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Yutaka Matsubara
Researcher at Nagoya University
Publications - 457
Citations - 18270
Yutaka Matsubara is an academic researcher from Nagoya University. The author has contributed to research in topics: Gravitational microlensing & Planet. The author has an hindex of 64, co-authored 410 publications receiving 17264 citations. Previous affiliations of Yutaka Matsubara include Kyoto University & Konan University.
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Journal ArticleDOI
Extension of the Cosmic-Ray Energy Spectrum Beyond the Predicted Greisen-Zatsepin-Kuz'min Cutoff
M. Takeda,Naoaki Hayashida,K. Honda,N. Inoue,K. Kadota,Fumio Kakimoto,K. Kamata,S. Kawaguchi,Yoshiya Kawasaki,N. Kawasumi,H. Kitamura,E. Kusano,Yutaka Matsubara,K. Murakami,M. Nagano,D. Nishikawa,Hideyuki Ohoka,N. Sakaki,M. Sasaki,K. Shinozaki,N. Souma,Masahiro Teshima,R. Torii,I. Tsushima,Y. Uchihori,Takashi Yamamoto,S. Yoshida,H. Yoshii +27 more
TL;DR: In this article, the Akeno giant air shower array (AAGA) data set was used to investigate the spectral properties of the cosmic-ray energy spectrum above the 2.7 K cutoff.
Journal ArticleDOI
Discovery of a cool planet of 5.5 Earth masses through gravitational microlensing
J. P. Beaulieu,David P. Bennett,Pascal Fouqué,Andrew Williams,Martin Dominik,U. G. Jørgensen,D. Kubas,Arnaud Cassan,C. Coutures,J. G. Greenhill,K. M. Hill,J. W. Menzies,Penny D. Sackett,Michael D. Albrow,S. Brillant,J. A. R. Caldwell,J. J. Calitz,K. H. Cook,E. Corrales,M. Desort,S. Dieters,D. Dominis,J. Donatowicz,M. Hoffman,Stephen R. Kane,J. B. Marquette,R. M. Martin,P. J. Meintjes,K. R. Pollard,Kailash C. Sahu,C. Vinter,Joachim Wambsganss,K. Woller,Keith Horne,Iain A. Steele,D. M. Bramich,D. M. Bramich,Martin Burgdorf,Colin Snodgrass,M. F. Bode,Andrzej Udalski,Michał K. Szymański,M. Kubiak,T. Wiȩckowski,Grzegorz Pietrzyński,Igor Soszyński,O. Szewczyk,Łukasz Wyrzykowski,Bohdan Paczynski,Fumio Abe,Ian A. Bond,T. R. Britton,T. R. Britton,A. C. Gilmore,John B. Hearnshaw,Yoshitaka Itow,Kisaku Kamiya,P. M. Kilmartin,A. V. Korpela,Kimiaki Masuda,Yutaka Matsubara,M. Motomura,Yasushi Muraki,Shota Nakamura,C. Okada,Kouji Ohnishi,Nicholas J. Rattenbury,Takashi Sako,Susumu Sato,Misao Sasaki,T. Sekiguchi,Denis J. Sullivan,P. J. Tristram,Philip Yock,T. Yoshioka +74 more
TL;DR: The detection of a cool, sub-Neptune-mass planets may be more common than gas giant planets, as predicted by the core accretion theory, and is suggested to name OGLE-2005-BLG-390Lb, indicating a planetary mass companion to the lens star of the microlensing event.
Journal ArticleDOI
Unbound or distant planetary mass population detected by gravitational microlensing
Takahiro Sumi,Kisaku Kamiya,David P. Bennett,Ian A. Bond,Fumio Abe,C. S. Botzler,Akihiko Fukui,K. Furusawa,John B. Hearnshaw,Yoshitaka Itow,P. M. Kilmartin,A. V. Korpela,W. Lin,C. H. Ling,Kimiaki Masuda,Yutaka Matsubara,N. Miyake,M. Motomura,Yasushi Muraki,M. Nagaya,Shota Nakamura,Kouji Ohnishi,Teppei Okumura,Y. C. Perrott,Nicholas J. Rattenbury,To. Saito,T. K. Sako,Denis J. Sullivan,Winston L. Sweatman,P. J. Tristram,P. C. M. Yock,Andrzej Udalski,Michał K. Szymański,M. Kubiak,Grzegorz Pietrzyński,Radosław Poleski,Igor Soszyński,Łukasz Wyrzykowski,K. Ulaczyk +38 more
TL;DR: The discovery of a population of unbound or distant Jupiter-mass objects is reported, which are almost twice as common as main-sequence stars, based on two years of gravitational microlensing survey observations towards the Galactic Bulge.
Journal ArticleDOI
Real-time difference imaging analysis of moa galactic bulge observations during 2000
Ian A. Bond,Ian A. Bond,Fumio Abe,R. J. Dodd,R. J. Dodd,R. J. Dodd,John B. Hearnshaw,Morihiro Honda,Jun Jugaku,P. M. Kilmartin,P. M. Kilmartin,A. Marles,Kimiaki Masuda,Yutaka Matsubara,Yasushi Muraki,Takashi Nakamura,G. Nankivell,S. Noda,C. Noguchi,Kouji Ohnishi,Nicholas J. Rattenbury,M. Reid,To. Saito,Hiroshi Sato,Maki Sekiguchi,J. Skuljan,D. J. Sullivan,Takahiro Sumi,Mine Takeuti,Yoshiyuki Watase,S. Wilkinson,R. Yamada,T. Yanagisawa,Philip Yock +33 more
TL;DR: In this paper, the authors describe observations carried out by the MOA group of the Galactic bulge during 2000 that were designed to detect efficiently gravitational microlensing of faint stars in which the magnification is high and/or of short duration.
Journal ArticleDOI
Small-Scale Anisotropy of Cosmic Rays above 1019 eV Observed with the Akeno Giant Air Shower Array
Masahiro Takeda,Naoaki Hayashida,K. Honda,N. Inoue,K. Kadota,Fumio Kakimoto,K. Kamata,S. Kawaguchi,Yoshiya Kawasaki,N. Kawasumi,E. Kusano,Yutaka Matsubara,K. Murakami,M. Nagano,D. Nishikawa,H. Ohoka,S. Osone,N. Sakaki,M. Sasaki,K. Shinozaki,N. Souma,Masahiro Teshima,R. Torii,I. Tsushima,Y. Uchihori,T. Yamamoto,S. Yoshida,H. Yoshii +27 more
TL;DR: The arrival direction distribution of these extremely high energy cosmic rays has been studied in this article, and it is shown that the distribution is uniform with respect to the arrival direction of lower-energy cosmic rays in the Akeno giant air shower array.