Han, C., Novati, S. Calchi, Udalski, A., Lee, C.-U., Gould, A., Bozza, V., Mróz, P., Pietrukowicz, P., Skowron, J., Szymański, M. K., and others. (2018) OGLE-2017-BLG-0329L: A Microlensing Binary Characterized with Dramatically Enhanced Precision Using Data from Space-based Observations. The Astrophysical Journal, 859 (2). Article Number 82. ISSN 1538-4357. (doi:10.3847/1538-4357/aabd87) (KAR id:74004)
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| Official URL: https://doi.org/10.3847/1538-4357/aabd87 |
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| Resource title: | OGLE-2017-BLG-0329L: A Microlensing Binary Characterized with Dramatically Enhanced Precision Using Data from Space-based Observations |
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| Resource type: | ["eprint_fieldopt_related_resource_type_" not defined] |
| : | arXiv:1802.10196 |
| KDR/KAR URL: | |
| External URL: | https://arxiv.org/abs/1802.10196 |
Abstract
Mass measurements of gravitational microlenses require one to determine the microlens parallax πE, but precise πE measurement, in many cases, is hampered due to the subtlety of the microlens-parallax signal combined with the difficulty of distinguishing the signal from those induced by other higher-order effects. In this work, we present the analysis of the binary-lens event OGLE-2017-BLG-0329, for which πE is measured with a dramatically improved precision using additional data from space-based Spitzer observations. We find that while the parallax model based on the ground-based data cannot be distinguished from a zero-πE model at the 2σ level, the addition of the Spitzer data enables us to identify two classes of solutions, each composed of a pair of solutions according to the wellknown ecliptic degeneracy. It is found that the space-based data reduce the measurement uncertainties of the north and east components of the microlens-parallax vector pE by factors ∼18 and ∼4, respectively. With the measured microlens parallax combined with the angular Einstein radius measured from the resolved caustic crossings, we find that the lens is composed of a binary with component masses of either (M1, M2) ∼ (1.1, 0.8) Me or ∼(0.4, 0.3) Me according to the two solution classes. The first solution is significantly favored but the second cannot be securely ruled out based on the microlensing data alone. However, the degeneracy can be resolved from adaptive optics observations taken ∼10 years after the event.
| Item Type: | Article |
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| DOI/Identification number: | 10.3847/1538-4357/aabd87 |
| Uncontrolled keywords: | binaries: general – gravitational lensing: micro |
| Subjects: | Q Science > QB Astronomy > QB460 Astrophysics |
| Divisions: | Divisions > Division of Natural Sciences > Physics and Astronomy |
| Depositing User: | Stephen Lowry |
| Date Deposited: | 21 May 2019 09:50 UTC |
| Last Modified: | 05 Nov 2024 12:37 UTC |
| Resource URI: | https://kar.kent.ac.uk/id/eprint/74004 (The current URI for this page, for reference purposes) |
University of Kent Author Information
Lowry, S.C..
| Creator's ORCID: |
 https://orcid.org/0000-0002-5605-4329
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| CReDIT Contributor Roles: |
Campbell-White, J..
| Creator's ORCID: |
https://orcid.org/0000-0002-3913-3746
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|---|---|
| CReDIT Contributor Roles: |
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