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OGLE-2005-BLG-071Lb, THE MOST MASSIVE M DWARF PLANETARY COMPANION?
Dong, Subo,Gould, Andrew,Udalski, Andrzej,Anderson, Jay,Christie, G. W.,Gaudi, B. S.,Jaroszyń,ski, M.,Kubiak, M.,Szymań,ski, M. K.,Pietrzyń,ski, G.,Soszyń,ski, I.,Szewczyk, O.,Ulac IOP Publishing 2009 The Astrophysical journal Vol.695 No.2
A Planetary Microlensing Event with an Unusually Red Source Star: MOA-2011-BLG-291
Bennett, David P.,Udalski, Andrzej,Bond, Ian A.,Suzuki, Daisuke,Ryu, Yoon-Hyun,Abe, Fumio,Barry, Richard K.,Bhattacharya, Aparna,Donachie, Martin,Fukui, Akihiko,Hirao, Yuki,Kawasaki, Kohei,Kondo, Iona American Astronomical Society 2018 The Astronomical journal Vol.156 No.3
TRIPLE MICROLENS OGLE-2008-BLG-092L: BINARY STELLAR SYSTEM WITH A CIRCUMPRIMARY URANUS-TYPE PLANET
Poleski, Radosław,Skowron, Jan,Udalski, Andrzej,Han, Cheongho,Kozłowski, Szymon,Wyrzykowski, Łukasz,Dong, Subo,Szymań,ski, Michał K.,Kubiak, Marcin,Pietrzyń,ski, Grzegorz,Soszyń,ski, Ig IOP Publishing 2014 The Astrophysical journal Vol.795 No.1
<P>We present the gravitational microlensing discovery of a 4 M-Uranus planet that orbits a 0.7 M circle dot star at approximate to 18 AU. This is the first known analog of Uranus. Similar planets, i.e., cold ice giants, are inaccessible to either radial velocity or transit methods because of the long orbital periods, while low reflected light prevents direct imaging. We discuss how similar planets may contaminate the sample of the very short microlensing events that are interpreted as free-floating planets with an estimated rate of 1.8 per main-sequence star. Moreover, the host star has a nearby stellar (or brown dwarf) companion. The projected separation of the planet is only about three times smaller than that of the companion star, suggesting significant dynamical interactions.</P>
Poleski, Radosław,Zhu, Wei,Christie, Grant W.,Udalski, Andrzej,Gould, Andrew,Bachelet, Etienne,Skottfelt, Jesper,Novati, Sebastiano Calchi,Szymań,ski, M. K.,Soszyń,ski, I.,Pietrzyń,ski, American Astronomical Society 2016 The Astrophysical journal Vol.823 No.1
<P>The microlensing event OGLE-2015-BLG-0448 was observed by Spitzer and lay within the tidal radius of the globular cluster NGC 6558. The event had moderate magnification and was intensively observed, hence it had the potential to probe the distribution of planets in globular clusters. We measure the proper motion of NGC 6558 (mu(cl) (N, E) = (+0.36 +/- 0.10, +1.42 +/- 0.10) mas yr(-1)) as well as the source and show that the lens is not a cluster member. Even though this particular event does not probe the distribution of planets in globular clusters, other potential cluster lens events can be verified using our methodology. Additionally, we find that microlens parallax measured using Optical Gravitational Lens Experiment (OGLE) photometry is consistent with the value found based on the light curve displacement between the Earth and Spitzer.</P>
OGLE-2011-BLG-0417: A RADIAL VELOCITY TESTBED FOR MICROLENSING
Gould, Andrew,Shin, In-Gu,Han, Cheongho,Udalski, Andrzej,Yee, Jennifer C. IOP Publishing 2013 The Astrophysical journal Vol.768 No.2
<P>Microlensing experiments are returning increasingly detailed information about the planetary and binary systems that are being detected, far beyond what was originally expected. In several cases the lens mass and distance are measured, and a few very special cases have yielded complete eight-parameter Kepler solutions, i.e., the masses of both components, five Kepler invariants, and the phase. We identify one such case that is suitable for a precision test that could be carried out by comparing Doppler radial velocity (RV) measurements with the predictions from the microlensing solution. The lens primary is reasonably bright (I = 16.3, V = 18.2) and is expected to have a relatively large RV semi-amplitude (K similar to 6.35 km s(-1)).</P>
A NEW NONPLANETARY INTERPRETATION OF THE MICROLENSING EVENT OGLE-2013-BLG-0723
Han, Cheongho,Bennett, David P.,Udalski, Andrzej,Jung, Youn Kil American Astronomical Society 2016 The Astrophysical journal Vol.825 No.1
<P>Recently, the discovery of a Venus-mass planet orbiting a brown-dwarf host in a binary system was reported from the analysis of the microlensing event OGLE-2013-BLG-0723. We reanalyze the event considering the possibility of other interpretations. From this, we find a new solution where the lens is composed of two bodies, in contrast to the three-body solution of the previous analysis. The new solution better explains the observed light curve than the previous solution with Delta chi(2) similar to 202, suggesting that the new solution is a correct model for the event. From the estimation of the physical parameters based on the new interpretation, we find that the lens system is composed of two low-mass stars with similar to 0.2M(circle dot) and similar to 0.1M(circle dot) and located at a distance of similar to 3 kpc. The fact that the physical parameters correspond to those of the most common lens population located at a distance with a large lensing probability further supports the likelihood of the new interpretation. Considering that two dramatically different solutions can approximately explain the observed light curve, the event suggests the need for carefully testing all possible lens-system geometries.</P>
Measurement of Source Star Colors with the <i>K</i>2C9-CFHT Multi-color Microlensing Survey
Zang, Weicheng,Penny, Matthew T.,Zhu, Wei,Mao, Shude,Fouqué,, Pascal,Udalski, Andrzej,Hwang, Kyu-Ha,Wang, Tianshu,Huang, Chelsea,Boyajian, Tabetha. S.,Barentsen, Geert Astronomical Society of the Pacific 2018 Publications of the Astronomical Society of the Pa Vol.130 No.992