Spitzer Observations of OGLE-2015-BLG-1212 Reveal a New Path to Breaking Strong Microlens Degeneracies

V. Bozza , Y. Shvartzvald , A. Udalski , S. Calchi Novati , I.A. Bond , C. Han , M. Hundertmark , R. Poleski

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M. Pawlak M. K. Szyma\'nski J. Skowron P. Mr\'oz S. Koz{\l}owski {\L}. Wyrzykowski P. Pietrukowicz I. Soszy\'nski K. Ulaczyk C. Beichman G. Bryden S. Carey M. Fausnaugh B. S. Gaudi A. Gould C. B. Henderson R. W. Pogge B. Wibking J. C. Yee W. Zhu F.Abe Y. Asakura R.K. Barry D.P. Bennett A. Bhattacharya M. Donachie M. Freeman A. Fukui Y. Hirao K. Inayama Y. Itow N. Koshimoto M.C.A. Li C.H. Ling K. Masuda Y. Matsubara Y. Muraki M. Nagakane T. Nishioka K. Ohnishi H. Oyokawa N. Rattenbury T. Saito A. Sharan D.J. Sullivan T. Sumi D. Suzuki P.J. Tristram Y. Wakiyama A. Yonehara J.-Y.Choi H. Park Y. K. Jung I.-G. Shin M. D. Albrow B.-G. Park S.-L. Kim C.-U. Lee S.-M. Cha D.-J. Kim Y. Lee M. Dominik U.G. J{\o}rgensen M.I. Andersen D.M. Bramich M.J. Burgdorf S. Ciceri G. D'Ago D. F. Evans R. Figuera Jaimes S.-H. Gu T. C. Hinse N. Kains E. Kerins H. Korhonen M. Kuffmeier L. Mancini A. Popovas M. Rabus S. Rahvar R.T. Rasmussen G. Scarpetta J. Skottfelt C. Snodgrass J. Southworth J. Surdej E. Unda-Sanzana C. von Essen Y.-B. Wang O. Wertz D. Maoz M. Friedmann S. Kaspi

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keywords observationsbinarydegeneraciesmodelsogle-2015-blg-1212onlyparallaxplanetary

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Spitzer microlensing parallax observations of OGLE-2015-BLG-1212 decisively breaks a degeneracy between planetary and binary solutions that is somewhat ambiguous when only ground-based data are considered. Only eight viable models survive out of an initial set of 32 local minima in the parameter space. These models clearly indicate that the lens is a stellar binary system possibly located within the bulge of our Galaxy, ruling out the planetary alternative. We argue that several types of discrete degeneracies can be broken via such space-based parallax observations.

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Spitzer Observations of OGLE-2015-BLG-1212 Reveal a New Path to Breaking Strong Microlens Degeneracies

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