Jeffrey C. Smith
A5068127095- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Particle Accelerators and Free-Electron Lasers
- Astronomical Observations and Instrumentation
- Particle accelerators and beam dynamics
- Gamma-ray bursts and supernovae
- Particle Detector Development and Performance
- Superconducting Materials and Applications
- CCD and CMOS Imaging Sensors
- Calibration and Measurement Techniques
- Radiation Therapy and Dosimetry
- Solar and Space Plasma Dynamics
- Blind Source Separation Techniques
- Lightning and Electromagnetic Phenomena
- Interconnection Networks and Systems
- Spacecraft and Cryogenic Technologies
- Astronomical and nuclear sciences
- Space Exploration and Technology
- Radiation Detection and Scintillator Technologies
- Scientific Measurement and Uncertainty Evaluation
- History and Developments in Astronomy
- Spectroscopy and Chemometric Analyses
- Magnetic confinement fusion research
Ames Research Center
2013-2023
Search for Extraterrestrial Intelligence
2014-2023
Cardiff Metropolitan University
2023
Tech-X (United Kingdom)
2022
University of St. Thomas - Minnesota
2016-2017
Stanford University
2009-2011
Menlo School
2011
SLAC National Accelerator Laboratory
2011
Stanford Synchrotron Radiation Lightsource
2011
Cornell University
1980-2007
New transiting planet candidates are identified in 16 months (2009 May-2010 September) of data from the Kepler spacecraft.Nearly 5000 periodic transit-like signals vetted against astrophysical and instrumental false positives yielding 1108 viable new candidates, bringing total count up to over 2300.Improved vetting metrics employed, contributing higher catalog reliability.Most notable is noise-weighted robust averaging multiquarter photo-center offsets derived difference image analysis that...
The Transiting Exoplanet Survey Satellite (TESS) will conduct a search for Earth's closest cousins starting in early 2018 and is expected to discover ∼1,000 small planets with R<sub>p</sub> < 4 R<sub>⊕</sub> measure the masses of at least 50 these worlds. Science Processing Operations Center (SPOC) being developed NASA Ames Research based on Kepler science pipeline generate calibrated pixels light curves Advanced Supercomputing Division's Pleiades supercomputer. SPOC also...
We report the distribution of planets as a function planet radius (R_p), orbital period (P), and stellar effective temperature (Teff) for P < 50 day orbits around GK stars. These results are based on 1,235 (formally "planet candidates") from Kepler mission that include nearly complete set detected small 2 Earth radii (Re). For each 156,000 target stars we assess detectability R_p P. also correct geometric probability transit, R*/a. consider first within "solar subset" having Teff = 4100-6100...
Kepler provides light curves of 156,000 stars with unprecedented precision. However, the raw data as they come from spacecraft contain significant systematic and stochastic errors. These errors, which include discontinuities, trends, outliers, obscure astrophysical signals in curves. To correct these errors is task Presearch Data Conditioning (PDC) module analysis pipeline. The original version PDC did not meet extremely high performance requirements for detection miniscule planet transits...
The previous presearch data conditioning algorithm, PDC-MAP, for the Kepler processing pipeline performs very well majority of targets in field view. However, an appreciable minority, PDC-MAP has its limitations. To further minimize number which fails to perform admirably, we have developed a new method, called multiscale MAP, or msMAP. Utilizing overcomplete discrete wavelet transform, method divides each light curve into multiple channels, bands. curves band are then corrected separately,...
We report on the orbital architectures of Kepler systems having multiple-planet candidates identified in analysis data from first six quarters and reported by Batalha et al. (2013). These show 899 transiting planet 365 provide a powerful means to study statistical properties planetary systems. Using generic mass–radius relationship, we find that only two pairs planets these candidate (out 761 total) appear be Hill-unstable orbits, indicating ∼96% are correctly interpreted as true little...
With the unprecedented photometric precision of Kepler Spacecraft, significant systematic and stochastic errors on transit signal levels are observable in data. These errors, which include discontinuities, outliers, trends other instrumental signatures, obscure astrophysical signals. The Presearch Data Conditioning (PDC) module data analysis pipeline tries to remove these while preserving planet transits astrophysically interesting completely new noise stellar variability regime observed...
We present 2,241 exoplanet candidates identified with data from the Transiting Exoplanet Survey Satellite (TESS) during its two-year prime mission. list these in TESS Objects of Interest (TOI) Catalog, which includes both new planet found by and previously-known planets recovered observations. describe process used to identify TOIs investigate characteristics candidates, discuss some notable discoveries. The TOI Catalog an unprecedented number small around nearby bright stars, are...
\We present the sixth catalog of Kepler candidate planets based on nearly 4 years high precision photometry. This builds legacy previous catalogs released by project and includes 1493 new Objects Interest (KOIs) which 554 are planet candidates, 131 these candidates have best fit radii <1.5 R_earth. brings total number KOIs to 7305 4173 respectively. We suspect that many at low signal-to-noise limit may be false alarms created instrumental noise, discuss our efforts identify such objects....
ABSTRACT We present the seventh Kepler planet candidate (PC) catalog, which is first catalog to be based on entire, uniformly processed 48-month data set. This fully automated employing robotic vetting procedures evaluate every periodic signal detected by Q1–Q17 Data Release 24 (DR24) pipeline. While we prioritize uniform over absolute correctness of individual objects, find that our overall comparable to, and in most cases superior human employed past catalogs. utilize artificial transit...
We present the Kepler Object of Interest (KOI) catalog transiting exoplanets based on searching four years time series photometry (Data Release 25, Q1-Q17). The contains 8054 KOIs which 4034 are planet candidates with periods between 0.25 and 632 days. Of these candidates, 219 new in this include two multi-planet systems (KOI-82.06 KOI-2926.05), ten high-reliability, terrestrial-size, habitable zone candidates. This was created using a tool called Robovetter automatically vets DR25 Threshold...
The Kepler mission discovered 2842 exoplanet candidates with 2 years of data. We provide updates to the planet candidate sample based upon 3 (Q1-Q12) Through a series tests exclude false-positives, primarily caused by eclipsing binary stars and instrumental systematics, 855 additional planetary have been discovered, bringing total number known 3697. revised transit parameters accompanying posterior distributions on Markov Chain Monte Carlo algorithm for cumulative catalogue Objects Interest....
Abstract The Kepler mission is providing photometric data of exquisite quality for the asteroseismic study different classes pulsating stars. These analyses place particular demands on pre-processing data, over a range time-scales from minutes to months. Here, we describe processing procedures developed by Asteroseismic Science Consortium prepare light curves that are optimized solar-like oscillating stars in which outliers, jumps and drifts corrected.
We present initial results on some of the properties open clusters NGC 6791 and 6819 derived from asteroseismic data obtained by NASA's Kepler mission. In addition to estimating mass, radius log g stars red-giant branch these clusters, we estimate distance their ages. Our model-independent modulus is (m-M)_0= 13.11\pm 0.06. find 11.85\pm 0.05 for 6819. The average mass 1.20 \pm 0.01 M_sun, while that 1.68\pm 0.03M_sun. It should be noted do not have cover entire actual will somewhat lower....
We present the discovery of Kepler-20 planetary system, which we initially identified through detection five distinct periodic transit signals in Kepler light curve host star 2MASS J19104752+4220194. From high-resolution spectroscopy star, find a stellar effective temperature Teff = 5455 ± 100 K, metallicity [Fe/H] 0.01 0.04, and surface gravity log g 4.4 0.1. combine these estimates with an estimate density derived from curves to deduce mass M⋆ 0.912 0.034 M☉ radius R⋆ 0.944+0.060−0.095 R☉....
We use the KOI-13 transiting star–planet system as a test case for recently developed BEER algorithm, aimed at identifying non-transiting low-mass companions by detecting photometric variability induced companion along its orbit. Such is generated three mechanisms: beaming effect, tidal ellipsoidal distortion, and reflection/heating. data from Kepler quarters, first year of mission, while ignoring measurements within transit occultation, show that planet's ephemeris clearly detected. fit...
The Kepler planet sample can only be used to reconstruct the underlying occurrence rate if detection efficiency of pipeline is known; here we present results a second experiment aimed at characterizing this efficiency. We inject simulated transiting signals into pixel data ∼10,000 targets, spanning one year observations, and process pixels as normal. compare set detections made by with expectation from planets, construct sensitivity curve signal recovery function signal-to-noise transit...
Abstract We report the detection of a transiting planet around π Men (HD 39091), using data from Transiting Exoplanet Survey Satellite ( TESS ). The solar-type host star is unusually bright V = 5.7) and was already known to Jovian on highly eccentric, 5.7 yr orbit. newly discovered has size 2.04 ± 0.05 R ⊕ an orbital period 6.27 days. Radial-velocity High-Accuracy Planet Searcher Anglo-Australian Telescope/University College London Echelle Spectrograph archives also displays day periodicity,...
We present results of the final Kepler Data Processing Pipeline search for transiting planet signals in full 17-quarter primary mission data set. The includes a total 198,709 stellar targets, which 112,046 were observed all 17 quarters and 86,663 fewer than quarters. report on 17,230 targets at least one transit signature is identified that meets specified detection criteria: periodicity, minimum three events, statistic (i.e., signal-to-noise ratio) excess threshold, passing grade...
Abstract We present the discovery and validation of a three-planet system orbiting nearby (31.1 pc) M2 dwarf star TOI-700 (TIC 150428135). lies in TESS continuous viewing zone Southern Ecliptic Hemisphere; observations spanning 11 sectors reveal three planets with radii ranging from 1 R ⊕ to 2.6 orbital periods 9.98 37.43 days. Ground-based follow-up combined diagnostic vetting tests enables us rule out common astrophysical false-positive scenarios validate planets. The outermost planet, d,...
Abstract We report the delivery to Mikulski Archive for Space Telescopes of target pixel and light curve files up 160,000 targets selected from full-frame images (FFI) each TESS Northern hemisphere observing sector. The data include calibrated pixels, simple aperture photometry flux time series, presearch conditioning corrected series. These provide users with high quality, uniform pipeline products a selection FFI targets, that would otherwise not be readily available. Additionally, we...
We report the detection of first circumbinary planet found by TESS. The target, a known eclipsing binary, was observed in sectors 1 through 12 at 30-minute cadence and 4 two-minute cadence. It consists two stars with masses 1.1 MSun 0.3 on slightly eccentric (0.16), 14.6-day orbit, producing prominent primary eclipses shallow secondary eclipses. has radius ~6.9 REarth to make three transits across star roughly equal depths (~0.2%) but different durations -- common signature transiting...
Abstract The Kepler and Transiting Exoplanet Survey Satellite (TESS) missions have generated over 100,000 potential transit signals that must be processed in order to create a catalog of planet candidates. During the past few years, there has been growing interest using machine learning analyze these data search new exoplanets. Different from existing works, ExoMiner , proposed deep classifier this work, mimics how domain experts examine diagnostic tests vet signal. is highly accurate,...
We present the results of a search for potential transit signals in first three quarters photometry data acquired by Kepler Mission. The targets include 151,722 stars which were observed over full interval and an additional 19,132 only 1 or 2 quarters. From this set we find total 5,392 detections meet detection criteria: those criteria are periodicity signal, acceptable signal-to-noise ratio, composition test rejects spurious contain non-physical combinations events. detected dominated...