Magnetic Drag and 3-D Effects in Theoretical High-Resolution Emission Spectra of Ultrahot Jupiters: the Case of WASP-76b

Abstract

Ultrahot Jupiters are ideal candidates to explore with high-resolution emission spectra. Detailed theoretical studies are necessary to investigate the range of spectra we can expect to see from these objects throughout their orbit, because of the extreme temperature and chemical longitudinal gradients that exist across day and nightside regions. Using previously published 3D GCM models of WASP-76b with different treatments of magnetic drag, we post-process the 3D atmospheres to generate high-resolution emission spectra for two wavelength ranges and throughout the planet's orbit. We find that the high-resolution emission spectra vary strongly as a function of phase, at times showing emission features, absorption features, or both, which are a direct result of the 3D structure of the planet. At phases exhibiting both emission and absorption features, the Doppler shift differs in direction between the two spectral features, making them differentiable instead of canceling each other out. Through the use of cross-correlation, we find different patterns in net Doppler shift for models with different treatments of drag: the nightside spectra show opposite signs in their Doppler shift, while the dayside phases have a reversal in the trend of net shift with phase. Finally, we caution researchers from using a single spectral template throughout the planet's orbit; this can bias the corresponding net Doppler shift returned, as it can pick up on a bright region on the edge of the planet disk that is highly red- or blue-shifted.

arXiv comment15 pages, 9 figures (including one animated figure), Accepted to AJ; Link to animated figure: https://www.youtube.com/watch?v=KnghwJdZxHE

References in corpus (82)

• The orbital motion, absolute mass, and high-altitude winds of exoplanet HD209458b
• A Unified Theory for the Atmospheres of the Hot and Very Hot Jupiters: Two Classes of Irradiated Atmospheres
• Atmospheric Circulation and Tides of "51Peg b-like" Planets
• On the radiative equilibrium of irradiated planetary atmospheres
• A Possible Bifurcation in Atmospheres of Strongly Irradiated Stars and Planets
• The Mass-Metallicity Relation for Giant Planets
• The fast spin-rotation of a young extrasolar planet
• A Precise Water Abundance Measurement for the Hot Jupiter WASP-43b
• From thermal dissociation to condensation in the atmospheres of ultra hot Jupiters: WASP-121b in context
• Nightside condensation of iron in an ultra-hot giant exoplanet
• Inflating Hot Jupiters With Ohmic Dissipation
• Retrieving Temperatures and Abundances of Exoplanet Atmospheres with High-Resolution Cross-Correlation Spectroscopy
• Extremely Irradiated Hot Jupiters: Non-Oxide Inversions, H- Opacity, and Thermal Dissociation of Molecules
• Rotation and winds of exoplanet HD 189733 b measured with high-dispersion transmission spectroscopy
• Model atmospheres of irradiated exoplanets: The influence of stellar parameters, metallicity, and the C/O ratio
• Detection of Fe I in the atmosphere of the ultra-hot Jupiter WASP-121b, and a new likelihood-based approach for Doppler-resolved spectroscopy
• Magnetic Drag on Hot Jupiter Atmospheric Winds
• Bayesian Analysis of Hot Jupiter Radius Anomalies: Evidence for Ohmic Dissipation?
• Atmospheric Heat Redistribution on Hot Jupiters
• A solar C/O and sub-solar metallicity in a hot Jupiter atmosphere
• Carbon monoxide and water vapor in the atmosphere of the non-transiting exoplanet HD 179949 b
• Five carbon- and nitrogen-bearing species in a hot giant planet's atmosphere
• Three-Dimensional Atmospheric Circulation Models of HD 189733b and HD 209458b with Consistent Magnetic Drag and Ohmic Dissipation
• A General Circulation Model for Gaseous Exoplanets with Double-Gray Radiative Transfer
• Increased Heat Transport in Ultra-Hot Jupiter Atmospheres Through H${}_2$ Dissociation/Recombination
• The Atmospheric Circulation of Ultra-hot Jupiters
• Ohmic Dissipation in the Atmospheres of Hot Jupiters
• Magnetic Scaling Laws for the Atmospheres of Hot Giant Exoplanets
• Magnetic field strengths of hot Jupiters from signals of star-planet interactions
• Constraining High Speed Winds in Exoplanet Atmospheres Through Observations of Anomalous Doppler Shifts During Transit
• Connecting Giant Planet Atmosphere and Interior Modeling: Constraints on Atmospheric Metal Enrichment
• Hot Exoplanet Atmospheres Resolved with Transit Spectroscopy (HEARTS) - II. A broadened sodium feature on the ultra-hot giant WASP-76b
• Magnetic Effects in Hot Jupiter Atmospheres
• 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
• Magnetohydrodynamic Simulations of the Atmosphere of HD 209458b
• Where is the Water? Jupiter-like C/H ratio but strong H${}_2$O depletion found on $\tau$ Boötis b using SPIRou
• Titanium oxide and chemical inhomogeneity in the atmosphere of the exoplanet WASP-189b
• The High-Resolution Transmission Spectrum of HD 189733b Interpreted with Atmospheric Doppler Shifts from Three-Dimensional General Circulation Models
• Retrieval of Exoplanet Emission Spectra with HyDRA
• ESPRESSO high resolution transmission spectroscopy of WASP-76b
• Decomposing the Iron Cross-Correlation Signal of the Ultra-Hot Jupiter WASP-76b in Transmission using 3D Monte-Carlo Radiative Transfer
• The slow spin of the young sub-stellar companion GQ Lupi b and its orbital configuration
• An Atomic Spectral Survey of WASP-76b: Resolving Chemical Gradients and Asymmetries
• Exoplanet atmospheres with GIANO II. Detection of molecular absorption in the dayside spectrum of HD 102195b
• Clouds in Three-Dimensional Models of Hot Jupiters Over a Wide Range of Temperatures I: Thermal Structures and Broadband Phase Curve Predictions
• Understanding and Mitigating Biases when Studying Inhomogeneous Emission Spectra with JWST
• New Avenues for Thermal Inversions in hot Jupiters
• Connecting planet formation and astrochemistry: A main sequence for C/O in hot-exoplanetary atmospheres
• Magnetically Controlled Circulation on Hot Extrasolar Planets
• Strong biases in retrieved atmospheric composition caused by strong day-night chemical heterogeneities
• Estimating the magnetic field strength in hot Jupiters
• Exploring the Effects of Active Magnetic Drag in a GCM of the Ultra-Hot Jupiter WASP-76b
• A unique hot Jupiter spectral sequence with evidence for compositional diversity
• Confirmation of Asymmetric Iron Absorption in WASP-76b with HARPS
• First Detection of Hydroxyl Radical Emission from an Exoplanet Atmosphere: High-dispersion Characterization of WASP-33b using Subaru/IRD
• TRIDENT: A Rapid 3D Radiative Transfer Model for Exoplanet Transmission Spectra
• Detection of Fe and evidence for TiO in the dayside emission spectrum of WASP-33b
• Signatures of Strong Magnetization and Metal-Poor Atmosphere for a Neptune-Size Exoplanet
• A transition between the hot and the ultra-hot Jupiter atmospheres
• A Significant Increase in Detection of High-Resolution Emission Spectra Using a Three-Dimensional Atmospheric Model of a Hot Jupiter
• Non-local thermodynamic equilibrium effects determine the upper atmospheric temperature structure of the ultra-hot Jupiter KELT-9b
• Circulation and Dissipation on Hot Jupiters
• Obliquity Constraints on an Extrasolar Planetary-Mass Companion
• Detection of Fe\,{\sc i} Emission in the Day-side Spectrum of WASP-33b
• No umbrella needed: Confronting the hypothesis of iron rain on WASP-76b with post-processed general circulation models
• The Implications of 3D Thermal Structure on 1D Atmospheric Retrieval
• Modeling the effects of inhomogeneous aerosols on the hot Jupiter Kepler-7b's atmospheric circulation
• 3D radiative-transfer for exoplanet atmospheres. gCMCRT: a GPU accelerated MCRT code
• Detection of OH in the ultra-hot Jupiter WASP-76b
• The Hubble PanCET program: Transit and Eclipse Spectroscopy of the Strongly Irradiated Giant Exoplanet WASP-76b
• Confirmation of Iron Emission Lines and Non-detection of TiO on the Dayside of KELT-9b with MAROON-X
• Constraining Hot Jupiter Atmospheric Structure and Dynamics through Doppler Shifted Emission Spectra
• THOR 2.0: Major Improvements to the Open-Source General Circulation Model
• Extremely long convergence times in a 3D GCM simulation of the sub-Neptune Gliese 1214b
• The hottest hot Jupiters may host Atmospheric Dynamos
• Detection of Ionized Calcium in the Atmosphere of the Ultra-Hot Jupiter WASP-76b
• Modeling the high-resolution emission spectra of clear and cloudy non-transiting hot Jupiters
• Signatures of Clouds in Hot Jupiter Atmospheres: Modeled High Resolution Emission Spectra from 3D General Circulation Models
• Reassessing the Evidence for Time Variability in the Atmosphere of the Exoplanet HAT-P-7 b
• Day-side Fe I Emission, Day-Night Brightness Contrast and Phase Offset of the Exoplanet WASP-33b
• CARMENES detection of the CaII infrared triplet and possible evidence of HeI in the atmosphere of WASP-76b

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