GIARPS High-resolution Observations of T Tauri stars (GHOsT). IV. Accretion properties of the Taurus-Auriga young association

Abstract

In the framework of the GIARPS@TNG High-resolution Observations of T Tauri stars (GHOsT) project, we study the accretion properties of 37 Classical T Tauri Stars of the Taurus-Auriga star forming region (SFR) with the aim of characterizing their relation with the properties of the central star, of jets and disk winds, and of the global disk structure, in synergy with complementary ALMA millimiter observations. We derive stellar parameters, optical veiling, accretion luminosity (${\mathrm{L}}_{\mathrm{acc}}$) and mass accretion rate (${\dot{\mathrm{M}}}_{\mathrm{acc}}$) in a homogeneous and self-consistent way using high-resolution spectra acquired at the Telescopio Nazionale Galileo with the HARPS-N and GIANO spectrographs, and flux-calibrated based on contemporaneous low-resolution spectroscopic and photometric ancillary observations. The ${\mathrm{L}}_{\mathrm{acc}}$-${\mathrm{L}}_{\star }$, ${\dot{\mathrm{M}}}_{\mathrm{acc}}$-${\mathrm{M}}_{\star }$ and ${\dot{\mathrm{M}}}_{\mathrm{acc}}$-${\mathrm{M}}_{\mathrm{disk}}$ relationships of the Taurus sample are provided and compared with those of the coeval SFRs of Lupus and Chamaeleon I. Our results demonstrate the potential of contemporaneous optical and near-infrared high-resolution spectroscopy to simultaneously provide precise measurements of stellar and accretion/wind properties of young stars.

30 pages, 18 figures, 6 tables. Accepted for publication on Astronomy and Astrophysics

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