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MASS MEASUREMENTS OF ISOLATED OBJECTS FROM SPACE-BASED MICROLENSING

Zhu, W and Novati, SC and Gould, A and Udalski, A and Han, C and Shvartzvald, Y and Ranc, C and Jorgensen, UG and Poleski, R and Bozza, V and Beichman, C and Bryden, G and Carey, S and Gaudi, BS and Henderson, CB and Pogge, RW and Porritt, I and Wibking, B and Yee, JC and Pawlak, M and Szymanski, MK and Skowron, J and Mroz, P and Kozlowski, S and Wyrzykowski, L and Pietrukowicz, P and Pietrzynski, G and Soszynski, I and Ulaczyk, K and Choi, J-Y and Park, H and Jung, YK and Shin, I-G and Albrow, MD and Park, B-G and Kim, S-L and Lee, C-U and Cha, S-M and Kim, D-J and Lee, Y and Friedmann, M and Kaspi, S and Maoz, D and Hundertmark, M and Street, RA and Tsapras, Y and Bramich, DM and Cassan, A and Dominik, M and Bachelet, E and Dong, S and Jaimes, RF and Horne, K and Mao, S and Menzies, J and Schmidt, R and Snodgrass, C and Steele, IA and Wambsganss, J and Skottfelt, J and Andersen, MI and Burgdorf, MJ and Ciceri, S and D'Ago, G and Evans, DF and Gu, S-H and Hinse, TC and Kerins, E and Korhonen, H and Kuffmeier, M and Mancini, L and Peixinho, N and Popovas, A and Rabus, M and Rahvar, S and Tronsgaard, R and Scarpetta, G and Southworth, J and Surdej, J and von Essen, C and 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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Abstract

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
Publisher: IOP PUBLISHING LTD
Related URLs:
Date Deposited: 07 Oct 2016 09:05
Last Modified: 08 Sep 2017 03:40
DOI or Identification number: 10.3847/0004-637X/825/1/60
URI: http://researchonline.ljmu.ac.uk/id/eprint/4263

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