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Pregled bibliografske jedinice broj: 429077

Časopis

Autori: Batista, V.; ..., Dominis Prester, D.; ...
Naslov: Mass measurement of a single unseen star and planetary detection efficiency for OGLE 2007-BLG-050
Izvornik: Astronomy and astrophysics (0004-6361) 508 (2009), 1; 467-478
Vrsta rada: članak
Ključne riječi: astrophysics - earth and planetary astrophysics; astrophysics - solar and stellar astrophysics
Sažetak:
We analyze OGLE-2007-BLG-050, a high magnification microlensing event (A ~ 432) whose peak occurred on 2 May, 2007, with pronounced finite-source and parallax effects. We compute planet detection efficiencies for this event in order to determine its sensitivity to the presence of planets around the lens star. Both finite-source and parallax effects permit a measurement of the angular Einstein radius \theta_E = 0.48 +/- 0.01 mas and the parallax \pi_E = 0.12 +/- 0.03, leading to an estimate of the lens mass M = 0.50 +/- 0.14 M_Sun and its distance to the observer D_L = 5.5 +/- 0.4 kpc. This is only the second determination of a reasonably precise (<30%) mass estimate for an isolated unseen object, using any method. This allows us to calculate the planetary detection efficiency in physical units (r_\perp, m_p), where r_\perp is the projected planet-star separation and m_p is the planet mass. When computing planet detection efficiency, we did not find any planetary signature and our detection efficiency results reveal significant sensitivity to Neptune-mass planets, and to a lesser extent Earth-mass planets in some configurations. Indeed, Jupiter and Neptune-mass planets are excluded with a high confidence for a large projected separation range between the planet and the lens star, respectively [0.6 - 10] and [1.4 - 4] AU, and Earth-mass planets are excluded with a 10% confidence in the lensing zone, i.e. [1.8 - 3.1] AU.
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
Kategorija: Znanstveni
Znanstvena područja:
Fizika
URL Internet adrese: http://arxiv.org/PS_cache/arxiv/pdf/0907/0907.3471v3.pdf
http://adsabs.harvard.edu/abs/2009arXiv0907.3471B
Broj citata:
Altmetric:
DOI: 10.1051/0004-6361/200912923
URL cjelovitog teksta:
Google Scholar: Mass measurement of a single unseen star and planetary detection efficiency for OGLE 2007-BLG-050
Upisao u CROSBI: dijana@uniri.hr (dijana@uniri.hr), 3. Lis. 2009. u 17:49 sati



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