AAS Meeting #193 - Austin, Texas, January 1999
Session 108. Gravitational Lensing
Display, Saturday, January 9, 1999, 9:20am-4:00pm, Exhibit Hall 1

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[108.07] Limits on Planetary Companions in Microlensing Event OGLE-BUL-98-14

B. S. Gaudi, M. D. Albrow, J. P. Beaulieu, J. A. R. Caldwell, D. L. DePoy, M. Dominik, A. Gould, J. Greenhill, K. Hill, S. Kane, R. Martin, J. Menzies, R.M. Naber, R. W. Pogge, K. Pollard, P.D. Sackett, K.C. Sahu, P. Vermaak, R. Watson, A. Williams (PLANET Collaboration)

As part of an ongoing effort to detect second order effects in gravitational microlensing events, the Probing Lensing Anomalies NETwork (PLANET) collaboration has obtained nearly continuous photometry of the microlensing event OGLE-BUL-98-14 with four telescopes located in Tasmania, Perth, South Africa and Chile. The complete data set consists of over 500 points in I and 200 in V taken over a period of ~120 days, making this one of the most well sampled microlensing events to date. The scatter in I is ~2% (1 sigma). OGLE-BUL-98-14 was a high magnification event (maximum magnification > 10) with a timescale of ~40 days. These facts, combined with the high sampling rate and good photometry, make this an extremely promising event for detection of second order effects. We find that the observed lightcurve is completely consistent with a point-source point-lens model. We can rule out the presence of a companion with mass ratio >10-3 over a substantial range of projected separations. Furthermore, the lack of detected finite-source or parallax effects allows us to put a lower limit on the mass of the lens, Mlens > 0.1 Msun.

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