379 citations · 1.8k across the 35 of their papers we have counts for
7 papers · 1 filter
Detectability of dirty dust grains in brown dwarf atmospheres
CH. Helling, W. -F. Thi, P. Woitke +1
Dust clouds influence the atmospheric structure of brown dwarfs, and they affect the heat transfer and change the gas-phase chemistry. However, the physics of their formation and e…
Evidence for a hot dust-free inner disk around 51 Oph
W. -F. Thi, B. van Dalen, A. Bik +1
We report on the observation of CO bandhead emission around 51 Oph (dv=2). A high resolving power (R~10,000) spectrum was obtained with the infrared spectrometer ISAAC mounted on V…
Organic molecules in protoplanetary disks around TTauri and HerbigAe stars
Wing-Fai Thi, Gerd-Jan van Zadelhoff, Ewine F. van Dishoeck
The results of single-dish observations of low- and high-J transitions of selected molecules from protoplanetary disks around two TTauri stars (LkCa15 and TWHya) and two HerbigAe s…
Processed and unprocessed ices in circumstellar disks
K. Pontoppidan, E. Dartois, W. -F. Thi +1
We present 3-5 micron VLT-ISAAC spectroscopy searching for evidence of methanol ices in edge-on disks of young embedded stars. Examples include the disks of L1489 IRS in Taurus and…
A 3-5 micron VLT spectroscopic survey of embedded young low mass stars I: Structure of the CO ice
K. M. Pontoppidan, H. J. Fraser, E. Dartois +6
Medium resolution (lambda/Delta lambda = 5000-10000) VLT-ISAAC M-band spectra are presented of 39 young stellar objects in nearby low-mass star forming clouds showing the 4.67 micr…
Ices in Star-Forming Regions: First Results from VLT-ISAAC
E. F. van Dishoeck, E. Dartois, W. F. Thi +8
The first results from a VLT-ISAAC program on L- and M-band infrared spectroscopy of deeply-embedded young stellar objects are presented. The advent of 8-m class telescopes allows…
H2 and CO emission from disks around TTauri and HerbigAe pre-main-sequence stars and from debris disks around young stars: warm and cold circumstellar gas
W. F. Thi, E. F. van Dishoeck, G. A. Blake +8
We present ISO-SWS observations of H2 pure-rotational line emission from the disks around low and intermediate mass pre-main-sequence stars as well as from young stars thought to b…