HD 17156b: A Transiting Planet with a 21.2 Day Period and an Eccentric Orbit

Abstract

We report the detection of transits by the 3.1 M_Jup companion to the V=8.17 G0V star HD 17156. The transit was observed by three independant observers on Sept. 9/10, 2007 (two in central Italy and one in the Canary Islands), who obtained detections at confidence levels of 3.0 sigma, 5.3 sigma, and 7.9 sigma, respectively. The observations were carried out under the auspices of the Transitsearch.org network, which organizes follow-up photometric transit searches of known planet-bearing stars during the time intervals when transits are expected to possibly occur. Analyses of the 7.9 sigma data set indicates a transit depth d=0.0062+/-0.0004, and a transit duration t=186+/-5 min. These values are consistent with the transit of a Jupiter-sized planet with an impact parameter b=a*cos(i)/R_star ~ 0.8. This planet occupies a unique regime among known transiting extrasolar planets, both as a result of its large orbital eccentricity (e=0.67) and long orbital period (P=21.2 d). The planet receives a 26-fold variation in insolation during the course of its orbit, which will make it a useful object for characterization of exoplanetary atmospheric dynamics.

Accepted for publication to A&A, 4 pages, 2 figures

References in corpus (6)

• Properties of planets in binary systems. The role of binary separation
• HD147506b: A Super-Massive Planet in an Eccentric Orbit Transiting a Bright Star
• Atmospheric Dynamics of Short-period Extra Solar Gas Giant Planets I: Dependence of Night-Side Temperature on Opacity
• Five Intermediate-Period Planets from the N2K Sample
• Planets in binary systems: is the present configuration indicative of the formation process?
• On the Search For Transits of the Planets Orbiting Gl 876

Cited by in corpus (27)

• Galaxy Zoo 1 : Data Release of Morphological Classifications for nearly 900,000 galaxies
• Homogeneous studies of transiting extrasolar planets. I. Light curve analyses
• The NASA-UC-UH Eta-Earth Program: IV. A Low-mass Planet Orbiting an M Dwarf 3.6 PC from Earth
• Transit timing effects due to an exomoon
• Misaligned spin-orbit in the XO-3 planetary system?
• Falling Transiting Extrasolar Giant Planets
• The Photoeccentric Effect and Proto-Hot Jupiters I. Measuring photometric eccentricities of individual transiting planets
• Homogeneous studies of transiting extrasolar planets. II. Physical properties
• TESS Transit Timing of Hundreds of Hot Jupiters
• Impact of Orbital Eccentricity on the Detection of Transiting Extrasolar Planets
• Transiting exoplanets from the CoRoT space mission IV: CoRoT-Exo-4b: A transiting planet in a 9.2 day synchronous orbit
• Constraining Orbital Parameters Through Planetary Transit Monitoring
• Detection of a transit by the planetary companion of HD 80606
• Periastron Precession Measurements in Transiting Extrasolar Planetary Systems at the Level of General Relativity
• Transiting exoplanets from the CoRoT space mission V. CoRoT-Exo-4b: Stellar and planetary parameters
• The Spin-Orbit Alignment of the HD17156 Transiting Eccentric Planetary System
• Newly-Discovered Planets Orbiting HD~5319, HD~11506, HD~75784 and HD~10442 from the N2K Consortium
• The Frequency of Large Radius Hot and Very Hot Jupiters in omega Centauri
• Parameters and Predictions for the Long-Period Transiting Planet HD 17156b
• Theoretical Radii of Extrasolar Giant Planets: the Cases of TrES-4, XO-3b, and HAT-P-1b
• A 4-Planet System Orbiting the K0V Star HD 141399
• Improved parameters for the transiting planet HD 17156b: a high-density giant planet with a very eccentric orbit
• The obliquity of HIP 67522 b: a 17 Myr old transiting hot Jupiter-sized planet
• Closure Phase Signatures of Planet Transit Events
• Detecting "Temperate" Jupiters: The Prospects of Searching for Transiting Gas Giants in Habitability Zones
• Revised Properties and Dynamical History for the HD 17156 System
• Transit Detection of Radial Velocity Planets