Two regimes of interaction of a Hot Jupiter's escaping atmosphere with the stellar wind and generation of energized atomic hydrogen corona

Abstract

The interaction of escaping upper atmosphere of a hydrogen rich non-magnetized analog of HD209458b with a stellar wind of its host G-type star at different orbital distances is simulated with a 2D axisymmetric multi-fluid hydrodynamic model. A realistic sun-like spectrum of XUV radiation which ionizes and heats the planetary atmosphere, hydrogen photo-chemistry, as well as stellar-planetary tidal interaction are taken into account to generate self-consistently an atmospheric hydrodynamic outflow. Two different regimes of the planetary and stellar winds interaction have been modelled. These are: 1) the "captured by the star" regime, when the tidal force and pressure gradient drive the planetary material beyond the Roche lobe towards the star, and 2) the "blown by the wind" regime, when sufficiently strong stellar wind confines the escaping planetary atmosphere and channels it into the tail. The model simulates in details the hydrodynamic interaction between the planetary atoms, protons and the stellar wind, as well as the production of energetic neutral atoms (ENAs) around the planet due to charge-exchange between planetary atoms and stellar protons. The revealed location and shape of the ENA cloud either as a paraboloid shell between ionopause and bowshock (for the "blown by the wind" regime), or a turbulent layer at the contact boundary between the planetary stream and stellar wind (for the "captured by the star" regime) are of importance for the interpretation of Lyα absorption features in exoplanetary transit spectra and characterization of the plasma environments.

Published on ApJ

References in corpus (16)

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Cited by in corpus (28)

• Hubble PanCET: An extended upper atmosphere of neutral hydrogen around the warm Neptune GJ 3470 b
• Stellar wind effects on the atmospheres of close-in giants: a possible reduction in escape instead of increased erosion
• Signatures of Strong Magnetization and Metal-Poor Atmosphere for a Neptune-Size Exoplanet
• Hydrogen dominated atmospheres on terrestrial mass planets: evidence, origin and evolution
• Global 3D hydrodynamic modeling of in-transit Lyα absorption of GJ436b
• Stellar Wind Confinement of Evaporating Exoplanet Atmospheres and its Signatures in 1083 nm Observations
• Lyα Absorption at Transits of HD 209458b: A Comparative Study of Various Mechanisms Under Different Conditions
• Effects of the stellar wind on the Ly-alpha transit of close-in planets
• The Effects of Magnetic Fields on Observational Signatures of Atmospheric Escape in Exoplanets: Double Tail Structures
• The impact of intrinsic magnetic field on the absorption signatures of elements probing the upper atmosphere of HD209458b
• Effect of stellar wind induced magnetic fields on planetary obstacles of non-magnetized hot Jupiters
• Global 3D simulation of the upper atmosphere of HD189733b and absorption in metastable HeI and Lyα lines
• Three-dimensional hydrodynamic simulations of the upper atmosphere of $\pi$ Men c: comparison with Ly$\alpha$ transit observations
• Modeling the Ly$\alpha$ transit absorption of the hot Jupiter HD 189733b
• Hydrodynamical interaction of stellar and planetary winds: effects of charge exchange and radiation pressure on the observed Ly$\alpha$ absorption
• Modeling H$\alpha$ and He 10830 transmission spectrum of WASP-52b
• On the origin of the non-detection of metastable HeI in the upper atmosphere of the hot Jupiter WASP-80b
• Space Weather-driven Variations in Ly$\alpha$ Absorption Signatures of Exoplanet Atmospheric Escape: MHD Simulations and the Case of AU Mic b
• Planet(esimal)s Around Stars with TESS (PAST) III: A Search for Triplet He I in the Atmospheres of Two 200 Myr-old Planets
• Three-dimensional modelling of absorption by various species for hot Jupiter HD 209458b
• Transit Ly-$\alpha$ signatures of terrestrial planets in the habitable zones of M dwarfs
• Modelling atmospheric escape and MgII near-ultraviolet absorption of the highly irradiated hot Jupiter WASP-12b
• Magnetohydrodynamic modelling of star-planet interaction and associated auroral radio emission
• Unraveling the evolution of hot Jupiter systems under the effect of tidal and magnetic interactions and mass loss
• Atmospheric escape in hot Jupiters under sub-Alfvénic interactions
• Effects of Charge Exchange on the Evaporative Wind of HD 209458b
• Orbital Evolution of Close-in Super-Earths Driven by Atmospheric Escape
• Evolution of Earth-like extended exospheres orbiting solar-like stars