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; 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

doi:10.3847/0004-637X/825/1/60

Mass Measurements of Isolated Objects from Space-based Microlensing

Solar and Stellar Astrophysics 2016-07-06 v2 Earth and Planetary Astrophysics

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

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.

Keywords

gravitational microlensing

Cite

@article{arxiv.1510.02097,
  title  = {Mass Measurements of Isolated Objects from Space-based Microlensing},
  author = {Wei Zhu and S. Calchi Novati and A. Gould and A. Udalski and C. Han and Y. Shvartzvald and C. Ranc and U. G. Jorgensen and R. Poleski and V. Bozza and C. Beichman and G. Bryden and S. Carey and B. S. Gaudi and C. B. Henderson and R. W. Pogge and I. Porritt and B. Wibking and J. C. Yee and M. Pawlak and M. K. Szymanski and J. Skowron and P. Mroz and S. Kozlowski and L. Wyrzykowski and P. Pietrukowicz and G. Pietrzynski and I. Soszynski and K. Ulaczyk and J. Y. Choi and H. Park and Y. K. Jung and I. -G. Shin and M. D. Albrow and B. -G. Park and S. -L. Kim and C. -U. Lee and D. -J. Kim and Y. Lee and M. Friedmann and S. Kaspi and D. Maoz and M. Hundertmark and R. A. Street and Y. Tsapras and D. M. Bramich and A. Cassan and M. Dominik and E. Bachelet and Subo Dong and R. Figuera Jaimes and K. Horne and S. Mao and J. Menzies and R. Schmidt and C. Snodgrass and I. A. Steele and J. Wambsganss and J. Skottfelt and M. I. Andersen and M. J. Burgdorf and S. Ciceri and G. D'Ago and D. F. Evans and S. -H. Gu and T. C. Hinse and E. Kerins and H. Korhonen and M. Kuffmeier and L. Mancini and N. Peixinho and A. popovas and M. Rabus and S. Rahvar and R. T. Rasmussen and G. Scarpetta and J. Southworth and J. Surdej and C. von Essen and Y. -B. Wang and O. Wertz},
  journal= {arXiv preprint arXiv:1510.02097},
  year   = {2016}
}

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10 papers, 4 figures, 2 tables; ApJ in press

Mass Measurements of Isolated Objects from Space-based Microlensing

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