[O I] 6300 Å emission in Herbig Ae/Be systems: Signature of Keplerian rotation

By B. Acke, M. V. D. Ancker, C. Dullemond. 2005

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We present high spectral-resolution optical spectra of 49 Herbig Ae/Be stars in a search for the [OI] 6300 A line. The vast majority of the stars in our sample show narrow (FWHM < 100 km s -1 ) emission lines, centered on the stellar radial velocity. In only three sources is the feature much broader (∼400 km s -1 ), and strongly blueshifted (-200 km s -1 ) compared to the stellar radial velocity. Some stars in our sample show double-peaked line profiles, with peak-to-peak separations of ∼10 km s -1 . The presence and strength of the [OI] line emission appears to be correlated with the far-infrared energy distribution of each source: stars with a strong excess at 60 μm have in general stronger [OI] emission than stars with weaker 60 μm excesses. We interpret these narrow [OI] 6300 A line profiles as arising in the surface layers of the protoplanetary disks surrounding Herbig Ae/Be stars. A simple model for [OI] 6300 A line emission due to the photodissociation of OH molecules shows that our results are in quantitative agreement with that expected from the emission of a flared disk if the fractional OH abundance is ∼5 × 10 -7 .

Subfields: Astronomy and Astrophysics, Spectroscopy

View Paper: https://www.semanticscholar.org/paper/acfc782b0c4814b0888627ede783293c90b316e1

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In Astronomy and Astrophysics

1. G. Herczeg
2. N. Calvet
3. L. Hartmann
4. N. Evans II
5. C. Salyk
6. K. Luhman
7. G. Blake
8. E. V. van Dishoeck

In Spectroscopy

1. G. Herczeg
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Citations in the corpus

• Accretion disks in luminous young stellar objects (2015, background): “There are fractionally more Herbig Be stars in group I (flared) than in group II (flat) (Acke et al., 2005).”
• Accretion onto Pre-Main-Sequence Stars (2016, background): “…Fairlamb et al. 2015), variability in accretion diagnostics (Mendigutia et al. 2013, Costigan et al. 2014), Keplerian disks that extend to near the corotation radius (Vink et al. 2002, Acke et al. 2005, Ilee et al. 2014), and accretion-driven jets (e.g., Grady et al. 2004, Ellerbroek et al. 2014).”
• Cold Disks: Spitzer Spectroscopy of Disks around Young Stars with Large Gaps (2007, unknown): “LkHa 330 (11–20 : Fernandez et al. 1995; Cohen & Kuhi 1979)Å and HD 135344 (17.4 : Acke et al. 2005) are clearly CTT stars.”
• H2O and OH Gas in the Terrestrial Planet-forming Zones of Protoplanetary Disks (2008, background): “It also acts as a coolant near the disk surface (e.g. Dullemond et al. 2007), and photolysis of OH to O(1D) has been invoked to explain the observed strengths of the 6300 Å O I line (Acke et al. 2005).”
• The molecular composition of the planet-forming regions of protoplanetary disks across the luminosity regime (2015, background): “Many of these sources also have strong OI emission at 6300 Å (see e.g., Acke et al. 2005).”
• C2D Spitzer-IRS spectra of disks around T Tauri stars. II. PAH emission features (2006, unknown): “…(1979), 6: Assumed distance to Oph cloud (de Geus et al. 1989), 7: Prato et al. (2003), 8: Acke & van den Ancker (2004), 9: Dunkin et al. (1997), 10: Acke et al. (2005), 11: Assumed distance to Taurus-Auriga cloud (Kenyon et al. 1994), 12: Hernández et al. (2004), 13: Mora et al. (2001), 14:…”