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17 new very low-mass members in Taurus. The brown dwarf deficit revisited | | S. Guieu
; C Dougados
; J.L Monin
; E Magnier
; E.L Martin
; | | Date: |
13 Sep 2005 | | Subject: | astro-ph | | Affiliation: | 1 and 2), E Magnier (3 and 4), E.L Martin (5 and 6) ( Laboratoire d’Astrophysique de Grenoble, Institut Universitaire de France, Canada-France-Hawaii Telescope Corporation, University of Hawaii, Institute of Astronomy, Instituto de Astrofisi | | Abstract: | Recent studies of the substellar population in the Taurus cloud have revealed a deficit of brown dwarfs (BD) compared to the Trapezium cluster population (Briceno et al 1998; Luhman 2000; Luhman et al 2003a; Luhman 2004). However, these works have concentrated on the highest stellar density regions of the Taurus cloud. We have performed a large scale optical survey of this region, covering a total area of 30 deg^2, and encompassing the densest part of the cloud as well as their surroundings, down to a mass detection limits of 15 Jupiter Masses (MJ). In this paper, we present the optical spectroscopic follow-up observations of 97 photometrically selected potential new low-mass Taurus members, of which 27 are strong late-M (SpT < M4V) candidates. These observations reveal 5 new very low mass (VLM) Taurus members and 12 new BDs. Combining our observations with previously published results, we derive an updated substellar to stellar ratio in Taurus of Rss =0.23 +/- 0.05. This ratio now appears consistent with the value previously derived in the Trapezium cluster under similar assumptions of 0.26 +/- 0.04. We find strong indication that the relative numbers of BDs with respect to stars is decreased by a factor 2 in the central regions of the aggregates with respect to the more distributed population. Our findings are best explained in the context of the embryo-ejection model where brown dwarfs originate from dynamical interactions in small N unstable multiple systems. | | Source: | arXiv, astro-ph/0509317 | | Services: | Forum | Review | PDF | Favorites | |
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