Search for planetary mass objects in the Galactic halo through microlensing

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Galaxy: Halo, Kinematics And Dynamics, Stellar Content, Dark Matter, Gravitational Lensing

Scientific paper

We present final results from a search for gravitational microlensing of stars in the Magellanic Clouds by very light machos (MAssive Compact Halo Objects) in the Galactic Halo. The EROS programme used a CCD camera devoted to the detection of events with a duration ranging from 15 minutes to a few days; none of the 350,000 light curves exhibits a form which is consistent with a microlensing event. Using our detection efficiency, largely affected by the finite size of the source and blending effects at the lowest durations, and different models of the Galaxy, we can exclude planetary mass objects as a major constituent of the dark Halo. Based on observations made at the European Southern Observatory, La Silla, Chile.

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