1. MASS MEASUREMENTS of ISOLATED OBJECTS from SPACE-BASED MICROLENSING
- Author
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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, Wertz, O, TEAM, S, OGLE, GRP, KMTNET, GRP, WISE, GRP, TEAM, R, MINDSTEP, GRP, Science & Technology Facilities Council, and University of St Andrews. School of Physics and Astronomy
- Subjects
Star (game theory) ,PROPER MOTIONS ,GRAVITATIONAL LENSING EXPERIMENT ,Brown dwarf ,NDAS ,FOS: Physical sciences ,Astrophysics ,gravitational lensing: micro ,GALACTIC BULGE ,Gravitational microlensing ,Space (mathematics) ,brown dwarfs ,stars: fundamental parameters ,Astronomy and Astrophysics ,Space and Planetary Science ,01 natural sciences ,fundamental parameters [Stars] ,law.invention ,micro [Gravitational lensing] ,EVENTS ,Settore FIS/05 - Astronomia e Astrofisica ,PLANET SENSITIVITY ,SYSTEMS ,law ,Bulge ,0103 physical sciences ,QB Astronomy ,QD ,010303 astronomy & astrophysics ,Red clump ,Solar and Stellar Astrophysics (astro-ph.SR) ,QC ,QB ,Earth and Planetary Astrophysics (astro-ph.EP) ,Physics ,Brown dwarfs ,010308 nuclear & particles physics ,OGLE-III ,Lens (optics) ,QC Physics ,Astrophysics - Solar and Stellar Astrophysics ,Parallax ,PARALLAX SATELLITE MASS ,SPITZER OBSERVATIONS ,STARS ,Astrophysics - Earth and Planetary Astrophysics - 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., Comment: 10 papers, 4 figures, 2 tables; ApJ in press
- Published
- 2016