A Global Perspective with Updated Constraints on the Ultra-hot Jupiter WASP-19b: Atmospheric Properties and Stellar Activity

Abstract

We present a detailed reanalysis of the atmospheric properties of WASP-19b, an ultra-hot Jupiter (1.14 M Jup, 1.41 R Jup) orbiting an active Sun-like star every 0.79 day. We reanalyze a transit and secondary eclipse of WASP-19b observed by the Hubble Space Telescope's Wide Field Camera 3 spectrograph (1.1 - 1.7 microns). When combined with Spitzer photometry at longer wavelengths, our analyses indicate the presence of water absorption features in both the planet's transmission and emission spectra, consistent with results from previously published studies. We jointly fit WASP-19b's dayside emission and transmission spectra with a retrieval model in order to constrain its atmospheric composition, and explore the effect of stellar activity on its transmission spectrum in greater depth. We also compare our dayside emission spectrum to predictions from a general circulation model, and conclude that magnetic drag appears to be relatively unimportant in shaping WASP-19b's atmospheric circulation. Lastly, we compare the size of WASP-19b's dayside water absorption feature to the population of hot Jupiters with similar measurements, and show that it is located in the transitional irradiation regime where temperature inversions first begin to emerge. As in previous studies, we find that the current observations provide relatively weak constraints on this planet's atmospheric properties. These constraints could be significantly improved by the addition of spectroscopically resolved observations at longer wavelengths with JWST/NIRSpec PRISM.

References in corpus (64)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Astropy: A Community Python Package for Astronomy
• emcee: The MCMC Hammer
• The NumPy array: a structure for efficient numerical computation
• A new extensive library of PHOENIX stellar atmospheres and synthetic spectra
• Detection of an Extrasolar Planet Atmosphere
• A continuum from clear to cloudy hot-Jupiter exoplanets without primordial water depletion
• Clouds in the atmosphere of the super-Earth exoplanet GJ 1214b
• Infrared radiation from an extrasolar planet
• A Possible Bifurcation in Atmospheres of Strongly Irradiated Stars and Planets
• Hubble Space Telescope Transmission Spectroscopy of the Exoplanet HD 189733b: High-altitude atmospheric haze in the optical and near-UV with STIS
• A Precise Water Abundance Measurement for the Hot Jupiter WASP-43b
• The Transit Light Source Effect: False Spectral Features and Incorrect Densities for M-dwarf Transiting Planets
• A Systematic Retrieval Analysis of Secondary Eclipse Spectra I: A Comparison of Atmospheric Retrieval Techniques
• 3D mixing in hot Jupiter atmospheres. I. application to the day/night cold trap in HD 209458b
• The Flat Transmission Spectrum of the Super-Earth GJ1214b from Wide Field Camera 3 on the Hubble Space Telescope
• 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
• A population study of gaseous exoplanets
• Early Release Science of the exoplanet WASP-39b with JWST NIRSpec PRISM
• Chemical consequences of the C/O ratio on hot Jupiters: Examples from WASP-12b,CoRoT-2b, XO-1b, and HD 189733b
• Inflating Hot Jupiters With Ohmic Dissipation
• Extremely Irradiated Hot Jupiters: Non-Oxide Inversions, H- Opacity, and Thermal Dissociation of Molecules
• WASP-19b: the shortest period transiting exoplanet yet discovered
• H${}_2$O abundances and cloud properties in ten hot giant exoplanets
• A consistent retrieval analysis of 10 Hot Jupiters observed in transmission
• Detection of titanium oxide in the atmosphere of a hot Jupiter
• An HST Optical to Near-IR Transmission Spectrum of the Hot Jupiter WASP-19b: Detection of Atmospheric Water and Likely Absence of TiO
• The atmospheric circulation of a nine-hot Jupiter sample: Probing circulation and chemistry over a wide phase space
• The Deep Blue Color of HD189733b: Albedo Measurements with Hubble Space Telescope/Space Telescope Imaging Spectrograph at Visible Wavelengths
• Increased Heat Transport in Ultra-Hot Jupiter Atmospheres Through H${}_2$ Dissociation/Recombination
• An optical transmission spectrum for the ultra-hot Jupiter WASP-121b measured with the Hubble Space Telescope
• Habitable Climates: The Influence of Obliquity
• ACCESS: A featureless optical transmission spectrum for WASP-19b from Magellan/IMACS
• Exoplanet Transit Spectroscopy Using WFC3: WASP-12 b, WASP-17 b, and WASP-19 b
• A broadband thermal emission spectrum of the ultra-hot Jupiter WASP-18b
• 3.6 and 4.5 $\mu$m $Spitzer$ Phase Curves of the Highly-Irradiated Hot Jupiters WASP-19b and HAT-P-7b
• Ohmic Dissipation in the Atmospheres of Hot Jupiters
• Atmospheres from very low-mass stars to extrasolar planets
• The cloudy shape of hot Jupiter thermal phase curves
• Forward modelling and retrievals with PLATON, a fast open source tool
• PLATON II: New Capabilities And A Comprehensive Retrieval on HD 189733b Transit and Eclipse Data
• A Physical Model-based Correction for Charge Traps in the Hubble Space Telescope's Wide Field Camera 3 Near-IR Detector and Applications to Transiting Exoplanets and Brown Dwarfs
• Five key exoplanet questions answered via the analysis of 25 hot Jupiter atmospheres in eclipse
• Clouds in Three-Dimensional Models of Hot Jupiters Over a Wide Range of Temperatures I: Thermal Structures and Broadband Phase Curve Predictions
• Warm Spitzer Photometry of the Transiting Exoplanets CoRoT-1 and CoRoT-2 at Secondary Eclipse
• An emission spectrum for WASP-121b measured across the 0.8-1.1 micron wavelength range using the Hubble Space Telescope
• A unique hot Jupiter spectral sequence with evidence for compositional diversity
• Atmospheric Circulation and Composition of GJ1214b
• Marginalising instrument systematics in HST WFC3 transit lightcurves
• VLT/FORS2 comparative transmission spectroscopy II: confirmation of a cloud-deck and Rayleigh scattering in WASP-31b, but no potassium?
• Ground-Based Transit Spectroscopy of the Hot-Jupiter WASP-19b in the Near-Infrared
• Modeled Temperature-Dependent Clouds with Radiative Feedback in Hot Jupiter Atmospheres
• A photometric study of the hot exoplanet WASP-19b
• TraMoS V. Updated ephemeris and multi-epoch monitoring of the hot Jupiters WASP-18Ab, WASP-19b, and WASP-77Ab
• Thermal emission at 3.6-8 micron from WASP-19b: a hot Jupiter without a stratosphere orbiting an active star
• The post-transit tail of WASP-107b observed at 10830A
• A Spectral Survey of WASP-19b with ESPRESSO
• $TESS$ Phase Curve of the Hot Jupiter WASP-19b
• The very low mass multiple system LHS\,1070 -- a testbed for model atmospheres for the lower end of the main sequence
• Observational Consequences of Shallow-water Magnetohydrodynamics on Hot Jupiters
• The Hubble PanCET program: Transit and Eclipse Spectroscopy of the Hot Jupiter WASP-74b
• A dayside thermal inversion in the atmosphere of WASP-19b
• The Hubble PanCET program: Emission spectrum of hot Jupiter HAT-P-41b