Masses and orbital constraints for the OGLE-2006-BLG-109Lb,c Jupiter/Saturn analog planetary system

Bennett, D. P.; Rhie, S. H.; Nikolaev, S.; Gaudi, B. S.; Udalski, A.; Gould, A.; Christie, G. W.; Maoz, D.; Dong, S.; McCormick, J.; Szymański, M. K.; Tristram, P. J.; Macintosh, B.; Cook, K. H.; Kubiak, M.; Pietrzyński, G.; Soszyński, I.; Szewczyk, O.; Ulaczyk, K.; Wyrzykowski, Ł.; DePoy, D. L.; Han, C.; Kaspi, S.; Lee, C.-U.; Mallia, F.; Natusch, T.; Park, B.-G.; Pogge, R. W.; Polishook, D.; Abe, F.; Bond, I. A.; Botzler, C. S.; Fukui, A.; Hearnshaw, J. B.; Itow, Y.; Kamiya, K.; Korpela, A. V.; Kilmartin, P. M.; Lin, W.; Ling, J.; Masuda, K.; Matsubara, Y.; Motomura, M.; Muraki, Y.; Nakamura, S.; Okumura, T.; Ohnishi, K.; Perrott, Y. C.; Rattenbury, N. J.; Sako, T.; Saito, To.; Sato, S.; Skuljan, L.; Sullivan, D. J.; Sumi, T.; Sweatman, W. L.; Yock, P. C. M.; Albrow, M.; Allan, A.; Beaulieu, J.-P.; Bramich, D. M.; Burgdorf, M. J.; Coutures, C.; Dominik, M.; Dieters, S.; Fouqué, P.; Greenhill, J.; Horne, K.; Snodgrass, C.; Steele, I.; Tsapras, Y.; Chaboyer, B.; Crocker, A. and Frank, S. (2010). Masses and orbital constraints for the OGLE-2006-BLG-109Lb,c Jupiter/Saturn analog planetary system. Astrophysical Journal, 713(2) pp. 837–855.



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, Mb = 231 ± 19 M, and Mc = 86 ± 7 M. 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 ε = 0.15 +0.17-0.10 and an orbital inclination of i = 64° +4°-7°. The 95% confidence level lower limit on the inclination of i > 49° implies that this planetary system can be detected and studied via radial velocity measurements using a telescope of ≳30 m aperture.

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