Chris Smith
A5010238743- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astronomical Observations and Instrumentation
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Star Formation Studies
- Planetary Science and Exploration
- Particle physics theoretical and experimental studies
- Astrophysics and Cosmic Phenomena
- Solar and Space Plasma Dynamics
- Geophysics and Gravity Measurements
- Astrophysical Phenomena and Observations
- Calibration and Measurement Techniques
- Nuclear Issues and Defense
- Adaptive optics and wavefront sensing
- International Science and Diplomacy
- CCD and CMOS Imaging Sensors
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Art, Politics, and Modernism
- Architecture, Modernity, and Design
- Computational Fluid Dynamics and Aerodynamics
- Spectroscopy and Laser Applications
- Fluid Dynamics and Turbulent Flows
The University of Sydney
2009-2024
University of California, Berkeley
1996-2024
University of Pennsylvania
2022
Southern University Law Center
2022
University of Southern California
2022
K Lab (United States)
2018-2020
University of Wyoming
2019
Cerro Tololo Inter-American Observatory
2000-2018
Sierra Lobo (United States)
2018
Faculty of Design
2018
[abridged] We describe the first results from NOAO Outer Limits Survey. The survey consists of deep images 55 0.6x0.6 degree fields at distances up to 20 degrees LMC/SMC, and 10 controls. probe outer structure Clouds, Magellanic Stream, Leading Arm, wake new LMC orbit. Images were taken in 5 filters on CTIO Blanco 4-m Mosaic2 camera, with calibration 0.9-m. CRI reach depths below oldest LMC/SMC main sequence (MS) turnoffs, yielding probes combined ability measure stellar ages metallicities....
We present the star cluster catalogs for 17 dwarf and irregular galaxies in $HST$ Treasury Program "Legacy ExtraGalactic UV Survey" (LEGUS). Cluster identification photometry this subsample are similar to that of entire LEGUS sample, but special methods were developed provide robust with accurate fluxes due low statistics. The colors ages largely consistent two widely used aperture corrections, a significant fraction clusters more compact than average training cluster. However, ensemble...
Abstract TOI-6255 b (GJ 4256) is an Earth-sized planet (1.079 ± 0.065 R ⊕ ) with orbital period of only 5.7 hr. With the newly commissioned Keck Planet Finder and CARMENES spectrographs, we determine planet’s mass to be 1.44 0.14 M . The just outside Roche limit, P orb / = 1.13 0.10. strong tidal force likely deforms into a triaxial ellipsoid long axis that ∼10% longer than short axis. Assuming reduced stellar quality factor <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"...
We measure the weak lensing masses and galaxy distributions of four massive clusters observed during Science Verification phase Dark Energy Survey (DES). This pathfinder study is meant to (1) validate Camera (DECam) imager for task measuring shapes, (2) utilize DECam's large field view map out their environments over 90 arcmin. conduct a series rigorous tests on astrometry, photometry, image quality, point spread function (PSF) modelling, shear measurement accuracy single flaws in data also...
Abstract The degree of alignment between a star’s spin axis and the orbital plane its planets (the stellar obliquity) is related to interesting poorly understood processes that occur during planet formation evolution. Hot Jupiters orbiting hot stars (≳6250 K) display wide range obliquities, while similar cool are preferentially aligned. Tidal dissipation expected be more rapid in with thick convective envelopes, potentially explaining this trend. Evolved provide an opportunity test damping...
Abstract We introduce the OATMEAL survey, an effort to measure obliquities of stars with transiting brown dwarf companions. observed a transit close-in ( P orb = 1.74 days) GPX-1 b using Keck Planet Finder spectrograph sky-projected angle between its orbital axis and spin early F-type host star λ ). measured 6.°9 ± 10.°0, suggesting orbit that is prograde well aligned stellar equator. Hot Jupiters around F are frequently found have highly misaligned orbits, polar retrograde orbits being...
The behavior of a liquid-fuel spray transversely injected into uniform high-speed crossflow has been characterized using laser-sheet imaging technique. dependence jet penetration upon jet-to-crossflow momentum ratio was studied by varying the from 3 to 45. static pressure inside test section varied 14.7 30 psia, while freestream Mach number held constant at 0.4. A detailed comparison trajectories (penetration profiles) measured in this study with those predicted currently available...
We present a forward-modelling simulation framework designed to model the data products from Dark Energy Survey (DES). This forward-model process can be thought of as transfer function -- mapping cosmological and astronomical signals final used by scientists. Using output simulations (the Blind Cosmology Challenge), we generate simulated images Ultra Fast Image Simulator, Berge et al. 2013) catalogs representative DES data. In this work simulate 244 sq. deg coadd in 5 bands for Science...
This paper describes the scientific, technical and political genesis of Large Hadron Collider (LHC). It begins with an outline early history LHC, from first thoughts accelerator detector developments that underwrote project, through studies LHC its scientific potential experimental programme, to presentation proposal build CERN Council in December 1993. The events led two stages, which was approved 1994, are then described. Next, role non-Member State contributions agreement could take...
We present the first asteroseismic analysis of K3\,V planet host HD~219134, based on four consecutive nights radial velocities collected with Keck Planet Finder. applied Gold deconvolution to power spectrum disentangle modes from sidelobes in spectral window, and extracted 25 mode frequencies spherical degrees $0\leq\ell\leq3$. derive fundamental properties using five different evolutionary-modeling pipelines report a mass 0.763 $\pm$ 0.020 (stat) 0.007 (sys) M$_\odot$, radius 0.748 0.002...
Abstract We present the first asteroseismic analysis of K3 V planet host HD 219134 based on four consecutive nights radial velocities collected with Keck Planet Finder. apply Gold deconvolution to power spectrum disentangle modes from side lobes in spectral window and extract 25 mode frequencies spherical degrees 0 ≤ ℓ 3. derive fundamental properties using five different evolutionary-modeling pipelines report a mass 0.763 ± 0.020 (stat) 0.007 (sys) M ⊙ , radius 0.748 0.002 R an age 10.151...
The Keck Planet Finder (KPF) is a fiber-fed, high-resolution, high-stability spectrometer in development for the W.M. Observatory. instrument recently passed its preliminary design review and currently detailed phase. KPF designed to characterize exoplanets using Doppler spectroscopy with single measurement precision of 0.5 m s<sup>−1</sup> or better; however, resolution stability will enable wide variety other astrophysical pursuits. have 200 mm collimated beam diameter resolving power...
The preparation of some derivatives benzo-15-crown-5 is described, each containing a carbohydrate moiety attached through either an ester or ether linkage. ion-extraction properties into dichloromethane these and other related towards lithium, sodium, potassium picrate in aqueous solution have been measured, together with their ability to transport the alkalimetal picrates membrane.
The promise, status and challenges of developing fusion power are outlined. key physics engineering principles described recent progress quantified. As the successful demonstration 16 MW in 1997 Joint European Torus showed, works. central issue is therefore to make it work reliably economically on scale a station. We argue that meet this challenge 30 years we must follow aggressive programme known as 'Fast Track Fusion'. This some detail.
We present spectroscopic and photometric observations of SN 1992ar, the most distant supernova (SN) in Calán/Tololo Survey. compare its spectrum with those nearby Type Ia Ic SNe conclude that latter type is a better match to 1992ar. Using K-corrections based on spectra well-observed SNe, we compute different possible rest-frame light curves 1992ar them representative each observed universe. From photometry spectra, are able cannot be matched by any known example SN. Even though data set...
Abstract We present a multi-band photometric catalog of ≈1.7 million cluster members for field view ≈2° × 2° across ω Cen. Photometry is based on images collected with the Dark Energy Camera 4 m Blanco telescope and Advanced Surveys Hubble Space Telescope . The unprecedented accuracy coverage allowed us, first time, to investigate spatial distribution Cen multiple populations from core tidal radius, confirming its very complex structure. found that frequency blue main-sequence stars...
We present a study of the Type Ic supernova (SN) 1990B that includes most observations obtained from around world. The combined data set comprises 84 BV(RI)c photometric points spanning approximately 360 days after maximum light and 14 spectra 5 up to ~150 light. In contrast other SNe, SN did not display weak but distinct He I λ5876 line indicating its content was smaller or layers were rather effectively shielded radioactive matter in ejecta. behavior Na D line, however, suggests blended...
The Keck Planet Finder (KPF) is a fiber-fed, high-resolution, high-stability spectrometer in development at the UC Berkeley Space Sciences Laboratory for W.M. Observatory. KPF designed to characterize exoplanets via Doppler spectroscopy with goal of single measurement precision 0.3 m s<sup>-1</sup> or better, however its resolution and stability will enable wide variety astrophysical pursuits. Here we provide post-preliminary design review updates several subsystems, including: main...
Gaussian mixture model (GMM) has been used in many applications for dynamic state estimation such as target tracking or distributed fusion. However, the number of components distribution tends to grow rapidly when multiple GMMs are combined. In order keep computational complexity bounded, it is necessary approximate a by one with reduced components. reduction traditionally conducted recursively selecting two that appear be most similar each other and merging them. Different definitions on...