Spitzer as a microlens parallax satellite : mass and distance measurements of the binary lens system OGLE-2014-BLG-1050L
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We report the first mass and distance measurements of a caustic-crossing binary system OGLE-2014-BLG-1050 L using the space-based microlens parallax method. Spitzer captured the second caustic crossing of the event, which occurred ~10 days before that seen from Earth. Due to the coincidence that the source-lens relative motion was almost parallel to the direction of the binary-lens axis, the fourfold degeneracy, which was known before only to occur in single-lens events, persists in this case, leading to either a lower-mass (0.2 and 0.07 MΘ) binary at ~1.1 kpc or a higher-mass (0.9 and 0.35 MΘ) binary at ~3.5 kpc. However, the latter solution is strongly preferred for reasons including blending and lensing probability. OGLE-2014-BLG-1050 L demonstrates the power of microlens parallax in probing stellar and substellar binaries.
Zhu , W , Udalski , A , Gould , A , Dominik , M , Bozza , V , Han , C , Yee , J C , Calchi Novati , S , Beichman , C A , Carey , S , Poleski , R , Skowron , J , Kozłowski , S , Mróz , P , Pietrukowicz , P , Pietrzyński , G , Szymański , M K , Soszyński , I , Ulaczyk , K , Wyrzykowski , Ł , Gaudi , B S , Pogge , R W , DePoy , D L , Jung , Y K , Choi , J-Y , Hwang , K-H , Shin , I-G , Park , H & Jeong , J 2015 , ' Spitzer as a microlens parallax satellite : mass and distance measurements of the binary lens system OGLE-2014-BLG-1050L ' Astrophysical Journal , vol. 805 , no. 1 . DOI: 10.1088/0004-637X/805/1/8
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