701 citations
- C. Ceccarelli3 profiles24 · h 55
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- Centre National de la Recherche ScientifiqueFR39 papers
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21 papers · 1 filter
Four quasars above redshift 6 discovered by the Canada-France High-z Quasar Survey
Chris J. Willott, Philippe Delorme, Alain Omont +15
The Canada-France High-z Quasar Survey (CFHQS) is an optical survey designed to locate quasars during the epoch of reionization. In this paper we present the discovery of the first…
Direct constraint on the distance of y2 Velorum from AMBER/VLTI observations
F. Millour, R. G. Petrov, O. Chesneau +95
In this work, we present the first AMBER observations, of the Wolf-Rayet and O (WR+O) star binary system y2 Velorum. The AMBER instrument was used with the telescopes UT2, UT3, and…
Testing grain surface chemistry : a survey of deuterated formaldehyde and methanol in low-mass Class 0 protostars
B. Parise, C. Ceccarelli, A. G. G. M. Tielens +4
Context : Despite the low cosmic abundance of deuterium (D/H ~ 1e-5), large degrees of deuterium fractionation in molecules are observed in star forming regions with enhancements t…
Improved low-temperature rate constants for rotational excitation of CO by H_2
M. Wernli, P. Valiron, A. Faure +3
Cross sections for the rotational (de)excitation of CO by ground state para- and ortho-H_2 are obtained using quantum scattering calculations for collision energies between 1 and 5…
A unified accretion-ejection paradigm for Black Hole X-ray Binaries
J. Ferreira, P. O. Petrucci, G. Henri +2
We present a new picture for the central regions of Black Hole X-ray Binaries. In our view, these central regions have a multi-flow configuration which consists in (1) an outer sta…
The HARPS search for southern extra-solar planets. VI. A Neptune-mass planet around the nearby M dwarf Gl 581
X. Bonfils, T. Forveille, X. Delfosse +7
We report the discovery of a Neptune-mass planet around Gl 581 (M3V, M = 0.31 Msol), based on precise Doppler measurements with the HARPS spectrograph at La Silla Observatory. The…