Mass Measurements of Isolated Objects from Space-based Microlensing

Wei Zhu , S. Calchi Novati , A. Gould , A. Udalski , C. Han , Y. Shvartzvald , C. Ranc , U.G. Jorgensen

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R. Poleski V. Bozza C. Beichman G. Bryden S. Carey B.S. Gaudi C.B. Henderson R.W. Pogge I. Porritt B. Wibking J.C. Yee M. Pawlak M.K. Szymanski J. Skowron P. Mroz S. Kozlowski L. Wyrzykowski P. Pietrukowicz G. Pietrzynski I. Soszynski K. Ulaczyk J.Y. Choi H. Park Y.K. Jung I.-G. Shin M.D. Albrow B.-G. Park S.-L. Kim C.-U. Lee D.-J. Kim Y. Lee M. Friedmann S. Kaspi D. Maoz M. Hundertmark R.A. Street Y. Tsapras D.M. Bramich A. Cassan M. Dominik E. Bachelet Subo Dong R. Figuera Jaimes K. Horne S. Mao J. Menzies R. Schmidt C. Snodgrass I.A. Steele J. Wambsganss J. Skottfelt M.I. Andersen M.J. Burgdorf S. Ciceri G. D'Ago D.F. Evans S.-H. Gu T.C. Hinse E. Kerins H. Korhonen M. Kuffmeier L. Mancini N. Peixinho A. Popovas M. Rabus S. Rahvar R.T. Rasmussen G. Scarpetta J. Southworth J. Surdej C. von Essen Y.-B. Wang O. Wertz

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classification 🌌 astro-ph.SR astro-ph.EP

keywords lensmassmeasurementsbrowndwarffindisolatedmicrolensing

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We report on the mass and distance measurements of two single-lens events from the 2015 \emph{Spitzer} microlensing campaign. With both finite-source effect and microlens parallax measurements, we find that the lens of OGLE-2015-BLG-1268 is very likely a brown dwarf. Assuming that the source star lies behind the same amount of dust as the Bulge red clump, we find the lens is a $45\pm7$ $M_{\rm J}$ brown dwarf at $5.9\pm1.0$ kpc. The lens of of the second event, OGLE-2015-BLG-0763, is a $0.50\pm0.04$ $M_\odot$ star at $6.9\pm1.0$ kpc. We show that the probability to definitively measure the mass of isolated microlenses is dramatically increased once simultaneous ground- and space-based observations are conducted.

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Mass Measurements of Isolated Objects from Space-based Microlensing

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