The Gaia-ESO Public Spectroscopic Survey has begun and will obtain high quality spectroscopy of s... more The Gaia-ESO Public Spectroscopic Survey has begun and will obtain high quality spectroscopy of some 100000 Milky Way stars, in the field and in open clusters, down to magnitude 19, systematically ...
In an effort to simultaneously study the gas and dust components of the disc surrounding the youn... more In an effort to simultaneously study the gas and dust components of the disc surrounding the young Herbig Ae star HD 169142, we present far-IR observations obtained with the PACS instrument onboard the Herschel Space Observatory. This work is part of the open time key program GASPS, which is aimed at studying the evolution of protoplanetary discs. To constrain the gas properties in the outer disc, we observed the star at several key gas-lines, including [OI] 63.2 and 145.5 μm, [CII] 157.7 μm, CO 72.8 and 90.2 μm, and o-H2O 78.7 and 179.5 μm. We only detect the [OI] 63.2 μm line in our spectra, and derive upper limits for the other lines. We complement our data set with PACS photometry and 12/13CO data obtained with the Submillimeter Array. Furthermore, we derive accurate stellar parameters from optical spectra and UV to mm photometry. We model the dust continuum with the 3D radiative transfer code MCFOST and use this model as an input to analyse the gas lines with the thermo-chemica...
We propose for Chandra observations of X-ray emitting late B-type stars. Because they are (theore... more We propose for Chandra observations of X-ray emitting late B-type stars. Because they are (theoretically) not expected to emit X-rays, their X-ray detections have been attributed to unresolved late-type, magnetically active stars. The aim of this study is to resolve close binary ...
Symposium - International Astronomical Union, 2004
We report first results from our ground-based infrared imaging search for sub-stellar companions ... more We report first results from our ground-based infrared imaging search for sub-stellar companions (brown dwarfs and giant planets) of young (up to 100 Myrs) nearby (up to 100 pc) stars, where companions should be well separated from the central stars and still relatively bright due to ongoing accretion and/or contraction. Our observations are performed mainly with SOFI and SHARP at the ESO 3.5m NTT on La Silla (imaging) and with ISAAC at the ESO 8.2m Antu (VLT-UT1) on Cerro Paranal (imaging and spectroscopy), all in the H- and K-bands. Here, we present new companion candidates1 around three T Tauri stars (TWA-8 A, RXJ1121.1-3845, and RXJ1121.3-3447 N) in the TW Hya group, which would have been sub-stellar if at the same distance and age as the T Tauri stars, but are found to be background stars by spectroscopy.
Astronomische Gesellschaft Meeting Abstracts, 2000
We report first results from our ground-based infrared imaging search for sub-stellar companions ... more We report first results from our ground-based infrared imaging search for sub-stellar companions (brown dwarfs and giant planets) of young (up to 100 Myrs) nearby (up to 75 pc) stars, where companions should be well separated from the central stars and still relatively bright due to ongoing accretion and/or contraction. Among our targets are all members of the TW Hya,
We propose for Chandra observations of X-ray emitting late B-type stars. Because they are (theore... more We propose for Chandra observations of X-ray emitting late B-type stars. Because they are (theoretically) not expected to emit X-rays, their X-ray detections have been attributed to unresolved late-type, magnetically active stars. The aim of this study is to resolve close binary ...
The Gaia-ESO Public Spectroscopic Survey has begun and will obtain high quality spectroscopy of s... more The Gaia-ESO Public Spectroscopic Survey has begun and will obtain high quality spectroscopy of some 100000 Milky Way stars, in the field and in open clusters, down to magnitude 19, systematically ...
In an effort to simultaneously study the gas and dust components of the disc surrounding the youn... more In an effort to simultaneously study the gas and dust components of the disc surrounding the young Herbig Ae star HD 169142, we present far-IR observations obtained with the PACS instrument onboard the Herschel Space Observatory. This work is part of the open time key program GASPS, which is aimed at studying the evolution of protoplanetary discs. To constrain the gas properties in the outer disc, we observed the star at several key gas-lines, including [OI] 63.2 and 145.5 μm, [CII] 157.7 μm, CO 72.8 and 90.2 μm, and o-H2O 78.7 and 179.5 μm. We only detect the [OI] 63.2 μm line in our spectra, and derive upper limits for the other lines. We complement our data set with PACS photometry and 12/13CO data obtained with the Submillimeter Array. Furthermore, we derive accurate stellar parameters from optical spectra and UV to mm photometry. We model the dust continuum with the 3D radiative transfer code MCFOST and use this model as an input to analyse the gas lines with the thermo-chemica...
We propose for Chandra observations of X-ray emitting late B-type stars. Because they are (theore... more We propose for Chandra observations of X-ray emitting late B-type stars. Because they are (theoretically) not expected to emit X-rays, their X-ray detections have been attributed to unresolved late-type, magnetically active stars. The aim of this study is to resolve close binary ...
Symposium - International Astronomical Union, 2004
We report first results from our ground-based infrared imaging search for sub-stellar companions ... more We report first results from our ground-based infrared imaging search for sub-stellar companions (brown dwarfs and giant planets) of young (up to 100 Myrs) nearby (up to 100 pc) stars, where companions should be well separated from the central stars and still relatively bright due to ongoing accretion and/or contraction. Our observations are performed mainly with SOFI and SHARP at the ESO 3.5m NTT on La Silla (imaging) and with ISAAC at the ESO 8.2m Antu (VLT-UT1) on Cerro Paranal (imaging and spectroscopy), all in the H- and K-bands. Here, we present new companion candidates1 around three T Tauri stars (TWA-8 A, RXJ1121.1-3845, and RXJ1121.3-3447 N) in the TW Hya group, which would have been sub-stellar if at the same distance and age as the T Tauri stars, but are found to be background stars by spectroscopy.
Astronomische Gesellschaft Meeting Abstracts, 2000
We report first results from our ground-based infrared imaging search for sub-stellar companions ... more We report first results from our ground-based infrared imaging search for sub-stellar companions (brown dwarfs and giant planets) of young (up to 100 Myrs) nearby (up to 75 pc) stars, where companions should be well separated from the central stars and still relatively bright due to ongoing accretion and/or contraction. Among our targets are all members of the TW Hya,
We propose for Chandra observations of X-ray emitting late B-type stars. Because they are (theore... more We propose for Chandra observations of X-ray emitting late B-type stars. Because they are (theoretically) not expected to emit X-rays, their X-ray detections have been attributed to unresolved late-type, magnetically active stars. The aim of this study is to resolve close binary ...
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