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2016ApJ...825...60Z - Astrophys. J., 825, 60-60 (2016/July-1)

Mass measurements of isolated objects from space-based microlensing.

ZHU W., CALCHI NOVATI S., GOULD A., UDALSKI A., HAN C., SHVARTZVALD Y., RANC C., JORGENSEN U.G., POLESKI R., BOZZA V., BEICHMAN C., BRYDEN G., CAREY S., GAUDI B.S., HENDERSON C.B., POGGE R.W., PORRITT I., WIBKING B., YEE J.C. (The Spitzer Team), PAWLAK M., SZYMANSKI M.K., SKOWRON J., MROZ P., KOZLOWSKI S., WYRZYKOWSKI L., PIETRUKOWICZ P., PIETRZYNSKI G., SOSZYNSKI I., ULACZYK K. (The OGLE Group), CHOI J.-Y., PARK H., JUNG Y.K., SHIN I.-G., ALBROW M.D., PARK B.-G., KIM S.-L., LEE C.-U., CHA S.-M., KIM D.-J., LEE Y. (The KMTNet Group), FRIEDMANN M., KASPI S., MAOZ D. (The WISE Group), HUNDERTMARK M., STREET R.A., TSAPRAS Y., BRAMICH D.M., CASSAN A., DOMINIK M., BACHELET E., DONG S., FIGUERA JAIMES R., HORNE K., MAO S., MENZIES J., SCHMIDT R., SNODGRASS C., STEELE I.A., WAMBSGANSS J. (The RoboNet Team), SKOTTFELT J., ANDERSEN M.I., BURGDORF M.J., CICERI S., D'AGO G., EVANS D.F., GU S.-H., HINSE T.C., KERINS E., KORHONEN H., KUFFMEIER M., MANCINI L., PEIXINHO N., POPOVAS A., RABUS M., RAHVAR S., TRONSGAARD R., SCARPETTA G., SOUTHWORTH J., SURDEJ J., VON ESSEN C., WANG Y.-B., WERTZ O. (The MiNDSTEp Group)

Abstract (from CDS):

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 {M}_{J} BD at 5.9±1.0 kpc. The lens of of the second event, OGLE-2015-BLG-0763, is a 0.50±0.04 {M}_☉ 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.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): brown dwarfs - gravitational lensing: micro - stars: fundamental parameters

Simbad objects: 7

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