Mass Loss from the Exoplanet WASP-12b Inferred from $\text{Spitzer}$ Phase Curves

Abstract

The exoplanet WASP-12b is the prototype for the emerging class of ultra-hot, Jupiter-mass exoplanets. Past models have predicted---and near ultra-violet observations have shown---that this planet is losing mass. We present an analysis of two sets of 3.6 $\mu$m and 4.5 $\mu$m $\text{Spitzer}$ phase curve observations of the system which show clear evidence of infrared radiation from gas stripped from the planet, and the gas appears to be flowing directly toward or away from the host star. This accretion signature is only seen at 4.5 $\mu$m, not at 3.6 $\mu$m, which is indicative either of CO emission at the longer wavelength or blackbody emission from cool, $\lesssim$ 600 K gas. It is unclear why WASP-12b is the only ultra-hot Jupiter to exhibit this mass loss signature, but perhaps WASP-12b's orbit is decaying as some have claimed, while the orbits of other exoplanets may be more stable; alternatively, the high energy irradiation from WASP-12A may be stronger than the other host stars. We also find evidence for phase offset variability at the level of $6.4\sigma$ ($46.2^{\circ }$) at 3.6 $\mu$m.

arXiv comment9 pages plus appendices and supplementary information, published in MNRAS

References in corpus (90)

• emcee: The MCMC Hammer
• Analytic Lightcurves for Planetary Transit Searches
• A new extensive library of PHOENIX stellar atmospheres and synthetic spectra
• batman: BAsic Transit Model cAlculatioN in Python
• Efficient, uninformative sampling of limb darkening coefficients for two-parameter laws
• A map of the day-night contrast of the extrasolar planet HD 189733b
• WASP-12b: The hottest transiting planet yet discovered
• The Statistics of Albedo and Heat Recirculation on Hot Exoplanets
• High C/O Ratio and Weak Thermal Inversion in the Very Hot Atmosphere of Exoplanet WASP-12b
• From thermal dissociation to condensation in the atmospheres of ultra hot Jupiters: WASP-121b in context
• 3.6 and 4.5 Micron Phase Curves and Evidence for Non-Equilibrium Chemistry in the Atmosphere of Extrasolar Planet HD 189733b
• Metals in the Exosphere of the Highly Irradiated Planet WASP-12b
• Possible thermochemical disequilibrium in the atmosphere of the exoplanet GJ 436b
• H- Opacity and Water Dissociation in the Dayside Atmosphere of the Very Hot Gas Giant WASP-18 b
• The Broadband Infrared Emission Spectrum of the Exoplanet HD 189733b
• Theoretical Spectra and Light Curves of Close-in Extrasolar Giant Planets and Comparison with Data
• A Correlation Between Stellar Activity and Hot Jupiter Emission Spectra
• Stellar Limb-Darkening Coefficients for CoRot and Kepler
• Theoretical Spectral Models of the Planet HD 209458b with a Thermal Inversion and Water Emission Bands
• Gravity darkening in rotating stars
• Photometric Variability of the T2.5 Brown Dwarf SIMP J013656.5+093347; Evidence for Evolving Weather Patterns
• Multi-Wavelength Constraints on the Day-Night Circulation Patterns of HD 189733b
• Extremely Irradiated Hot Jupiters: Non-Oxide Inversions, H- Opacity, and Thermal Dissociation of Molecules
• The phase-dependent Infrared brightness of the extrasolar planet upsilon Andromedae b
• Near-UV Absorption, Chromospheric Activity, and Star-Planet Interactions in the WASP-12 system
• Global Climate and Atmospheric Composition of the Ultra-Hot Jupiter WASP-103b from HST and Spitzer Phase Curve Observations
• Large Amplitude Variations of an L/T Transition Brown Dwarf: Multi-Wavelength Observations of Patchy, High-Contrast Cloud Features
• Thermal Phase Variations of WASP-12b: Defying Predictions
• Orbital Phase Variations of the Eccentric Giant Planet HAT-P-2b
• Early UV Ingress in WASP-12b: Measuring Planetary Magnetic Fields
• The Apparently Decaying Orbit of WASP-12
• Spitzer Phase Curve Constraints for WASP-43b at 3.6 and 4.5 microns
• Simulating the escaping atmospheres of hot gas planets in the solar neighborhood
• Transmission Spectroscopy of the Hot-Jupiter WASP-12b from 0.7 to 5 microns
• Increased Heat Transport in Ultra-Hot Jupiter Atmospheres Through H${}_2$ Dissociation/Recombination
• Transit and Eclipse Analyses of Exoplanet HD 149026b Using BLISS Mapping
• The 4.5 $\mu$m full-orbit phase curve of the hot Jupiter HD 209458b
• Hot Nights on Extrasolar Planets: Mid-IR Phase Variations of Hot Jupiters
• The Discovery of Ellipsoidal Variations in the Kepler Light Curve of HAT-P-7
• Variability in the super-Earth 55 Cnc e
• Departure from the constant-period ephemeris for the transiting exoplanet WASP-12 b
• On the Orbit of Exoplanet WASP-12b
• The 8 Micron Phase Variation of the Hot Saturn HD 149026b
• WASP-12b as a prolate, inflated and disrupting planet from tidal dissipation
• Spitzer 3.6 micron and 4.5 micron full-orbit lightcurves of WASP-18
• Classification of magnetized star--planet interactions: bow shocks, tails, and inspiraling flows
• A New 24 micron Phase Curve for upsilon Andromedae b
• 3.6 and 4.5 $\mu$m $Spitzer$ Phase Curves of the Highly-Irradiated Hot Jupiters WASP-19b and HAT-P-7b
• Re-Evaluating WASP-12b: Strong Emission at 2.315 micron, Deeper Occultations, and an Isothermal Atmosphere
• On Correlated-noise Analyses Applied To Exoplanet Light Curves
• 3D Gas Dynamic Simulation of the Interaction Between the Exoplanet WASP-12b and Its Host Star
• Mass Transfer, Transiting Stream and Magnetopause in Close-in Exoplanetary Systems with Applications to WASP-12
• Variability in the Atmosphere of the Hot Giant Planet HAT-P-7 b
• Deciphering the Atmospheric Composition of WASP-12b: A Comprehensive Analysis of its Dayside Emission
• The Transit Light Curve Project. VII. The Not-So-Bloated Exoplanet HAT-P-1b
• Phase curves of WASP-33b and HD 149026b and a New Correlation Between Phase Curve Offset and Irradiation Temperature
• 3.6 and 4.5 $\mu$m Phase Curves of the Highly-Irradiated Eccentric Hot Jupiter WASP-14b
• Near-infrared Thermal Emission from WASP-12b: detections of the secondary eclipse in Ks, H & J
• Spitzer Secondary Eclipses of WASP-18b
• A HST/WFC3 Thermal Emission Spectrum of the Hot Jupiter HAT-P-7b
• TESS full orbital phase curve of the WASP-18b system
• The shocking transit of WASP-12b: Modelling the observed early ingress in the near ultraviolet
• Absorbing gas around the WASP-12 planetary system
• Transit Timing Variation Measurements of WASP-12b and Qatar-1b: No Evidence for Additional Planets
• Warm Spitzer Photometry of the Transiting Exoplanets CoRoT-1 and CoRoT-2 at Secondary Eclipse
• Repeatability and Accuracy of Exoplanet Eclipse Depths Measured with Post-Cryogenic Spitzer
• WASP-8b: Characterization of a Cool and Eccentric Exoplanet with Spitzer
• Spitzer/MIPS 24 micron Observations of HD 209458b: 3 eclipses, 2.5 transits, and a Phase Curve Corrupted by Instrumental Sensitivity Variations
• Detection of a Westward Hotspot Offset in the Atmosphere of a Hot Gas Giant CoRoT-2b
• Exoplanet Transit Variability: Bow Shocks and Winds Around HD 189733b
• A simple model of the reflection effect for the interacting binaries and extrasolar planets
• WASP-12b and HAT-P-8b are Members of Triple Star Systems
• Lightcurves of Stars & Exoplanets: Estimating Inclination, Obliquity, and Albedo
• Transit Variability in Bow Shock-Hosting Planets
• Hubble Space Telescope observations of the NUV transit of WASP-12b
• The Very Low Albedo of WASP-12b From Spectral Eclipse Observations with $\text{Hubble}$
• Distorted, non-spherical transiting planets: impact on the transit depth and on the radius determination
• Two nearby sub-Earth-sized exoplanet candidates in the GJ 436 system
• Forecasting the Impact of Stellar Activity on Transiting Exoplanet Spectra
• Understanding WASP-12b
• Mass-Loss Rates of "Hot-Jupiter" Exoplanets with Various Types of Gaseous Envelopes
• Types of Gaseous Envelopes of "Hot Jupiter" Exoplanets
• Investigation of the environment around close-in transiting exoplanets using CLOUDY
• Obliquity Tides May Drive WASP-12b's Rapid Orbital Decay
• Tidally Distorted Exoplanets: Density Corrections for Short-Period Hot-Jupiters based solely on Observable Parameters
• Direct Measure of Radiative and Dynamical Properties of an Exoplanet Atmosphere
• Generation of a Circumstellar Gas Disk by Hot Jupiter WASP-12b
• Spitzer IRAC Sparsely Sampled Phase Curve of the Exoplanet WASP-14b
• Planet-Induced Stellar Pulsations in HAT-P-2's Eccentric System
• Knot a Bad Idea: Testing BLISS Mapping for Spitzer Space Telescope Photometry

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• Thermal Phase Curves of XO-3b: an Eccentric Hot Jupiter at the Deuterium Burning Limit
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• Physically-motivated basis functions for temperature maps of exoplanets
• Phase curve and variability analysis of WASP-12b using TESS photometry
• Variability from thermo-resistive instability in the atmospheres of hot jupiters
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• The dark and featureless surface of rocky exoplanet LHS 3844 b from JWST mid-infrared spectroscopy
• TESS unveils the optical phase curve of KELT-1b. Thermal emission and ellipsoidal variation from the brown dwarf companion, and activity from the star
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