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W2733922707 endingPage "169" @default.
W2733922707 startingPage "169" @default.
W2733922707 abstract "The FUV continuum spectrum of many accreting pre-main sequence stars, Classical T Tauri Stars (CTTSs), does not continue smoothly from the well-studied Balmer continuum emission in the NUV, suggesting that additional processes contribute to the short-wavelength emission in these objects. The most notable spectral feature in the FUV continuum of some CTTSs is a broad emission approximately centered at 1600~AA, which has been referred to as the 1600 A Bump. The origin of this feature remains unclear. We have assembled archival FUV spectra of 37 disk-hosting systems observed by the {it Hubble Space Telescope}. Clear 1600 A Bump emission is observed above the smooth, underlying 1100-1800 A continuum spectrum in 19/37 Classical T Tauri disks in the HST sample, with the detection rate in transition disks (8/8) being much higher than in primordial or non-transition sources (11/29). We describe a spectral deconvolution analysis to separate the Bump (spanning 1490~--~1690 A) from the underlying FUV continuum, finding an average Bump luminosity, $L$(Bump7 x 10^{29} erg s^{-1}. We find that the 1600 A Bump is characterized by a peak wavelength of 1598.6 +/- 3.3 A. Contrary to previous studies, we find that this feature is inconsistent with models of H2 excited by electron-impact. We show that this Bump emits roughly 10-80% of the total fluorescent H2 luminosity for stars with well-defined Bump features. Energetically, this suggests that the carrier of the 1600 A Bump emission is powered by Ly-a photons. We argue that the most likely mechanism is Ly-a-driven dissociation of H2O in the inner disk, r < 2 AU. We demonstrate that non-thermally populated H2O fragments can qualitatively account for the observed emission (discrete and continuum), and find that the average Ly-a-driven H2O dissociation rate is 1.7x 10^{42} water molecules s^{-1}." @default.
W2733922707 created "2017-07-14" @default.
W2733922707 creator A5024272189 @default.
W2733922707 creator A5032648987 @default.
W2733922707 creator A5046451348 @default.
W2733922707 date "2017-08-03" @default.
W2733922707 modified "2023-10-18" @default.
W2733922707 title "The 1600 Å Emission Bump in Protoplanetary Disks: A Spectral Signature of H<sub>2</sub>O Dissociation" @default.
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