2002/07/03 by Y. Tsapras, Yiannis Tsapras, Keith Horne +18 · 2 citations
Physics and Astronomy · #Astro and Planetary Science #Astronomy #Astrophysics #Binary number #Bulge #Eclipse #Exoplanet #Galaxy #Gamma-ray bursts and supernovae #Gravitational lens #Gravitational microlensing #Hot Jupiter #Light curve #Mass ratio #Physics #Planet #Planetary system #Stars #Stellar, planetary, and galactic studies #Telescope #Transit (satellite) #astro-ph
paper · pdf · doi:10.1046/j.1365-8711.2002.05776.x
published in Monthly Notices of the Royal Astronomical Society 337(1), 41-48 (Oxford University Press) · accepted by MNRAS
arxiv created 2002/07/03 · openalex publication_date 2002/11/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We present observations of eight Galactic bulge microlensing events taken with the 1.0-m Jacobus Kapteyn Telescope (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 light curves 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 eight 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 per cent respectively for q = 10−3 and a∼RE for a Δχ2 threshold value of 60.