Reconstruction of Lyman Alpha Radiation in Classical T-Tauri Stars

Details Reconstruction of Lyman Alpha Radiation in Classical T-Tauri Stars Reconstruction of Lyman Alpha Radiation in Classical T-Tauri Stars

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934401s&link_type=abstract

American Astronomical Society, AAS Meeting #219, #344.01

Astronomy and Astrophysics

Astronomy

Scientific paper

Lyman alpha emission dominates the UV radiation field in the inner regions of protoplanetary disks, driving the heating and destruction of dust as well as gas chemistry. However, in most of these disks our knowledge of the Lyman alpha profiles is extremely limited due to circumstellar and interstellar extinction. We have used Lyman alpha-fluoresced H2 emission in HST-COS spectra to reconstruct the Lyman alpha profiles for a sample of 30 classical T-Tauri stars. The observed fluxes of 7 fluorescent progressions are compared with model Lyman alpha profiles to determine the incident radiation field. We compare these Lyman alpha profiles with those responsible for CO photo-excitation in these targets to constrain the spatial distribution of molecules in inner disk atmospheres.

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