Planet Sensitivity from Combined Ground- and Space-based Microlensing Observations

December 2015 • 2015ApJ...814..129Z

Authors • Zhu, Wei • Gould, Andrew • Beichman, Charles • Calchi Novati, Sebastiano • Carey, Sean • Gaudi, B. Scott • Henderson, Calen B. • Penny, Matthew • Shvartzvald, Yossi • Yee, Jennifer C. • Udalski, A. • Poleski, R. • Skowron, J. • Kozłowski, S. • Mróz, P. • Pietrukowicz, P. • Pietrzyński, G. • Szymański, M. K. • Soszyński, I. • Ulaczyk, K. • Wyrzykowski, Ł. • OGLE Collaboration • Abe, F. • Barry, R. K. • Bennett, D. P. • Bhattacharya, A. • Bond, I. A. • Freeman, M. • Fukui, A. • Hirao, Y. • Itow, Y. • Koshimoto, N. • Ling, H. • Masuda, K. • Matsubara, Y. • Muraki, Y. • Nagakane, M. • Ohnishi, K. • Saito, To. • Sullivan, D. J. • Sumi, T. • Suzuki, D. • Tristram, P. J. • Rattenbury, N. • Wakiyama, Y. • Yonehara, A. • MOA Collaboration • Maoz, D. • Kaspi, S. • Friedmann, M. • WISE Group

Abstract • To move one step forward toward a Galactic distribution of planets, we present the first planet sensitivity analysis for microlensing events with simultaneous observations from space and the ground. We present this analysis for two such events, OGLE-2014-BLG-0939 and OGLE-2014-BLG-0124, which both show substantial planet sensitivity even though neither of them reached high magnification. This suggests that an ensemble of low to moderate magnification events can also yield significant planet sensitivity, and therefore probability, for detecting planets. The implications of our results to the ongoing and future space-based microlensing experiments to measure the Galactic distribution of planets are discussed.


IPAC Authors


Sebastiano Calchi Novati

Associate Scientist

Sean Carey

Senior Scientist