E Hébrard

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  • E Hébrard, M Dobrijevic, J C Loison, A Bergeat, K M Hickson
  • 2012
Aims. Following the first detection of hydrogen isocyanide (HNC) in Titan's atmosphere, we have devised a new neutral chemical scheme for hydrogen cyanide (HCN) and HNC in the upper atmosphere of Titan. Methods. Our updated chemical scheme contains 137 compounds (with C, H, O and N elements) and 788 reactions (including 91 photolysis processes). To improve(More)
  • V Wakelam, E Herbst, J.-C Loison, I W M Smith, V Chandrasekaran, B Pavone +17 others
  • 2012
We present a novel chemical database for gas-phase astrochemistry. Named the KInetic Database for Astrochemistry (KIDA), this database consists of gas-phase reactions with rate coefficients and uncertainties that will be vetted to the greatest extent possible. Submissions of measured and calculated rate coefficients are welcome, and will be studied by(More)
  • P Petit, J.-F Donati, E Hard, J Morin, C P Folsom, T Bhm +18 others
  • 2016
The Open University's repository of research publications and other research outputs A maximum entropy approach to detect close-in giant planets around active stars Journal Article (2015). A maximum entropy approach to detect close-in giant planets around active stars. Astronomy & Astrophysics, 584 A84. For guidance on citations see FAQs. ABSTRACT Context.(More)
  • J.-F Donati, Yu, C Moutou, A C Cameron, L Malo, K Grankin +12 others
  • 2016
We report results of an extended spectropolarimetric and photometric monitoring of the weak-line T Tauri star V830 Tau and its recently-detected newborn close-in giant planet. Our observations , carried out within the MaTYSSE programme, were spread over 91 d, and involved the ESPaDOnS and Narval spectropolarimeters linked to the 3.6-m Canada-France-Hawaii,(More)
Hot Jupiters are giant Jupiter-like exoplanets that orbit their host stars 100 times more closely than Jupiter orbits the Sun. These planets presumably form in the outer part of the primordial disk from which both the central star and surrounding planets are born, then migrate inwards and yet avoid falling into their host star. It is, however, unclear(More)
Models of Titan ionospheric chemistry have shown that ion densities depend strongly on the neutral composition. The turbulent diffusion transport conditions , as modeled by eddy coefficients, can spectacularly affect the uncertainty on predicted neutral densities. In order to evaluate the error budget on ion densities predicted by photochemical models, we(More)
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