Daniel C. Fabrycky
A5023489964- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- History and Developments in Astronomy
- Space Exploration and Technology
- Gamma-ray bursts and supernovae
- Planetary Science and Exploration
- Scientific Research and Discoveries
- Astronomical and nuclear sciences
- Solar and Space Plasma Dynamics
- Astrophysical Phenomena and Observations
- Geophysics and Gravity Measurements
- Historical Astronomy and Related Studies
- Calibration and Measurement Techniques
- Spacecraft Design and Technology
- Space Science and Extraterrestrial Life
- Spacecraft Dynamics and Control
- Space Satellite Systems and Control
- High-pressure geophysics and materials
- Adaptive optics and wavefront sensing
- Advanced Frequency and Time Standards
- Nuclear physics research studies
- Advanced Thermodynamic Systems and Engines
University of Chicago
2015-2024
University of California, Santa Cruz
2010-2014
Canadian Institute for Theoretical Astrophysics
2014
Center for Astrophysics Harvard & Smithsonian
2008-2012
Chr. Michelsen Institute
2008-2010
Harvard University
2010
Princeton University
2005-2007
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...
At least two arguments suggest that the orbits of a large fraction binary stars and extrasolar planets shrank by 1-2 orders magnitude after formation: (1) physical radius star shrinks factor from birth to main sequence, yet many main-sequence have companions orbiting only few stellar radii away, (2) in current theories planet formation, region within ~0.1 AU protostar is too hot rarefied for Jupiter-mass form, "hot Jupiters" are observed at such distances. We investigate orbital shrinkage...
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 basic geometry of the Solar System -- shapes, spacings, and orientations planetary orbits has long been a subject fascination as well inspiration for planet formation theories. For exoplanetary systems, those same properties have only recently come into focus. Here we review our current knowledge occurrence planets around other stars, their orbital distances eccentricities, spacings mutual inclinations in multiplanet orientation host star's rotation axis, binary-star systems.
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 show that stars with transiting planets for which the stellar obliquity is large are preferentially hot (T_eff > 6250 K). This could explain why small obliquities were observed in earliest measurements, focused on relatively cool drawn from Doppler surveys, as opposed to hotter emerged later transit surveys. The trend be due differences planet formation and migration around of varying mass. Alternatively, we speculate hot-Jupiter systems begin a wide range obliquities, but photospheres...
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...
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 Mission provides nearly continuous monitoring of ~156 000 objects with unprecedented photometric precision. Coincident the first data release, we presented a catalog 1879 eclipsing binary systems identified within 115 square degree FOV. Here, provide an updated augmented second release which increases baseline 4-fold to 125 days. 386 new have been added, ephemerides and principle parameters recomputed. We removed 42 previously cataloged that are now clearly recognized as...
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 We present a statistical analysis of the first 300 stars observed by Gemini Planet Imager Exoplanet Survey. This subsample includes six detected planets and three brown dwarfs; from these detections our contrast curves we infer underlying distributions substellar companions with respect to their mass, semimajor axis, host stellar mass. uncover strong correlation between planet occurrence rate star M * > 1.5 ⊙ more likely masses 2 13 Jup axes 3–100 au at 99.92% confidence. fit...
An exoplanet extracted from the bright Direct imaging of Jupiter-like exoplanets around young stars provides a glimpse into how our solar system formed. The brightness requires use next-generation devices such as Gemini Planet Imager (GPI). Using GPI, Macintosh et al. discovered planet orbiting star, 51 Eridani (see Perspective by Mawet). planet, Eri b, has methane signature and is probably smallest that been directly imaged. These findings open door to understanding origins herald dawn new...
In the Solar system planets' compositions vary with orbital distance, rocky planets in close orbits and lower-density gas giants wider orbits. The detection of close-in giant around other stars was first clue that this pattern is not universal, can change substantially after their formation. Here we report another violation orbit-composition pattern: two orbiting same star distances differing by only 10%, densities a factor 8. One planet likely `super-Earth', whereas more akin to Neptune....
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...
Radial velocity measurements of stellar reflex motion have revealed many extrasolar planets, but gaps in the observations produce aliases, spurious frequencies that are frequently confused with planets' orbital frequencies. In case Gl 581 d, distinction between an alias and true frequency was a frozen, dead planet possibly hospitable to life (Udry et al. 2007; Mayor 2009). To improve characterization planetary systems, we describe how aliases originate present new approach for distinguishing...
We measure the mass of a modestly irradiated giant planet, KOI-94d. wish to determine whether this which is in 22-day orbit and receives 2700 times as much incident flux Jupiter, dense Jupiter or rarefied like inflated hot Jupiters. KOI-94 also hosts 3 smaller transiting planets, all were detected by Kepler Mission. With 26 radial velocities from W. M. Keck Observatory simultaneous fit light curve, we planet that it not inflated. Support for planetary interpretation other three candidates...
Misaligned Planets Stars with multiple coplanar planets have not been seen to show misalignments between the equatorial plane of star and orbital planets—a diagnostic dynamical history planetary systems. Huber et al. (p. 331 ) analyzed Kepler 56 system, which contains a giant-sized an intermediate-sized planet. The orbits that are close coplanar, but misaligned stellar equator. A third companion in wide orbit, could be another or planet, explain configuration.
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...
Over the duration of Kepler mission, KIC8462852 was observed to undergo irregularly shaped, aperiodic dips in flux up $\sim 20$\%. The dipping activity can last for between 5 and 80 days. We characterize object with high-resolution spectroscopy, spectral energy distribution fitting, radial velocity measurements, imaging, Fourier analyses light curve. determine that is a typical main-sequence F3 V star exhibits no significant IR excess, has very close interacting companions. In this paper, we...
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,...