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Träfflista för sökning "WFRF:(D'Angelo M) srt2:(2015-2019)"

Sökning: WFRF:(D'Angelo M) > (2015-2019)

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  • Esquivel, A., et al. (författare)
  • Hydrodynamical interaction of stellar and planetary winds : effects of charge exchange and radiation pressure on the observed Ly alpha absorption
  • 2019
  • Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 487:4, s. 5788-5798
  • Tidskriftsartikel (refereegranskat)abstract
    • Lyman alpha observations of the transiting exoplanet HD209458b enable the study of exoplanet exospheres exposed to stellar extreme ultraviolet (EUV) fluxes, as well as the interacting stellar wind properties. In this study we present 3D hydrodynamical models for the stellar-planetary wind interaction including radiation pressure and charge exchange, together with photoionization, recombination, and collisional ionization processes. Our models explore the contribution of the radiation pressure and charge exchange to the Ly alpha absorption profile in a hydrodynamical framework, and for a single set of stellar wind parameters appropriate for HD209458. We find that most of the absorption is produced by the material from the planet, with a secondary contribution of neutralized stellar ions by charge exchange. At the same time, the hydrodynamic shock heats up the planetary material, resulting in a broad thermal profile. Meanwhile, the radiation pressure yields a small velocity shift of the absorbing material. While neither charge exchange nor radiation pressure provides enough neutrals at the velocity needed to explain the observations at -100kms(-1) individually, we find that the two effects combined with the broad thermal profile are able to explain the observations.
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3.
  • Giacomozzi, Linda, et al. (författare)
  • Decay pathways for protonated and deprotonated adenine molecules
  • 2019
  • Ingår i: Journal of Chemical Physics. - : AIP Publishing. - 0021-9606 .- 1089-7690. ; 151:4
  • Tidskriftsartikel (refereegranskat)abstract
    • We have measured fragment mass spectra and total destruction cross sections for protonated and deprotonated adenine following collisions with He at center-of-mass energies in the 20-240 eV range. Classical and ab initio molecular dynamics simulations are used to provide detailed information on the fragmentation pathways and suggest a range of alternative routes compared to those reported in earlier studies. These new pathways involve, for instance, losses of HNC molecules from protonated adenine and losses of NH2 or C3H2N2 from deprotonated adenine. The present results may be important to advance the understanding of how biomolecules may be formed and processed in various astrophysical environments.
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