Uncovering Galactic and Extragalactic Planets by Gravitational Microlensing

Details Uncovering Galactic and Extragalactic Planets by Gravitational Microlensing Uncovering Galactic and Extragalactic Planets by Gravitational Microlensing

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005tmgm.meet.1633d&link_type=abstract

The Tenth Marcel Grossmann Meeting. Proceedings of the MG10 Meeting held at Brazilian Center for Research in Physics (CBPF), Rio

Physics

Scientific paper

With its planet detection efficiency reaching a maximum for orbital radii between 1 and 10 AU, microlensing provides a unique sensitivity to planetary systems similar to our own around galactic and even extragalactic stars acting as lenses on observed background stars, and in particular can detect terrestrial planets in the habitable zone. The absence of planetary signals in the 1995-1999 PLANET data implies that less than 1/3 of galactic M-dwarfs harbour jupiters at orbital radii between 1.5 and 4 AU. If a fraction fp of stars is surrounded by a planet, annual detections of 15-25 fp jupiters and 2-3 fp earths around galactic stars would result from PLANET, a space-based campaign would yield 1200 fp jupiters and 30 fp earths, and a northern microlensing network could detect 15-35 fp jupiters and 4-10 fp saturns around M31 stars.

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