The EROS Experiment Microlensing Survey

EROS stands for 'Expérience pour la Recherche d'Objets Sombres'
and has known 2 observational phases :
EROS-1 (1990-1995) and EROS-2 (1996-2003)

About EROS

GSA project


La Silla


Eros former site.

Other experiments


Eros Tools


Eros Collaboration

Private area

Monday meeting

The list of available papers related to the EROS experiment is there.

Presentation :
Its main objective is the search and the study of dark stellar bodies, so-called "brown dwarfs" or "MACHOs" which belong gravitationally to our Galaxy. This is made possible by their gravitational microlensing effects on stars in the Magellanic Clouds (two dwarf galaxies, Milky Way satellites). More information is available on this page...

Eros is financed jointly by CEA (Dapnia) and CNRS ( IN2P3 and INSU)

One Microlensing effect...
One image before, and the other, two years latter during the maximum of amplification :


6 New Magellanic R Coronae Borealis stars New Magellanic Cloud R Coronae Borealis and DY Per type stars from the EROS-2 database (May.2009)

New Beat Cepheids found in the Magellanic Clouds The beat Cepheids in the Magellanic Clouds: an analysis from the EROS-2 database (Jan.2009)

14 New Bulge R Coronae Borealis stars R Coronae Borealis stars in the Galactic Bulge discovered by EROS-2 (Jan.2008)

Limit on Machos : Limits on the Macho Content of the Galactic Halo from the EROS-2 Survey of the Magellanic Clouds (june 2007)

Galactic bulge microlensing optical depth and light curves from EROS2 (january 2006)

5 R Coronae Borealis stars candidates found in the Small Magellanic Cloud (may 2004)

ESO Press Release about EROS-2000-BLG-05 (25 April 2001)


Alain Milsztajn of Saclay describes results from the microlensing technique (may 2000).

At the TAUP99 conference, EROS2 announced new limits on the dark halo of our galaxy. Press release (in french)

Results of the EROS SN search (1997) : our candidates.

Macho announced a binary lens alert towards the SMC (MACHO-SMC-98-1).Here is the light curve we established, starting within the caustic crossing night (18/06/98), and zooms on the first night.

An article for Astronomy and Astrophysics giving the constraints one may extract from our light-curve of MACHO-SMC-98-1.

Updated : 07th september 2006,