The population of long-period transiting exoplanets

Abstract

The Kepler Mission has discovered thousands of exoplanets and revolutionized our understanding of their population. This large, homogeneous catalog of discoveries has enabled rigorous studies of the occurrence rate of exoplanets and planetary systems as a function of their physical properties. However, transit surveys like Kepler are most sensitive to planets with orbital periods much shorter than the orbital periods of Jupiter and Saturn, the most massive planets in our Solar System. To address this deficiency, we perform a fully automated search for long-period exoplanets with only one or two transits in the archival Kepler light curves. When applied to the $\sim 40,000$ brightest Sun-like target stars, this search produces 16 long-period exoplanet candidates. Of these candidates, 6 are novel discoveries and 5 are in systems with inner short-period transiting planets. Since our method involves no human intervention, we empirically characterize the detection efficiency of our search. Based on these results, we measure the average occurrence rate of exoplanets smaller than Jupiter with orbital periods in the range 2-25 years to be $2.0\pm 0.7$ planets per Sun-like star.

arXiv commentAccepted for publication in AJ

References in corpus (67)

• emcee: The MCMC Hammer
• The NumPy array: a structure for efficient numerical computation
• The Transiting Exoplanet Survey Satellite
• Analytic Lightcurves for Planetary Transit Searches
• The K2 Mission: Characterization and Early results
• The PLATO 2.0 Mission
• Planet Occurrence within 0.25 AU of Solar-type Stars from Kepler
• batman: BAsic Transit Model cAlculatioN in Python
• Characteristics of planetary candidates observed by Kepler, II: Analysis of the first four months of data
• Kepler Presearch Data Conditioning II - A Bayesian Approach to Systematic Error Correction
• A box-fitting algorithm in the search for periodic transits
• The Keck Planet Search: Detectability and the Minimum Mass and Orbital Period Distribution of Extrasolar Planets
• Efficient, uninformative sampling of limb darkening coefficients for two-parameter laws
• Prevalence of Earth-size planets orbiting Sun-like stars
• Kepler Presearch Data Conditioning I - Architecture and Algorithms for Error Correction in Kepler Light Curves
• Most 1.6 Earth-Radius Planets are not Rocky
• Star counts in the Galaxy. Simulating from very deep to very shallow photometric surveys with the TRILEGAL code
• The Mass-Radius Relation for 65 Exoplanets Smaller than 4 Earth Radii
• One or more bound planets per Milky Way star from microlensing observations
• Revised Stellar Properties of Kepler Targets for the Quarter 1-16 Transit Detection Run
• Core-Accretion Model Predicts Few Jovian-Mass Planets Orbiting Red Dwarfs
• False positive probabilties for all Kepler Objects of Interest: 1284 newly validated planets and 428 likely false positives
• Kepler Eclipsing Binary Stars. VII. The Catalog of Eclipsing Binaries Found in the Entire Kepler Data-Set
• Imaging Extrasolar Giant Planets
• Terrestrial Planet Occurrence Rates for the Kepler GK Dwarf Sample
• Astrometric exoplanet detection with Gaia
• Friends of Hot Jupiters I: A Radial Velocity Search for Massive, Long-Period Companions to Close-In Gas Giant Planets
• Frequency of Solar-Like Systems and of Ice and Gas Giants Beyond the Snow Line from High-Magnification Microlensing Events in 2005-2008
• Parametrizing the exoplanet eccentricity distribution with the Beta distribution
• Binning is sinning: morphological light-curve distortions due to finite integration time
• Exoplanet population inference and the abundance of Earth analogs from noisy, incomplete catalogs
• An Efficient Automated Validation Procedure for Exoplanet Transit Candidates
• Probabilistic Mass-Radius Relationship for Sub-Neptune-Sized Planets
• On the Low False Positive Probabilities of Kepler Planet Candidates
• Architecture of Planetary Systems Based on Kepler Data: Number of Planets and Coplanarity
• Planetary Candidates Observed by Kepler. VII. The First Fully Uniform Catalog Based on The Entire 48 Month Dataset (Q1-Q17 DR24)
• Planetary Candidates Observed by Kepler IV: Planet Sample From Q1-Q8 (22 Months)
• An Increase in the Mass of Planetary Systems around Lower-Mass Stars
• Planetary Candidates Observed by Kepler V: Planet Sample from Q1-Q12 (36 Months)
• The statistics of multi-planet systems
• Statistics of Long Period Gas Giant Planets in Known Planetary Systems
• Identification of Background False Positives from Kepler Data
• The Kepler Dichotomy among the M Dwarfs: Half of Systems Contain Five or More Coplanar Planets
• The Photoeccentric Effect and Proto-Hot Jupiters I. Measuring photometric eccentricities of individual transiting planets
• Planet Hunters: The First Two Planet Candidates Identified by the Public using the Kepler Public Archive Data
• Synthesizing Exoplanet Demographics from Radial Velocity and Microlensing Surveys, II: The Frequency of Planets Orbiting M Dwarfs
• The frequency of snowline-region planets from four-years of OGLE-MOA-Wise second-generation microlensing
• Properties of analytic transit light curve models
• Measuring Transit Signal Recovery in the Kepler Pipeline II: Detection Efficiency as Calculated in One Year of Data
• Synthesizing Exoplanet Demographics: A Single Population of Long-Period Planetary Companions to M Dwarfs Consistent with Microlensing, Radial Velocity, and Direct Imaging Surveys
• Transits and Occultations
• Measuring Transit Signal Recovery in the Kepler Pipeline I: Individual Events
• Objects in Kepler's Mirror May be Larger Than They Appear: Bias and Selection Effects in Transiting Planet Surveys
• Planet Hunters. VIII. Characterization of 41 Long-Period Exoplanet Candidates from Kepler Archival Data
• Single Transit Candidates from K2: Detection and Period Estimation
• Planet Hunters. V. A Confirmed Jupiter-Size Planet in the Habitable Zone and 42 Planet Candidates from the Kepler Archive Data
• Transiting Planet Candidates Beyond the Snow Line Detected by Visual Inspection of 7557 Kepler Objects of Interest
• A Transiting Jupiter Analog
• Characterizing Long-Period Transiting Planets Observed by Kepler
• A Novel Method to Photometrically Constrain Orbital Eccentricities: Multibody Asterodensity Profiling (MAP)
• Identifying False Alarms in the Kepler Planet Candidate Catalog
• Discovery of a Transiting Planet Near the Snow-Line
• Spitzer Observations of Exoplanets Discovered with The Kepler K2 Mission
• The Transit Transmission Spectrum of a Cold Gas Giant Planet
• Transit and Radial Velocity Survey Efficiency Comparison for a Habitable Zone Earth
• No Timing Variations Observed in Third Transit of Snow-Line Exoplanet Kepler-421b
• Flicker as a tool for characterizing planets through Asterodensity Profiling

Cited by in corpus (73)

• Fast and scalable Gaussian process modeling with applications to astronomical time series
• Planetary Candidates Observed by Kepler. VIII. A Fully Automated Catalog With Measured Completeness and Reliability Based on Data Release 25
• Identifying Exoplanets with Deep Learning: A Five Planet Resonant Chain around Kepler-80 and an Eighth Planet around Kepler-90
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• An Exomoon Survey of 70 Cool Giant Exoplanets and the New Candidate Kepler-1708 b-i
• Zodiacal Exoplanets in Time (ZEIT) V: A Uniform Search for Transiting Planets in Young Clusters Observed by K2
• Ultra-short-period planets from secular chaos
• The effects of external planets on inner systems: multiplicities, inclinations, and pathways to eccentric warm Jupiters
• Implications of the interstellar object 1I/'Oumuamua for planetary dynamics and planetesimal formation
• Detection of Hundreds of New Planet Candidates and Eclipsing Binaries in K2 Campaigns 0-8
• Effects of Unseen Additional Planetary Perturbers on Compact Extrasolar Planetary Systems
• Planet Formation in Disks with Inclined Binary Companions: Can Primordial Spin-Orbit Misalignment be Produced?
• Solar System Physics for Exoplanet Research
• Planet Hunters TESS I: TOI 813, a subgiant hosting a transiting Saturn-sized planet on an 84-day orbit
• Discovery of three self-lensing binaries from Kepler
• The Volatility Trend of Protosolar and Terrestrial Elemental Abundances
• TOI-257b (HD 19916b): A Warm sub-Saturn Orbiting an Evolved F-type Star
• Perturbation of Compact Planetary Systems by Distant Giant Planets
• An Estimate of the Yield of Single-Transit Planetary Events from the Transiting Exoplanet Survey Satellite
• Exploring Kepler Giant Planets in the Habitable Zone
• Long-Period Giant Companions to Three Compact, Multiplanet Systems
• Mutual Orbital Inclinations Between Cold Jupiters and Inner Super-Earths
• Measuring the Galactic Distribution of Transiting Planets with WFIRST
• Planet Formation: An Optimized Population-Synthesis Approach
• Revisiting the Long-Period Transiting Planets from Kepler
• The TESS-Keck Survey. VIII. Confirmation of a Transiting Giant Planet on an Eccentric 261 day Orbit with the Automated Planet Finder Telescope
• Rapid Formation of Jupiter and Wide-Orbit Exoplanets in Disks with Pressure Bumps
• Giant planet effects on terrestrial planet formation and system architecture
• Transiting Planets near the Snow Line from Kepler. I. Catalog
• Kepler-167e as a Probe of the Formation Histories of Cold Giants with Inner Super-Earths
• TOI-5678 b: A 48-day transiting Neptune-mass planet characterized with CHEOPS and HARPS
• Transit least-squares survey IV. Earth-like transiting planets expected from the PLATO mission
• Secular chaos in white-dwarf planetary systems: origins of metal pollution and short-period planetary companions
• An Automated Method to Detect Transiting Circumbinary Planets
• Comprehensive analysis of HD 105, a young Solar System analog
• A companion on the planet/brown dwarf mass boundary on a wide orbit discovered by gravitational microlensing
• Giant Outer Transiting Exoplanet Mass (GOT 'EM) Survey. I. Confirmation of an Eccentric, Cool Jupiter With an Interior Earth-sized Planet Orbiting Kepler-1514
• Identify Light-Curve Signals with Deep Learning Based Object Detection Algorithm. I. Transit Detection
• Transiting planet candidate from K2 with the longest period
• Stellar abundance of binary stars: their role in determining the formation location of super-Earths and ice giants
• Giant Outer Transiting Exoplanet Mass (GOT 'EM) Survey. II. Discovery of a Failed Hot Jupiter on a 2.7 Year, Highly Eccentric Orbit
• An ice giant exoplanet interpretation of the anomaly in microlensing event OGLE-2011-BLG-0173
• The Weird Detector: Flagging periodic, coherent signals of arbitrary shape in time series photometry
• EXPRES IV: Two Additional Planets Orbiting $\rho$ Coronae Borealis Reveal Uncommon System Architecture
• The Demographics of Wide-Separation Planets
• Out-of-Transit Refracted Light in the Atmospheres of Transiting and Non-Transiting Exoplanets
• Precovery of TESS Single Transits with KELT
• The SOPHIE search for northern extrasolar planets. XVIII: Six new cold Jupiters, including one of the most eccentric exoplanet orbits
• Matched filtering with non-Gaussian noise for planet transit detections
• RV-exoplanet eccentricities: Good, Beta, and Best
• Estimation of singly-transiting K2 planet periods with Gaia parallaxes
• A 16 Hour Transit of Kepler-167 e Observed by the Ground-based Unistellar Telescope Network
• The California Legacy Survey II. Occurrence of Giant Planets Beyond the Ice line
• The Perkins INfrared Exosatellite Survey (PINES) II. Transit Candidates and Implications for Planet Occurrence around L and T Dwarfs
• Validation and Initial Characterization of the Long Period Planet Kepler-1654 b
• On the follow-up efforts of long-period transiting planet candidates detected with Gaia astrometry
• The Rate of Planet-star Coalescences Due to Tides and Stellar Evolution
• Hundreds of new periodic signals detected in the first year of $TESS$ with the $\mathtt{weirddetector}$
• Planet Occurrence: Doppler and Transit Surveys
• Weighing stars from birth to death: mass determination methods across the HRD
• Planet formation: key mechanisms and global models
• Exoplanet Transit Candidate Identification in TESS Full-Frame Images via a Transformer-Based Algorithm
• Kepler's Last Planet Discoveries: Two New Planets and One Single-Transit Candidate from K2 Campaign 19
• Search for exocomets transits in Kepler light curves: Ten new transits identified
• A Cool Earth-sized Planet Candidate Transiting a Tenth Magnitude K-dwarf From K2
• The Visual Survey Group: A Decade of Hunting Exoplanets and Unusual Stellar Events with Space-Based Telescopes
• The SATCHEL pipeline: A general tool for data classified through citizen science
• Special cases : moons, rings, comets, trojans
• Friends and Foes: Conditional Occurrence Rates of Exoplanet Companions and their Impact on Radial Velocity Follow-up Surveys
• Twinkle Twinkle Little Star, Roman Sees Where You Are: Predicting Exoplanet Transit Yields in the Rosette Nebula with the Nancy Grace Roman Space Telescope
• Exploring Long-period Architectures: Four New Planet Candidates from Kepler with Periods >342 days