منابع مشابه
Exploring Brown Dwarf Disks
We discuss the spectral energy distribution of three very low mass objects in Chamaeleon I for which ground-based spectroscopy and photometry as well as ISO measurements in the mid-infrared are available (Comerón et al. 2000; Persi et al. 2000). One of these stars (Cha Hα1) is a bona-fide brown dwarf, with mass 0.04–0.05 M⊙. We show that the observed emission is very well described by models of...
متن کاملExploring brown dwarf disks: A 1.3mm survey in Taurus
We have carried out sensitive 1.3mm observations of 20 young brown dwarfs in the Taurus star-forming region, representing the largest sample of young substellar objects targeted in a deep millimeter continuum survey to date. Under standard assumptions, the masses of brown dwarf disks range from .0.4 to several Jupiter masses. Their relative disk masses are comparable to those derived for coeval...
متن کاملBrown Dwarf Disks With
We present ALMA continuum and spectral line data at 0.89 mm and 3.2 mm for three disks surrounding young brown dwarfs and very low mass stars in the Taurus star forming region. Dust thermal emission is detected and spatially resolved for all the three disks, while CO(J = 3 − 2) emission is seen in two disks. We analyze the continuum visibilities and constrain the disks physical structure in dus...
متن کاملAccretion in ρ Ophiuchi brown dwarfs : infrared hydrogen line ratios ⋆
Context. Mass accretion rate determinations are fundamental for an understanding of the evolution of pre-main sequence star circumstellar disks. Aims. Magnetospheric accretion models are used to derive values of the mass accretion rates in objects of very different properties, from brown dwarfs to intermediate-mass stars; we test the validity of these models in the brown dwarf regime, where the...
متن کاملExploring Brown Dwarf
We discuss the spectral energy distribution of three very low mass objects in Chamaeleon I for which ground-based spectroscopy and photometry as well as ISO measurements in the mid-infrared are available (Comerr on et al. 2000; Persi et al. 2000). One of these stars (Cha H1) is a bona-de brown dwarf, with mass 0.04{0.05 M. We show that the observed emission is very well described by models of c...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2002
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20021065