Effects of Charge Exchange on the Evaporative Wind of HD 209458b
arXiv:2201.07337 · doi:10.1093/mnras/stac112
Abstract
The role of charge exchange in shaping exoplanet photoevaporation remains a topic of contention. Exchange of electrons between stellar wind protons from the exoplanet's host star and neutral hydrogen from the planet's wind has been proposed as a mechanism to create "energetic neutral atoms" (ENAs), which could explain the high absorption line velocities observed in systems where mass loss is occurring. In this paper we present results from 3D hydrodynamic simulations of the mass loss of a planet similar to HD 209458b. We self-consistently launch a planetary wind by calculating the ionization and heating resulting from incident high-energy radiation, inject a stellar wind into the simulation, and allow electron exchange between the stellar and planetary winds. We predict the potential production of ENAs by the wind-wind interaction analytically, then present the results of our simulations, which confirm the analytic limits. Within the limits of our hydrodynamic simulation, we find that charge exchange with the stellar wind properties examined here is unable to explain the absorption observed at high Doppler velocities.
arXiv commentarXiv admin note: text overlap with arXiv:1906.00075
References in corpus (15)
- 3D model of hydrogen atmospheric escape from HD209458b and HD189733b: radiative blow-out and stellar wind interactions
- Energetic neutral atoms as the explanation for the high velocity hydrogen around HD 209458b
- An evaporating planet in the wind: stellar wind interactions with the radiatively braked exosphere of GJ436 b
- Magnetic moment and plasma environment of HD 209458b as determined from Ly observations
- Simulating Magnetohydrodynamical Flow with Constrained Transport and Adaptive Mesh Refinement; Algorithms & Tests of the AstroBEAR Code
- Colliding Planetary and Stellar Winds: Charge Exchange and Transit Spectroscopy in Neutral Hydrogen
- Morphology of Hydrodynamic Winds: A Study of Planetary Winds in Stellar Environments
- Global 3D hydrodynamic modeling of in-transit Lyα absorption of GJ436b
- Two regimes of interaction of a Hot Jupiter's escaping atmosphere with the stellar wind and generation of energized atomic hydrogen corona
- Lyα Absorption at Transits of HD 209458b: A Comparative Study of Various Mechanisms Under Different Conditions
- Hot planetary winds near a star: dynamics, wind-wind interactions, and observational signatures
- Axisymmetric Simulations of Hot Jupiter-Stellar Wind Hydrodynamic Interaction
- Photo-ionization of planetary winds: case study HD209458b
- Effects of Radiation Pressure on the Evaporative Wind of HD 209458b
- Hydrodynamical interaction of stellar and planetary winds: effects of charge exchange and radiation pressure on the observed Ly absorption