Feb 28, 2021
An European prize for ground-breaking contributions in stellar astrophysics

The 2021 MERAC Prize for the Best Early Career Researcher in Theoretical Astrophysics is awarded to Dr Antoine Strugarek (CEA Saclay, France) for ground- breaking contributions in stellar astrophysics, including dynamo theory, predictions of solar flares and pioneering work on star-exoplanet interactions. The prize from the MERAC foundation (Mobilization for European Research in Astrophysics and Cosmology) is awarded each year by the European Society of Astronomy (ESA).

Feb 10, 2021

Imaging planets that could potentially sustain life around nearby stars has become a possibility thanks to advances reported by an international team of astronomers in the journal Nature Communications. Using a newly developed system for mid-infrared exoplanet imaging in combination with a very long observation time, they achieved the capability of directly imaging planets about three times the size of Earth within the habitable zones of nearby stars. This experiment, called NEAR (Near Earths in the AlphaCen Region), was performed using VISIR, a mid-infrared instrument built by the Astrophysical Department of CEA-IRFU. The VISIR camera has been adapted to  a 8m large telescope VLT UT4 (Yepun) in Chile, with a specific star-light blocking device and a a built-in adaptive optics sytems to correct for the atmospheric turbulence. A potential Neptune-to Saturn-sized planet orbiting Alpha Centauri may have been pinpointed but still requires further confirmation.

See the video : Breakthrough Watch/NEAR

Feb 03, 2021
A major contribution in International Leadership in Physics

The American Institute of Physics announced the astrophysicist Catherine Cesarsky as the recipient of the 2020 John Torrence Tate Prize for her major international role in leading major astronomical observatories and other prestigious organizations such as the International Astronomical Union. Named after the celebrated American physicist John Torrence Tate (1889-1950), the Tate medal was established in 1959 and is awarded every two years to non-U.S. citizens for their leadership, research contributions, and service to the international physics community.

Catherine Cesarsky, High Commissioner for Atomic Energy from 2009 to 2012 and today High Scientific Advisor to the General Administrator, headed the Department of Astrophysics at CEA from 1985 to 1993, then the direction of all CEA basic research in physics and chemistry from 1994 to 1999. She served as the director general of the European Southern Observatory (ESO) from 1999 to 2007 where she notably supervised the end of construction and the commissioning of the Very Large Telescope (VLT). She chaired the International Astronomical Union (IAU) from 2006 to 2009 and has just been appointed on February 3, 2021 to head the Council of the Square Kilometer Array Observatory, the world's largest radio telescope under construction in Australia and South Africa.

Catherine Cesarsky will be presented with the Tate medal during a plenary session of the European Astronomical Society Annual Meeting, to be held in virtual form in Leiden (Netherlands), in June 2021.

Jan 13, 2021

Nearly 200 researchers were involved in collecting, processing and assembling images of half the sky to prepare for the start of observations by DESI, the Dark Energy Spectroscopic Instrument, which aims to solve the mystery of dark energy.

In order for DESI to begin its 5-year mission (2021-2026) to produce the largest 3D sky map ever made, researchers first needed a gigantic 2D map of the Universe. Based on 200,000 images from 1405 nights of observations on three telescopes and several years of satellite data, this 2D map is the largest ever produced, based on the area of sky covered, the depth of the imagery and the more than one billion images of galaxies it contains.

Jan 11, 2021

he "cosmic noon", when the universe was 4 to 5 billion years old, marked a very active period of star formation for most galaxies. Paradoxically, about a third of the most massive galaxies at that time were dead and no longer forming stars. To date, the shut down of star formation in galaxies is often attributed to gas outflows caused by the feedback of supermassive black holes, but their impact on the galaxies of the young Universe has not yet been definitively established.

Thanks to the ALMA interferometer, a team of astrophysicists in which the Astrophysics Department / AIM Laboratory of CEA Paris-Saclay is strongly involved, has detected an exceptional gas ejection in a massive galaxy at cosmic noon, called ID2299. According to their analyses the scenario of this announced death cannot come from black holes, but from the fusion of two galaxies which is at the origin of the galaxy. What if with this new scenario, we revisit the autopsy reports of dead galaxies... The quantitative observations of this study raise questions. The results have just been published in the journal Nature Astronomy:  https://www.nature.com/articles/s41550-020-01268-x .

 

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