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Pregled bibliografske jedinice broj: 619096

Časopis

Autori: Miyake, N; ...; Dominis Prester, Dijana; ...; ...; Zub, M.
Naslov: A Possible Binary System of a Stellar Remnant in the High-magnification Gravitational Microlensing Event OGLE-2007-BLG-514
Izvornik: The Astrophysical journal (0004-637X) 752 (2012), 2; 82-1-82-12
Vrsta rada: članak
Ključne riječi: binaries: general; Galaxy: bulge; gravitational lensing: micro
Sažetak:
We report the extremely high-magnification (A > 1000) binary microlensing event OGLE-2007-BLG-514. We obtained good coverage around the double peak structure in the light curve via follow-up observations from different observatories. The binary lens model that includes the effects of parallax (known orbital motion of the Earth) and orbital motion of the lens yields a binary lens mass ratio of q = 0.321 ± 0.007 and a projected separation of s = 0.072 ± 0.001 in units of the Einstein radius. The parallax parameters allow us to determine the lens distance DL = 3.11 ± 0.39 kpc and total mass ML = 1.40 ± 0.18 M sun this leads to the primary and secondary components having masses of M 1 = 1.06 ± 0.13 M sun and M 2 = 0.34 ± 0.04 M sun, respectively. The parallax model indicates that the binary lens system is likely constructed by the main-sequence stars. On the other hand, we used a Bayesian analysis to estimate probability distributions by the model that includes the effects of xallarap (possible orbital motion of the source around a companion) and parallax (q = 0.270 ± 0.005, s = 0.083 ± 0.001). The primary component of the binary lens is relatively massive, with M 1 = 0.9+4.6 -0.3 M sun and it is at a distance of D L = 2.6+3.8 -0.9 kpc. Given the secure mass ratio measurement, the companion mass is therefore M 2 = 0.2+1.2 -0.1 M sun. The xallarap model implies that the primary lens is likely a stellar remnant, such as a white dwarf, a neutron star, or a black hole.
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/752/2/82/article
Broj citata:
Altmetric:
DOI: 10.1088/0004-637X/752/2/82
URL cjelovitog teksta:
Google Scholar: A Possible Binary System of a Stellar Remnant in the High-magnification Gravitational Microlensing Event OGLE-2007-BLG-514
Upisao u CROSBI: Dijana Dominis Prester (dijana@phy.uniri.hr), 20. Vel. 2013. u 14:20 sati
Napomene:
The PLANET Collaboration.



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