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OGLE-2003-BLG-262: Finite-Source Effects from a Point-Mass Lens | | Jaiyul Yoo
; D.L. DePoy
; A. Gal-Yam
; B.S. Gaudi
; A. Gould
; C. Han
; Y. Lipkin
; D. Maoz
; E.O. Ofek B.-G. Park
; R.W. Pogge
; A. Udalski
; I. Soszynski
; L. Wyrzykowski
; M. Kubiak
; M. Szymanski
; G. Pietrzynski
; O. Szewczyk
; K. Zebrun
; for The OGLE Collaboration
; | | Date: |
11 Sep 2003 | | Journal: | Astrophys.J. 603 (2004) 139-151 | | Subject: | astro-ph | | Affiliation: | The microFUN Collaboration) and A. Udalski , I. Soszynski , L. Wyrzykowski , M. Kubiak , M. Szymanski , G. Pietrzynski , O. Szewczyk , K. Zebrun , for The OGLE Collaboration ( OSU, Tel Aviv University, CfA, Chungbuk National University, Korea, Korea | | Abstract: | We analyze OGLE-2003-BLG-262, a relatively short, t_E=12.5+-0.1day, microlensing event generated by a point-mass lens transiting the face of a K giant source in the Galactic bulge. We use the resulting finite-source effects to measure the angular Einstein radius, theta_E=195+-17muas, and so constrain the lens mass to the full-width half-maximum interval 0.08 < M/M_sun < 0.54. The lens-source relative proper motion is mu_rel = 27+-2 km/s/kpc. Both values are typical of what is expected for lenses detected toward the bulge. Despite the short duration of the event, we detect marginal evidence for a "parallax asymmetry", but argue that this is more likely to be induced by acceleration of the source, a binary lens, or possibly by statistical fluctuations. Although OGLE-2003-BLG-262 is only the second published event to date in which the lens transits the source, such events will become more common with the new OGLE-III survey in place. We therefore give a detailed account of the analysis of this event to facilitate the study of future events of this type. | | Source: | arXiv, astro-ph/0309302 | | Services: | Forum | Review | PDF | Favorites | |
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