Homogeneously derived transit timings for 17 exoplanets and reassessed TTV trends for WASP-12 and WASP-4

Abstract

We homogeneously analyse $\sim 3.2\times 10^5$ photometric measurements for $\sim 1100$ transit lightcurves belonging to $17$ exoplanet hosts. The photometric data cover $16$ years 2004--2019 and include amateur and professional observations. Old archival lightcurves were reprocessed using up-to-date exoplanetary parameters and empirically debiased limb-darkening models. We also derive self-consistent transit and radial-velocity fits for $13$ targets. We confirm the nonlinear TTV trend in the WASP-12 data at a high significance, and with a consistent magnitude. However, Doppler data reveal hints of a radial acceleration about $(-7.5\pm 2.2)$~m/s/yr, indicating the presence of unseen distant companions, and suggesting that roughly $10$ per cent of the observed TTV was induced via the light-travel (or Roemer) effect. For WASP-4, a similar TTV trend suspected after the recent TESS observations appears controversial and model-dependent. It is not supported by our homogeneus TTV sample, including $10$ ground-based EXPANSION lightcurves obtained in 2018 simultaneously with TESS. Even if the TTV trend itself does exist in WASP-4, its magnitude and tidal nature are uncertain. Doppler data cannot entirely rule out the Roemer effect induced by possible distant companions.

arXiv comment19 pages, 4 figures, 6 tables; revised manuscript submitted to MNRAS; online-only supplements are in the download archive

References in corpus (83)

• Gaia Data Release 2. Summary of the contents and survey properties
• Analytic Lightcurves for Planetary Transit Searches
• Astrophysics Source Code Library
• Fast and scalable Gaussian process modeling with applications to astronomical time series
• Achieving better than 1 minute accuracy in the Heliocentric and Barycentric Julian Dates
• Efficient, uninformative sampling of limb darkening coefficients for two-parameter laws
• Obliquities of Hot Jupiter host stars: Evidence for tidal interactions and primordial misalignments
• The effect of red noise on planetary transit detection
• Improved parameters for extrasolar transiting planets
• Spin-orbit angle measurements for six southern transiting planets; New insights into the dynamical origins of hot Jupiters
• WASP-12b: The hottest transiting planet yet discovered
• Assessing statistical significance of periodogram peaks
• The HARPS-TERRA project I. Description of the algorithms, performance and new measurements on a few remarkable stars observed by HARPS
• Friends of Hot Jupiters I: A Radial Velocity Search for Massive, Long-Period Companions to Close-In Gas Giant Planets
• Radial Velocity Jitter in Stars from the California and Carnegie Planet Search at Keck Observatory
• Water Vapor in the Spectrum of the Extrasolar Planet HD 189733b: 1. the Transit
• SWEET-Cat: A catalogue of parameters for Stars With ExoplanETs I. New atmospheric parameters and masses for 48 stars with planets
• KELT-1b: A Strongly Irradiated, Highly Inflated, Short Period, 27 Jupiter-mass Companion Transiting a mid-F Star
• Detection of transits of the nearby hot Neptune GJ 436 b
• Transiting exoplanets from the CoRoT space mission II. CoRoT-Exo-2b: A transiting planet around an active G star
• 55 Cancri (Copernicus): A Multi-Planet System with a Hot Super-Earth and a Jupiter Analogue
• WASP-3b: a strongly-irradiated transiting gas-giant planet
• Hubble Space Telescope times-series photometry of the planetary transit of HD189733: no moon, no rings, starspots
• High-precision photometry by telescope defocussing. I. The transiting planetary system WASP-5
• The Transit Light Curve Project. V. System Parameters and Stellar Rotation Period of HD 189733
• The Apparently Decaying Orbit of WASP-12
• Starspots and spin-orbit alignment in the WASP-4 exoplanetary system
• Transmission Spectroscopy of the Hot-Jupiter WASP-12b from 0.7 to 5 microns
• Improved parameters for the transiting hot Jupiters WASP-4b and WASP-5b
• Departure from the constant-period ephemeris for the transiting exoplanet WASP-12 b
• WASP-4b: a 12th-magnitude transiting hot-Jupiter in the Southern hemisphere
• The thermal emission of the young and massive planet CoRoT-2b at 4.5 and 8 microns
• HAT-P-13b,c: a transiting hot Jupiter with a massive outer companion on an eccentric orbit
• Accounting for velocity jitter in planet search surveys
• The Transit Light Curve Project. III. Tres Transits of TrES-1
• The HAT-P-13 Exoplanetary System: Evidence for Spin-Orbit Alignment and a Third Companion
• The transiting exoplanet host star GJ 436: a test of stellar evolution models in the lower main sequence, and revised planetary parameters
• The Transit Light Curve project. XIV. Confirmation of Anomalous Radii for the Exoplanets TrES-4b, HAT-P-3b, and WASP-12b
• The Transit Light Curve Project. XI. Submillimagnitude Photometry of Two Transits of the Bloated Planet WASP-4b
• Long-Term Transit Timing Monitoring and Refined Light Curve Parameters of HAT-P-13b
• Transit Timing Variation Measurements of WASP-12b and Qatar-1b: No Evidence for Additional Planets
• The GAPS Programme with HARPS-N at TNG XVI: Measurement of the Rossiter-McLaughlin effect of the transiting planetary systems HAT-P-3, HAT-P-12, HAT-P-22, WASP-39 and WASP-60
• Transit timing variation in exoplanet WASP-3b
• Discovery and characterization of WASP-6b, an inflated sub-Jupiter mass planet transiting a solar-type star
• High-precision photometry by telescope defocussing. II. The transiting planetary system WASP-4
• Benchmarking the power of amateur observatories for TTV exoplanets detection
• Refined parameters of the planet orbiting HD 189733
• WASP-4b Arrived Early for the TESS Mission
• WASP-12b and HAT-P-8b are Members of Triple Star Systems
• Transits and starspots in the WASP-6 planetary system
• Orbital alignment and starspot properties in the WASP-52 planetary system
• Qatar-2: A K dwarf orbited by a transiting hot Jupiter and a more massive companion in an outer orbit
• The GTC exoplanet transit spectroscopy survey. VII. Detection of sodium in WASP-52b's cloudy atmosphere
• Physical properties, starspot activity, orbital obliquity, and transmission spectrum of the Qatar-2 planetary system from multi-colour photometry
• A Hubble Space Telescope transit light curve for GJ436b
• The GAPS Programme with HARPS-N@TNG V. A comprehensive analysis of the XO-2 stellar and planetary systems
• Understanding WASP-12b
• Multi-site campaign for transit timing variations of WASP-12 b: possible detection of a long-period signal of planetary origin
• High-precision photometry by telescope defocussing. III. The transiting planetary system WASP-2
• A Prograde, Low-Inclination Orbit for the Very Hot Jupiter WASP-3b
• The Transit Light Curve Project. XII. Six Transits of the Exoplanet XO-2b
• PlanetPack: a radial-velocity time-series analysis tool facilitating exoplanets detection, characterization, and dynamical simulations
• A new analysis of the WASP-3 system: no evidence for an additional companion
• Enhanced models for stellar Doppler noise reveal hints of a 13-year activity cycle of 55 Cancri
• Computing Limb Darkening Coefficients from Stellar Atmosphere Models
• Refined physical properties of the HAT-P-13 planetary system
• Independent confirmation and refined parameters of the hot Jupiter XO-5b
• Gemini/GMOS Transmission Spectral Survey: Complete Optical Transmission Spectrum of the hot Jupiter WASP-4b
• TASTE: The Asiago Search for Transit timing variations of Exoplanets. I. Overview and improved parameters for HAT-P-3b and HAT-P-14b
• HAT-P-13: a multi-site campaign to detect the transit of the second planet in the system
• No Transit Timing Variations in WASP-4
• High Cadence Near Infrared Timing Observations of Extrasolar Planets: I. GJ 436b and XO-1b
• Analytic models of the Rossiter-McLaughlin effect for arbitrary eclipser/star size ratios and arbitrary multiline stellar spectra
• TraMoS project III: Improved physical parameters, timing analysis, and star-spot modelling of the WASP-4b exoplanet system from 38 transit observations
• TASTE. III. A homogeneous study of transit time variations in WASP-3b
• WASP-4b Transit Observations With GROND
• Transit timing variations in the HAT-P-13 planetary system
• Photometric Follow-up Observations of the Transiting Neptune-Mass Planet GJ 436b
• TASTE. II. A new observational study of transit time variations in HAT-P-13b
• Transit timing analysis of the exoplanet TrES-5 b. Possible existence of the exoplanet TrES-5 c
• PlanetPack3: a radial-velocity and transit analysis tool for exoplanets
• APOSTLE: Longterm Transit Monitoring and Stability Analysis of XO-2b
• A Transmission Spectrum Of HD 189733b From Multiple Broadband Filter Observations

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• The Orbit of WASP-12b is Decaying
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• DREAM I. Orbital architecture orrery
• Constraints on Metastable Helium in the Atmospheres of WASP-69b and WASP-52b with Ultra-Narrowband Photometry
• ExoClock project II: A large-scale integrated study with 180 updated exoplanet ephemerides
• Simultaneous TESS and NGTS Transit Observations of WASP-166b
• WASP-4 is Accelerating Toward the Earth
• The Possible Tidal Demise of Kepler's First Planetary System
• Characterizing exoplanetary atmospheres at high resolution with SPIRou: Detection of water on HD 189733 b
• Examining the orbital decay targets KELT-9 b, KELT-16 b and WASP-4 b, and the transit-timing variations of HD 97658 b
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• DREAM: III.A helium survey in exoplanets on the edge of the hot Neptune desert with GIANO-B@TNG
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• Evidence of Long-Term Period Variations in the Exoplanet Transit Database (ETD)
• Homogeneous Transit Timing Analyses of Ten Exoplanet Systems
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• TESS Observations of the Hot Jupiter Exoplanet XO-6b: No Evidence of Transit Timing Variations
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• Monitoring of transiting exoplanets and their host stars with small aperture telescopes
• The apparent tidal decay of WASP-4 b can be explained by the Rømer effect
• The study on transiting systems HAT-P-13, HAT-P-16 and WASP-32 through combining ground-based and TESS photometry
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• The impact of photospheric brightness field on exoplanetary transit timings and the TTV excess of HD 189733 b
• Near infrared and optical emission of WASP-5 b
• Cleaning WASP-33 b transits from the host star photometric variability: analysis of TESS data from two sectors
• Characterizing the WASP-4 system with TESS and radial velocity data: Constraints on the cause of the hot Jupiter's changing orbit and evidence of an outer planet
• Observing transiting exoplanets with the MicroObservatory: 43 new transit light curves of the hot Jupiter HAT-P-32b