Masses and Orbital Constraints for the OGLE-2006-BLG-109Lb,c Jupiter/Saturn Analog Planetary System
Creators: name: Bennett, D. P.
name: Rhie, S. H.
name: Nikolaev, S.
name: Gaudi, B. S.
name: Udalski, A.
name: Gould, A.
name: Christie, G. W.
name: Maoz, D.
name: Dong, S.
name: McCormick, J.
name: Szymanski, M. K.
name: Tristram, P. J.
name: Macintosh, B.
name: Cook, K. H.
name: Kubiak, M.
name: Pietrzynski, G.
name: Soszynski, I.
name: Szewczyk, O.
name: Ulaczyk, K.
name: Wyrzykowski, L.
name: DePoy, D. L.
name: Han, C.
name: Kaspi, S.
name: Lee, C. -U.
name: Mallia, F.
name: Natusch, T.
name: Park, B. -G.
name: Pogge, R. W.
name: Polishook, D.
name: Abe, F.
name: Bond, I. A.
name: Botzler, C. S.
name: Fukui, A.
name: Hearnshaw, J. B.
name: Itow, Y.
name: Kamiya, K.
name: Korpela, A. V.
name: Kilmartin, P. M.
name: Lin, W.
name: Masuda, K.
name: Matsubara, Y.
name: Motomura, M.
name: Muraki, Y.
name: Nakamura, S.
name: Okumura, T.
name: Ohnishi, K.
name: Perrott, Y. C.
name: Rattenbury, N. J.
name: Sako, T.
name: Saito, To.
name: Sato, S.
name: Skuljan, L.
name: Sullivan, D. J.
name: Sumi, T.
name: Sweatman, W. L.
name: Yock, P. C. M.
name: Albrow, M.
name: Allan, A.
name: Beaulieu, J. -P.
name: Bramich, D. M.
name: Burgdorf, M. J.
name: Coutures, C.
name: Dominik, M.
name: Dieters, S.
name: Fouque, P.
name: Greenhill, J.
name: Horne, K.
name: Snodgrass, C.
name: Steele, I.
name: Tsapras, Y.
name: Chaboyer, B.
name: Crocker, A.
name: Frank, S.
Publisher: name: arXiv
Year: 2009
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We present a new analysis of the Jupiter+Saturn analog system, OGLE-2006-BLG-109Lb,c, which was the first double planet system discovered with the gravitational microlensing method. This is the only multi-planet system discovered by any method with measured masses for the star and both planets. In addition to the signatures of two planets, this event also exhibits a microlensing parallax signature and finite source effects that provide a direct measure of the masses of the star and planets, and the expected brightness of the host star is confirmed by Keck AO imaging, yielding masses of M_* = 0.51(+0.05-0.04) M_sun, M_b = 231+-19 M_earth, M_c = 86+-7 M_earth. The Saturn-analog planet in this system had a planetary light curve deviation that lasted for 11 days, and as a result, the effects of the orbital motion are visible in the microlensing light curve. We find that four of the six orbital parameters are tightly constrained and that a fifth parameter, the orbital acceleration, is weakly constrained. No orbital information is available for the Jupiter-analog planet, but its presence helps to constrain the orbital motion of the Saturn-analog planet. Assuming co-planar orbits, we find an orbital eccentricity of eccentricity = 0.15 (+0.17-0.10) and an orbital inclination of i = 64 (+4-7) deg. The 95% confidence level lower limit on the inclination of i &gt; 49 deg. implies that this planetary system can be detected and studied via radial velocity measurements using a telescope of &gt;30m aperture.
description: 48 pages including 10 figures, to be published in ApJ