Optical gravitational lensing experiment: Difference image analysis of OGLE-2000-BUL-43, a spectacular ongoing parallax microlensing event

被引：38

作者：

Soszynski, I

Zebrun, K

Wozniak, PR

Mao, S

Udalski, A

Szymanski, M

Kubiak, M

Pietrzynski, G

Szewczyk, O

Wyrzykowski, L

机构：

[1] Univ Warsaw Observ, PL-00478 Warsaw, Poland

[2] Princeton Univ Observ, Princeton, NJ 08544 USA

[3] Univ Manchester, Jodrell Bank Observ, Macclesfield SK11 9DL, Cheshire, England

[4] Univ Concepcion, Dept Fis, Concepcion, Chile

来源：

ASTROPHYSICAL JOURNAL | 2001年 / 552卷 / 02期

关键词：

gravitational microlensing; methods : data analysis;

D O I：

10.1086/320582

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the photometry and theoretical models for a Galactic bulge microlensing event, OGLE-2000-BUL-43. The event is very bright, with I = 13.54 mag, and has a very long timescale, t(E) = 156 days. The long timescale and its light curve deviation from the standard shape strongly suggest that it may be affected by the parallax effect. We show that OGLE-2000-BUL-43 is the first discovered microlensing event, in which the parallax distortion is observed over a period of 2 yr. Difference image analysis (DIA) using the PSF matching algorithm of Alard & Lupton enabled photometry accurate to 0.5%. All photometry obtained with DIA is available electronically Our analysis indicates that the viewing condition from a location near Jupiter will be optimal and could lead to magnifications of similar to 50 around 2001 January 31. These features offer a great promise for resolving the source (a K giant) and breaking the degeneracy between the lens parameters, including the mass of the lens, if the event is observed with the imaging camera on the Cassini space probe.

引用

页码：731 / 737

页数：7

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