Agenda de Lagrange

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Septembre 2018

Séminaire Lagrange
Numerical models of neutron stars: connecting nuclear physics with astrophysics
 mardi 18 septembre 2018, 10h30, PHC - Mont Gros - talk in English - retransmis à Valrose (Salle O. Chesneau)
Jerome NOVAK - LUTH, Observatoire de Paris, France
Neutron stars are born in supernovae at the end of the life of massive stars. Their density can be greater than nuclear density near the center and the gravitational field possesses
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    strong relativistic effects. The building of realistic models for neutron stars thus requires the use of numerical simulations. In this talk, I shall briefly recall the general-relativistic framework for the description of rotating compact stars and show how global observable quantities can be computed. Elaborated models, taking into account more physical features as magnetic field, realistic equations of state or superfluidity shall then be detailed, together with their influence on observable parameters of the star. The most accurate numerical models then allow to relate observations to the underlying physical model, putting constraints to nuclear physics. Finally, I shall rapidly present implications of the gravitational wave observations from the binary neutron star event GW170817.
Tout public Lagrange
Le Square Kilometre Array: le plus grand radio télescope au monde pour étudier l'aube et l'évolution du cosmos
 mardi 25 septembre 2018, 10h30, NEF - Mont Gros - CION - talk in French with slides in English - retransmis à Valrose
Chiara FERRARI - OCA
Le Square Kilometre Array (SKA) est un radio télescope qui sera constitué par des centaines de milliers d'antennes, avec une surface collectrice totale, à terme, d'un kilomètre carré. Grâce à sa
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    taille et à sa couverture exceptionnelles du spectre électromagnétique, SKA nous permettra de façon unique de dévoiler l'aube du cosmos, d'étudier les champs magnétiques dans toutes les structures de l'Univers, de détecter des ondes gravitationnelles pas joignable par les autres instruments, de comprendre comment les galaxies de l'Univers ont évolué. Je vous parlerai de ce magnifique projet international, qui posera, entre autre, un des plus grands défis "Big Data" au niveau mondial.

Octobre 2018

Séminaire Lagrange
Radiative Hydrodynamics and Applications to Stellar Physics
 mardi 2 octobre 2018, 10h30, NEF - Mont Gros - CION - talk in english - retransmis à Valrose (Salle O. Chesneau)
Claire MICHAUT - LUTH, Observatoire de Paris, France
I would like to introduce myself in order to become a member of the Lagrange laboratory. I shall thus give a review of my activities in the field of the radiative
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    hydrodynamics, with aspects of analytical theory, numerical modelling and in addition experiments. The recent facilities of physics at high-energy-density as high-power lasers reach conditions of matter similar to astrophysical conditions. So, a new domain of research called high-energy-density laboratory astrophysics is born. It implies densities of energy up to 1011 J.m-3! The necessity of understanding the behavior of matter in extreme situations, such as stars produce them, requires sophisticated models. Indeed, the violent stellar mechanisms generating a material flow coupled with radiation requires radiative hydrodynamic models. These models should fit into those of stellar evolution, from the gravitational collapse to the end of star lives. I will show applications about young stellar jets, accretion columns in cataclysmic variables, radiative shocks, supernova remnants….
Séminaire Lagrange
Transient growth MRI compressible in a magnetized accretion disk
 mardi 9 octobre 2018, 10h30, NEF - Mont Gros - CION - talk in english - retransmis à Valrose (Salle O. Chesneau)
Thierry LEHNER - LUTH, Observatoire de Paris, France
After a pedagogical introduction to the relevant eigenmodes and to the phenomenon of transient growth, we shall interpret analytically and by a numerical analysis results of shearing box simulations from the
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    PLUTO code in the case of sheared and magnetized accretion disk. First we look at the involved linear eigenmodes including spiral density waves and magneto-sonic waves (which may exhibit a magneto-rotational instability MRI). We shall also compute the coupling of theses waves. Then we shall describe in transient growth phase the energy transfers (linear and no linear ) between the various energy components of the waves : kinetic, magnetic and compressional, looking for predicted/expected transverse energy cascades , typical for shear flows.
Tout public OCA
L’exploration de l’astéroïde Ryugu par Hayabusa2: premières surprises depuis son arrivée, déploiement de l’atterrisseur MASCOT et grands défis à venir!
 jeudi 11 octobre 2018, de 10h00 à 12h00, Salle de la NEF - CION - Mont-Gros
Patrick Michel - directeur de recherches au CNRS - Laboratoire Lagrange - Observatoire de la Côte d'Azur
Séminaire Lagrange
Transforming our understanding of the X-ray Universe: the Imaging X-ray Polarimetry Explorer (IXPE)
 mardi 16 octobre 2018, 10h30, NEF - Mont Gros - CION - talk in english - retransmis à Valrose
Frédéric MARIN - Observatoire Astronomique de Strasbourg, France

Novembre 2018

Conférence Lagrange
TBA
 mardi 6 novembre 2018, 10h30, NEF - Mont Gros - CION - talk in english - retransmis à Valrose (Salle O. Chesneau)
Laurenne JOUVE - IRAP, France
TBA.
Séminaire Lagrange
SPHERE visits the asteroid main belt
 mardi 20 novembre 2018, 10h30, NEF - Mont Gros - CION - talk in english - retransmis à Valrose (Salle O. Chesneau)
Pierre VERNAZZA - LAM, France
TBA.
Séminaire Lagrange
TBA
 mardi 27 novembre 2018, 10h30, NEF - Mont Gros - CION - talk in English - retransmis à Valrose (Salle O. Chesneau)
Georges KORDOPATIS & Mamadou N'DIAYE - Lagrange
TBA.

Décembre 2018

Conférence Lagrange
TBA
 mardi 4 décembre 2018, 10h30, NEF - Mont Gros - CION - talk in english - retransmis à Valrose (Salle O. Chesneau)
Jean-François CARDOSO - LTCI, Telecom ParisTech, France
TBA.
Séminaire Lagrange
TBD
 mardi 11 décembre 2018, 10h30, NEF - Mont Gros - CION - talk in English - retransmis à Valrose (Salle O. Chesneau)
Orlagh CREEVEY & Benoit CARRY - Lagrange
TBD.
      

Mise à jour : 18/09/18 17:03