On the sensitivity of extrasolar mass-loss rate ranges: HD 209458b a case study

Abstract

We present a 3D hydrodynamic study of the effects that different stellar wind conditions and planetary wind structures have on the calculated Ly-$\alpha$ absorptions produced during the transit of HD 209458b. Considering a range of stellar wind speeds $\sim$[350-800] km s${}^{-1}$, coronal temperature $\sim$[3-7] $\times 10^6$ K and two values of the polytropic index $\Gamma$ $\sim$[1.01-1.13], while keeping fixed the stellar mass loss rate, we found a that a ${\dot{M}}_p$ range between $\sim$[3-5] $\times 10^{10}$g s${}^{-1}$ give account for the observational absorption in Ly-$\alpha$ measured for the planetary system. Also, several models with anisotropic evaporation profiles for the planetary escaping atmosphere were carried out, showing that both, the escape through polar regions and through the night side yields larger absorptions than an isotropic planetary wind.

References in corpus (7)

• Early UV Ingress in WASP-12b: Measuring Planetary Magnetic Fields
• Energetic neutral atoms as the explanation for the high velocity hydrogen around HD 209458b
• Exoplanet HD 209458b : Evaporation strengthened
• Exoplanet HD209458b: inflated hydrogen atmosphere but no sign of evaporation
• The shocking transit of WASP-12b: Modelling the observed early ingress in the near ultraviolet
• Escaping Particle fluxes in the atmospheres of close-in exoplanets: I. model of hydrogen
• Spectral, Spatial, and Time properties of the hydrogen nebula around exoplanet HD209458b

Cited by in corpus (20)

• A New Window into Escaping Exoplanet Atmospheres: 10830 Å Line of Helium
• Magnetic moment and plasma environment of HD 209458b as determined from Ly$\alpha$ observations
• The evolution of the solar wind
• On the environment surrounding close-in exoplanets
• Stellar wind effects on the atmospheres of close-in giants: a possible reduction in escape instead of increased erosion
• Magnetised winds and their influence in the escaping upper atmosphere of HD 209458b
• Stellar Wind Confinement of Evaporating Exoplanet Atmospheres and its Signatures in 1083 nm Observations
• Characterisation of the HD219134 multi-planet system II. Stellar-wind sputtered exospheres in rocky planets b & c
• Photo-ionization of planetary winds: case study HD209458b
• GJ 436b and the stellar wind interaction: simulations constraints using Ly$\alpha$ and H$\alpha$ transits
• Stellar Winds Drive Strong Variations in Exoplanet Evaporative Outflows and Transit Absorption Signatures
• Hydrodynamical interaction of stellar and planetary winds: effects of charge exchange and radiation pressure on the observed Ly$\alpha$ absorption
• The space weather around the exoplanet GJ 436 b. II. Stellar wind-exoplanet interactions
• Evolution of helium triplet transits of close-in gas giants orbiting K-dwarfs
• Star-Planet Interactions: A Computational View
• Stellar Wind Effect on the Atmospheric Escape of Hot Jupiters and their Ly-$\alpha$ and H$\alpha$ transits
• The multi-planet system TOI-421 -- A warm Neptune and a super puffy mini-Neptune transiting a G9 V star in a visual binary
• Planetary transits at radio wavelengths: secondary eclipses of hot Jupiter extended atmospheres
• Star-planet interaction through spectral lines
• Corotating Interaction Regions (CIRs): evolution over a solar lifetime