@Article{ChoiSHUSGBDFHSKSPPUPKSWABBBCFFFIKLMMMMOORSSSSSTTWYBSSSTABBCDDFGGHHHHHJJKKLLLMMPRRSSSSTWWABCDDGHJLMMMNNPTTYABBBCCCCDDDGKMMSZ:2012:NeTyAm,
author = "Choi, J. -Y. and Shin, I. -G. and Han, C. and Udalski, A. and
Sumi, T. and Gould, A. and Bozza, V. and Dominik, M. and
Fouqu{\'e}, P. and Horne, K. and Szyma ski, M. K. and Kubiak, M.
and Soszy ski, I. and Pietrzy ski, G. and Poleski, R. and Ulaczyk,
K. and Pietrukowicz, P. and Koz owski, S. and Skowron, J. and
Wyrzykowski, . and Abe, F. and Bennett, D. P. and Bond, I. A. and
Botzler, C. S. and Chote, P. and Freeman, M. and Fukui, A. and
Furusawa, K. and Itow, Y. and Kobara, S. and Ling, C. H. and
Masuda, K. and Matsubara, Y. and Miyake, N. and Muraki, Y. and
Ohmori, K. and Ohnishi, K. and Rattenbury, N. J. and Saito, To.
and Sullivan, D. J. and Suzuki, D. and Suzuki, K. and Sweatman, W.
L. and Takino, S. and Tristram, P. J. and Wada, K. and Yock, P. C.
M. and Bramich, D. M. and Snodgrass, C. and Steele, I. A. and
Street, R. A. and Tsapras, Y. and Alsubai, K. A. and Browne, P.
and Burgdorf, M. J. and Calchi Novati, S. and Dodds, P. and
Dreizler, S. and Fang, X. -S. and Grundahl, F. and Gu, C. -H. and
Hardis, S. and Harps e, K. and Hinse, T. C. and Hornstrup, A. and
Hundertmark, M. and Jessen-Hansen, J. and J rgensen, U. G. and
Kains, N. and Kerins, E. and Liebig, C. and Lund, M. and
Lunkkvist, M. and Mancini, L. and Mathiasen, M. and Penny, M. T.
and Rahvar, S. and Ricci, D. and Scarpetta, G. and Skottfelt, J.
and Southworth, J. and Surdej, J. and Tregloan-Reed, J. and
Wambsganss, J. and Wertz, O. and Almeida, Leonardo Andrade de and
Batista, V. and Christie, G. and Depoy, D. L. and Dong, Subo and
Gaudi, B. S. and Henderson, C. and Jablonski, Francisco and Lee,
C. -U. and McCormick, J. and McGregor, D. and Moorhouse, D. and
Natusch, T. and Ngan, H. and Pogge, R. W. and Tan, T. -G. and
Thornley, G. and Yee, J. C. and Albrow, M. D. and Bachelet, E. and
Beaulieu, J. -P. and Brillant, S. and Cassan, A. and Cole, A. A.
and Corrales, E. and Coutures, C. and Dieters, S. and Dominis
Prester, D. and Donatowicz, J. and Greenhill, J. and Kubas, D. and
Marquette, J. -B. and Menzies, J. W. and Sahu, K. C. and Zub, M.",
affiliation = "{} and {} and {} and {} and {} and {} and {} and {} and {} and {}
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{Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "A new type of ambiguity in the planet and binary interpretations
of central perturbations of high-magnification gravitational
microlensing events",
journal = "Astrophysical Journal",
year = "2012",
volume = "756",
number = "1",
pages = "48 (9pp)",
month = "Sep.",
keywords = "galactic bulge, gravitational microlensing.",
abstract = "High-magnification microlensing events provide an important
channel to detect planets. Perturbations near the peak of a
high-magnification event can be produced either by a planet or a
binary companion. It is known that central perturbations induced
by both types of companions can be generally distinguished due to
the essentially different magnification pattern around caustics.
In this paper, we present a case of central perturbations for
which it is difficult to distinguish the planetary and binary
interpretations. The peak of a lensing light curve affected by
this perturbation appears to be blunt and flat. For a planetary
case, this perturbation occurs when the source trajectory passes
the negative perturbation region behind the back end of an
arrowhead-shaped central caustic. For a binary case, a similar
perturbation occurs for a source trajectory passing through the
negative perturbation region between two cusps of an
astroid-shaped caustic. We demonstrate the degeneracy for two
high-magnification events of OGLE-2011-BLG-0526 and
OGLE-2011-BLG-0950/MOA-2011-BLG-336. For OGLE-2011-BLG-0526, the
\χ2 difference between the planetary and binary model is
\∼3, implying that the degeneracy is very severe. For OGLE-
2011-BLG-0950/MOA-2011-BLG-336, the stellar binary model is
formally excluded with \Δ\χ2 \∼ 105 and the
planetary model is preferred. However, it is difficult to claim a
planet discovery because systematic residuals of data from the
planetary model are larger than the difference between the
planetary and binary models. Considering that two events observed
during a single season suffer from such a degeneracy, it is
expected that central perturbations experiencing this type of
degeneracy is common.",
doi = "10.1088/0004-637X/756/1/48",
url = "http://dx.doi.org/10.1088/0004-637X/756/1/48",
issn = "0004-637X and 1538-4357",
label = "lattes: 7812463045514059 86
ChoiSHUSGBDFHSKSPPUPKSWABBBCFFFIKLMMMMOORSSSSSTTWYBSSSTABBCDDFGGHHHHHJJKKLLLMMPRRSSSSTWWABCDDGHJLMMMNNPTTYABBBCCCCDDDGKMMSZ:2012:NETYAM",
language = "pt",
urlaccessdate = "30 abr. 2024"
}