Parameters and Predictions for the Long-Period Transiting Planet HD 17156b

Abstract

We report high-cadence time-series photometry of the recently-discovered transiting exoplanet system HD 17156, spanning the time of transit on UT 2007 October 1, from three separate observatories. We present a joint analysis of our photometry, previously published radial velocity measurements, and times of transit center for 3 additional events. Adopting the spectroscopically-determined values and uncertainties for the stellar mass and radius, we estimate a planet radius of Rp = 1.01 +/- 0.09 RJup and an inclination of i = 86.5 +1.1 -0.7 degrees. We find a time of transit center of Tc = 2454374.8338 +/- 0.0020 HJD and an orbital period of P = 21.21691 +/- 0.00071 days, and note that the 4 transits reported to date show no sign of timing variations that would indicate the presence of a third body in the system. Our results do not preclude the existence of a secondary eclipse, but imply there is only a 9.2% chance for this to be present, and an even lower probability (6.9%) that the secondary eclipse would be a non-grazing event. Due to its eccentric orbit and long period, HD 17156b is a fascinating object for the study of the dynamics of exoplanet atmospheres. To aid such future studies, we present theoretical light curves for the variable infrared emission from the visible hemisphere of the planet throughout its orbit.

8 pages, 4 figures, 1 table, emulateapj format. v2: accepted for publication in ApJ, minor changes. Changed to emulateapj to save the rainforests

References in corpus (38)

• Analytic Lightcurves for Planetary Transit Searches
• Shrinking binary and planetary orbits by Kozai cycles with tidal friction
• Planetary Radii across Five Orders of Magnitude in Mass and Stellar Insolation: Application to Transits
• DHP Framework: Digital Health Passports Using Blockchain -- Use case on international tourism during the COVID-19 pandemic
• On detecting terrestrial planets with timing of giant planet transits
• A map of the day-night contrast of the extrasolar planet HD 189733b
• Detection of Thermal Emission from an Extrasolar Planet
• Atmospheric Circulation and Tides of "51Peg b-like" Planets
• Infrared radiation from an extrasolar planet
• The 3.6-8.0 Micron Broadband Emission Spectrum of HD 209458b: Evidence for an Atmospheric Temperature Inversion
• Possible Solutions to the Radius Anomalies of Transiting Giant Planets
• Structure and Evolution of Nearby Stars with Planets II. Physical Properties of ~1000 Cool Stars from the SPOCS Catalog
• Prospects for the Characterization and Confirmation of Transiting Exoplanets via the Rossiter-McLaughlin Effect
• WASP-1b and WASP-2b: Two new transiting exoplanets detected with SuperWASP and SOPHIE
• On the Radii of Extrasolar Giant Planets
• The phase-dependent Infrared brightness of the extrasolar planet upsilon Andromedae b
• Dynamics and Disequilibrium Carbon Chemistry in Hot Jupiter Atmospheres, With Application to HD 209458b
• Dynamic Meteorology at the Photosphere of HD 209458b
• Changing Face of the Extrasolar Giant Planet, HD 209458b
• HD147506b: A Super-Massive Planet in an Eccentric Orbit Transiting a Bright Star
• Hot Jupiters in binary star systems
• Long-term tidal evolution of short-period planets with companions
• XO-3b: A Massive Planet in an Eccentric Orbit Transiting an F5V Star
• The Influence of Atmospheric Dynamics on the Infrared Spectra and Light Curves of Hot Jupiters
• Atmospheric Dynamics of Short-period Extra Solar Gas Giant Planets I: Dependence of Night-Side Temperature on Opacity
• Hot Nights on Extrasolar Planets: Mid-IR Phase Variations of Hot Jupiters
• Five Intermediate-Period Planets from the N2K Sample
• The Transit Light Curve Project. III. Tres Transits of TrES-1
• TrES-4: A Transiting Hot Jupiter of Very Low Density
• An analysis of the transit times of TrES-1b
• HD 17156b: A Transiting Planet with a 21.2 Day Period and an Eccentric Orbit
• On the Surface Heating of Synchronously-Spinning Short-Period Jovian Planets
• The Monitor project: Data processing and lightcurve production
• Refined parameters and spectroscopic transit of the super-massive planet HD147506b
• Hydrodynamic Simulations of Unevenly Irradiated Jovian Planets
• A Possible Spin-Orbit Misalignment in the Transiting Eccentric Planet HD 17156b
• The Monitor project: Searching for occultations in young open clusters
• Detection of Intermediate-Period Transiting Planets with a Network of Small Telescopes: transitsearch.org

Cited by in corpus (20)

• Homogeneous studies of transiting extrasolar planets. IV. Thirty systems with space-based light curves
• A Model for Thermal Phase Variations of Circular and Eccentric Exoplanets
• TESS Transit Timing of Hundreds of Hot Jupiters
• Three-dimensional atmospheric circulation of hot Jupiters on highly eccentric orbits
• Extrasolar Planet Transits Observed at Kitt Peak National Observatory
• Empirical Constraints on Trojan Companions and Orbital Eccentricities in 25 Transiting Exoplanetary Systems
• ExoClock Project III: 450 new exoplanet ephemerides from ground and space observations
• The Spin-Orbit Alignment of the HD17156 Transiting Eccentric Planetary System
• The Transit Light Curve Project. X. A Christmas Transit of HD 17156b
• Galactic cosmic ray induced radiation dose on terrestrial exoplanets
• The Hubble PanCET program: Transit and Eclipse Spectroscopy of the Strongly Irradiated Giant Exoplanet WASP-76b
• Theoretical Radii of Extrasolar Giant Planets: the Cases of TrES-4, XO-3b, and HAT-P-1b
• Characterization of the HD 17156 planetary system
• An ingress and a complete transit of HD 80606 b
• Estimating the masses of extra-solar planets
• Variable Irradiation on 1D Cloudless Eccentric Exoplanet Atmospheres
• The Upper Atmosphere of HD17156b
• On the follow-up efforts of long-period transiting planet candidates detected with Gaia astrometry
• Revised Properties and Dynamical History for the HD 17156 System
• Search for Super Earths by Timing of Transits with CoRoT