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,Cliff Han,M Hundertmark,R Poleski,Mathias Pawlak,M K Szymanski,J Skowron,P Mroz,S Kozlowski,ł Wyrzykowski,P Pietrukowicz,I Soszynski,K Ulaczyk,Chas A Beichman,G Bryden,Sean J Carey, M M Fausnaugh,B S Gaudi,Andrew Gould,C Henderson,Richard W Pogge, B Wibking, J C Yee, Weizhong Zhu,F Abe,Y Asakura, R K Barry,D P Bennett,A Bhattacharya, M Donachie,Mark A Freeman,Atsushi Fukui, Yasukazu Hirao,K Inayama,Y Itow,N Koshimoto,M C A Li,C H Ling,Kimiaki Masuda,Y Matsubara,Y Muraki, M Nagakane,Takaaki Nishioka,K Ohnishi, H Oyokawa,N J Rattenbury,To Saito,Ashwini Sharan,D J Sullivan,T Sumi, David T Suzuki,P J Tristram,Y Wakiyama,Atsunori Yonehara,Jae Young Choi,Hyangkyu Park,Y K Jung,I G Shin,M D Albrow,B G Park,S L Kim,C U Lee, S M Cha,Dong Jin Kim, Yongwha Lee,M Dominik,U G Jorgensen,Michael I Andersen,D M Bramich,Martin J Burgdorf,S Ciceri, G Dago,David 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,Jean Surdej,E Undasanzana,C Von Essen,Y B Wang,O Wertz,Dan Maoz,M Friedmann

ASTROPHYSICAL JOURNAL（2016）

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摘要

Spitzer microlensing parallax observations of OGLE-2015-BLG-1212 decisively break. 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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关键词

binaries: general,Galaxy: bulge,gravitational lensing: micro,planets and satellites: detection,space vehicles

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