X-ray emission from the young brown dwarfs of the Taurus Molecular Cloud
Résumé
The X-ray Emission Survey of the Taurus Molecular Cloud (XEST) is an exceptionally large project to systematically investigate the high-energy properties of young stellar objects in this nearest star-forming region. It is accompanied by optical and near-infrared surveys of the same area. When XMM-Newton archival observations are added, the total X-ray exposure time is more than 200 hours shared among 25 pointings. In particular the surveyed areas, combined with two Chandra archival observations, allow us to study the X-ray emission of 19 young bona fide brown dwarfs (BDs) of the Taurus Molecular Cloud (TMC). We report here the properties of the X-ray emission of these young BDs. We detected half of this substellar sample in X-rays. Comparison with the properties of the X-ray emission from low-mass stars will allow us to investigate changes in the magnetic activity around the stellar/substellar boundary.