Constraints on Jupiters from observations of Galactic Bulge microlensing events during 2000.
Date
2002-06-10Author
Tsapras, Yiannis
Horne, Keith
Carson, Richard
Alvarez, Javier
Batcheldor, Dan
Graham, Alister
James, Philip
Knapen, Johan
Quaintrell, Hannah
Serrano, Ignacio
Sorensen, Peter
Wooder, Nick
Metadata
Show full item recordAbstract
We present observations of 8 Galactic Bulge microlensing events taken with the 1.0m
JKT on La Palma during 2000 June and July. The JKT observing schedule was optimized
using a prioritizing algorithm to automatically update the target list. For most
of these events we have sampled the lightcurves at times where no information was
available from the OGLE alert team. We assume a point-source point-lens (PSPL)
model and perform a maximum likelihood fit to both our data and the OGLE data to
constrain the event parameters of the fit.We then refit the data assuming a binary lens
and proceed to calculate the probability of detecting planets with mass ratio q = 10−3.
We have seen no clear signatures of planetary deviations on any of the 8 events and
we quantify constraints on the presence of planetary companions to the lensing stars.
For two well observed events, 2000BUL31 and 2000BUL33, our detection probabilities
peak at 30% and 20% respectively for q = 10−3 and a RE for a 2 threshold
value of 60.