Emission line diagnostics for accretion and outflows in young very low-mass stars and brown dwarfs

TL;DR

This paper analyzes accretion and outflow properties in very low-mass young stellar objects using spectral data to understand their evolutionary processes and compare them to T Tauri stars.

Contribution

It provides new diagnostics for accretion and outflows in brown dwarfs and very low-mass stars based on broad-band spectra, focusing on mass outflow to accretion ratios.

Findings

Determined mass outflow to accretion rates for substellar objects.

Identified variability in accretion and outflow processes.

Compared properties with classical T Tauri stars.

Abstract

We discuss accretion and outflow properties of three very low-mass young stellar objects based on broad-band mid-resolution X-Shooter/VLT spectra. Our targets (FU TauA, 2M 1207-39, and Par-Lup3-4) have spectral types between M5 and M8, ages between 1 Myr and ~10 Myr, and are known to be accreting from previous studies. The final objective of our project is the determination of mass outflow to accretion rate for objects near or within the substellar regime as a probe for the T Tauri phase of brown dwarfs and the investigation of variability in the accretion and outflow processes.