T
Teppei Okumura
Researcher at Institute for the Physics and Mathematics of the Universe
Publications - 111
Citations - 6044
Teppei Okumura is an academic researcher from Institute for the Physics and Mathematics of the Universe. The author has contributed to research in topics: Redshift & Galaxy. The author has an hindex of 32, co-authored 103 publications receiving 5602 citations. Previous affiliations of Teppei Okumura include Academia Sinica Institute of Astronomy and Astrophysics & Academia Sinica.
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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
Frequency of solar-like systems and of ice and gas giants beyond the snow line from high-magnification microlensing events in 2005-2008
Andrew Gould,Subo Dong,B. S. Gaudi,Andrzej Udalski,Ian A. Bond,J. G. Greenhill,Rachel Street,Martin Dominik,Takahiro Sumi,Michał K. Szymański,C. Han,William H. Allen,Greg Bolt,M. Bos,G. W. Christie,Darren L. DePoy,Jack D. Drummond,Jason D. Eastman,Avishay Gal-Yam,D. Higgins,J. Janczak,Shai Kaspi,Szymon Kozłowski,C.-U. Lee,F. Mallia,Anaëlle Maury,D. Maoz,Jennie McCormick,L. A. G. Monard,D. Moorhouse,N. D. Morgan,Tim Natusch,Eran O. Ofek,Byeong-Gon Park,Richard W. Pogge,David Polishook,R. Santallo,Avi Shporer,O. Spector,G. Thornley,Jennifer C. Yee,M. Kubiak,Grzegorz Pietrzyński,Igor Soszyński,O. Szewczyk,Łukasz Wyrzykowski,Krzysztof Ulaczyk,Radosław Poleski,Fumio Abe,David P. Bennett,C. S. Botzler,D. Douchin,M. Freeman,Akihiko Fukui,K. Furusawa,John B. Hearnshaw,S. Hosaka,Yoshitaka Itow,K. Kamiya,P. M. Kilmartin,A. Korpela,W. Lin,C. H. Ling,S. Makita,Kimiaki Masuda,Yutaka Matsubara,N. Miyake,Yasushi Muraki,M. Nagaya,K. Nishimoto,Kouji Ohnishi,Teppei Okumura,Y. C. Perrott,L. Philpott,Nicholas J. Rattenbury,To. Saito,Takashi Sako,Denis J. Sullivan,W. L. Sweatman,P. J. Tristram,E. von Seggern,P. C. M. Yock,Michael D. Albrow,V. Batista,J. P. Beaulieu,S. Brillant,J. Caldwell,J. J. Calitz,Arnaud Cassan,Andrew A. Cole,K. W. Cook,C. Coutures,S. Dieters,D. Dominis Prester,J. Donatowicz,Pascal Fouqué,K. Hill,M. Hoffman,Francisco Jablonski,Stephen R. Kane,N. Kains,D. Kubas,J.-B. Marquette,R. M. Martin,Eder Martioli,P. J. Meintjes,J. Menzies,Ettore Pedretti,K. R. Pollard,K. C. Sahu,C. Vinter,J. Wambsganss,R. A. Watson,Andrew Williams,M. Zub,Alasdair Allan,M. F. Bode,D. M. Bramich,Martin Burgdorf,N. Clay,S. Fraser,E. Hawkins,Keith Horne,E. Kerins,T. A. Lister,C. Mottram,E. S. Saunders,Colin Snodgrass,Iain A. Steele,Yiannis Tsapras,U. G. Jørgensen,Timo Anguita,Valerio Bozza,S. Calchi Novati,K. Harpsøe,Tobias C. Hinse,M. Hundertmark,P. Kjærgaard,C. Liebig,C. Liebig,Luigi Mancini,G. Masi,M. Mathiasen,Sohrab Rahvar,Davide Ricci,Gaetano Scarpetta,John Southworth,Jean Surdej,Christina C. Thöne,Christina C. Thöne +149 more
TL;DR: In this paper, the authors presented the first measurement of the planet frequency beyond the "snow line," for the planet-to-star mass-ratio interval during 2005-2008 microlensing events during the survey-plus-follow-up high-magnification channel.
Journal ArticleDOI
Discovery of a Jupiter/Saturn Analog with Gravitational Microlensing
B. S. Gaudi,David P. Bennett,Andrzej Udalski,Andrew Gould,G. W. Christie,D. Maoz,Subo Dong,Jennie McCormick,Michał K. Szymański,P. J. Tristram,S. Nikolaev,Bohdan Paczynski,M. Kubiak,Grzegorz Pietrzyński,Grzegorz Pietrzyński,Igor Soszyński,O. Szewczyk,Krzysztof Ulaczyk,Łukasz Wyrzykowski,Łukasz Wyrzykowski,Darren L. DePoy,C. Han,Shai Kaspi,C.-U. Lee,F. Mallia,Tim Natusch,Richard W. Pogge,Byeong-Gon Park,Fumio Abe,Ian A. Bond,C. S. Botzler,Akihiko Fukui,John B. Hearnshaw,Yoshitaka Itow,Kisaku Kamiya,A. V. Korpela,P. M. Kilmartin,W. Lin,Kimiaki Masuda,Yutaka Matsubara,M. Motomura,Yasushi Muraki,Shota Nakamura,Teppei Okumura,Kouji Ohnishi,Nicholas J. Rattenbury,Takashi Sako,To. Saito,Shuji Sato,L. Skuljan,Denis J. Sullivan,Takahiro Sumi,Winston L. Sweatman,Philip Yock,Michael D. Albrow,Alasdair Allan,J.-P. Beaulieu,Martin Burgdorf,K. H. Cook,C. Coutures,Martin Dominik,S. Dieters,Pascal Fouqué,J. G. Greenhill,Keith Horne,Iain A. Steele,Yiannis Tsapras,Brian Chaboyer,A. Crocker,Stephan Frank,Bruce Macintosh +70 more
TL;DR: Two planets with masses that could not have been detected with other techniques are identified; their discovery from only six confirmed microlensing planet detections suggests that solar system analogs may be common.
Journal ArticleDOI
A Low-Mass Planet with a Possible Sub-Stellar-Mass Host in Microlensing Event MOA-2007-BLG-192
David P. Bennett,Ian A. Bond,Andrzej Udalski,Takahiro Sumi,Fumio Abe,Akihiko Fukui,K. Furusawa,John B. Hearnshaw,S. Holderness,Yoshitaka Itow,Kisaku Kamiya,A. V. Korpela,P. M. Kilmartin,W. Lin,C. H. Ling,Kimiaki Masuda,Yutaka Matsubara,N. Miyake,Yasushi Muraki,M. Nagaya,Teppei Okumura,Kouji Ohnishi,Y. C. Perrott,Nicholas J. Rattenbury,Takashi Sako,To. Saito,Susumu Sato,L. Skuljan,Denis J. Sullivan,Winston L. Sweatman,P. J. Tristram,Philip Yock,M. Kubiak,Michał K. Szymański,Grzegorz Pietrzyński,Grzegorz Pietrzyński,Igor Soszyński,O. Szewczyk,O. Szewczyk,Łukasz Wyrzykowski,Łukasz Wyrzykowski,Krzysztof Ulaczyk,V. Batista,J. P. Beaulieu,S. Brillant,Arnaud Cassan,P. Fouque,Pierre Kervella,D. Kubas,J. B. Marquette +49 more
TL;DR: In this paper, the authors reported the detection of an extrasolar planet of mass ratio q~2×10-4 in microlensing event MOA-2007-BLG-192.
Journal ArticleDOI
A COLD NEPTUNE-MASS PLANET OGLE-2007-BLG-368Lb: COLD NEPTUNES ARE COMMON
Takahiro Sumi,D. P. Bennett,Ian A. Bond,Andrzej Udalski,V. Batista,Martin Dominik,Martin Dominik,P. Fouqué,D. Kubas,Andrew Gould,Bruce Macintosh,K. H. Cook,Subo Dong,L. Skuljan,Arnaud Cassan,Fumio Abe,C. S. Botzler,Akihiko Fukui,K. Furusawa,John B. Hearnshaw,Yoshitaka Itow,Kisaku Kamiya,P. M. Kilmartin,A. V. Korpela,W. Lin,C. H. Ling,Kimiaki Masuda,Yutaka Matsubara,N. Miyake,Yasushi Muraki,M. Nagaya,Takahiro Nagayama,Kouji Ohnishi,Teppei Okumura,Y. C. Perrott,Nicholas J. Rattenbury,To. Saito,Takashi Sako,D. J. Sullivan,Winston L. Sweatman,P. J. Tristram,Philip Yock,J. P. Beaulieu,Andrew A. Cole,Ch. Coutures,M. F. Duran,J. G. Greenhill,Francisco Jablonski,U. Marboeuf,Eder Martioli,Ettore Pedretti,Ondřej Pejcha,Patricio Rojo,Michael D. Albrow,S. Brillant,M. F. Bode,D. M. Bramich,Martin Burgdorf,Martin Burgdorf,J. A. R. Caldwell,H. Calitz,E. Corrales,S. Dieters,S. Dieters,D. Dominis Prester,J. Donatowicz,K. M. Hill,K. M. Hill,M. Hoffman,Keith Horne,U. G. Jørgensen,N. Kains,Stephen R. Kane,J. B. Marquette,R. M. Martin,P. J. Meintjes,J. W. Menzies,K. R. Pollard,Kailash C. Sahu,Colin Snodgrass,Iain A. Steele,Rachel Street,Yiannis Tsapras,Joachim Wambsganss,Andrew Williams,M. Zub,Michał K. Szymański,M. Kubiak,Grzegorz Pietrzyński,Grzegorz Pietrzyński,Igor Soszyński,O. Szewczyk,Łukasz Wyrzykowski,Krzysztof Ulaczyk,William H. Allen,G. W. Christie,Darren L. DePoy,B. S. Gaudi,C. Han,J. Janczak,C.-U. Lee,Jennie McCormick,F. Mallia,B. Monard,Tim Natusch,Byeong-Gon Park,Richard W. Pogge,R. Santallo +107 more
TL;DR: The OGLE-2007-BLG-368Lb with a planet-star mass ratio of q = [9.5 ± 2.1] × 10^(-5] via gravitational microlensing was discovered in real-time thanks to the high cadence of the Microlensing Observations in Astrophysics survey and intensive followup observations.