Archives Séminaires 2012-2013

Séminaire

Séminaire IPAG de Gilles Chabrier (CRAL), jeudi 23 mai 2013 à 11h00, IPAG seminar room

I will present our current knowledge of the dtermination of the initial stellar and substellar mass function in the field and in young open clusters. I will then detail the main scenarii of stellar and brown dwarf formation that I will confront to current observational constraints.

Séminaire

Séminaire IPAG de Emmanuel Dartois (IAP), jeudi 30 mai 2013 à 11h00, IPAG seminar room

The interstellar medium is a physico-chemical laboratory where extremes conditions are encountered, and whose environmental parameters (e.g. density, reactant nature, radiations, temperature, time scales) define the composition of matter. Whereas cosmochemists can spectroscopically examine collected extraterrestrial material in the laboratory [e.g. 1,2,3,4,5,6], astrochemists must rely on remote observations to monitor and analyze the physico-chemical composition of interstellar solids [e.g. (…)

Séminaire

Séminaire IPAG de Fabien Baron (Georgia State University), jeudi 6 juin 2013 à 11h00, IPAG seminar room

The CHARA Array is the interferometer with the world’s highest angular resolution in the visible and near-infrared. The Michigan InfraRed Combiner (MIRC), the main imaging instrument of the array can combiner the light of all six CHARA telescopes to deliver detailed images of stars and their environments. To date, CHARA/MIRC has not only imaged the first main-sequence star beyond the Sun, but also the first interacting binaries, the mysterious Epsilon Aurigae, rapid rotators, supergiants, (…)

Séminaire exceptionnel

Séminaire IPAG de Guilaine Lagache (IAS), vendredi 28 juin 2013 à 11h00, IPAG seminar room

All we need is six numbers to describe the Universe ! Planck data are extremely consistent with the predictions of the base Lambda-CDM cosmology. Remarkably, from an analysis of an extensive grid of models, we find no strong evidence to favor any extension to the base Lambda-CDM cosmology, either from the CMB temperature power spectrum alone, or in combination with the Planck lensing power spectrum and other astrophysical data sets.
This model sets the framework for the formation and (…)

Séminaire

Séminaire IPAG de Cathy Quantin-Nataf (Univ. Lyon 1), jeudi 20 juin 2013 à 11h00, IPAG seminar room

Since 1996, four orbiters have reached the red planet with multiple remote sensing captors. Three are still acquiring data with spatial resolution down to 25 cm per pixel. Gathering this large diversity of data, we assess the topography, the morphology and the mineralogy of the surface of Mars from global scale to locale scale. The combination of these data allows geological investigations and reconstitutions of the climatic and geological evolution of Mars. I will present achieved and (…)

Séminaire

Séminaire IPAG de Daniel Apai (Univ. of Arizona), jeudi 11 juillet 2013 à 11h00, IPAG seminar room

Astronomy has entered an exciting new era when the atmospheres of exoplanets can be studied in detail. Observations of directly imaged exoplanets and brown dwarfs revealed the presence of condensate clouds that strongly influence the energy transport through the planetary atmospheres and, therefore, influence the evolution of the atmospheres and the emerging spectra.The physical nature and properties of these cloud layers remain mostly unknown, but pose one of the outstanding challenges in (…)