A Prograde, Low-Inclination Orbit for the Very Hot Jupiter WASP-3b

Abstract

We present new spectroscopic and photometric observations of the transiting exoplanetary system WASP-3. Spectra obtained during two separate transits exhibit the Rossiter-McLaughlin (RM) effect and allow us to estimate the sky-projected angle between the planetary orbital axis and the stellar rotation axis, lambda = 3.3^{+2.5}_{-4.4} degrees. This alignment between the axes suggests that WASP-3b has a low orbital inclination relative to the equatorial plane of its parent star. During our first night of spectroscopic measurements, we observed an unexpected redshift briefly exceeding the expected sum of the orbital and RM velocities by 140 m/s. This anomaly could represent the occultation of material erupting from the stellar photosphere, although it is more likely to be an artifact caused by moonlight scattered into the spectrograph.

23 pages, 4 figures, Accepted for publication in The Astrophysical Journal, Replacement includes revised citations

References in corpus (33)

• Analytic Lightcurves for Planetary Transit Searches
• Transiting exoplanets from the CoRoT space mission VIII. CoRoT-7b: the first Super-Earth with measured radius
• The effect of red noise on planetary transit detection
• Chromospheric CaII Emission in Nearby F, G, K, and M stars
• Measurement of Spin-Orbit Alignment in an Extrasolar Planetary System
• The Rossiter-McLaughlin effect and analytic radial velocity curves for transiting extrasolar planetary systems
• Parameter Estimation from Time-Series Data with Correlated Errors: A Wavelet-Based Method and its Application to Transit Light Curves
• Prospects for the Characterization and Confirmation of Transiting Exoplanets via the Rossiter-McLaughlin Effect
• Exoplanetary Spin-Orbit Alignment: Results from the Ensemble of Rossiter-McLaughlin Observations
• On the tidal evolution of Hot Jupiters on inclined orbits
• WASP-3b: a strongly-irradiated transiting gas-giant planet
• The Transit Light Curve (TLC) Project. I. Four Consecutive Transits of the Exoplanet XO-1b
• HAT-P-7: A Retrograde or Polar Orbit, and a Third Body
• Misaligned spin-orbit in the XO-3 planetary system?
• WASP-17b: an ultra-low density planet in a probable retrograde orbit
• Analytic Approximations for Transit Light Curve Observables, Uncertainties, and Covariances
• First Evidence of a Retrograde Orbit of Transiting Exoplanet HAT-P-7b
• On the Spin-Orbit Misalignment of the XO-3 Exoplanetary System
• The NASA-UC Eta-Earth Program: I. A Super-Earth Orbiting HD 7924
• The Transit Light Curve Project. III. Tres Transits of TrES-1
• Properties of analytic transit light curve models
• A Smaller Radius for the Transiting Exoplanet WASP-10b
• A Third Exoplanetary System with Misaligned Orbital and Stellar Spin Axes
• Spin-orbit misalignment in the HD80606 planetary system
• The Transit Ingress and the Tilted Orbit of the Extraordinarily Eccentric Exoplanet HD 80606b
• Near-infrared transit photometry of the exoplanet HD 149026b
• Measurement of the Spin-Orbit Angle of Exoplanet HAT-P-1b
• Empirical Constraints on Trojan Companions and Orbital Eccentricities in 25 Transiting Exoplanetary Systems
• Updated parameters for the transiting exoplanet WASP-3b using RISE, a new fast camera for the Liverpool Telescope
• A cool starspot or a second transiting planet in the TrES-1 system?
• A Tentative Detection of a Starspot During Consecutive Transits of an Extrasolar Planet from the Ground: No Evidence of a Double Transiting Planet System Around TrES-1
• A Search for Variable Stars and Planetary Occultations in NGC2301 I: Techniques
• The Transit Light Curve Project. X. A Christmas Transit of HD 17156b

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• Hot Stars with Hot Jupiters Have High Obliquities
• Obliquities of Hot Jupiter host stars: Evidence for tidal interactions and primordial misalignments
• Homogeneous studies of transiting extrasolar planets. IV. Thirty systems with space-based light curves
• Spin-orbit angle measurements for six southern transiting planets; New insights into the dynamical origins of hot Jupiters
• Friends of Hot Jupiters I: A Radial Velocity Search for Massive, Long-Period Companions to Close-In Gas Giant Planets
• The Mass of KOI-94d and a Relation for Planet Radius, Mass, and Incident Flux
• Homogeneous studies of transiting extrasolar planets. III. Additional planets and stellar models
• Stellar obliquities in exoplanetary systems
• Friends of Hot Jupiters II: No Correspondence Between Hot-Jupiter Spin-Orbit Misalignment and the Incidence of Directly Imaged Stellar Companions
• Observation of the full 12-hour-long transit of the exoplanet HD80606b. Warm-Spitzer photometry and SOPHIE spectroscopy
• Constraining Tidal Dissipation in Stars from The Destruction Rates of Exoplanets
• TESS Transit Timing of Hundreds of Hot Jupiters
• Extrasolar Planet Transits Observed at Kitt Peak National Observatory
• Transit timing variation in exoplanet WASP-3b
• Tidal Dissipation and Obliquity Evolution in Hot Jupiter Systems
• ExoClock Project III: 450 new exoplanet ephemerides from ground and space observations
• HAT-P-65b and HAT-P-66b: Two Transiting Inflated Hot Jupiters and Observational Evidence for the Re-Inflation of Close-In Giant Planets
• Visible-light Phase Curves from the Second Year of the TESS Primary Mission
• Constraints on a second planet in the WASP-3 system
• ExoClock project II: A large-scale integrated study with 180 updated exoplanet ephemerides
• A new analysis of the WASP-3 system: no evidence for an additional companion
• Rossiter-McLaughlin Effect Measurements for WASP-16, WASP-25 and WASP-31
• Homogeneously derived transit timings for 17 exoplanets and reassessed TTV trends for WASP-12 and WASP-4
• Impact of stellar companions on precise radial velocities
• ExoClock Project: An open platform for monitoring the ephemerides of Ariel targets with contributions from the public
• Detection of Ks-band Thermal Emission from WASP-3b
• TASTE. III. A homogeneous study of transit time variations in WASP-3b
• The Doppler Shadow of WASP-3b: A tomographic analysis of Rossiter-McLaughlin observations
• Prospecting transit duration variations in extrasolar planetary systems