TRACING SLOW WINDS from T TAURI STARS VIA LOW-VELOCITY FORBIDDEN LINE EMISSION

M. N. Simon, Ilaria Pascucci, S. Edwards, W. Feng, U. Gorti, D. Hollenbach, E. Rigliaco, J. T. Keane

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Using Keck/HIRES spectra (Δ v ∼ 7 km s-1) we analyze forbidden lines of [O i] 6300 Å, [O i] 5577 Å and [S ii] 6731 Å from 33 T Tauri stars covering a range of disk evolutionary stages. After removing a high-velocity component (HVC) associated with microjets, we study the properties of the low-velocity component (LVC). The LVC can be attributed to slow disk winds that could be magnetically (magnetohydrodynamic) or thermally (photoevaporative) driven. Both of these winds play an important role in the evolution and dispersal of protoplanetary material. LVC emission is seen in all 30 stars with detected [O i] but only in two out of eight with detected [S ii], so our analysis is largely based on the properties of the [O i] LVC. The LVC itself is resolved into broad (BC) and narrow (NC) kinematic components. Both components are found over a wide range of accretion rates and their luminosity is correlated with the accretion luminosity, but the NC is proportionately stronger than the BC in transition disks. The full width at half maximum of both the BC and NC correlates with disk inclination, consistent with Keplerian broadening from radii of 0.05 to 0.5 au and 0.5 to 5 au, respectively. The velocity centroids of the BC suggest formation in an MHD disk wind, with the largest blueshifts found in sources with closer to face-on orientations. The velocity centroids of the NC, however, show no dependence on disk inclination. The origin of this component is less clear and the evidence for photoevaporation is not conclusive.

Original languageEnglish (US)
Article number169
JournalAstrophysical Journal
Volume831
Issue number2
DOIs
StatePublished - Nov 10 2016

Fingerprint

T Tauri stars
low speed
centroids
inclination
accretion
luminosity
magnetohydrodynamics
kinematics
coverings
stars
radii

Keywords

  • Accretion
  • Accretion disks
  • Protoplanetary disks
  • Stars: pre-main sequence

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Simon, M. N., Pascucci, I., Edwards, S., Feng, W., Gorti, U., Hollenbach, D., ... Keane, J. T. (2016). TRACING SLOW WINDS from T TAURI STARS VIA LOW-VELOCITY FORBIDDEN LINE EMISSION. Astrophysical Journal, 831(2), [169]. https://doi.org/10.3847/0004-637X/831/2/169

TRACING SLOW WINDS from T TAURI STARS VIA LOW-VELOCITY FORBIDDEN LINE EMISSION. / Simon, M. N.; Pascucci, Ilaria; Edwards, S.; Feng, W.; Gorti, U.; Hollenbach, D.; Rigliaco, E.; Keane, J. T.

In: Astrophysical Journal, Vol. 831, No. 2, 169, 10.11.2016.

Research output: Contribution to journalArticle

Simon, MN, Pascucci, I, Edwards, S, Feng, W, Gorti, U, Hollenbach, D, Rigliaco, E & Keane, JT 2016, 'TRACING SLOW WINDS from T TAURI STARS VIA LOW-VELOCITY FORBIDDEN LINE EMISSION', Astrophysical Journal, vol. 831, no. 2, 169. https://doi.org/10.3847/0004-637X/831/2/169
Simon, M. N. ; Pascucci, Ilaria ; Edwards, S. ; Feng, W. ; Gorti, U. ; Hollenbach, D. ; Rigliaco, E. ; Keane, J. T. / TRACING SLOW WINDS from T TAURI STARS VIA LOW-VELOCITY FORBIDDEN LINE EMISSION. In: Astrophysical Journal. 2016 ; Vol. 831, No. 2.
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