Comparative Planetology of Magnetic Effects in Ultrahot Jupiters: Trends in High-resolution Spectroscopy
Ultrahot Jupiters (UHJs), being the hottest class of exoplanets known, provide a unique laboratory for testing atmospheric interactions with internal planetary magnetic fields at a large range of temperatures. Thermal ionization of atmospheric species on the dayside of these planets results in charg...
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IOP Publishing
2024-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ad7ded |
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| author | Hayley Beltz Emily Rauscher |
| author_facet | Hayley Beltz Emily Rauscher |
| author_sort | Hayley Beltz |
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| description | Ultrahot Jupiters (UHJs), being the hottest class of exoplanets known, provide a unique laboratory for testing atmospheric interactions with internal planetary magnetic fields at a large range of temperatures. Thermal ionization of atmospheric species on the dayside of these planets results in charged particles becoming embedded in the planet’s mostly neutral wind. The charges will resist flow across magnetic field lines as they are dragged around the planet and ultimately alter the circulation pattern of the atmosphere. We model this process to study this effect on high-resolution emission and transmission spectra in order to identify observational signatures of the magnetic circulation regime that exist across multiple UHJs. Using a state-of-the-art kinematic MHD/active drag approach in a 3D atmospheric model, we simulate three different UHJs with and without magnetic effects. We postprocess these models to generate high-resolution emission and transmission spectra and explore trends in the net Doppler shift as a function of phase. In emission spectra, we find that the net Doppler shift before and after secondary eclipse can be influenced by the presence of magnetic drag and the wavelength choice. Trends in transmission spectra show our active drag models consistently produce a unique shape in their Doppler shift trends that differs from the models without active drag. This work is a critical theoretical step to understanding how magnetic fields shape the atmospheres of UHJs and provides some of the first predictions in high-resolution spectroscopy for observing these effects. |
| format | Article |
| id | doaj-art-9dc3b2d6951a40fca07371f650b53712 |
| institution | Kabale University |
| issn | 1538-4357 |
| language | English |
| publishDate | 2024-01-01 |
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| series | The Astrophysical Journal |
| spelling | doaj-art-9dc3b2d6951a40fca07371f650b537122024-11-12T11:00:31ZengIOP PublishingThe Astrophysical Journal1538-43572024-01-0197613210.3847/1538-4357/ad7dedComparative Planetology of Magnetic Effects in Ultrahot Jupiters: Trends in High-resolution SpectroscopyHayley Beltz0https://orcid.org/0000-0002-6980-052XEmily Rauscher1https://orcid.org/0000-0003-3963-9672Department of Astronomy, University of Maryland , College Park, MD 20742, USA ; hbeltz@umd.eduDepartment of Astronomy, University of Michigan , Ann Arbor, MI 48109, USAUltrahot Jupiters (UHJs), being the hottest class of exoplanets known, provide a unique laboratory for testing atmospheric interactions with internal planetary magnetic fields at a large range of temperatures. Thermal ionization of atmospheric species on the dayside of these planets results in charged particles becoming embedded in the planet’s mostly neutral wind. The charges will resist flow across magnetic field lines as they are dragged around the planet and ultimately alter the circulation pattern of the atmosphere. We model this process to study this effect on high-resolution emission and transmission spectra in order to identify observational signatures of the magnetic circulation regime that exist across multiple UHJs. Using a state-of-the-art kinematic MHD/active drag approach in a 3D atmospheric model, we simulate three different UHJs with and without magnetic effects. We postprocess these models to generate high-resolution emission and transmission spectra and explore trends in the net Doppler shift as a function of phase. In emission spectra, we find that the net Doppler shift before and after secondary eclipse can be influenced by the presence of magnetic drag and the wavelength choice. Trends in transmission spectra show our active drag models consistently produce a unique shape in their Doppler shift trends that differs from the models without active drag. This work is a critical theoretical step to understanding how magnetic fields shape the atmospheres of UHJs and provides some of the first predictions in high-resolution spectroscopy for observing these effects.https://doi.org/10.3847/1538-4357/ad7dedExoplanet atmospheresExoplanet atmospheric dynamicsHot JupitersMagnetohydrodynamical simulations |
| spellingShingle | Hayley Beltz Emily Rauscher Comparative Planetology of Magnetic Effects in Ultrahot Jupiters: Trends in High-resolution Spectroscopy The Astrophysical Journal Exoplanet atmospheres Exoplanet atmospheric dynamics Hot Jupiters Magnetohydrodynamical simulations |
| title | Comparative Planetology of Magnetic Effects in Ultrahot Jupiters: Trends in High-resolution Spectroscopy |
| title_full | Comparative Planetology of Magnetic Effects in Ultrahot Jupiters: Trends in High-resolution Spectroscopy |
| title_fullStr | Comparative Planetology of Magnetic Effects in Ultrahot Jupiters: Trends in High-resolution Spectroscopy |
| title_full_unstemmed | Comparative Planetology of Magnetic Effects in Ultrahot Jupiters: Trends in High-resolution Spectroscopy |
| title_short | Comparative Planetology of Magnetic Effects in Ultrahot Jupiters: Trends in High-resolution Spectroscopy |
| title_sort | comparative planetology of magnetic effects in ultrahot jupiters trends in high resolution spectroscopy |
| topic | Exoplanet atmospheres Exoplanet atmospheric dynamics Hot Jupiters Magnetohydrodynamical simulations |
| url | https://doi.org/10.3847/1538-4357/ad7ded |
| work_keys_str_mv | AT hayleybeltz comparativeplanetologyofmagneticeffectsinultrahotjupiterstrendsinhighresolutionspectroscopy AT emilyrauscher comparativeplanetologyofmagneticeffectsinultrahotjupiterstrendsinhighresolutionspectroscopy |