A Possible Spin-Orbit Misalignment in the Transiting Eccentric Planet HD 17156b

Abstract

We present simultaneous photometric and spectroscopic observations of HD 17156b spanning a transit on UT 2007 November 12. This system is of special interest because of its 21-day period (unusually long for a transiting planet) and its high orbital eccentricity of 0.67. By modeling the Rossiter-McLaughlin effect, we find the angle between the sky projections of the orbital axis and the stellar rotation axis to be $62^{\circ }\pm 25^{\circ }$. Such a large spin-orbit misalignment, as well as the large eccentricity, could be explained as the relic of a previous gravitational interaction with other planets.

5 pages, 2 figures, 3 tables. Accepted for publication in PASJ Letters (Vol. 60, No. 2)

References in corpus (9)

• The effect of red noise on planetary transit detection
• Prospects for the Characterization and Confirmation of Transiting Exoplanets via the Rossiter-McLaughlin Effect
• The Transit Light Curve (TLC) Project. I. Four Consecutive Transits of the Exoplanet XO-1b
• HD147506b: A Super-Massive Planet in an Eccentric Orbit Transiting a Bright Star
• Measurement of the Spin-Orbit Alignment in the Exoplanetary System HD 189733
• Measurement of the Rossiter--McLaughlin Effect in the Transiting Exoplanetary System TrES-1
• Five Intermediate-Period Planets from the N2K Sample
• HD 17156b: A Transiting Planet with a 21.2 Day Period and an Eccentric Orbit
• Spin-Orbit Alignment for the Eccentric Exoplanet HD 147506b

Cited by in corpus (46)

• Dynamical Outcomes of Planet-Planet Scattering
• Hot Stars with Hot Jupiters Have High Obliquities
• Dynamical Origin of Extrasolar Planet Eccentricity Distribution
• Homogeneous studies of transiting extrasolar planets. IV. Thirty systems with space-based light curves
• Origins of Eccentric Extrasolar Planets: Testing the Planet-Planet Scattering Model
• The Transit Light Curve Project. IX. Evidence for a Smaller Radius of the Exoplanet XO-3b
• Exoplanetary Spin-Orbit Alignment: Results from the Ensemble of Rossiter-McLaughlin Observations
• On the tidal evolution of Hot Jupiters on inclined orbits
• The physical properties of extrasolar planets
• Stellar obliquities in exoplanetary systems
• First Evidence of a Retrograde Orbit of Transiting Exoplanet HAT-P-7b
• On The Origins Of Eccentric Close-in Planets
• On the Spin-Orbit Misalignment of the XO-3 Exoplanetary System
• Constraining Tidal Dissipation in Stars from The Destruction Rates of Exoplanets
• Discovery and Rossiter-McLaughlin Effect of Exoplanet Kepler-8b
• TESS Transit Timing of Hundreds of Hot Jupiters
• Extrasolar Planet Transits Observed at Kitt Peak National Observatory
• A Possible Tilted Orbit of the Super-Neptune HAT-P-11b
• Analytic Description of the Rossiter-McLaughlin Effect for Transiting Exoplanets: Cross-Correlation Method and Comparison with Simulated Data
• HATS-1b: The First Transiting Planet Discovered by the HATSouth Survey
• The spin-orbit alignment of the Fomalhaut planetary system probed by optical long baseline interferometry
• The Prograde Orbit of Exoplanet TrES-2b
• Measurement of the Spin-Orbit Angle of Exoplanet HAT-P-1b
• 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
• Stellar proper motion and the timing of planetary transits
• 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
• Improved Measurement of the Rossiter-McLaughlin Effect in the Exoplanetary System HD 17156
• The Rossiter-McLaughlin Effect of the Transiting Exoplanet XO-4b
• Characterization of the HD 17156 planetary system
• Effects of Mutual Transits by Extrasolar Planet-Companion Systems on Light Curves
• Estimating the masses of extra-solar planets
• Protostellar Cloud Fragmentation and Inward Migration by Disk Capture as the Origin of Massive Exoplanets
• Transiting Extrasolar Planet with a Companion: Effects of Orbital Eccentricity and Inclination
• The well-aligned orbit of WASP-84b: evidence for disc migration
• Terrestrial Planet Formation in the Inclined Systems: Application to OGLE-2006-BLG-109L System
• The obliquity of HIP 67522 b: a 17 Myr old transiting hot Jupiter-sized planet
• On the possibility of detecting extrasolar planets' atmospheres with the Rossiter-McLaughlin-effect
• Giant Outer Transiting Exoplanet Mass (GOT 'EM) Survey. II. Discovery of a Failed Hot Jupiter on a 2.7 Year, Highly Eccentric Orbit
• Two Jupiter-Mass Planets Orbiting HD 154672 and HD 205739
• Measuring accurate transit parameters
• Rapidly rotating stars and their transiting planets: KELT-17b, KELT-19Ab, and KELT-21b in the CHEOPS and TESS era
• Revised Properties and Dynamical History for the HD 17156 System