Extreme Magnification Microlensing Event OGLE-2008-BLG-279: Strong Limits On Planetary Companions to the Lens Star

Yee, J. C.; Udalski, A.; Sumi, T.; Dong, Subo; Kozłowski, S.; Bird, J. C.; Cole, A.; Higgins, D.; McCormick, J.; Monard, L. A. G.; Polishook, D.; Shporer, A.; Spector, O.; Szymański, M. K.; Kubiak, M.; Pietrzyński, G.; Soszyński, I.; Szewczyk, O.; Ulaczyk, K.; Wyrzykowski, Ł.; Poleski, R.; The OGLE Collaboration; Allen, W.; Bos, M.; Christie, G. W.; DePoy, D. L.; Eastman, J. D.; Gaudi, B. S.; Gould, A.; Han, C.; Kaspi, S.; Lee, C.-U.; Mallia, F.; Maury, A.; Maoz, D.; Natusch, T.; Park, B.-G.; Pogge, R. W.; Santallo, R.; The μFUN Collaboration; Abe, F.; Bond, I. A.; Fukui, A.; Furusawa, K.; Hearnshaw, J. B.; Hosaka, S.; Itow, Y.; Kamiya, K.; Korpela, A. V.; Kilmartin, P. M.; Lin, W.; Ling, C. H.; Makita, S.; Masuda, K.; Matsubara, Y.; Miyake, N.; Muraki, Y.; Nagaya, M.; Nishimoto, K.; Ohnishi, K.; Perrott, Y. C.; Rattenbury, N. J.; Sako, T.; Saito, To.; Skuljan, L.; Sullivan, D. J.; Sweatman, W. L.; Tristram, P. J.; Yock, P. C. M.; The MOA Collaboration; Albrow, M. D.; Batista, V.; Fouqué, P.; Beaulieu, J.-P.; Bennet, D. P.; Cassan, A.; Comparat, J.; Coutures, C.; Dieters, S.; Greenhill, J.; Horne, K.; Kains, N.; Kubas, D.; Martin, R.; Menzies, J.; Wambsganss, J.; Williams, A.; Zub, M.; The PLANET Collaboration

Issue Date:

2009-10-01

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Publisher:

American Astronomical Society

Citation:

J. C. Yee et al, "Extreme Magnification Microlensing Event OGLE-2008-BLG-279: Strong Limits On Planetary Companions to the Lens Star," The Astrophysical Journal 703, no. 2 (2009), doi:10.1088/0004-637X/703/2/2082

DOI:

10.1088/0004-637X/703/2/2082

Abstract:

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 Msun, 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 0.2M_+sun ~= 2M_mars with projected separations near the Einstein ring (~3 AU).

Type:

Article

ISSN:

1538-4357

URI:

http://hdl.handle.net/1811/47809

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Ohio State University Research and Scholarship