reproduces functionality original mission to reduce raw spacecraft lists time-tagged, sky-projected photons, which are then hosted in publicly available by Mikulski Archive Space Telescope. This contains approximately 130 terabytes describing 1.1 trillion events with timestamp resolution five...
[abridged] We present 52-93 micron spectra obtained with Spitzer in the MIPS-SED mode, of a representative sample luminous compact far-IR sources LMC. These include carbon stars, OH/IR AGB post-AGB objects and PNe, RCrB-type star HV2671, red supergiants WOHG064 IRAS05280-6910, B[e] stars IRAS04530-6916, R66 R126, Wolf-Rayet Brey3a, Luminous Blue Variable R71, supernova remnant N49, large number young stellar objects, HII regions molecular cores, background galaxy (z~0.175). use to constrain...
We report the discovery of an ultrahot Jupiter with extremely short orbital period $0.67247414\,\pm\,0.00000028$ days ($\sim$16 hr). The $1.347 \pm 0.047$ $R_{\rm Jup}$ planet, initially identified by Transiting Exoplanet Survey Satellite (TESS) mission, orbits TOI-2109 (TIC 392476080): a $T_{\rm eff} \sim 6500$ K F-type star mass $1.447 0.077$ $M_{\rm Sun}$, radius $1.698 0.060$ and rotational velocity $v\sin i_* = 81.9 1.7$ km s$^{-1}$. planetary nature TOI-2109b was confirmed through...
The public, all-sky surveys Gaia and TESS provide the ability to identify new young associations determine their ages. These enable study of planetary evolution by providing opportunities discover exoplanets. A association was recently identified Tang et al. F{\"u}rnkranz using astrometry from (called "Group-X" former). In this work, we investigate age membership association; validate exoplanet TOI 2048 b, which transit a young, late G dwarf in Group-X photometry TESS. We first candidate...
We use the Galaxy Evolution Explorer (GALEX) Medium and All-Sky Imaging Survey (MIS AIS) data from first public release (GR1), matched to Sloan Digital Sky (SDSS) DR3 catalog, perform source classification. The GALEX surveys provide photometry in far- near-UV bands SDSS five optical (u, g, r, i, z). GR1/DR3 overlapping areas are 363 (86) deg2 for AIS (MIS), sources within 0.5° central area of fields. Our sample covers mostly |b| > 30° Galactic latitudes. present statistical properties...
We present a detailed study of the Galaxy Evolution Explorer's (GALEX) photometric catalogs with special focus on statistical properties All-sky and Medium Imaging Surveys. introduce concept primaries to resolve issue multiple detections follow geometric approach define clean well understood selection functions. cross-identify GALEX sources (GR2+3) Sloan Digital Sky Survey (SDSS; DR6) observations, which indirectly provides an invaluable insight into astrometric model UV allows us revise...
HII regions are the birth places of stars, and as such they provide best measure current star formation rates (SFRs) in galaxies. The close proximity Magellanic Clouds allows us to probe nature these forming at small spatial scales. We aim determine monochromatic IR band that most accurately traces bolometric flux (TIR), which can then be used estimate an obscured SFR. present analysis, via aperture/annulus photometry, 16 LMC SMC region complexes using Spitzer IRAC MIPS bands. UV rocket data...
We present the first results from Surveying Agents of Galaxy Evolution (SAGE)-Var program, a follow up to Spitzer legacy program SAGE (Meixner et al.). obtained four epochs photometry at 3.6 and 4.5 μm covering bar LMC central region SMC in order probe variability extremely red sources missed by surveys conducted shorter wavelengths, provide additional observation for known variables. Our six total observations allow us infrared (IR) on 15 different timescales ranging ∼20 days ∼5 yr. Out...
We present the discovery of two new 10-day period giant planets from Transiting Exoplanet Survey Satellite ($TESS$) mission, whose masses were precisely determined using a wide diversity ground-based facilities. TOI-481 b and TOI-892 have similar radii ($0.99\pm0.01$ $\rm R_{J}$ $1.07\pm0.02$ R_{J}$, respectively), orbital periods (10.3311 days 10.6266 days, but significantly different ($1.53\pm0.03$ M_{J}$ versus $0.95\pm0.07$ M_{J}$, respectively). Both orbit metal-rich stars ([Fe/H]=...
We investigate dust production and stellar mass loss in the Galactic globular cluster NGC 362. Due to its close proximity Small Magellanic Cloud (SMC), 362 was imaged with Infrared Array Camera Multiband Imaging Photometer cameras onboard Spitzer Space Telescope as part of Surveying Agents Galaxy Evolution (SAGE-SMC) Legacy program. detect several members near tip red giant branch (RGB) that exhibit infrared excesses indicative circumstellar find is not present measurable quantities stars...
Using Spitzer IRAC observations from the SAGE-SMC Legacy program and archived data, we investigate dust production in 47 Tuc, a nearby massive Galactic globular cluster. A previous study detected infrared excess, indicative of circumstellar dust, large population stars spanning entire Red Giant Branch (RGB). We show that those results suffered effects caused by stellar blending imaging artifacts it is likely no below about 1 mag tip RGB are producing dust. The only appear to harbor variable...