Does the lens that caused OGLE 2004-BLG-273 harbour a planet?

Does the lens that caused OGLE 2004-BLG-273 harbour a planet?

First posted: 16-Jun-2004

After having reported that OGLE 2004-BLG-273 was rising to a fold-caustic exit in PLANET anomaly alert 2004 #3 (issued 2-Jun, 13:40 UT), PLANET managed to collect data over its course, which lasted about 15 hours and ended at HJD-2450000 = 3159.9, i.e. 3-Jun 9:40 UT.

Data collected until the end of the caustic exit does not allow an unambiguous determination of the mass ratio between the binary lens components, where a model involving a planet appears viable. The true nature of the binary lens will be resolved by observation of the ongoing further anomalous behaviour, which might involve peaks and further caustic passages. Please read the PLANET anomaly update 2004 #3-1 (issued 5-Jun, 14:05 UT) on this.

Until 6-Jun, 15:00 UT, OGLE 2004-BLG-273 has risen by ∼ 1.2 mag since the caustic exit, where it most recently brightened by about 0.08 mag per hour. A peak and/or caustic passages or approaches can be expected soon. More details can be found in PLANET anomaly update 2004 #3-2 (issued 6-Jun, 15:35 UT).

The event has passed a peak near 6-Jun, 22:50 UT and its lightcurve is close to that of a point-source-point-lens model for data obtained on or after 14-Jun.

Most recent PLANET and OGLE data for this event is shown on the regularly updated lightcurve.

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