Darin Ragozzine
A5029179877- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Planetary Science and Exploration
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- History and Developments in Astronomy
- Geomagnetism and Paleomagnetism Studies
- Scientific Research and Discoveries
- Historical Astronomy and Related Studies
- Astronomical and nuclear sciences
- Space Satellite Systems and Control
- Cassava research and cyanide
- Space Exploration and Technology
- Space Science and Extraterrestrial Life
- Spacecraft Design and Technology
- Neurological diseases and metabolism
- Solar and Space Plasma Dynamics
- Isotope Analysis in Ecology
- Geophysics and Gravity Measurements
- Spacecraft Dynamics and Control
- Scientific Computing and Data Management
- Adaptive optics and wavefront sensing
- Historical and Architectural Studies
Brigham Young University
2016-2024
Florida Institute of Technology
2014-2018
Center for Astrophysics Harvard & Smithsonian
2010-2016
University of Florida
2012-2016
Harvard University
2011-2013
Florida Museum of Natural History
2013
Harvard University Press
2011-2012
Smithsonian Astrophysical Observatory
2012
California Institute of Technology
2007-2010
Zero to Three
2009
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...
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.
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...
NASA's Kepler Mission uses transit photometry to determine the frequency of earth-size planets in or near habitable zone Sun-like stars. The mission reached a milestone toward meeting that goal: discovery its first rocky planet, Kepler-10b. Two distinct sets events were detected: 1) 152 +/- 4 ppm dimming lasting 1.811 0.024 hours with ephemeris T[BJD]=2454964.57375+N*0.837495 days and 2) 376 9 6.86 0.07 T[BJD]=2454971.6761+N*45.29485 days. Statistical tests on photometric pixel flux time...
The Kepler spacecraft is monitoring more than 150,000 stars for evidence of planets transiting those stars. We report the detection two Saturn-size that transit same Sun-like star, based on 7 months observations. Their 19.2- and 38.9-day periods are presently increasing decreasing at respective average rates 4 39 minutes per orbit; in addition, times inner body display an alternating variation smaller amplitude. These signatures characteristic gravitational interaction near a 2:1 orbital...
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...
Light curves from the Kepler Mission contain valuable information on nature of phenomena producing transit-like signals. To assist in exploring possibility that they are due to an astrophysical false positive, we describe a procedure (BLENDER) model photometry terms "blend" rather than planet orbiting star. A blend may consist background or foreground eclipsing binary (or star-planet pair) whose eclipses attenuated by light candidate and possibly other stars within photometric aperture. We...
We present a statistical analysis that demonstrates the overwhelming majority of Kepler candidate multiple transiting systems (multis) indeed represent true, physically associated planets. Binary stars provide primary source false positives among planet candidates, implying should be nearly randomly distributed targets. In contrast, true planets would appear clustered around smaller number targets if detectable tend to come in and/or orbital planes encircling same star are correlated. There...
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...
The Kepler spacecraft has been monitoring the light from 150,000 stars in its primary quest to detect transiting exoplanets. Here we report on detection of an eclipsing stellar hierarchical triple, identified photometry. KOI-126 (A,(B, C)), is composed a low-mass binary (masses M_B = 0.2413+/-0.0030 M_Sun, M_C 0.2127+/-0.0026 M_Sun; radii R_B 0.2543+/-0.0014 R_Sun, R_C 0.2318+/-0.0013 R_Sun; orbital period P_1 1.76713+/-0.00019 days) eccentric orbit about third star (mass M_A 1.347+/-0.032...
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...
We present the results of a search for planetary companions orbiting near hot Jupiter planet candidates (Jupiter-size with orbital periods 3 d) identified in Kepler data through its sixth quarter science operations. Special emphasis is given to between 2∶1 interior and exterior mean-motion resonances. A photometric transit excludes sizes ranging from roughly two-thirds five times size Earth, depending upon noise properties target star. dynamically induced deviations constant period (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 chemical composition of stars hosting small exoplanets (with radii less than four Earth radii) appears to be more diverse that gas-giant hosts, which tend metal-rich. This implies small, including Earth-size, planets may have readily formed at earlier epochs in the Universe's history when metals were scarce. We report Kepler spacecraft observations Kepler-444, a metal-poor Sun-like star from old population Galactic thick disk and host compact system five transiting with sizes between...
Abstract We characterize the occurrence rate of planets, ranging in size from 0.5 to 16 R ⊕ , orbiting FGK stars with orbital periods 500 days. Our analysis is based on results “DR25” catalog planet candidates produced by NASA’s Kepler mission and stellar radii Gaia “DR2.” incorporate additional data products accurately efficiency planets being recognized as “threshold crossing events” ’s Transiting Planet Search pipeline labeled robovetter. Using a hierarchical Bayesian model, we derive...
We provide updates to theKepler 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 the pixel-level data, which allows background eclipsing binaries be through small image position shifts during transit. also re-evaluate Kepler...