F
F. Allard
Researcher at École Normale Supérieure
Publications - 21
Citations - 3323
F. Allard is an academic researcher from École Normale Supérieure. The author has contributed to research in topics: Brown dwarf & Stellar classification. The author has an hindex of 13, co-authored 21 publications receiving 3191 citations. Previous affiliations of F. Allard include École normale supérieure de Lyon.
Papers
More filters
Journal ArticleDOI
Evolutionary models for cool brown dwarfs and extrasolar giant planets. The case of HD 209458
TL;DR: In this article, the authors present evolutionary models for cool brown dwarfs and extra-solar giant planets and show that irradiation effects can substantially affect the radius of sub-jovian mass giant planets.
Journal ArticleDOI
Evolutionary models for low-mass stars and brown dwarfs: uncertainties and limits at very young ages
TL;DR: In this paper, the authors analyse pre-main sequence evolutionary tracks for low mass stars with masses 1.4m and 1.5m and show that at low surface gravity, the common picture of vertical Hayashi lines is oversimplified.
Journal ArticleDOI
A new model for brown dwarf spectra including accurate unified line shape theory for the Na I and K I resonance line profiles
TL;DR: The first brown dwarf atmosphere models based on theoretical calculations of absorption profiles of sodium and potassium perturbed by helium and molecular hydrogen were presented in this article. But the results were limited to the T dwarf SDSS 1624.
Journal ArticleDOI
High-contrast imaging of Sirius A with VLT/SPHERE: looking for giant planets down to one astronomical unit
Arthur Vigan,Arthur Vigan,Cecile Gry,Graeme Salter,Dino Mesa,D. Homeier,D. Homeier,C. Moutou,C. Moutou,F. Allard +9 more
TL;DR: In this paper, the authors presented new coronagraphic observations obtained with VLT/SPHERE (Very Large Telescope/SpectroPolarimetric High-contrast Exoplanet REsearch) that explore, for the very first time, the innermost regions of the system down to 0.2 arcsec(0.5 au) from Sirius A.
Journal ArticleDOI
Fifteen new T dwarfs discovered in the UKIDSS Large Area Survey
D. J. Pinfield,Ben Burningham,Motohide Tamura,S. K. Leggett,N. Lodieu,Philip W. Lucas,Daniel J. Mortlock,Stephen J. Warren,Derek Homeier,Miki Ishii,Niall R. Deacon,Richard G. McMahon,Paul C. Hewett,M. R. Zapatero Osori,Eric Martin,Hugh R. A. Jones,Bram Venemans,Avril C. Day-Jones,Paul Dobbie,S. L. Folkes,Simon Dye,F. Allard,Isabelle Baraffe,D. Barrado y Navascués,Sarah L. Casewell,K. Chiu,Gilles Chabrier,F. Clarke,Simon Hodgkin,A. Magazzu,Mark J. McCaughrean,Tadashi Nakajima,Yakiv V. Pavlenko,C. G. Tinney +33 more
TL;DR: In this article, the authors presented the discovery of fifteen new T2.5-T7.5 dwarfs, with estimated distances between �24-93pc, identified in the first three main data releases of the UKIRT Infrared Deep Sky Survey.