Jack J. Lissauer
A5082738869- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Planetary Science and Exploration
- Astronomical Observations and Instrumentation
- Space Exploration and Technology
- Space Science and Extraterrestrial Life
- History and Developments in Astronomy
- Scientific Research and Discoveries
- Spacecraft and Cryogenic Technologies
- Gamma-ray bursts and supernovae
- Astronomical and nuclear sciences
- Solar and Space Plasma Dynamics
- Historical Astronomy and Related Studies
- Geology and Paleoclimatology Research
- Geomagnetism and Paleomagnetism Studies
- High-pressure geophysics and materials
- Geophysics and Gravity Measurements
- Space Satellite Systems and Control
- Atmospheric Ozone and Climate
- Space exploration and regulation
- Spacecraft Dynamics and Control
- Calibration and Measurement Techniques
- Spacecraft Design and Technology
Ames Research Center
2016-2025
Search for Extraterrestrial Intelligence
2005-2022
Universidad de Granada
2022
Stanford University
2010-2021
Center for Astrophysics Harvard & Smithsonian
2006-2014
University of California, Berkeley
1981-2014
Pennsylvania State University
2014
Bay Area Environmental Research Institute
2014
Northwestern University
2014
Harvard University
2011
The Kepler mission was designed to determine the frequency of Earth-sized planets in and near habitable zone Sun-like stars. is region where planetary temperatures are suitable for water exist on a planet's surface. During first 6 weeks observations, monitored 156,000 stars, five new exoplanets with sizes between 0.37 1.6 Jupiter radii orbital periods from 3.2 4.9 days were discovered. density Neptune-sized Kepler-4b similar that Neptune GJ 436b, even though irradiation level 800,000 times...
The Transiting Exoplanet Survey Satellite (TESS) will search for planets transiting bright and nearby stars. TESS has been selected by NASA launch in 2017 as an Astrophysics Explorer mission. spacecraft be placed into a highly elliptical 13.7-day orbit around the Earth. During its two-year mission, employ four wide-field optical CCD cameras to monitor at least 200,000 main-sequence dwarf stars with I = 4-13 temporary drops brightness caused planetary transits. Each star observed interval...
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...
The Transiting Exoplanet Survey Satellite (TESS ) will search for planets transiting bright and nearby stars. TESS has been selected by NASA launch in 2017 as an Astrophysics Explorer mission. spacecraft be placed into a highly elliptical 13.7-day orbit around the Earth. During its two-year mission, employ four wide-field optical CCD cameras to monitor at least 200,000 main-sequence dwarf stars with I<sub>C</sub> (approximately less than) 13 temporary drops brightness caused planetary...
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 Kepler Mission, launched on 2009 March 6, was designed with the explicit capability to detect Earth-size planets in habitable zone of solar-like stars using transit photometry method. Results from just 43 days data along ground-based follow-up observations have identified five new transiting measurements their masses, radii, and orbital periods. Many aspects stellar astrophysics also benefit unique, precise, extended, nearly continuous set for a large number variety stars. Early results...
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.
My life has been an interesting voyage. I became astronomer because could not imagine living on Earth and trying to understand how the Universe works. scientific career revolved around observing motions of stars within galaxies ...Read More
The Kepler mission has discovered more than 2500 exoplanet candidates in the first two years of spacecraft data, with approximately 40% those candidate multi-planet systems. high rate multiplicity combined low identified false positives indicates that multiplanet systems contain very few positive signals due to other not gravitationally bound target star. False are and removed, leaving behind a residual population transiting expected have less 1%. We present sample 340 planetary 851 planets...
Traditional thermal evolution models of giant planets employ arbitrary initial conditions selected more for computational expediency than physical accuracy. Since the are eventually forgotten by evolving planet, this approach is valid mature planets, if not young ones. To explore at ages jovian mass we have employed model created one implementation core-accretion mechanism as evolutionary calculations. The luminosities and early cooling rates highly sensitive to their internal entropies,...
High-precision, high-cadence radial velocity monitoring over the past 8 yr at W. M. Keck Observatory reveals evidence for a third planet orbiting nearby (4.69 pc) dM4 star GJ 876. The residuals of three-body Newtonian fits, which include 876 and Jupiter-mass companions b c, show significant power periodicity 1.9379 days. Self-consistently fitting data with model that includes an additional body this period significantly improves quality fit. These four-body (three-planet) fits find minimum...
We report precise Doppler measurements of GJ 436 (M2.5 V) obtained at Keck Observatory. The velocities reveal a planetary companion with orbital period 2.644 days, eccentricity 0.12 (consistent zero), and velocity semiamplitude K = 18.1 m s-1. minimum mass (M sin i) for the planet is 0.067MJup 1.2MNep 21MEarth, making it lowest exoplanet yet found around main-sequence star first candidate in Neptune-mass domain. (mass 0.41 M☉) only second M dwarf to harbor planet, joining two-planet system...
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...
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....
In the spring of 2009, Kepler Mission commenced high-precision photometry on nearly 156,000 stars to determine frequency and characteristics small exoplanets, conduct a guest observer program, obtain asteroseismic data wide variety stars. On 15 June 2010 released from first quarter observations. At time this publication, 706 set have exoplanet candidates with sizes as that Earth larger than Jupiter. Here we give identity 306 planetary candidates. Data for remaining 400 will be in February...
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...