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Mass measurements of isolated objects from space-based microlensing

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We report on the mass and distance measurements of two single-lens events from the 2015 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 (BD). Assuming that the source star lies...

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Bibliographic Details
Main Authors: Zhu, Wei (Author) , Hundertmark, Markus (Author) , Tsapras, Yiannis (Author) , Schmidt, Robert W. (Author) , Wambsganß, Joachim (Author)
Format: Article (Journal)
Language:English
Published: 2016 July 1
In: The astrophysical journal
Year: 2016, Volume: 825, Issue: 1
ISSN:1538-4357
DOI:10.3847/0004-637X/825/1/60
Online Access:Verlag, kostenfrei, Volltext: http://dx.doi.org/10.3847/0004-637X/825/1/60
Verlag, kostenfrei, Volltext: http://stacks.iop.org/0004-637X/825/i=1/a=60
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Author Notes:Wei Zhu (祝伟), S. Calchi Novati, A. Gould, A. Udalski, C. Han, Y. Shvartzvald, C. Ranc, U.G. Jørgensen, 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, SPITZER TEAM, M. Pawlak, M.K. Szymański, J. Skowron, P. Mróz, S. Kozłowski, Ł Wyrzykowski, P. Pietrukowicz, G. Pietrzyński, I. Soszyński, K. Ulaczyk, OGLE GROUP, J.-Y. Choi, H. Park, Y. K. Jung, I.-G. Shin, M.D. Albrow, B.-G. Park, S.-L. Kim, C.-U. Lee, S.-M. Cha, D.-J. Kim, Y. Lee, KMTNET GROUP, M. Friedmann, S. Kaspi, D. Maoz, WISE GROUP, 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, ROBONET TEAM, 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. Tronsgaard, G. Scarpetta, J. Southworth, J. Surdej, C. von Essen, Y.-B. Wang, and O. Wertz, MINDSTEP GROUP
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Summary:We report on the mass and distance measurements of two single-lens events from the 2015 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 (BD). Assuming that the source star lies behind the same amount of dust as the Bulge red clump, we find the lens is a 45 ± 7 ##IMG## [http://ej.iop.org/images/0004-637X/825/1/60/apjaa2256ieqn1.gif] $M_\rmJ$ BD at 5.9 ± 1.0 kpc. The lens of of the second event, OGLE-2015-BLG-0763, is a 0.50 ± 0.04 ##IMG## [http://ej.iop.org/images/0004-637X/825/1/60/apjaa2256ieqn2.gif] $M_ødot $ star at 6.9 ± 1.0 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.
Item Description:Gesehen am 23.08.2017
Physical Description:Online Resource
ISSN:1538-4357
DOI:10.3847/0004-637X/825/1/60

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