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Pregled bibliografske jedinice broj: 619097

Časopis

Autori: Bachelet, E.; ...; Dominis Prester, Dijana; ...; Wambsganss, J.
Naslov: MOA 2010-BLG-477Lb : Constraining the Mass of a Microlensing Planet from Microlensing Parallax, Orbital Motion, and Detection of Blended Light
Izvornik: The Astrophysical journal (0004-637X) 754 (2012), 1; 73-1-73-17
Vrsta rada: članak
Ključne riječi: gravitational lensing: micro; planetary systems
Sažetak:
Microlensing detections of cool planets are important for the construction of an unbiased sample to estimate the frequency of planets beyond the snow line, which is where giant planets are thought to form according to the core accretion theory of planet formation. In this paper, we report the discovery of a giant planet detected from the analysis of the light curve of a high-magnification microlensing event MOA 2010-BLG-477. The measured planet-star mass ratio is q = (2.181 ± 0.004) × 10-3 and the projected separation is s = 1.1228 ± 0.0006 in units of the Einstein radius. The angular Einstein radius is unusually large θE = 1.38 ± 0.11 mas. Combining this measurement with constraints on the "microlens parallax" and the lens flux, we can only limit the host mass to the range 0.13 < M/M sun < 1.0. In this particular case, the strong degeneracy between microlensing parallax and planet orbital motion prevents us from measuring more accurate host and planet masses. However, we find that adding Bayesian priors from two effects (Galactic model and Keplerian orbit) each independently favors the upper end of this mass range, yielding star and planet masses of M * = 0.67+0.33 - 0.13 M sun and mp = 1.5+0.8 - 0.3 M JUP at a distance of D = 2.3 ± 0.6 kpc, and with a semi-major axis of a = 2+3 - 1 AU. Finally, we show that the lens mass can be determined from future high-resolution near-IR adaptive optics observations independently from two effects, photometric and astrometric.
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/754/1/73/article
Broj citata:
Altmetric:
DOI: 10.1088/0004-637X/754/1/73
URL cjelovitog teksta:
Google Scholar: MOA 2010-BLG-477Lb : Constraining the Mass of a Microlensing Planet from Microlensing Parallax, Orbital Motion, and Detection of Blended Light
Upisao u CROSBI: Dijana Dominis Prester (dijana@phy.uniri.hr), 20. Vel. 2013. u 14:24 sati
Napomene:
The MiNDSTEp Consortium.



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