EXTREME MAGNIFICATION MICROLENSING EVENT OGLE-2008-BLG-279: STRONG LIMITS ON PLANETARY COMPANIONS TO THE LENS STAR

J. C. Yee*, A. Udalski, T. Sumi, Subo Dong, S. Kozlowski, J. C. Bird, A. Cole, D. Higgins, J. McCormick, L. A. G. Monard, D. Polishook, A. Shporer, O. Spector, M. K. Szymanski, M. Kubiak, G. Pietrzynski, I. Soszynski, O. Szewczyk, K. Ulaczyk, L. WyrzykowskiR. Poleski, W. Allen, M. Bos, G. W. Christie, D. L. DePoy, J. D. Eastman, B. S. Gaudi, A. Gould, C. Han, S. Kaspi, C. -U. Lee, F. Mallia, A. Maury, D. Maoz, T. Natusch, B. -G. Park, R. W. Pogge, R. Santallo, F. Abe, I. A. Bond, A. Fukui, K. Furusawa, J. B. Hearnshaw, S. Hosaka, Y. Itow, K. Kamiya, A. V. Korpela, P. M. Kilmartin, K. Horne, N. Kains, OGLE Collaboration, μFUN Collaboration, MOA Collaboration, PLANET Collaboration

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)

Abstract

We analyze the extreme high-magnification microlensing event OGLE-2008-BLG-279, which peaked at a maximum magnification of A similar to 1600 on 2008 May 30. The peak of this event exhibits both finite-source effects and terrestrial parallax, from which we determine the mass of the lens, M-l = 0.64 +/- 0.10 M-circle dot, and its distance, D-l = 4.0 +/- 0.6 kpc. We rule out Jupiter-mass planetary companions to the lens star for projected separations in the range 0.5-20 AU. More generally, we find that this event was sensitive to planets with masses as small as 0.2 M-circle dot similar or equal to 2 (MMars) with projected separations near the Einstein ring (similar to 3 AU).

Original languageEnglish
Pages (from-to)2082-2090
Number of pages9
JournalAstrophysical Journal
Volume703
Issue number2
DOIs
Publication statusPublished - 1 Oct 2009

Keywords

  • gravitational lensing
  • planetary systems
  • planetary systems: formation
  • JOVIAN-MASS PLANET
  • EXTRASOLAR PLANETS
  • DETERMINISTIC MODEL
  • PHOTOMETRY
  • STELLAR
  • COOL
  • CONSTRAINTS
  • EXOPLANETS
  • DISCOVERY
  • SYSTEMS

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