Laboratoire d’Études du Rayonnement et de la Matière en Astrophysique et Atmosphères

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LERMA (Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres) is a research entity operated by CNRS and three higher education institutions: Observatoire de Paris (OP),Sorbonne Université (SU), École normale supérieure (ENS), and Université de Cergy-Pontoise (UCP). These institutions host the various LERMA research groups.

The laboratory is organized in four Research Poles:

  • "Galaxies and Cosmology": studies of the early universe, inflation, cosmic microwave background; epoch of reionization; galaxy clusters; dynamics of galaxies, dark matter; galaxy formation and evolution; black holes, AGN, star formation and feedback in local and high-redshift galaxies.
  • "Dynamics of the Interstellar Medium and Stellar Plasmas": observational characterization of the ISM cycle; star and planet formation; ISM modeling, from diffuse gas to stars and disks, chemical diagnostics of the ISM dynamics; modeling the transport mechanisms in circumstellar plasmas; laboratory plasma experiments.
  • "Molecules in the Universe": studies of gas-phase collisional and reactive processes; VUV spectroscopy and photophysics, exobiology; gas-solid interactions and heterogeneous catalysis, laboratory astrophysics.
  • "Instrumentation and Remote Sensing": development of THz heterodyne instrumentation for large instrumental projects, Herschel/HIFI and JUICE/SWI; research and development activities: HEB and SIS mixers, Schottky diodes for applications in tunable local oscillators; Earth and planetary remote sensing, instrument software development.

These research poles are complemented by a transverse structure, dedicated to:
Technology and Research Support

Séminaires à venir

Vendredi 28 février 2020, 14h00
Salle de l'atelier, Paris
Filament Paradigm and Galactic Star Formation
Shu-ichiro INUTSUKA
Nagoya University
résumé :
Recent observations have emphasized the importance of the formation and evolution of magnetized filamentary molecular clouds in the process of star formation. Theoretical and observational investigations have provided convincing evidence for the formation of molecular cloud cores by the gravitational fragmentation of filamentary molecular clouds. Thus, the mass function and rotations of molecular cloud cores should be directly related to the properties of the filamentary molecular cloud, which determines the initial size and mass distribution of a protoplanetary disk around a protostar created in a core. In this talk I explain our current understanding of the star formation processes in the Galactic disk, and summarize various processes that are required in describing the filamentary molecular clouds to understand the star formation rate/efficiency, the stellar
initial mass function, and the angular momentum distribution of protoplanetary disks in their early evolutionary phase.
Vendredi 20 mars 2020, 14h00
Salle de l'atelier, Paris
The challenges of observing the Epoch of Reionization and Cosmic Dawn
Kateyn institute
résumé :
Low-frequency observations of the redshifted 21cm line promise to open a new window onto the first billion years of cosmic history, allowing us to directly study the astrophysical processes occurring during the Epoch of Reionization (EoR) and the Cosmic Dawn (CD). This exciting goal is challenged by the difficulty of extracting the feeble 21-cm signal buried under astrophysical foregrounds orders of magnitude brighter and contaminated by numerous instrumental systematics. Several experiments such as LOFAR, MWA, HERA, and NenuFAR are currently underway aiming at statistically detecting the 21-cm brightness temperature fluctuations from the EoR and CD. While no detection is yet in sight, considerable progress has been made recently. In this talk, I will review the many challenges faced by these difficult experiments and I will share the latest development of the LOFAR Epoch of Reionization and NenuFAR Cosmic Dawn key science projects.
Vendredi 17 avril 2020, 14h00
Salle de l'atelier, Paris
Patricia TISSERA
Universidad Andres Bello, Santiago, Chili
Vendredi 24 avril 2020, 14h00
Salle de l'atelier, Paris
Philippe ANDRE
Tous les séminaires...