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Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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35 papers · 1 filter
The infrared L'-band view of the Galactic Center with NAOS-CONICA at VLT
Y. Clénet, D. Rouan, E. Gendron +9
We report on Galactic Center L'-band observations made during NAOS/CONICA Science Verification. Colors of the inner 2" stars reveal an infrared excess of S2, the closest star to th…
Hot Very Small dust Grains in NGC 1068 seen in jet induced structures thanks to VLT/NACO adaptive optics
Daniel Rouan, Francois Lacombe, Eric Gendron +12
We present K, L and M diffraction-limited images of NGC 1068 obtained with NAOS+CONICA at VLT/YEPUN over a 3.5" field around the central engine. Hot dust (Tcol = 550-650 K) is foun…
VLT/NACO infrared adaptive optics images of small scale structures in OMC1
Francois Lacombe, Eric Gendron, Daniel Rouan +10
Near-infrared observations of line emission from excited H2 and in the continuum are reported in the direction of the Orion molecular cloud OMC1, using the European Southern Observ…
The GraF instrument for imaging spectroscopy with the adaptive optics
A. Chalabaev, E. le Coarer, P. Rabou +3
The GraF instrument using a Fabry-Perot interferometer cross-dispersed with a grating was one of the first integral-field and long-slit spectrographs built for and used with an ada…
The H2CO abundance in the inner warm regions of low mass protostellar envelopes
Sebastien Maret, Cecilia Ceccarelli, Emmanuel Caux +9
We present a survey of the formaldehyde emission in a sample of eight Class 0 protostars obtained with the IRAM and JCMT telescopes. The data have been analyzed with three differen…
First detection of triply-deuterated methanol
B. Parise, A. Castets, E. Herbst +4
We report the first detection of triply-deuterated methanol, with 12 observed transitions, towards the low-mass protostar IRAS 16293-2422, as well as multifrequency observations of…
Spectroscopic identification of DENIS-selected brown dwarf candidates in the Upper Scorpius OB association
Eduardo L. Martin, Xavier Delfosse, Sylvain Guieu
We present low-resolution (R=900) optical (576.1--1,051.1 nm) spectroscopic observations of 40 candidate very low-mass members in the Upper Scorpius OB association. These objects w…
Near-IR [Fe II] emission diagnostics applied to cold disk winds in young stars
N. Pesenti, C. Dougados, S. Cabrit +3
We investigate the emissivity properties of the main near-IR transitions of the Fe+ ion in the conditions prevailing in the inner regions of jets from young stars, based on a simpl…
Direct measurement of the size and shape of the present-day stellar wind of Eta Carinae
R. van Boekel, P. Kervella, M. Schoeller +7
We present new high angular resolution observations at near-IR wavelengths of the core of the Luminous Blue Variable Eta Carinae, using NAOS-CONICA at the VLT and VINCI at the VLT…
Sulphur-bearing species in the star forming region L1689N
V. Wakelam, A. Castets, C. Ceccarelli +3
We report observations of the expected main S-bearing species (SO, SO2 and H2S) in the low-mass star forming region L1689N. We obtained large scale (~300''x200'') maps of several t…
The ELODIE survey for northern extra-solar planets III. Three planetary candidates detected with ELODIE
D. Naef, M. Mayor, J. L. Beuzit +4
We present our ELODIE radial-velocity measurements of HD 74156 and 14 Her (HD 145675). These stars exhibit low-amplitude radial-velocity variations induced by the presence of low-m…
Physical interpretation of the UV/X-ray variability behavior of NGC 7469
P. O. Petrucci, L. Maraschi, F. Haardt +1
We present a re-analysis of the simultaneous 30 day IUE/XTE observation of NGC 7469 done in 1996. Our main progress, in comparison to previous spectral analysis, is to adopt and fi…
On the origin of brown dwarfs and free-floating planetary mass objects
Pavel Kroupa, Jerome Bouvier
(abridged) Sub-stellar mass objects have fundamentally different binary properties than stars implying that they cannot have the same formation history. They are rather unfinished…
SIMBOL-X : a new generation hard X-ray telescope
P. Ferrando, M. Arnaud, B. Cordier +17
SIMBOL-X is a hard X-ray mission, operating in the 0.5-70 keV range, which is proposed by a consortium of European laboratories for a launch around 2010. Relying on two spacecraft…
Near-IR coronagraphic imaging of the companion to HR 7672
A. Boccaletti, G. Chauvin, A. -M. Lagrange +1
This article presents coronagraphic images of the low-mass companion to the star HR 7672 observed at the Palomar 200 inch telescope and first detected at Gemini and Keck in the K b…
The ELODIE survey for northern extra--solar planets I. 6 new extra--solar planet candidates
C. Perrier, J. P. Sivan, D. Naef +4
Precise radial-velocity observations at Haute-Provence Observatory (OHP, France) with the ELODIE echelle spectrograph have been undertaken since 1994. In addition to several discov…
On the universal outcome of star-formation: Is there a link between stars and brown-dwarfs?
P. Kroupa, J. Bouvier, G. Duchene +1
(abridged) The recent evidence obtained by Briceno et al. that star-formation in Taurus-Auriga (TA) may be producing significantly fewer brown dwarfs (BDs) per star than the ONC is…
First detection of doubly deuterated hydrogen sulfide
C. Vastel, T. G. Phillips, C. Ceccarelli +1
This work was carried out with using the Caltech Submillimeter Observatory and presents the observational study of HDS and D2S towards a sample of Class 0 sources, and dense cores.…
Dust Production from collisions in extrasolar planetary systems The inner Beta-Pictoris disc
Philippe Thebault, Jean-Charles Augereau, Herve Beust
Dust particles observed in extrasolar planetary discs originate from undetectable km-sized bodies but this valuable information remains uninteresting if the theoretical link betwee…
Proper motions and velocity asymmetries in the RW Aur jet
L. Lopez-MArtin, S. Cabrit, C. Dougados
We present adaptive optics spectro-imaging observations of the RW Aur jet in optical forbidden lines, at an angular resolution of 0.4 arcsec. Comparison with HST data taken 2 years…
XMM-Newton observation of the brightest X-ray flare detected so far from SgrA*
D. Porquet, P. Predehl, B. Aschenbach +5
We report the high S/N observation on October 3, 2002 with XMM-Newton of the brightest X-ray flare detected so far from SgrA* with a duration shorter than one hour (~ 2.7 ks). The…
The ELODIE survey for northern extra-solar planets II. A Jovian planet on a long-period orbit around GJ 777 A
D. Naef, M. Mayor, S. G. Korzennik +8
We present radial-velocity measurements obtained with the ELODIE and AFOE spectrographs for GJ 777 A (HD 190360), a metal-rich ([Fe/H]=0.25) nearby (d=15.9 pc) star in a stellar bi…
Constraints on the disk geometry of the T Tauri star AA Tau from linear polarimetry
F. Menard, J. Bouvier, C. Dougados +2
We have simultaneously monitored the photometric and polarimetric variations of the Classical T Tauri star AA Tau during the fall of 2002. We combine these data with previously pub…
Eclipses by circumstellar material in the T Tauri star AA Tau. II. Evidence for non-stationary magnetospheric accretion
J. Bouvier, K. N. Grankin, S. H. P. Alencar +12
We report the results of a synoptic study of the photometric and spectroscopic variability of the classical T Tauri star AA Tau on timescales ranging from a few hours to several we…