Limits on Substellar and Planetary-Mass Objects through Microlensing from Sweeps Data

Details Limits on Substellar and Planetary-Mass Objects through Microlensing from Sweeps Data Limits on Substellar and Planetary-Mass Objects through Microlensing from Sweeps Data

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21360105s&link_type=abstract

American Astronomical Society, AAS Meeting #213, #601.05

Astronomy and Astrophysics

Astronomy

Scientific paper

The SWEEPS project used the HST/ACS to carry out photometric monitoring of 230,000 F, G, K and M dwarfs in a dense stellar field in the Galactic bulge. During a 7-day monitoring interval we discovered 16 candidate transiting extrasolar planets with periods of 0.45 to 4.2 days. The SWEEPS data are also sensitive to detecting planetary-mass objects through their microlensing signal. No such microlensing event was detected among the 230,000 stars monitored. One implication of this non-detection is that the contribution of planetary-mass objects (in the mass range 1 Earth mass to 10 Jupiter mass) to the total mass budget is small. Details of the procedure, and further implications of this non-detection will be discussed.

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