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Pregled bibliografske jedinice broj: 502487

Časopis

Autori: Skowron, Jan; ...; Dominis Prester, Dijana; ...; Zub, M.
Naslov: Binary microlensing event OGLE-2009-BLG-020 gives a verifiable mass, distance and orbit predictions
Izvornik: The Astrophysical journal (0004-637X) 738 (2011), 1; 87-138
Vrsta rada: članak
Ključne riječi: Galaxy: bulge – gravitational lensing – stars: binary
Sažetak:
We present the first example of binary microlensing for which the parameter measurements can be verified (or contradicted) by future Doppler observations. This test is made possible by a confluence of two relatively unusual circumstances. First, the binary lens is bright enough (I=15.6) to permit Doppler measurements. Second, we measure not only the usual 7 binary-lens parameters, but also the 'microlens parallax' (which yields the binary mass) and two components of the instantaneous orbital velocity. Thus we measure, effectively, 6 'Kepler+1' parameters (two instantaneous positions, two instantaneous velocities, the binary total mass, and the mass ratio). Since Doppler observations of the brighter binary component determine 5 Kepler parameters (period, velocity amplitude, eccentricity, phase, and position of periapsis), while the same spectroscopy yields the mass of the primary, the combined Doppler + microlensing observations would be overconstrained by 6 + (5 + 1) - (7 + 1) = 4 degrees of freedom. This makes possible an extremely strong test of the microlensing solution. We also introduce a uniform microlensing notation for single and binary lenses, we define conventions, summarize all known microlensing degeneracies and extend a set of parameters to describe full Keplerian motion of the binary lenses.
Projekt / tema: 316-0000000-2824
Izvorni jezik: ENG
Rad je indeksiran u
bazama podataka:
Current Contents Connect (CCC)
Scopus
SCI-EXP, SSCI i/ili A&HCI
Science Citation Index Expanded (SCI-EXP) (sastavni dio Web of Science Core Collectiona)
Kategorija: Znanstveni
Znanstvena područja:
Fizika
URL Internet adrese: http://iopscience.iop.org/0004-637X/738/1/87
Broj citata:
Altmetric:
DOI: 10.1088/0004-637X/738/1/87
URL cjelovitog teksta:
Google Scholar: Binary microlensing event OGLE-2009-BLG-020 gives a verifiable mass, distance and orbit predictions
Upisao u CROSBI: dijana@uniri.hr (dijana@uniri.hr), 15. Vel. 2011. u 21:12 sati
Napomene:
The PLANET Collaboration



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