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. Kozłowski, J. C. Bird, A. Cole, D. Higgins, J. McCormick, L. A.G. Monard, D. Polishook, A. Shporer, O. Spector, M. K. Szymański, M. Kubiak, G. Pietrzyński, I. Soszyński, O. Szewczyk, K. Ulaczyk, 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, W. Lin, C. H. Ling, S. Makita, K. Masuda, Y. Matsubara, N. Miyake, Y. Muraki, M. Nagaya, K. Nishimoto, K. Ohnishi, Y. C. Perrott, N. J. Rattenbury, T. Sako, To Saito, L. Skuljan, D. J. Sullivan, W. L. Sweatman, P. J. Tristram, P. C.M. Yock, M. D. Albrow, V. Batista, P. Fouqué, J. P. Beaulieu, D. P. Bennett, A. Cassan, J. Comparat, C. Coutures, S. Dieters, J. Greenhill, K. Horne, N. Kains, D. Kubas, R. Martin, J. Menzies, J. Wambsganss, A. Williams, M. Zub

Research output: Contribution to journalArticlepeer-review


We analyze the extreme high-magnification microlensing event OGLE-2008-BLG-279, which peaked at a maximum magnification of A ∼ 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 , and its distance, Dl = 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 ≃ 2 MMars with projected separations near the Einstein ring (∼3 AU).

Original languageEnglish
Pages (from-to)2082-2090
Number of pages9
JournalAstrophysical Journal
Issue number2
StatePublished - 2009


  • Gravitational lensing
  • Planetary systems
  • Planetary systems: formation


Dive into the research topics of 'Extreme magnification microlensing event OGLE-2008-BLG-279: Strong limits on planetary companions to the lens star'. Together they form a unique fingerprint.

Cite this