Year: 2014
Type: article
Abstract: The mass of the lenses giving rise to Galactic microlensing events can be constrained by measuring the relative lens-source proper motion and lens flux. The flux of the lens can be separated from that of the source, companions to the source, and unrelated nearby stars with high-resolution images taken when the lens and source are spatially resolved. For typical ground-based adaptive optics (AO) or space-based observations, this requires either inordinately long time baselines or high relative proper motions. We provide a list of microlensing events toward the Galactic bulge with high relative lens-source proper motion that are therefore good candidates for constraining the lens mass with future high-resolution imaging. We investigate all events from 2004 to 2013 that display detectable finite-source effects, a feature that allows us to measure the proper motion. In total, we present 20 events with μ ≳ 8 mas yr −1 . Of these, 14 were culled from previous analyses while 6 are new, including OGLE-2004-BLG-368, MOA-2005-BLG-36, OGLE-2012-BLG-0211, OGLE-2012-BLG-0456, MOA-2012-BLG-532, and MOA-2013-BLG-029. In ≲12 yr from the time of each event the lens and source of each event will be sufficiently separated for ground-based telescopes with AO systems or space telescopes to resolve each component and further characterize the lens system. Furthermore, for the most recent events, comparison of the lens flux estimates from images taken immediately to those estimated from images taken when the lens and source are resolved can be used to empirically check the robustness of the single-epoch method currently being used to estimate lens masses for many events.
Source: The Astrophysical Journal
Authors: C. B. Henderson, H. Park, T. Sumi, A. Udalski, A. Gould, Y. Tsapras, C. Han, B. S. Gaudi, V. Bozza, F. Abe, D. P. Bennett, I. A. Bond, C. S. Botzler, M. Freeman, A. Fukui, D. Fukunaga, Y. Itow, N. Koshimoto, C. H. Ling, K. Masuda, Y. Matsubara, Y. Muraki, S. Namba, K. Ohnishi, N. J. Rattenbury, To Saito, D. J. Sullivan, D. Suzuki, W. L. Sweatman, P. J. Tristram, N. Tsurumi, K. Wada, N. Yamai, P. C. M. Yock, A. Yonehara, M. K. Szymański, M. Kubiak, G. Pietrzyński, I. Soszyński, J. Skowron, S. Kozłowski, R. Poleski, K. Ulaczyk, Ł. Wyrzykowski, P. Pietrukowicz, L. A. Almeida, M. Bos, J.-Y. Choi, G. W. Christie, D. L. Depoy, S. Dong, M. Friedmann, K.-H. Hwang, F. Jablonski, Y. K. Jung, S. Kaspi, C.-U. Lee, D. Maoz, J. McCormick, D. Moorhouse, T. Natusch, H. Ngan, R. W. Pogge, I.-G. Shin, Y. Shvartzvald, T.-G. Tan, G. Thornley, J. C. Yee, A. Allan, D. M. Bramich, P. Browne, M. Dominik, K. Horne, M. Hundertmark, R. Figuera Jaimes, N. Kains, C. Snodgrass, I. A. Steele, R. A. Street
Institutions: The Ohio State University, Chungbuk National University, The University of Osaka, University of Warsaw, Las Cumbres Observatory Global Telescope Network, Queen Mary University of London, University of Salerno, Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, Nagoya University, University of Notre Dame, Massey University, University of Auckland, Victoria University of Wellington, National Astronomical Observatory of Japan, National Institute of Technology, Nagano College, Kyoto Sangyo University, University of Concepción, University of Cambridge, Universidade de São Paulo, Instituto Nacional de Pesquisas Espaciais, Stardome Observatory, Texas A&M University, Peking University, Tel Aviv University, Korea Astronomy and Space Science Institute, Farm Cove Observatory, Kumeu Observatory, Auckland University of Technology, Perth Exoplanet Survey Telescope Observatory, Center for Astrophysics Harvard & Smithsonian, University of Exeter, Qatar Foundation, University of St Andrews, European Southern Observatory, Max Planck Institute for Solar System Research, Liverpool John Moores University
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Funders: National Science Foundation, National Aeronautics and Space Administration, California Institute of Technology, Qatar Foundation, National Research Foundation, Fonds National de la Recherche Luxembourg, Chinese Academy of Sciences, National Research Foundation of Korea, Qatar National Research Fund, Science and Technology Facilities Council, Japan Society for the Promotion of Science, FP7 Ideas: European Research Council
Awards: Optical Gravitational Lensing Experiment: New Frontiers in Observational Astronomy, Astrophysics at St Andrews: 2012-2014, Search for free-floating planets by using gravitational microlensing, Microlensing Theory and Planet Detection: Bridge to the Future, Astrophysics Research at Liverpool John Moores University, G4104599821, Astronomy and Planetary Sciences at the Open University (APSOU), WE PROPOSE TO CONTINUE OUR SUCCESSFUL PROGRAM OF PLANET DISCOVERY USING THE GRAVITAIONAL MICROLENSING TECHNIQUE. OUR WORK WILL SPECIFICALLY FOCUS ON, 重力マイクロレンズによる地球質量系外惑星、浮遊惑星の探索, G7024351342, G739158838, Graduate Research Fellowship Program, LT Operations Extension April - September 2014, Liverpool Telescope Operations 2014-2016, G8476363046, Postdoctoral program in theoretical and observational astrophysics, G988696487
OpenAlex ID: W2113129697