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OGLE-2017-BLG-0329L: A Microlensing Binary Characterized with Dramatically Enhanced Precision Using Data from Space-based Observations

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cris.lastimport.scopus2024-02-12T19:29:14Z
dc.abstract.enMass measurements of gravitational microlenses require one to determine the microlens parallax π <SUB>E</SUB>, but precise π <SUB>E</SUB> 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 π <SUB>E</SUB> 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-π <SUB>E</SUB> 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 well-known 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 {{\boldsymbol{π }}}<SUB>{{E</SUB>}} 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 (M <SUB>1</SUB>, M <SUB>2</SUB>) ˜ (1.1, 0.8) M <SUB>⊙</SUB> or ˜(0.4, 0.3) M <SUB>⊙</SUB> 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.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorUdalski, Andrzej
dc.contributor.authorPietrukowicz, Paweł
dc.contributor.authorSkowron, Jan
dc.contributor.authorSzymański, Michał
dc.contributor.authorSoszyński, Igor
dc.contributor.authorKozłowski, Szymon
dc.contributor.authorHan, C.
dc.contributor.authorNovati, S. Calchi
dc.contributor.authorLee, C. -U.
dc.contributor.authorGould, A.
dc.contributor.authorBozza, V.
dc.contributor.authorMróz, Przemysław
dc.contributor.authorPoleski, Radosław
dc.contributor.authorUlaczyk, Krzysztof
dc.contributor.authorPawlak, Michał
dc.contributor.authorRybicki, Krzysztof
dc.contributor.authorIwanek, Patryk
dc.contributor.authorAlbrow, M. D.
dc.contributor.authorChung, S. -J.
dc.contributor.authorHwang, K. -H.
dc.contributor.authorJung, Y. K.
dc.contributor.authorRyu, Y. -H.
dc.contributor.authorShin, I. -G.
dc.contributor.authorShvartzvald, Y.
dc.contributor.authorYee, J. C.
dc.contributor.authorZang, W.
dc.contributor.authorZhu, W.
dc.contributor.authorCha, S. -M.
dc.contributor.authorKim, D. -J.
dc.contributor.authorKim, H. -W.
dc.contributor.authorKim, S. -L.
dc.contributor.authorLee, D. -J.
dc.contributor.authorLee, Y.
dc.contributor.authorPark, B. -G.
dc.contributor.authorPogge, R. W.
dc.contributor.authorKim, W. -T.
dc.contributor.authorBeichman, C.
dc.contributor.authorBryden, G.
dc.contributor.authorCarey, S.
dc.contributor.authorGaudi, B. S.
dc.contributor.authorHenderson, C. B.
dc.contributor.authorDominik, M.
dc.contributor.authorHelling, C.
dc.contributor.authorHundertmark, M.
dc.contributor.authorJørgensen, U. G.
dc.contributor.authorLonga-Peña, P.
dc.contributor.authorLowry, S.
dc.contributor.authorSajadian, S.
dc.contributor.authorBurgdorf, M. J.
dc.contributor.authorCampbell-White, J.
dc.contributor.authorCiceri, S.
dc.contributor.authorEvans, D. F.
dc.contributor.authorHaikala, L. K.
dc.contributor.authorHinse, T. C.
dc.contributor.authorRahvar, S.
dc.contributor.authorRabus, M.
dc.contributor.authorSnodgrass, C.
dc.date.accessioned2024-01-25T15:41:04Z
dc.date.available2024-01-25T15:41:04Z
dc.date.copyright2018-02-27
dc.date.issued2018
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financeNie dotyczy
dc.description.number2
dc.description.versionORIGINAL_AUTHOR
dc.description.volume859
dc.identifier.doi10.3847/1538-4357/AABD87
dc.identifier.issn0004-637X
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/114510
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2018ApJ...859...82H
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstrophysical Journal
dc.relation.pages82
dc.rightsOther
dc.sciencecloudnosend
dc.titleOGLE-2017-BLG-0329L: A Microlensing Binary Characterized with Dramatically Enhanced Precision Using Data from Space-based Observations
dc.typeJournalArticle
dspace.entity.typePublication