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59 papers · 1 filter
Detection of lithium in nearby young late-M dwarfs
N. Phan-Bao, M. S. Bessell, D. Nguyen-Thanh +4
Late M-type dwarfs in the solar neighborhood include a mixture of very low-mass stars and brown dwarfs which is difficult to disentangle due to the lack of constraints on their age…
Discovery of wide low and very low-mass binary systems using Virtual Observatory tools
M. C. Galvez-Ortiz, E. Solano, N. Lodieu +1
The frequency of multiple systems and their properties are key constraints of stellar formation and evolution. Formation mechanisms of very low-mass (VLM) objects are still under c…
Optical and near-infrared linear polarization of low and intermediate-gravity ultra-cool dwarfs
P. A. Miles-Páez, M. R. Zapatero Osorio, E. Pallé +1
We aim to study the optical and near-infrared linear polarimetric properties of a sample of young M7-L7 dwarfs (1-500 Myr) with spectroscopic signatures of low- and interm…
ALMA Observations of the Water Fountain Pre-Planetary Nebula IRAS 16342-3814: High-velocity bipolar jets and an Expanding Torus
R. Sahai, W. H. T. Vlemmings, T. Gledhill +4
We have mapped 12CO J=3-2 and other molecular lines from the "water-fountain" bipolar pre-planetary nebula (PPN) IRAS 16342-3814 with ~0."35 resolution using ALMA. We find (i) two…
A second post-AGB nebula that contains gas in rotation and in expansion: ALMA maps of IW Car
V. Bujarrabal, A. Castro-Carrizo, H. Van Winckel +2
We aim to study the presence of both rotation and expansion in post-AGB nebulae, in particular around IW Car, a binary post-AGB star that was suspected to be surrounded by a Kepler…
Effects of spatial and temporal noise on a cubic-autocatalytic reaction-diffusion model
Jean-Sebastien Gagnon, David Hochberg, Juan Perez-Mercader
We characterize the influence that external noise, with both spatial and temporal correlations, has on the scale dependence of the reaction parameters of a cubic autocatalytic reac…