Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/25809

Download PDF (Author's final draft) (Adobe Acrobat PDF, -1 bytes)

Title

Constraints 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

Abstract

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 ~RE for a Δx2 threshold value of 60.

Publication type

Journal article

Source

Monthly Notices of the Royal Astronomical Society, Vol. 337, no. 1 (Nov 2002), pp. 41-48

Publication year

2002

FOR Code(s)

0201 Astronomical and Space Sciences

Keyword(s)

Bulge;  Galaxies;  Gravitational lensing;  Photometric techniques;  Planetary systems

Publisher

Blackwell

ISSN

0035-8711

Publisher URL

http://dx.doi.org/10.1046/j.1365-8711.2002.05776.x

Copyright

Copyright © 2002 Royal Astronomical Society. The accepted manuscript of this paper is reproduced here in accordance with the copyright policy of the publisher. The definitive publication is available at www.interscience.wiley.com.

Full text

Peer reviewed