OGLE-2015-BLG-0479LA,B: BINARY GRAVITATIONAL MICROLENS CHARACTERIZED by SIMULTANEOUS GROUND-BASED and SPACE-BASED OBSERVATIONS
- Han, C.
- Udalski, A.
- Gould, A.
- Zhu, W.
- Street, R. A.
- Yee, J. C.
- Beichman, C.
- Bryden, C.
- Novati, S. C.
- Carey, S.
- Fausnaugh, M.
- Gaudi, B. S.
- Henderson, C. B.
- Shvartzvald, Y.
- Wibking, B.
- Szymański, M. K.
- Soszyński, I.
- Skowron, J.
- Mróz, P.
- Poleski, R.
- Pietrukowicz, P.
- Kozłowski, S.
- Ulaczyk, K.
- Wyrzykowski, Ł.
- Pawlak, M.
- Tsapras, Y.
- Hundertmark, M.
- Bachelet, E.
- Dominik, M.
- Bramich, D. M.
- Cassan, A.
- Jaimes, R. F.
- Horne, K.
- Ranc, C.
- Schmidt, R.
- Snodgrass, C.
- Wambsganss, J.
- Steele, I. A.
- Menzies, J.
- Mao, S.
- Bozza, V.
- Jørgensen, U. G.
- Alsubai, K. A.
- Ciceri, S.
- D'Ago, G.
- Haugbølle, T.
- Hessman, F. V.
- Hinse, T. C.
- Juncher, D.
- Korhonen, H.
- Mancini, L.
- Popovas, A.
- Rabus, M.
- Rahvar, S.
- Scarpetta, G.
- Skottfelt, J.
- Southworth, J.
- Starkey, D.
- Surdej, Jean
- Wertz, O.
- Zarucki, M.
- Pogge, R. W.
- DePoy, D. L.
DOIAbstract
peer reviewedWe present a combined analysis of the observations of the gravitational microlensing event OGLE-2015-BLG-0479 taken both from the ground and by the Spitzer Space Telescope. The light curves seen from the ground and from space exhibit a time offset of ∼13 days between the caustic spikes, indicating that the relative lens-source positions seen from the two places are displaced by parallax effects. From modeling the light curves, we measure the space-based microlens parallax. Combined with the angular Einstein radius measured by analyzing the caustic crossings, we determine the mass and distance of the lens. We find that the lens is a binary composed of two G-type stars with masses of ∼1.0 M⊙ and ∼0.9 M⊙ located at a distance of ∼...
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