Revised Properties and Dynamical History for the HD 17156 System
arXiv:2305.01000 · doi:10.3847/1538-3881/acd17a
Abstract
From the thousands of known exoplanets, those that transit bright host stars provide the greatest accessibility toward detailed system characterization. The first known such planets were generally discovered using the radial velocity technique, then later found to transit. HD 17156b is particularly notable among these initial discoveries because it diverged from the typical hot Jupiter population, occupying a 21.2 day eccentric () orbit, offering preliminary insights into the evolution of planets in extreme orbits. Here we present new data for this system, including ground and space-based photometry, radial velocities, and speckle imaging, that further constrain the system properties and stellar/planetary multiplicity. These data include photometry from the Transiting Exoplanet Survey Satellite (TESS) that cover five transits of the known planet. We show that the system does not harbor any additional giant planets interior to 10 AU. The lack of stellar companions and the age of the system indicate that the eccentricity of the known planet may have resulted from a previous planet-planet scattering event. We provide the results from dynamical simulations that suggest possible properties of an additional planet that culminated in ejection from the system, leaving a legacy of the observed high eccentricity for HD 17156b.
15 pages, 7 figures, accepted for publication in the Astronomical Journal
References in corpus (30)
- The Transiting Exoplanet Survey Satellite
- Dynamical Outcomes of Planet-Planet Scattering
- EXOFAST: A fast exoplanetary fitting suite in IDL
- A Technique for Extracting Highly Precise Photometry for the Two-Wheeled Kepler Mission
- Origins of Eccentric Extrasolar Planets: Testing the Planet-Planet Scattering Model
- Asteroseismology and Gaia: Testing Scaling Relations Using 2200 Kepler Stars with TGAS Parallaxes
- On the Eccentricity Distribution of Exoplanets from Radial Velocity Surveys
- The Photoeccentric Effect and Proto-Hot Jupiters I. Measuring photometric eccentricities of individual transiting planets
- Effects of Orbital Eccentricity on Extrasolar Planet Transit Detection and Lightcurves
- AMD-stability and the classification of planetary systems
- Five Intermediate-Period Planets from the N2K Sample
- High eccentricity planets from the Anglo-Australian Planet Search
- TESS Transit Timing of Hundreds of Hot Jupiters
- Impact of Orbital Eccentricity on the Detection of Transiting Extrasolar Planets
- HD 17156b: A Transiting Planet with a 21.2 Day Period and an Eccentric Orbit
- Constraining Orbital Parameters Through Planetary Transit Monitoring
- On the origin of eccentricities among extrasolar planets
- Architectures of Planetary Systems and Implications for their Formation
- Detailed Abundances of Planet-Hosting Wide Binaries. I. Did Planet Formation Imprint Chemical Signatures in the Atmospheres of HD 20782/81?
- The Spin-Orbit Alignment of the HD17156 Transiting Eccentric Planetary System
- Parameters and Predictions for the Long-Period Transiting Planet HD 17156b
- EXPRES I. HD~3651 an Ideal RV Benchmark
- Transits of Known Planets Orbiting a Naked-Eye Star
- Science Extraction from TESS Observations of Known Exoplanet Hosts
- Improved parameters for the transiting planet HD 17156b: a high-density giant planet with a very eccentric orbit
- Detectability of Exoplanetary Transits from Radial Velocity Surveys
- In the Presence of a Wrecking Ball: Orbital Stability in the HR 5183 System
- Born extra-eccentric: A broad spectrum of primordial configurations of the gas giants that match their present-day orbits
- Variable Irradiation on 1D Cloudless Eccentric Exoplanet Atmospheres
- Long-Term Stability of Planets in the Centauri System, II: Forced Eccentricities