PENELLOPE\,VI. -- Searching the PENELLOPE/UVES sample with spectro-astrometry: Two new microjets of Sz 103 and XX Cha

TL;DR

This study used spectro-astrometry with UVES to identify two new microjets in T Tauri stars Sz 103 and XX Cha, advancing understanding of outflow activity in young stellar objects.

Contribution

It is the first to detect microjets in Sz 103 and XX Cha using spectro-astrometry, and confirms binary status of several T Tauri stars, providing new insights into their outflows and binarity.

Findings

Discovered microjets in Sz 103 and XX Cha with <10 au extent.

Confirmed binary nature of VW Cha and CVSO 109.

Identified spectroscopic binaries DK Tau B and CVSO 104 A.

Abstract

The main goal of this study is to screen the PENELLOPE/UVES targets for outflow activity and find microjets via spectro-astrometry in, e.g., the [OI]$\lambda$6300 line. In total, 34 T\,Tauri stars of the PENELLOPE survey have been observed with the high resolution slit spectrograph UVES in three different slit positions rotated by $120^\text{o}$. Our spectro-astrometric analysis in the [OI]$\lambda$6300 wind line reveals two newly discovered microjets associated with Sz\,103 and XX\,Cha. Both microjets have an extent of about $0.04$ arcseconds, that is, $<10\,\text{au}$, and we confined their orientation by the three slit observations. Furthermore, we confirm the binary nature of VW\,Cha and CVSO\,109. We present (further) evidence that DK\,Tau\,B and CVSO\,104\,A are spectroscopic binaries. Sz\,115 is tentatively a spectroscopic binary. The origin of the LVC, that is, MHD winds versus photoevaporative winds, of the Sz\,103 and XX\,Cha microjets remains unclear.