Avi Shporer
A5064326052- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- History and Developments in Astronomy
- Solar and Space Plasma Dynamics
- Calibration and Measurement Techniques
- Adaptive optics and wavefront sensing
- Space Exploration and Technology
- Atmospheric Ozone and Climate
- Galaxies: Formation, Evolution, Phenomena
- Astronomical and nuclear sciences
- Scientific Research and Discoveries
- Computational Physics and Python Applications
- Spectroscopy and Laser Applications
- Distributed and Parallel Computing Systems
- CCD and CMOS Imaging Sensors
- Geophysics and Gravity Measurements
- Spacecraft and Cryogenic Technologies
- Astrophysics and Cosmic Phenomena
- Spaceflight effects on biology
- High-pressure geophysics and materials
Massachusetts Institute of Technology
2018-2024
Nicolaus Copernicus University
2024
University College London
2022
Kavli Institute for Particle Astrophysics and Cosmology
2018-2021
Vassar College
2020-2021
California Institute of Technology
2012-2019
Jet Propulsion Laboratory
2014-2018
Max Planck Institute for Astronomy
2018
Max Planck Society
2018
Saga University
2016
On 2011 February 1 the Kepler mission released data for 156,453 stars observed from beginning of science observations on 2009 May 2 through September 16. There are 1235 planetary candidates with transit-like signatures detected in this period. These associated 997 host stars. Distributions characteristics separated into five class sizes: 68 approximately Earth-size (Rp < 1.25 R⊕), 288 super-Earth-size (1.25 R⊕ ⩽ Rp 662 Neptune-size (2 6 165 Jupiter-size (6 15 and 19 up to twice size Jupiter...
Las Cumbres Observatory Global Telescope (LCOGT) is a young organization dedicated to time-domain observations at optical and (potentially) near-IR wavelengths. To this end, LCOGT constructing worldwide network of telescopes, including the two 2 m Faulkes as many 17 × 1 23 40 cm telescopes. These telescopes initially will be outfitted for imaging (excepting telescopes) spectroscopy wavelengths between atmospheric UV cutoff roughly 1-μm limit silicon detectors. Since first LCOGT's are now...
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...
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...
About one-third of the ∼1200 transiting planet candidates detected in first four months Kepler data are members multiple candidate systems. There 115 target stars with two planets, 45 three, 8 four, and 1 each five six. We characterize dynamical properties these multi-planet The distribution observed period ratios shows that vast majority pairs neither nor near low-order mean-motion resonances. Nonetheless, there small but statistically significant excesses both resonance spaced slightly too...
We report the detection of a planet whose orbit surrounds pair low-mass stars. Data from Kepler spacecraft reveal transits across both stars, in addition to mutual eclipses giving precise constraints on absolute dimensions all three bodies. The is comparable Saturn mass and size, nearly circular 229-day around its two parent eclipsing stars are 20% 69% as massive sun, have an eccentric 41-day orbit. motions bodies confined within 0.5 degree single plane, suggesting that formed circumbinary disk.
<i>Aims. <i/>We report the discovery of very shallow (), periodic dips in light curve an active G9V star observed by CoRoT satellite, which we interpret as caused a transiting companion. We describe 3-colour data and complementary ground-based observations that support planetary nature companion.<i>Methods. used colours information, good angular resolution photometric in- out- transit, adaptive optics imaging, near-infrared spectroscopy, preliminary results from radial velocity measurements,...
We report on the masses, sizes, and orbits of planets orbiting 22 Kepler stars. There are 49 planet candidates around these stars, including 42 detected through transits 7 revealed by precise Doppler measurements host Based an analysis brightness measurements, along with high-resolution imaging spectroscopy, (for 11 stars) asteroseismology, we establish low false-positive probabilities (FPPs) for all transiting (41 have FPP under 1%), constrain their sizes masses. Most smaller than three...
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...
We present Hubble Space Telescope optical and near-ultraviolet transmission spectra of the transiting hot-Jupiter HD189733b, taken with repaired Imaging Spectrograph (STIS) instrument. The resulting cover range 2900-5700 Ang reach per-exposure signal-to-noise levels greater than 11,000 within a 500 bandwidth. used time series obtained during two transit events to determine wavelength dependance planetary radius measure exoplanet's atmospheric spectrum for first over this range. Our...
ABSTRACT The primary Kepler Mission provided nearly continuous monitoring of ∼200,000 objects with unprecedented photometric precision. We present the final catalog eclipsing binary systems within 105 deg 2 field view. This release incorporates full extent data from mission (Q0-Q17 Data Release). As a result, new have been added, additional false positives removed, ephemerides and principal parameters recomputed, classifications revised to rely on analytical models, eclipse timing variations...
We report the detection of Kepler-47, a system consisting two planets orbiting around an eclipsing pair stars. The inner and outer have radii 3.0 4.6 times that Earth, respectively. binary star consists Sun-like companion roughly one-third its size, each other every 7.45 days. With orbital period 49.5 days, eighteen transits planet been observed, allowing detailed characterization orbit those planet's is 303.2 although not Earth-like, it resides within classical "habitable zone", where...
We present the first measurement of planet frequency beyond "snow line," for planet-to-star mass-ratio interval −4.5 < log q −2, corresponding to range ice giants gas giants. find at mean mass ratio = 5 × 10−4 with no discernible deviation from a flat (Öpik's law) distribution in log-projected separation s. The determination is based on sample six planets detected intensive follow-up observations high-magnification (A>200) microlensing events during 2005–2008. sampled host stars have typical...
This article summarizes a workshop held on March, 2014, the potential of James Webb Space Telescope (JWST) to revolutionize our knowledge physical properties exoplanets through transit observations. JWST's unique combination high sensitivity and broad wavelength coverage will enable accurate measurement transits with signal-to-noise ratio (S/N). Most importantly, JWST spectroscopy investigate planetary atmospheres determine atomic molecular compositions, probe vertical horizontal structure,...
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...
A search of the time-series photometry from NASA's Kepler spacecraft reveals a transiting planet candidate orbiting 11th magnitude G5 dwarf KIC 10593626 with period 290 days. The characteristics host star are well constrained by high-resolution spectroscopy combined an asteroseismic analysis photometry, leading to estimated mass and radius 0.970 ± 0.060 M☉ 0.979 0.020 R☉. depth 492 10 ppm for three observed transits yields 2.38 0.13 Re planet. system passes battery tests false positives,...
We present the detection of five planets -- Kepler-62b, c, d, e, and f size 1.31, 0.54, 1.95, 1.61 1.41 Earth radii, orbiting a K2V star at periods 5.7, 12.4, 18.2, 122.4 267.3 days, respectively. The outermost (Kepler-62e & -62f) are super-Earth-size (1.25 < planet radius/earth radius 2.0) in habitable zone (HZ) their host star, receiving 1.2 +- 0.2 0.41 0.05 times solar flux Earth's orbit. Theoretical models Kepler-62e -62f for stellar age ~7 Gyr suggest that both could be solid: either...
We provide updates to the Kepler planet candidate sample based upon nearly two years of high-precision photometry (i.e., Q1–Q8). From an initial list 13,400 threshold crossing events, 480 new host stars are identified from their flux time series as consistent with hosting transiting planets. Potential transit signals subjected further analysis using pixel-level data, which allows background eclipsing binaries be through small image position shifts during transit. also re-evaluate Objects...
Eighty planetary systems of two or more planets are known to orbit stars other than the Sun. For most, data can be sufficiently explained by non-interacting Keplerian orbits, so dynamical interactions these have not been observed. Here we present 4 sets lightcurves from Kepler spacecraft, which each show multiple transiting same star. Departure timing transits strict periodicity indicates perturbing other: observed variations match forcing frequency planet. This confirms that objects in...
We discuss the discovery and characterization of circumbinary planet Kepler-38b. The stellar binary is single-lined, with a period 18.8 days, consists moderately evolved main-sequence star (M_A = 0.949 +/- 0.059 solar masses R_A 1.757 0.034 radii) paired low-mass (M_B 0.249 0.010 R_B 0.2724 0.0053 in mildly eccentric (e=0.103) orbit. A total eight transits due to crossing primary were identified Kepler light curve (using Quarters 1 through 11), from which planetary 105.595 0.053 days can be...