X-rays from accretion shocks in classical T Tauri stars: 2D MHD modeling and the role of local absorption

Marco Miceli, Rosaria Bonito, Costanza Argiroffi, Giovanni Peres, Fabio Reale, Matsakos, Ibgui, Sthelé, Argiroffi, Fabio Reale, Orlando, Giovanni Peres, Miceli

Risultato della ricerca: Otherpeer review

Abstract

In classical T Tauri stars (CTTS) strong shocks are formed where the accretion funnel impacts with the denser stellar chromosphere. Although current models of accretion provide a plausible global picture of this process, some fundamental aspects are still unclear: the observed X-ray luminosity in accretion shocks is order of magnitudes lower than predicted; the observed density and temperature structures of the hot post-shock region are puzzling and still unexplained by models. To address these issues we performed 2D MHD simulations describing an accretion stream impacting onto the chromosphere of a CTTS, exploring different configurations and strengths of the magnetic field. From the model results we then synthesized the X-ray emission emerging from the hot post-shock, taking into account the local absorption due to the pre-shock stream and surrounding atmosphere. We find that the different configurations and strengths of the magnetic field profoundly affect the hot post-shock properties. Moreover the emerging X-ray emission strongly depends also on the viewing angle under which accretion is observed. Some of the explored configuration are able to reproduce the observed features of X-ray spectra of CTTS. © International Astronomical Union 2014.
Lingua originaleEnglish
Numero di pagine2
Stato di pubblicazionePublished - 2014

All Science Journal Classification (ASJC) codes

  • Medicine (miscellaneous)
  • Astronomy and Astrophysics
  • Nutrition and Dietetics
  • Public Health, Environmental and Occupational Health
  • Space and Planetary Science

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