We present the MOA Collaboration light curve data for planetary microlensing event OGLE-2015-BLG-0954, which was previously announced in a paper by the KMTNet and OGLE Collaborations. The MOA data cover the caustic exit, which was not covered by the KMTNet or OGLE data, and they provide a more reliable measurement of the finite source effect. The MOA data also provide a new source color measurement that reveals a lens-source relative proper motion of μrel=11.8±0.8mas/yr, which compares to the value of μrel=18.4±1.7mas/yr reported in the KMTNet-OGLE paper. This new MOA value for μrel has an a priori probability that is a factor of ∼100 times larger than the previous value, and it does not require a lens system distance of DL<1kpc. Based on the corrected source color, we find that the lens system consists of a planet of mass 3.4−1.6+3.7MJup orbiting a 0.30−0.14+0.34M⊙ star at an orbital separation of 2.1−1.0+2.2AU and a distance of 1.2−0.5+1.1kpc.
@article{arxiv.1705.03937,
title = {MOA Data Reveal a New Mass, Distance, and Relative Proper Motion for Planetary System OGLE-2015-BLG-0954L},
author = {D. P. Bennett and I. A. Bond and F. Abe and Y. Asakura and R. Barry and A. Bhattacharya and M. Donachie and P. Evans and A. Fukui and Y. Hirao and Y. Itow and N. Koshimoto and M. C. A. Li and C. H. Ling and K. Masuda and Y. Matsubara and Y. Muraki and M. Nagakane and K. Ohnishi and C. Ranc and N. J. Rattenbury and To. Saito and A. Sharan and D. J. Sullivan and T. Sumi and D. Suzuki and P. J. Tristram and T. Yamada and T. Yamada and A. Yonehara},
journal= {arXiv preprint arXiv:1705.03937},
year = {2017}
}