1. An Extreme Magnification Event with a Strong Sensitivity to Planets
OGLE-2008-BLG-279
An Extreme Magnification Event with a Strong Sensitivity to Planets
Jennifer Yee
Collaborators: Andy Gould, Subo Dong, Scott Gaudi, Szymon Kozłowski, μFUN, OGLE, MOA, PLANET

2. Point-Source Point-LensX
f(u0)‏ tE X t0
Ml, Dl → mp, b(AU)‏

3. Additional Parameters from EMEs
Finite Source: ρ*
θE = θ*/ρ*
Terrestrial Parallax: πE
1/Dl = πs + θEπE
Ml = θE/(κπE)‏

5. Well-Measured Finite Source Effects
Impact Parameter
Impact Parameter/Source Size
Impact Parameter

6. Measured Parameters t0 = 4617.34784 ± 0.00007 days
tE = 110. ± 9 days
ρ* = ±
θE = θ*/ρ* = 0.90 ± 0.09 mas → rE = 3.3 ± 0.3 AU
Ml = θE/(κπE) = 0.69 ± 0.15 Mסּ
Dl = 3.7 ± 0.8 kpc

7. CMD

8. Identifying the Blend
V-I

9. Shear

10. Trajectory
Han (2009) ApJ, 691L

11. Shear

12. Planet Sensitivity

13. Planet Sensitivity

14. Planet Sensitivity

15. Planet Sensitivity

16. Detection Efficiency
99%
25%

17. Conclusions Measured Finite Source Effects
Measured Terrestrial Parallax
Ml = 0.69 Mסּ, Dl = 3.7 kpc
Sensitivity to planets mp> 2 MMars
Rule out planets mp = 1 MJup, b=[0.6,19.5] AU