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Zhu, W, Novati, SC, Gould, A, Udalski, A, Han, C, Shvartzvald, Y, Ranc, C, Jorgensen, UG, Poleski, R, Bozza, V, Beichman, C, Bryden, G, Carey, S, Gaudi, BS, Henderson, CB, Pogge, RW, Porritt, I, Wibking, B, Yee, JC, Pawlak, M , Szymanski, MK, Skowron, J, Mroz, P, Kozlowski, S, Wyrzykowski, L, Pietrukowicz, P, Pietrzynski, G, Soszynski, I, Ulaczyk, K, Choi, J-Y, Park, H, Jung, YK, Shin, I-G, Albrow, MD, Park, B-G, Kim, S-L, Lee, C-U, Cha, S-M, Kim, D-J, Lee, Y, Friedmann, M, Kaspi, S, Maoz, D, Hundertmark, M, Street, RA, Tsapras, Y, Bramich, DM, Cassan, A, Dominik, M, Bachelet, E, Dong, S, Jaimes, RF, Horne, K, Mao, S, Menzies, J, Schmidt, R, Snodgrass, C, Steele, IA, Wambsganss, J, Skottfelt, J, Andersen, MI, Burgdorf, MJ, Ciceri, S, D'Ago, G, Evans, DF, Gu, S-H, Hinse, TC, 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 and Wertz, O (2016) MASS MEASUREMENTS OF ISOLATED OBJECTS FROM SPACE-BASED MICROLENSING. ASTROPHYSICAL JOURNAL, 825 (1). ISSN 0004-637X

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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 behind the same amount of dust as the Bulge red clump, we find the lens is a 45±7 MJ 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.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences, 0305 Organic Chemistry, 0306 Physical Chemistry (Incl. Structural)
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Astrophysics Research Institute
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Date Deposited: 07 Oct 2016 09:05
Last Modified: 02 Aug 2022 14:27
DOI or ID number: 10.3847/0004-637X/825/1/60
URI: https://researchonline.ljmu.ac.uk/id/eprint/4263
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