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Astrophysics > Solar and Stellar Astrophysics

arXiv:1312.6126 (astro-ph)
[Submitted on 20 Dec 2013]

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

Authors:C. S. Villarreal D'Angelo, E. M. Schneiter, A. Costa, P. Velázquez, A. Raga, A. Esquivel
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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] $\times10^{6}$ 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.
Subjects: Solar and Stellar Astrophysics (astro-ph.SR)
Cite as: arXiv:1312.6126 [astro-ph.SR]
  (or arXiv:1312.6126v1 [astro-ph.SR] for this version)
  https://doi.org/10.48550/arXiv.1312.6126
Related DOI: https://doi.org/10.1093/mnras/stt2303

Submission history

From: Carolina Villarreal D'Angelo [view email]
[v1] Fri, 20 Dec 2013 21:00:10 UTC (900 KB)
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