N
Naoki Koshimoto
Researcher at University of Tokyo
Publications - 227
Citations - 4668
Naoki Koshimoto is an academic researcher from University of Tokyo. The author has contributed to research in topics: Gravitational microlensing & Planet. The author has an hindex of 34, co-authored 197 publications receiving 3992 citations. Previous affiliations of Naoki Koshimoto include National Institutes of Natural Sciences, Japan & Institut d'Astrophysique de Paris.
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Journal ArticleDOI
The exoplanet mass-ratio function from the moa-ii survey: discovery of a break and likely peak at a neptune mass
Daisuke Suzuki,David P. Bennett,David P. Bennett,Takahiro Sumi,Ian A. Bond,Leslie A. Rogers,Fumio Abe,Yuichiro Asakura,Aparna Bhattacharya,Aparna Bhattacharya,Martin Donachie,M. Freeman,Akihiko Fukui,Yuki Hirao,Yoshitaka Itow,Naoki Koshimoto,Man Cheung Alex Li,C. H. Ling,Kimiaki Masuda,Yutaka Matsubara,Yasushi Muraki,Masayuki Nagakane,K. Onishi,H. Oyokawa,Nicholas J. Rattenbury,To. Saito,A. Sharan,Hiroshi Shibai,Denis J. Sullivan,Paul J. Tristram,Atsunori Yonehara +30 more
TL;DR: In this article, the authors report the results of the statistical analysis of planetary signals discovered in MOA-II microlensing survey alert system events from 2007 to 2012, and determine the survey sensitivity as a function of planet star mass ratio, q, and projected planet star separation, s, in Einstein radius units.
Journal ArticleDOI
The Exoplanet Mass-Ratio Function from the MOA-II Survey: Discovery of a Break and Likely Peak at a Neptune Mass
Daisuke Suzuki,David P. Bennett,Takahiro Sumi,Ian A. Bond,Leslie A. Rogers,Fumio Abe,Yuichiro Asakura,A. Bhattacharya,M. Donachie,M. Freeman,Akihiko Fukui,Y. Hirao,Yoshitaka Itow,Naoki Koshimoto,M. C. A. Li,C. H. Ling,Kimiaki Masuda,Yutaka Matsubara,Yasushi Muraki,M. Nagakane,K. Onishi,H. Oyokawa,Nicholas J. Rattenbury,A. Sharan,Hiroshi Shibai,Denis J. Sullivan,Paul J. Tristram,Atsunori Yonehara +27 more
TL;DR: In this article, the authors report the results of the statistical analysis of planetary signals discovered in MOA-II microlensing survey alert system events from 2007 to 2012, finding significant planetary signals in 23 of the 1474 alert events that are well characterized by the MOA II survey data alone, and combine this analysis with the previous analyses of Gould et al. and Cassan et al., bringing the total sample to 30 planets.
Journal ArticleDOI
Chemical evolution of the Galactic bulge as traced by microlensed dwarf and subgiant stars. VI. Age and abundance structure of the stellar populations in the central sub-kpc of the Milky Way
Thomas Bensby,Sofia Feltzing,Andrew Gould,Andrew Gould,Andrew Gould,Jennifer C. Yee,Jennifer A. Johnson,Martin Asplund,Jorge Melendez,Sara Lucatello,L. M. Howes,Andrew McWilliam,Andrzej Udalski,Michał K. Szymański,Igor Soszyński,Radosław Poleski,Radosław Poleski,A. Wyrzykowski,Krzysztof Ulaczyk,Krzysztof Ulaczyk,S. Kozlowski,P. Pietrukowicz,Jan Skowron,P. Mróz,J. M. Pawlak,Fumio Abe,Yuichiro Asakura,Aparna Bhattacharya,Ian A. Bond,David P. Bennett,Yuki Hirao,Masayuki Nagakane,Naoki Koshimoto,Takahiro Sumi,Daisuke Suzuki,P. J. Tristram +35 more
TL;DR: In this paper, a detailed elemental abundance study of 90 F and G dwarfs, turn-off, and subgiant stars in the Galactic bulge has been presented, based on high-resolution spectra acquired during gravitational microlensing events.
Journal ArticleDOI
MOA-2011-BLG-262Lb: A Sub-Earth-Mass Moon Orbiting a Gas Giant Primary or a High Velocity Planetary System in the Galactic Bulge
David P. Bennett,V. Batista,Ian A. Bond,C. S. Bennett,C. S. Bennett,Daisuke Suzuki,J. P. Beaulieu,Andrzej Udalski,J. Donatowicz,Valerio Bozza,Valerio Bozza,Fumio Abe,C. S. Botzler,M. Freeman,D. Fukunaga,Akihiko Fukui,Yoshitaka Itow,Naoki Koshimoto,C. H. Ling,Kimiaki Masuda,Yutaka Matsubara,Yasushi Muraki,S. Namba,Kouji Ohnishi,Nicholas J. Rattenbury,To. Saito,Denis J. Sullivan,Takahiro Sumi,Winston L. Sweatman,Paul J. Tristram,N. Tsurumi,K. Wada,Philip Yock,Michael D. Albrow,Etienne Bachelet,S. Brillant,J. A. R. Caldwell,Arnaud Cassan,Andrew A. Cole,E. Corrales,C. Coutures,S. Dieters,D. Dominis Prester,Pascal Fouqué,J. G. Greenhill,Keith Horne,J.-R. Koo,D. Kubas,J. B. Marquette,R. Martin,J. W. Menzies,Kailash C. Sahu,Joachim Wambsganss,Andrew Williams,M. Zub,J.-Y. Choi,Darren L. DePoy,Subo Dong,B. S. Gaudi,Andrew Gould,Chang S. Han,Calen B. Henderson,D. McGregor,C.-U. Lee,Richard W. Pogge,I.-G. Shin,Jennifer C. Yee,Jennifer C. Yee,Michał K. Szymański,Jan Skowron,Radek Poleski,Radek Poleski,S. Kozllowski,Lukasz Wyrzykowski,M. Kubiak,Paweł Pietrukowicz,Grzegorz Pietrzyński,Grzegorz Pietrzyński,Igor Soszyński,Krzysztof Ulaczyk,Yiannis Tsapras,Yiannis Tsapras,Rachel Street,Martin Dominik,Martin Dominik,D. M. Bramich,P. Browne,M. Hundertmark,N. Kains,Colin Snodgrass,Iain A. Steele,I. Dékány,Oscar A. Gonzalez,D. Heyrovsky,Ryo Kandori,Eamonn Kerins,P. W. Lucas,Dante Minniti,Takahiro Nagayama,Marina Rejkuba,Annie C. Robin,R. Saito +101 more
TL;DR: In this paper, the first microlensing candidate for a free-floating exoplanet-exomoon system, MOA-2011-BLG-262, with a primary lens mass of M host ~ 4 Jupiter masses hosting a sub-Earth mass moon was presented.
Journal ArticleDOI
The frequency of snowline-region planets from four-years of OGLE-MOA-Wise second-generation microlensing.
Yossi Shvartzvald,D. Maoz,Andrzej Udalski,Takahiro Sumi,M. Friedmann,Shai Kaspi,Radosław Poleski,Michał K. Szymański,Jan Skowron,S. Kozlowski,Łukasz Wyrzykowski,P. Mróz,P. Pietrukowicz,Grzegorz Pietrzyński,Igor Soszyński,Krzysztof Ulaczyk,Fumio Abe,Richard K. Barry,David P. Bennett,Aparna Bhattacharya,Ian A. Bond,M. Freeman,K. Inayama,Yoshitaka Itow,Naoki Koshimoto,C. H. Ling,Kimiaki Masuda,Akihiko Fukui,Yutaka Matsubara,Yasushi Muraki,K. Ohnishi,Nicholas J. Rattenbury,T. Saito,Denis J. Sullivan,Daisuke Suzuki,P. J. Tristram,Y. Wakiyama,Atsunori Yonehara +37 more
TL;DR: A "second-generation" microlensing survey for extrasolar planets, consisting of near-continuous time coverage by the OGLE, MOA, and Wise surveys, suggests a minimum in the distribution in the super-Jupiter mass range, and a relatively high occurrence of brown-dwarf companions.