Showing papers by "Jacques Crovisier published in 2003"
Centre national de la recherche scientifique1, University of Waterloo2, Janssen Pharmaceutica3, École Normale Supérieure4, Herzberg Institute of Astrophysics5, Swedish Space Corporation6, McMaster University7, University of Helsinki8, University of Calgary9, Helsinki University of Technology10, Saint Mary's University11, Swedish National Space Board12, Hoffmann-La Roche13
TL;DR: For the first time, a search has been conducted in our Galaxy for the 119 GHz transition connecting to the ground state of O2, using the Odin satellite as mentioned in this paper, equipped with a sensitive 3 mm receiver (Tsy...
Abstract: For the first time, a search has been conducted in our Galaxy for the 119 GHz transition connecting to the ground state of O2, using the Odin satellite. Equipped with a sensitive 3 mm receiver (Tsy ...
112 citations
TL;DR: The Odin satellite as discussed by the authors was used to observe the 1 1 1 0 -1 0-1 0 1 rotational line at 557 GHz of ortho water with a high spectral resolution (80 m s - 1 ) and a spatial resolution of 2.1', which is well suited for cometary studies.
Abstract: The Odin satellite, which can observe the 1 1 0 -1 0 1 rotational line at 557 GHz of ortho water with a high spectral resolution (80 m s - 1 ) and a spatial resolution of 2.1', is well suited for cometary studies. The intensity of this line provides an estimate of the water production rate. The line width gives a direct measure of the coma expansion velocity. The line centre position and shape are affected by the anisotropy of the outgassing and by optical depth effects. Comets observed with Odin up to now are C/2001 A2 (LINEAR) during the commissioning phase of the satellite, 19P/Borrelly at the time of the Deep Space 1 flyby, C/2000 WM 1 (LINEAR), and 153P/2002 Cl (Ikeya-Zhang). For this last comet, thorough observations were made at the moment of its closest approach to Earth at the end of April 2002. A deep integration resulted in the detection of the 1 1 0 -1 0 1 line of H 2 1 8 O at 548 GHz. No 1 6 O/ 1 8 O isotopic anomaly is found.
67 citations
TL;DR: In this article, a parent Haser scale length for heliocentric distances beyond 3 AU has been derived based on the relative column density profiles of the radicals of C/1995 O1 (Hale-Bopp).
Abstract: We observed comet C/1995 O1 (Hale-Bopp) at 4.6-2.9 AU pre-perihelion and 2.8-12.8 AU post-perihelion with optical long-slit spectroscopy. Emission bands of CN, C 3 , C 2 and NH 2 have been covered. Emission of C 3 was detected up to 7.0 AU, and CN could be followed up to 9.8 AU post-perihelion. Spatial column density profiles of the radicals have been used to derive effective parent Haser scale lengths for heliocentric distances beyond 3 AU. Production rates were derived based on these Haser scale lengths. The observations of CN are in agreement with HCN as the major parent molecule of this radical at large distances from the Sun (i.e. beyond ∼3 AU). We compare the measured CN production rate to sublimation rates of HCN from a simple nucleus sublimation model. The variation of CN production rates with changing heliocentric distance gives no indication for sublimation from the interior and is consistent with very little thermal lag of the nucleus.
60 citations
Swedish Space Corporation1, University of Waterloo2, European Space Research and Technology Centre3, Janssen Pharmaceutica4, Centre national de la recherche scientifique5, École Normale Supérieure6, Herzberg Institute of Astrophysics7, McMaster University8, University of Helsinki9, University of Calgary10, Finnish Meteorological Institute11, Helsinki University of Technology12, University of Saskatchewan13, University of Paris14, Saint Mary's University15, Chalmers University of Technology16, Swedish National Space Board17, Hoffmann-La Roche18, Canadian Space Agency19, Stockholm University20
TL;DR: The Swedish National Space Board (SNSB) and the Swedish Space Corporation (SSC) have been the prime industrial contractor, and also responsible for the satellite operation from its Odin mission control centre at SSC in Solna and its Odin Control Centre at ESRANGE near Kiruna in northern Sweden as discussed by the authors.
Abstract: Key Odin operational and instrumental features and highlights from our sub-millimetre and millimetre wave observations of H2O, H218O, NH3, 15NH3 and O2 are presented, with some insights into accompanying Odin Letters in this AA H2O observations of Galactic Centre sources, of shock enhanced H2O towards the SNR IC443, and of the candidate infall source IRAS 16293-2422; H218O detections in Orion KL and in comet Ikeya-Zhang; sub-mm detections of NH3 in Orion KL (outflow, ambient cloud and bar) and ρ Oph, and very recently, of 15NH3 in~Orion KL. Simultaneous sensitive searches for the 119 GHz line of O2 have resulted in very low abundance limits, which are difficult to accomodate in chemical models. We also demonstrate, by means of a quantitative comparison of Orion KL H2O results, that the Odin and SWAS observational data sets are very consistently calibrated. Odin is a Swedish-led satellite project funded jointly by the Swedish National Space Board (SNSB), the Canadian Space Agency (CSA), the National Technology Agency of Finland (Tekes), and the Centre National d'etudes Spatiales (CNES, France). The Swedish Space Corporation (SSC) has been the prime industrial contractor, and is also responsible for the satellite operation from its Odin Mission Control Centre at SSC in Solna and its Odin Control Centre at ESRANGE near Kiruna in northern Sweden. See also the SNSB Odin web page: http://www.snsb.se/eng_odin_intro.shtml
43 citations