On spectroscopic phase-curve retrievals: H2 dissociation and thermal inversion in the atmosphere of the ultra-hot Jupiter WASP-103 b

Abstract

This work presents a re-analysis of the spectroscopic phase-curve observations of the ultra hot Jupiter WASP-103 b obtained by the Hubble Space Telescope (HST) and the Spitzer Telescope. Traditional 1D and unified 1.5D spectral retrieval techniques are employed, allowing to map the thermal structure and the abundances of trace gases in this planet as a function of longitude. On the day-side, the atmosphere is found to have a strong thermal inversion, with indications of thermal dissociation traced by continuum H- opacity. Water vapor is found across the entire atmosphere but with depleted abundances of around 1e-5, consistent with the thermal dissociation of this molecule. Regarding metal oxide and hydrides, FeH is detected on the hot-spot and the day-side of WASP-103 b, but TiO and VO are not present in detectable quantities. Carbon-bearing species such as CO and CH4 are also found, but since their detection is reliant on the combination of HST and Spizer, the retrieved abundances should be interpreted with caution. Free and Equilibrium chemistry retrievals are overall consistent, allowing to recover robust constraints on the metallicity and C/O ratio for this planet. The analyzed phase-curve data indicates that the atmosphere of WASP-103 b is consistent with solar elemental ratios.

Accepted in AJ, 21 pages, 15 figures, 2 animations

References in corpus (50)

• The Transiting Exoplanet Survey Satellite
• The Occurrence and Mass Distribution of Close-in Super-Earths, Neptunes, and Jupiters
• Origins of Eccentric Extrasolar Planets: Testing the Planet-Planet Scattering Model
• The imprint of exoplanet formation history on observable present-day spectra of hot Jupiters
• Thermal structure of an exoplanet atmosphere from phase-resolved emission spectroscopy
• Water Vapor in the Spectrum of the Extrasolar Planet HD 189733b: 1. the Transit
• Tau-REx I: A next generation retrieval code for exoplanetary atmospheres
• An ultrahot gas-giant exoplanet with a stratosphere
• Lyman-$\alpha$ Transit Spectroscopy and the Neutral Hydrogen Tail of the Hot Neptune GJ436b
• Mass-Metallicity Trends in Transiting Exoplanets from Atmospheric Abundances of H${}_2$O, Na, and K
• A spectral survey of an ultra-hot Jupiter: Detection of metals in the transmission spectrum of KELT-9 b
• Ocean Planet or Thick Atmosphere: On the Mass-Radius Relationship for Solid Exoplanets with Massive Atmospheres
• ExoMol line lists XVIII. The high temperature spectrum of VO
• ExoMol line lists -- XXXIX. Ro-vibrational molecular line list for CO${}_2$
• Five carbon- and nitrogen-bearing species in a hot giant planet's atmosphere
• Spitzer Phase Curve Constraints for WASP-43b at 3.6 and 4.5 microns
• Friends of Hot Jupiters. IV. Stellar companions beyond 50 AU might facilitate giant planet formation, but most are unlikely to cause Kozai-Lidov migration
• The interior and atmosphere of the habitable-zone exoplanet K2-18b
• Effects of a fully 3D atmospheric structure on exoplanet transmission spectra: retrieval biases due to day-night temperature gradients
• The Impact of Non-Uniform Thermal Structure on the Interpretation of Exoplanet Emission Spectra
• Climate of an Ultra hot Jupiter: Spectroscopic phase curve of WASP-18b with HST/WFC3
• ESPRESSO high resolution transmission spectroscopy of WASP-76b
• Water on Hot Rocky Exoplanets
• Water vapor in the spectrum of the extrasolar planet HD 189733b: 2. The eclipse
• An emission spectrum for WASP-121b measured across the 0.8-1.1 micron wavelength range using the Hubble Space Telescope
• A He I upper atmosphere around the warm Neptune GJ 3470b
• The origin of the high metallicity of close-in giant exoplanets: Combined effect of the resonant and aerodynamic shepherding
• ARES I: WASP-76 b, A Tale of Two HST Spectra
• The mid-infrared spectrum of the transiting exoplanet HD 209458b
• ACCESS & LRG-BEASTS: a precise new optical transmission spectrum of the ultrahot Jupiter WASP-103b
• ARES II: Characterising the Hot Jupiters WASP-127 b, WASP-79 b and WASP-62 b with HST
• Hubble WFC3 Spectroscopy of the Habitable-zone Super-Earth LHS 1140 b
• Confirmation of water emission in the dayside spectrum of the ultrahot Jupiter WASP-121b
• THOR: A New and Flexible Global Circulation Model to Explore Planetary Atmospheres
• Visible-light Phase Curves from the Second Year of the TESS Primary Mission
• ARES V: No Evidence For Molecular Absorption in the HST WFC3 Spectrum of GJ 1132 b
• Pressure-dependent water absorption cross sections for exoplanets and other atmospheres
• TESS unveils the phase curve of WASP-33b. Characterization of the planetary atmosphere and the pulsations from the star
• Signs of strong Na and K absorption in the transmission spectrum of WASP-103b
• Constraining mornings & evenings on distant worlds: a new semi-analytical approach and prospects with transmission spectroscopy
• 2D Retrieval Frameworks for Hot Jupiter Phase Curves
• The Hubble WFC3 Emission Spectrum of the Extremely-Hot Jupiter, KELT-9b
• ARES IV: Probing the atmospheres of the two warm small planets HD 106315 c and HD 3167 c with the HST/WFC3 camera
• Ground-Based Transmission Spectroscopy with FORS2: A featureless optical transmission spectrum and detection of H${}_2$O for the ultra-hot Jupiter WASP-103b
• H- and Dissociation in Ultra-hot Jupiters: A Retrieval Case Study of WASP-18b
• Formation of aqua planets with water of nebular origin: Effects of water enrichment on the structure and mass of captured atmospheres of terrestrial planets
• TauREx3 PhaseCurve: A 1.5D model for phase curve description
• A new approach to spectroscopic phase curves: The emission spectrum of WASP-12b observed in quadrature with HST/WFC3
• Longitudinally Resolved Spectral Retrieval (ReSpect) of WASP-43b
• Thermal Phase Curves of XO-3b: an Eccentric Hot Jupiter at the Deuterium Burning Limit

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