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Division of Electronics, Detectors and Computing for Physics (DEDIP)


Institute of Research into the Fundamental Laws of the Universe
« Projects
Lack of planets near fast-rotating stars: observational bias or physical cause?
Jan 17, 2024
Lack of planets near fast-rotating stars: observational bias or physical cause?
To unravel this mystery, several teams with diverse skills from the Astrophysics Department had to come together, as the architecture that unites the star to its planet is highly complex. They had to combine a detailed understanding of stellar and planetary physics, exploring their interactions, with a thorough knowledge of the observations made by NASA's Kepler satellite to be able to decipher the data.
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Apr 28, 2021
Towards a systematic search for magnetic fields in evolved stars
An international collaboration led by a team from the Astrophysics Department/AIM Laboratory of IRFU has predicted and characterised the expected signature of internal magnetic fields in stars through their seismology - called asteroseismology.
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Towards a systematic search for magnetic fields in evolved stars
Asteroseismology confirms older stars are spinning faster than expected
Apr 22, 2021
Asteroseismology confirms older stars are spinning faster than expected
An international team including researchers from the Astrophysics Department (DAp) of CEA/Irfu, working in particular at the laboratory for the Dynamics of Stars, (Exo) planets and their Environment  (LDE3), has been able to demonstrate that stars rotate faster than expected as they get older.
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Oct 07, 2019
Lisa Bugnet, astrophysicist at the CEA, 2019 winner of the L'Oréal-Unesco Prize for Women in Science
Lisa Bugnet is one of 35 young women researchers who won the L'Oréal-Unesco Fellowships for Women in Science in 2019. As an asteroseismologist at the Dynamic Laboratory of Stars, (Exo)planets and their Environment of the DAP/Irfu, she uses seismic waves emitted by stars to probe their heart and understand their evolution from birth to the end of their life.
Lisa Bugnet, astrophysicist at the CEA, 2019 winner of the L'Oréal-Unesco Prize for Women in Science
Giant crash in the planetary system Kepler-107
Jan 27, 2019
Giant crash in the planetary system Kepler-107
An international collaboration, involving the Astrophysics Department-Laboratory AIM of CEA irfu, participated in the study of an exoplanetary system, Kepler-107 and revealed an amazing distribution of its 4 planets of which two seem potentially resulting from a giant impact. Thanks to asteroseismology (the study of star vibrations) and the modeling of planetary transits, researchers have been able to determine the mass and radius of the central star and its planets with great precision.
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Mar 13, 2017
The axis conspiracy
Mysterious alignment of the rotation axis of stars in two clusters
The stars do not play dice! It is the extraordinary discovery that the researchers of the Department of Astrophysics-Laboratoire AIM of the CEA-Irfu made by succeeding in determining the orientation in the space of the axis of rotation of stars belonging to two clusters of stars, thanks to asteroseismology. About 70% of the observed stars have perfectly aligned axes of rotation, in formal contradiction with the star formation models which predict that these axes of rotation should be randomly distributed.
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The axis conspiracy
The oscillations of the Sun are reflected by the planet Neptune
Feb 16, 2017
The oscillations of the Sun are reflected by the planet Neptune
In an article published in the Astrophysical Journal, an international team including two researchers from the Astrophysics Department- AIM Laboratory at CEA-Irfu, successfully detected the trace of solar oscillations in the light reflected by the planet. These very Low luminosity variations originate from the vibrations of the solar surface. The data were obtained from the Kepler/K2 (NASA) satellite which observed for 49 days continuously the planet located at an average distance of 4.5 billion kilometers from Earth.
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Jan 19, 2016
Strong magnetic fields discovered in majority of stars
Finding to impact understanding of stellar evolution
An international collaboration, involving the Astrophysics Department-AIM Laboratory of CEA-IRFU, managed to determine, from asteroseismology, that up to 65% of stars more massive than the Sun (between 1.6 and 2 solar masses) have a very high internal magnetic field. So far, only 5-10% of these stars were suspected to have a magnetic field up to 10 million times that of Earth.
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Strong magnetic fields discovered in majority of stars

 

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