The evolution of disk winds from a combined study of optical and infrared forbidden lines

Ilaria Pascucci, Andrea Banzatti, Uma Gorti, Min Fang, Klaus Pontoppidan, Richard Alexander, Giulia Ballabio, Suzan Edwards, Colette Salyk, Germano Sacco, Ettore Flaccomio, Geoffrey A. Blake, Andres Carmona, Cassandra Hall, Inga Kamp, Hans Ulrich Käufl, Gwendolyn Meeus, Michael Meyer, Tyler Pauly, Simon SteendamMichael Sterzik

Research output: Contribution to journalArticlepeer-review

Abstract

We analyze high-resolution (Δv≤10 km s-1) optical and infrared spectra covering the [O I] λ6300 and [Ne II] 12.81 μm lines from a sample of 31 disks in different evolutionary stages. Following work at optical wavelengths, we use Gaussian profiles to fit the [Ne II] lines and classify them into high-velocity component (HVC) or lowvelocity component (LVC) if the line centroid is more or less blueshifted than 30 km s-1 with respect to the stellar radial velocity, respectively. Unlike for the [O I], where an HVC is often accompanied by an LVC, all 17 sources with an [Ne II] detection have either an HVC or an LVC. [Ne II] HVCs are preferentially detected toward high accretors (Ṁacc > 10-8 Me⊙ yr-1), while LVCs are found in sources with low Ṁacc, low [O I] luminosity, and large infrared spectral index (n13-31). Interestingly, the [Ne II] and [O I] LVC luminosities display an opposite behavior with n13-31: as the inner dust disk depletes (higher n13-31), the [Ne II] luminosity increases while the [O I] weakens. The [Ne II] and [O I] HVC profiles are generally similar, with centroids and FWHMs showing the expected behavior from shocked gas in microjets. In contrast, the [Ne II] LVC profiles are typically more blueshifted and narrower than the [O I] profiles. The FWHM and centroid versus disk inclination suggest that the [Ne II] LVC predominantly traces unbound gas from a slow, wide-angle wind that has not lost completely the Keplerian signature from its launching region. We sketch an evolutionary scenario that could explain the combined [O I] and [Ne II] results and includes screening of hard (∼1 keV) X-rays in inner, mostly molecular, MHD winds.

Original languageEnglish (US)
Article number78
JournalAstrophysical Journal
Volume903
Issue number2
DOIs
StatePublished - Nov 10 2020

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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