Understanding WASP-12b

Abstract

The orbital period of the hot Jupiter WASP-12b is apparently changing. We study whether this reflects orbital decay due to tidal dissipation in the star, or apsidal precession of a slightly eccentric orbit. In the latter case, a third body or other perturbation would be needed to sustain the eccentricity against tidal dissipation in the planet itself. We have analyzed several such perturbative scenarios, but none is satisfactory. Most likely therefore, the orbit really is decaying. If this is due to a dynamical tide, then WASP-12 should be a subgiant without a convective core as Weinberg et al. (2017) have suggested. We have modeled the star with the MESA code. While no model fits all of the observational constraints, including the luminosity implied by the GAIA DR2 distance, main-sequence models are less discrepant than subgiant ones.

arXiv comment12 pages, 4 figure, submitted to MNRAS

References in corpus (50)

• The chemical composition of the Sun
• Gaia Data Release 2. Summary of the contents and survey properties
• The Gaia mission
• Modules for Experiments in Stellar Astrophysics (MESA)
• Modules for Experiments in Stellar Astrophysics (MESA): Giant Planets, Oscillations, Rotation, and Massive Stars
• Modules for Experiments in Stellar Astrophysics (MESA): Binaries, Pulsations, and Explosions
• MESA Isochrones and Stellar Tracks (MIST). I: Solar-Scaled Models
• Modules for Experiments in Stellar Astrophysics (MESA): Convective Boundaries, Element Diffusion, and Massive Star Explosions
• Obliquities of Hot Jupiter host stars: Evidence for tidal interactions and primordial misalignments
• Binary and Millisecond Pulsars
• Galactic Reddening in 3D from Stellar Photometry - An Improved Map
• Accurate, Empirical Radii and Masses of Planets and their Host Stars with Gaia Parallaxes
• WASP-12b: The hottest transiting planet yet discovered
• Friends of Hot Jupiters I: A Radial Velocity Search for Massive, Long-Period Companions to Close-In Gas Giant Planets
• The GAPS Programme with HARPS-N@TNG XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets
• Evidence for a systematic offset of -80 micro-arcseconds in the Gaia DR2 parallaxes
• Metals in the Exosphere of the Highly Irradiated Planet WASP-12b
• Improved spectroscopic parameters for transiting planet hosts
• Hubble Space Telescope Astrometry of the Procyon System
• Rotation periods of 12 000 main-sequence Kepler stars: Dependence on stellar spectral type and comparison with v sin i observations
• Spectroscopic Signatures of Convection in the Spectrum of Procyon. Fundamental Parameters and Iron Abundance
• On the tidal interaction of a solar-type star with an orbiting companion: Excitation of g mode oscillation and orbital evolution
• Dynamical Tide in Solar-Type Binaries
• Early UV Ingress in WASP-12b: Measuring Planetary Magnetic Fields
• The Apparently Decaying Orbit of WASP-12
• Homogeneous studies of transiting extrasolar planets. V. New results for 38 planets
• Falling Transiting Extrasolar Giant Planets
• Departure from the constant-period ephemeris for the transiting exoplanet WASP-12 b
• Mass Transfer, Transiting Stream and Magnetopause in Close-in Exoplanetary Systems with Applications to WASP-12
• Stellar companions to exoplanet host stars: Lucky Imaging of transiting planet hosts
• New and updated stellar parameters for 90 transit hosts. The effect of the surface gravity
• Observational constraints on tidal effects using orbital eccentricities
• A multi-site campaign to measure solar-like oscillations in Procyon. II. Mode frequencies
• A detailed spectropolarimetric analysis of the planet hosting star WASP-12
• The equilibrium tide in stars and giant planets: I - the coplanar case
• Transit Timing Variation Measurements of WASP-12b and Qatar-1b: No Evidence for Additional Planets
• On the interaction between tides and convection
• On the Limb Darkening, Spectral Energy Distribution, and Temperature Structure of Procyon
• On Dissipation inside Turbulent Convection Zones from 3D Simulations of Solar Convection
• WASP-12b and HAT-P-8b are Members of Triple Star Systems
• The Sensitivity of Convection Zone Depth to Stellar Abundances: An Absolute Stellar Abundance Scale from Asteroseismology
• Tidal Dissipation in WASP-12
• Orbital period variations of hot-Jupiters caused by the Applegate effect
• Temporal Variations in the Sun's Rotational Kinetic Energy
• Multi-site campaign for transit timing variations of WASP-12 b: possible detection of a long-period signal of planetary origin
• Orbital eccentricity of WASP-12 and WASP-14 from new radial-velocity monitoring with SOPHIE
• HATS-18 b: An Extreme Short--Period Massive Transiting Planet Spinning Up Its Star
• Dynamical Tides Reexpressed
• The TROY project: Searching for co-orbital bodies to known planets. I. Project goals and first results from archival radial velocity
• Dynamical tides in exoplanetary systems containing Hot Jupiters: confronting theory and observations

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• Colour-magnitude diagrams of transiting Exoplanets -- III. A public code, nine strange planets, and the role of Phosphine
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• Unraveling the evolution of hot Jupiter systems under the effect of tidal and magnetic interactions and mass loss
• Observations of the Kepler Field with TESS: Predictions for Planet Yield and Observable Features
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• Orbital period modulation in hot Jupiter systems
• BD-14 3065b (TOI-4987b): from giant planet to brown dwarf: evidence for deuterium burning in old age?
• PEPSI's non-detection of escaping hydrogen and metal lines adds to the enigma of WASP-12 b
• TrES-1 b: A Case Study in Detecting Secular Evolution of Exoplanet Orbits
• The impact of photospheric brightness field on exoplanetary transit timings and the TTV excess of HD 189733 b
• Characterizing the WASP-4 system with TESS and radial velocity data: Constraints on the cause of the hot Jupiter's changing orbit and evidence of an outer planet
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• Evolution of the ZTF SLRN-2020 star-planet merger