Open AccessConstraints on Jupiters from observations of Galactic bulge microlensing events during 2000
Author(s) -
Tsapras Yiannis,
Horne Keith,
Carson Richard,
Alvarez Javier Méndez,
Batcheldor Dan,
Graham Alister W.,
James Philip A.,
Knapen Johan,
Quaintrell Hannah,
Serrano Ignacio Gonzalez,
Sorensen Peter,
Wooder Nick
Publication year - 2002
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2002.05776.x
Subject(s) - gravitational microlensing , physics , bulge , astrophysics , gravitational lens , exoplanet , telescope , stars , planet , planetary system , transit (satellite) , light curve , astronomy , hot jupiter , mass ratio , eclipse , binary number , galaxy , public transport , redshift , political science , law , arithmetic , mathematics
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 ∼ R E for a Δχ 2 threshold value of 60.