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MICROSTRUCTURE AND NOISE CHARACTERISTICS IN Co - Cr BASED ALLOY THIN FILM MAGNETIC RECORDING MEDIA
Y. Koshimoto,S. Hirono,T. Ohkubo,S. Umemura,Y. Maeda 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
Reducing media noise is a key to realizing high areal recording density. However, perpendicularly oriented Co-Cr films, strong candidates for high density recording media, have received little attention in terms of recording noise. We studied the noise characteristics of Co-Cr based alloy films by varying the compositionally separated structure.<br/> Co-Cr films with fine compositionally separated microstructure were observed to have low noise, which recording density dependence were negative or week. Studies on control of the microstructure and magnetic properties in combination with noise analysis are important to realize high density recording media.
The First Planetary Microlensing Event with Two Microlensed Source Stars
Bennett, D. P.,Udalski, A.,Han, C.,Bond, I. A.,Beaulieu, J.-P.,Skowron, J.,Gaudi, B. S.,Koshimoto, N.,Abe, F.,Asakura, Y.,Barry, R. K.,Bhattacharya, A.,Donachie, M.,Evans, P.,Fukui, A.,Hirao, Y.,Itow, American Astronomical Society 2018 The Astronomical journal Vol.155 No.3
REVISITING THE MICROLENSING EVENT OGLE 2012-BLG-0026: A SOLAR MASS STAR WITH TWO COLD GIANT PLANETS
Beaulieu, J.-P.,Bennett, D. P.,Batista, V.,Fukui, A.,Marquette, J.-B.,Brillant, S.,Cole, A. A.,Rogers, L. A.,Sumi, T.,Abe, F.,Bhattacharya, A.,Koshimoto, N.,Suzuki, D.,Tristram, P. J.,Han, C.,Gould, A American Astronomical Society 2016 The Astrophysical Journal Vol.824 No.2
<P>Two cold gas giant planets orbiting a G-type main-sequence star in the galactic disk were previously discovered in the high-magnification microlensing event OGLE-2012-BLG-0026. Here, we present revised host star flux measurements and a refined model for the two-planet system using additional light curve data. We performed high angular resolution adaptive optics imaging with the Keck and Subaru telescopes at two epochs while the source star was still amplified. We detected the lens flux, H = 16.39 +/- 0.08. The lens, a disk star, is brighter than predicted from the modeling in the original study. We revisited the light curve modeling using additional photometric data from the B&C telescope in New Zealand and CTIO 1.3 m H-band light curve. We then include the Keck and Subaru adaptive optic observation constraints. The system is composed of a similar to 4-9 Gyr lens star of M-lens = 1.06 +/- 0.05 M circle dot at a distance of D-lens = 4.0 +/- 0.3 kpc, orbited by two giant planets of 0.145 +/- 0.008 M-Jup and 0.86 +/- 0.06 M-Jup, with projected separations of 4.0 +/- 0.5 au and 4.8 +/- 0.7 au, respectively. Because the lens is brighter than the source star by 16 +/- 8% in H, with no other blend within one arcsec, it will be possible to estimate its metallicity using subsequent IR spectroscopy with 8-10 m class telescopes. By adding a constraint on the metallicity it will be possible to refine the age of the system.</P>
A Likely Detection of a Two-planet System in a Low-magnification Microlensing Event
Suzuki, D.,Bennett, D. P.,Udalski, A.,Bond, I. A.,Sumi, T.,Han, C.,Kim, Ho-il.,Abe, F.,Asakura, Y.,Barry, R. K.,Bhattacharya, A.,Donachie, M.,Freeman, M.,Fukui, A.,Hirao, Y.,Itow, Y.,Koshimoto, N.,Li, American Astronomical Society 2018 The Astronomical journal Vol.155 No.6
MOA-2011-BLG-322Lb: a 'second generation survey' microlensing planet
Shvartzvald, Y.,Maoz, D.,Kaspi, S.,Sumi, T.,Udalski, A.,Gould, A.,Bennett, D. P.,Han, C.,Abe, F.,Bond, I. A.,Botzler, C. S.,Freeman, M.,Fukui, A.,Fukunaga, D.,Itow, Y.,Koshimoto, N.,Ling, C. H.,Masuda Oxford University Press 2014 MONTHLY NOTICES- ROYAL ASTRONOMICAL SOCIETY Vol.439 No.1
OGLE-2017-BLG-0482Lb: A Microlensing Super-Earth Orbiting a Low-mass Host Star
Han, C.,Hirao, Y.,Udalski, A.,Lee, C.-U.,Bozza, V.,Gould, A.,Abe, F.,Barry, R.,Bond, I. A.,Bennett, D. P.,Bhattacharya, A.,Donachie, M.,Evans, P.,Fukui, A.,Itow, Y.,Kawasaki, K.,Koshimoto, N.,Li, M. C American Astronomical Society 2018 The Astronomical journal Vol.155 No.5