Hrvatska znanstvena bibliografija (CROSBI)



Pregled bibliografske jedinice broj: 619098

Časopis

Autori: Shin, I.-G.; ...; Dominis Prester, Dijana; ...; Zub, M.
Naslov: Characterizing Low-mass Binaries from Observation of Long-timescale Caustic-crossing Gravitational Microlensing Events
( Characterizing Low-mass Binaries from Observation of Long-timescale Caustic-crossing Gravitational Microlensing Events )
Izvornik: The Astrophysical journal (0004-637X) 755 (2012), 2; 91-1-91-10
Vrsta rada: članak
Ključne riječi: binaries: general; gravitational lensing: micro
( binaries: general; gravitational lensing: micro )
Sažetak:
Despite the astrophysical importance of binary star systems, detections are limited to those located in small ranges of separations, distances, and masses and thus it is necessary to use a variety of observational techniques for a complete view of stellar multiplicity across a broad range of physical parameters. In this paper, we report the detections and measurements of two binaries discovered from observations of microlensing events MOA-2011-BLG-090 and OGLE-2011-BLG-0417. Determinations of the binary masses are possible by simultaneously measuring the Einstein radius and the lens parallax. The measured masses of the binary components are 0.43 M sun and 0.39 M sun for MOA-2011-BLG-090 and 0.57 M sun and 0.17 M sun for OGLE-2011-BLG-0417 and thus both lens components of MOA-2011-BLG-090 and one component of OGLE-2011-BLG-0417 are M dwarfs, demonstrating the usefulness of microlensing in detecting binaries composed of low-mass components. From modeling of the light curves considering full Keplerian motion of the lens, we also measure the orbital parameters of the binaries. The blended light of OGLE-2011-BLG-0417 comes very likely from the lens itself, making it possible to check the microlensing orbital solution by follow-up radial-velocity observation. For both events, the caustic-crossing parts of the light curves, which are critical for determining the physical lens parameters, were resolved by high-cadence survey observations and thus it is expected that the number of microlensing binaries with measured physical parameters will increase in the future.
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://cdsads.u-strasbg.fr/abs/2012ApJ...755...91S
http://iopscience.iop.org/0004-637X/755/2/91/article
Broj citata:
Altmetric:
DOI: 10.1088/0004-637X/755/2/91
URL cjelovitog teksta:
Google Scholar: Characterizing Low-mass Binaries from Observation of Long-timescale Caustic-crossing Gravitational Microlensing Events
Upisao u CROSBI: Dijana Dominis Prester (dijana@phy.uniri.hr), 20. Vel. 2013. u 14:29 sati
Napomene:
PLANET Collaboration