Implications On The Non-detection Of Brown Dwarfs And Planetary-mass Objects From Sweeps Data Through Microlensing

Details Implications On The Non-detection Of Brown Dwarfs And Planetary-mass Objects From Sweeps Data Through Microlensing Implications On The Non-detection Of Brown Dwarfs And Planetary-mass Objects From Sweeps Data Through Microlensing

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ess.....2.2102s&link_type=abstract

American Astronomical Society, ESS meeting #2, #21.02

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 and brown dwarfs 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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