CTTS FUV
High-Resolution Far-UV
Radiation Fields of
Classical T Tauri Stars

Contact: Kevin France

kevin.france "at" colorado.edu

The far-ultraviolet (FUV; 912-1700~Ang) radiation field from accreting central stars in Classical T Tauri systems influences the disk chemistry during the period of giant planet formation. The FUV field may also play a critical role in determining the evolution of the inner disk (r < 10 AU), from a gas- and dust-rich primordial disk to a transitional system where the optically thick warm dust distribution has been depleted. The total and component level high-resolution radiation fields FUV radiation fields of 16 T Tauri stars whose dust disks display a range of evolutionary states are made publicly available in machine-readable format on this site. We include reconstructed Ly-alpha line profiles and remove atomic and molecular disk emission (from H2 and CO fluorescence) to provide robust measurements of both the FUV continuum and hot gas lines (e.g., Ly-alpha, NV, CIV, HeII).

Spectral Energy Distributions: We find that the flux of the typical Classical T Tauri Star FUV radiation field at 1 AU from the central star is ~ 10^{7} times the average interstellar radiation field. The Ly-alpha emission line contributes an average of 88% of the total FUV flux, with the FUV continuum accounting for an average of 8%. On average, only ~0.5 % of the total FUV flux is emitted between the Lyman limit (912~Ang) and the H2 (0-0) absorption band at 1110 Ang.


NEW! FUV - optical spectra of RY Lup, MY Lup, Sz 68, and TYC 7851 (912 - 5700 Ang), presented in Arulanantham et al. (2018, ApJ; 2020). This README file describes the preparation of this panchromatic SED.
  • RY Lup (All Data: Wavelength, Observed Flux, Reddening Corrected Flux, FUV Continuum Flux Only )
  • RY Lup (All Data Plot)
  • MY Lup (All Data: Wavelength, Observed Flux, Reddening Corrected Flux, FUV Continuum Flux Only )
  • Sz 68 (All Data: Wavelength, Observed Flux, Reddening Corrected Flux, FUV Continuum Flux Only )
  • TYC 7851 (All Data: Wavelength, Observed Flux, Reddening Corrected Flux, FUV Continuum Flux Only )

    • This second grid of spectra are the FUV-only spectra described in France et al. (2014). Acknowledgement: If you download and use the CTTS FUV spectra for scientific analysis, we request that you cite France et al. 2014 and include something similar to the following brief ackowledgement: "This work has made use of the CTTS FUV high-resolution ultraviolet radiation field database."
  • AA Tau (All)
  • AA Tau (LyA)
  • AA Tau (Continuum)
  • BP Tau (All)
  • BP Tau (LyA)
  • BP Tau (Continuum)
  • DE Tau (All)
  • DE Tau (LyA)
  • DE Tau (Continuum)
  • DF Tau (All)
  • DF Tau (LyA)
  • DF Tau (Continuum)
  • DM Tau (All)
  • DM Tau (LyA)
  • DM Tau (Continuum)
  • DR Tau (All)
  • DR Tau (LyA)
  • DR Tau (Continuum)
  • GM Aur (All)
  • GM Aur (LyA)
  • GM Aur (Continuum)
  • HN Tau (All)
  • HN Tau (LyA)
  • HN Tau (Continuum)
  • LkCa15 (All)
  • LkCa15 (LyA)
  • LkCa15 (Continuum)
  • RECX-11 (All)
  • RECX-11 (LyA)
  • RECX-11 (Continuum)
  • RECX-15 (All)
  • RECX-15 (LyA)
  • RECX-15 (Continuum)
  • RU Lupi (All)
  • RU Lupi (LyA)
  • RU Lupi (Continuum)
  • SU Aur (All)
  • SU Aur (LyA)
  • SU Aur (Continuum)
  • TW Hya (All)
  • TW Hya (LyA)
  • TW Hya (Continuum)
  • UX Tau (All)
  • UX Tau (LyA)
  • UX Tau (Continuum)
  • V4046 Sgr (All)
  • V4046 Sgr (LyA)
  • V4046 Sgr (Continuum)

    • The CTTS FUV website is hosted by the Center for Astrophysics and Space Astronomy, University of Colorado. The disk image above was taken from an ESO press release.