Jean-Marc Bonnet-Bidaud (born 1950) is a French astrophysicist at the Atomic Energy and Alternative Energies Commission (CEA). He is a specialist in high-energy astrophysics and in the study of highly condensed stars in the galaxy (

white dwarf A white dwarf is a Compact star, stellar core remnant composed mostly of electron-degenerate matter. A white dwarf is very density, dense: in an Earth sized volume, it packs a mass that is comparable to the Sun. No nuclear fusion takes place i ...

neutron star A neutron star is the gravitationally collapsed Stellar core, core of a massive supergiant star. It results from the supernova explosion of a stellar evolution#Massive star, massive star—combined with gravitational collapse—that compresses ...

s and

black hole A black hole is a massive, compact astronomical object so dense that its gravity prevents anything from escaping, even light. Albert Einstein's theory of general relativity predicts that a sufficiently compact mass will form a black hole. Th ...

s). He is also active in the field of the

history of astronomy The history of astronomy focuses on the contributions civilizations have made to further their understanding of the universe beyond earth's atmosphere. Astronomy is one of the oldest natural sciences, achieving a high level of success in the sec ...

and in charge of the public outreach for astronomy at CEA.

Scientific work

Among his highest citation scientific papers are the discovery and collaborative study of an atypical

supernova A supernova (: supernovae or supernovas) is a powerful and luminous explosion of a star. A supernova occurs during the last stellar evolution, evolutionary stages of a massive star, or when a white dwarf is triggered into runaway nuclear fusion ...

observed in 2006, a scientific review on the enigmatic X-ray source Cygnus X-3 and its reported very high energy emission and the discovery of abnormal CNO abundances among accreting magnetic white dwarfs. From 2009, Jean-Marc Bonnet-Bidaud is involved in the StarAcc project (initially POLAR project) which aims to reproduce in the laboratory physical conditions similar to those existing on the surface of magnetic white dwarfs thanks to the use of lasers of power. The POLAR project reached an essential milestone in 2016 by demonstrating for the first time the possibility of reproducing in the laboratory an accretion structure (accretion shock and radiative zone) in agreement with numerical predictions and astrophysical observations This result opens the way to the use of very energetic lasers, such as the NIF () or the LMJ (Laser Megajoule-France), to achieve radiative regimes strictly homothetic to the astrophysical situation. Ultimately, these experiments should make it possible to reliably produce miniature models in the laboratory that are almost analogous to real astrophysical conditions.

History of science

History of cosmology

With the philosopher of science Thomas Lepeltier, Jean-Marc Bonnet-Bidaud co-directed the publication in 2012 of the collective work ''Un autre cosmos ?''. The central idea of the book is to encourage researchers to look into alternative cosmological models to that of the Big Bang. In 2021, Jean-Marc Bonnet-Bidaud and Thomas Lepeltier published the work ''Big Bang - Histoire critique d'une idée'', in which the evolution of the idea of an expanding universe evolving at from a hot phase, at the basis of the current cosmology of the Big Bang is discussed. The authors show how this basic hypothesis evolved in several stages to arrive at the current model known as LCDM (Lamba-Cold-Dark-Matter) in which 95% of the content of the universe remains unknown. A critical analysis is provided of the assumptions underlying this model, highlighting the current difficulties.

Chinese astronomy

Bonnet-Bidaud is the author of the first scientific study of the oldest known stellar map, the Dunhuang Star Chart, also known as the S.3326 manuscript, a document found in China along the Silk road and now kept at the

British Library The British Library is the national library of the United Kingdom. Based in London, it is one of the largest libraries in the world, with an estimated collection of between 170 and 200 million items from multiple countries. As a legal deposit li ...

London, England London is the Capital city, capital and List of urban areas in the United Kingdom, largest city of both England and the United Kingdom, with a population of in . London metropolitan area, Its wider metropolitan area is the largest in Wester ...

. The study concludes to a now revised datation at +650-685, making the chart contemporary of the early

Tang dynasty The Tang dynasty (, ; zh, c=唐朝), or the Tang Empire, was an Dynasties of China, imperial dynasty of China that ruled from 618 to 907, with an Wu Zhou, interregnum between 690 and 705. It was preceded by the Sui dynasty and followed ...

and most probably produced by the famous Chinese astronomer

Li Chunfeng Li Chunfeng (; 602–670) was a Chinese astronomer, historian, mathematician, and politician who was born in today's Baoji, Baoji, Shaanxi, during the Sui dynasty, Sui and Tang dynasty, Tang dynasties. He was first appointed to the Imperial Astr ...

. He has produced in 2017 the book
4000 ans d'astronomie chinoise
', that gives an overview of the astronomical discoveries made in China over centuries. The book has been translated in Chinese in 2020 : ''书名:4000年中国天文史''.

Bibliography

Books

*
Les sciences de l'Empire du Milieu
', Edition Belin, 2023 *
Big Bang - Histoire critique d'une idée
', Jean-Marc Bonnet-Bidaud et Thomas Lepeltier, Edition Gallimard-Folio, 2021 *
书名:4000年中国天文史
', Edition CITIC (2020) () *
4000 ans d'astronomie chinoise
', Edition Belin (2017) () * ''Variations sur un même ciel'' (2012) with Aurélien Barrau and Michel Cassé * ''Le Soleil dans la peau'' (2012) with Alain Froment, Patrick Moureaux and Aymeric Petit * ''Un autre cosmos ?'' (2012) * ''Le big bang n'est pas une théorie comme les autres'' (2009) with François-Xavier Désert, Dominique Leglu and Gilbert Reinisch * ''Etoiles dans la nuit des temps'' (2009) * ''Daniel Pontoreau'' (2002) with Ann Hindry and Luc Lang * ''L'Etat des Sciences'' (1991)

Films

* ''The Dunhuang star chart'' (2009) with Jérôme Blumberg, CNRS Images * ''Enigmes de Sirius'' (2008) with Jérôme Blumberg, CNRS Images * ''Sirius, the Dogon star'' (1999) with Jérôme Blumberg, CNRS Images media-FEMIS-CICT

References

External links

Personal website of Jean-Marc Bonnet-Bidaud

Scientific publications
from the

NASA The National Aeronautics and Space Administration (NASA ) is an independent agencies of the United States government, independent agency of the federal government of the United States, US federal government responsible for the United States ...

database ADS
Variations sur un même ciel

Le big bang n'est pas une théorie comme les autres

The Dunhuang star chart

Enigmes de Sirius

Sirius, the Dogon star
{{DEFAULTSORT:Bonnet-Bidaud, Jean-Marc 20th-century French astronomers 1950 births Living people French astrophysicists