The Open UniversitySkip to content
 

Mass Measurements of Isolated Objects from Space-Based Microlensing

Zhu (祝伟), Wei; Novati, S. Calchi; Gould, A.; Udalski, A.; Han, C.; Shvartzvald, Y.; Ranc, C.; Jørgensen, 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.; Pawlak, M.; Szymański, M. K.; Skowron, J.; Mróz, P.; Kozłowski, S.; Wyrzykowski, Ł.; Pietrukowicz, P.; Pietrzyński, G.; Soszyński, I.; Ulaczyk, K.; 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.; Friedmann, M.; Kaspi, S.; Maoz, D.; Hundertmark, M.; Street, R. A.; Tsapras, Y.; Bramich, D. M.; Cassan, A.; Dominik, M.; Bachelet, E.; Dong, Subo; Jaimes, R. Figuera; Horne, K.; Mao, S.; Menzies, J.; Schmidt, R.; Snodgrass, Colin; Steele, I. A.; Wambsganss, J.; Skottfelt, Jesper; 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.; Essen, C. von; Wang, Y.-B. and Wertz, O. (2016). Mass Measurements of Isolated Objects from Space-Based Microlensing. The Astrophysical Journal, 825(1) p. 60.

DOI (Digital Object Identifier) Link: https://doi.org/10.3847/0004-637X/825/1/60
Google Scholar: Look up in Google Scholar

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: Journal Item
Copyright Holders: 2016 The American Astronomical Society
ISSN: 1538-4357
Keywords: brown dwarfs; gravitational lensing: micro; stars: fundamental parameters
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Centre for Electronic Imaging (CEI)
Space
Item ID: 46851
Depositing User: Jesper Skottfelt
Date Deposited: 21 Jul 2016 09:36
Last Modified: 07 Dec 2018 10:42
URI: http://oro.open.ac.uk/id/eprint/46851
Share this page:

Metrics

Altmetrics from Altmetric

Citations from Dimensions

Actions (login may be required)

Policies | Disclaimer

© The Open University   contact the OU