K
Kouichi Tokita
Researcher at University of Tokyo
Publications - 45
Citations - 6226
Kouichi Tokita is an academic researcher from University of Tokyo. The author has contributed to research in topics: Supernova & Redshift. The author has an hindex of 24, co-authored 41 publications receiving 5905 citations.
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Journal ArticleDOI
The Hubble Space Telescope Cluster Supernova Survey. V. Improving the Dark-energy Constraints above z > 1 and Building an Early-type-hosted Supernova Sample
Nao Suzuki,Nao Suzuki,David Rubin,David Rubin,C. Lidman,Greg Aldering,Rahman Amanullah,K. Barbary,K. Barbary,L. F. Barrientos,János Botyánszki,Mark Brodwin,Natalia Connolly,Kyle S. Dawson,Arjun Dey,Mamoru Doi,Megan Donahue,Susana E. Deustua,Peter Eisenhardt,Erica Ellingson,L. Faccioli,L. Faccioli,Vitaliy Fadeyev,H. K. Fakhouri,H. K. Fakhouri,A. S. Fruchter,David Gilbank,Michael D. Gladders,Gerson Goldhaber,Gerson Goldhaber,Anthony H. Gonzalez,Ariel Goobar,Alexander Gude,Alexander Gude,Takashi Hattori,Henk Hoekstra,Eric Hsiao,Eric Hsiao,X. Huang,X. Huang,Yutaka Ihara,Myungkook J. Jee,David Johnston,David Johnston,Nobunari Kashikawa,Benjamin P. Koester,Kohki Konishi,M. Kowalski,Eric V. Linder,Eric V. Linder,Lori M. Lubin,Jason Melbourne,J. Meyers,J. Meyers,Tomoki Morokuma,Tomoki Morokuma,F. Munshi,F. Munshi,Christopher R. Mullis,Takeshi Oda,Nino Panagia,Saul Perlmutter,Saul Perlmutter,Marc Postman,T. A. Pritchard,T. A. Pritchard,Jason Rhodes,P. Ripoche,P. Ripoche,Piero Rosati,David J. Schlegel,A. L. Spadafora,S. A. Stanford,S. A. Stanford,Vallery Stanishev,Vallery Stanishev,Daniel Stern,M. Strovink,M. Strovink,Naohiro Takanashi,Kouichi Tokita,M. Wagner,Lifan Wang,Naoki Yasuda,H. K. C. Yee +84 more
TL;DR: In this article, Advanced Camera for Surveys, NICMOS and Keck adaptive-optics-assisted photometry of 20 Type Ia supernovae (SNe Ia) from the Hubble Space Telescope (HST) Cluster Supernova Survey was presented.
Journal ArticleDOI
First-Year Sloan Digital Sky Survey-II Supernova Results: Hubble Diagram and Cosmological Parameters
Richard Kessler,Andrew C. Becker,D. Cinabro,Jake Vanderplas,Joshua A. Frieman,Joshua A. Frieman,John Marriner,Tamara M. Davis,Tamara M. Davis,Benjamin Dilday,Jon A. Holtzman,Saurabh Jha,Hubert Lampeitl,Masao Sako,Mathew Smith,Mathew Smith,Chen Zheng,Robert C. Nichol,Bruce A. Bassett,Ralf Bender,Darren L. DePoy,Mamoru Doi,Mamoru Doi,Ed Elson,Alexei V. Filippenko,Ryan J. Foley,Ryan J. Foley,Peter M. Garnavich,Ulrich Hopp,Yutaka Ihara,William Ketzeback,Wolfram Kollatschny,Kohki Konishi,Jennifer L. Marshall,R. J. McMillan,G. Miknaitis,Tomoki Morokuma,Edvard Mörtsell,Kaike Pan,J. L. Prieto,Michael Richmond,Adam G. Riess,Adam G. Riess,Roger W. Romani,Donald P. Schneider,Jesper Sollerman,Jesper Sollerman,Naohiro Takanashi,Kouichi Tokita,Kurt van der Heyden,John C Wheeler,Naoki Yasuda,Donald G. York +52 more
TL;DR: In this article, the authors present measurements of the Hubble diagram for 103 Type Ia supernovae with redshifts 0.04 < z < 0.42, discovered during the first season (Fall 2005) of the Sloan Digital Sky Survey-II (SDSS-II) Supernova Survey.
Journal ArticleDOI
First-year Sloan Digital Sky Survey-II (SDSS-II) Supernova Results: Hubble Diagram and Cosmological Parameters
Richard Kessler,Andrew C. Becker,D. Cinabro,Jake Vanderplas,Joshua A. Frieman,John Marriner,Tamara M. Davis,Benjamin Dilday,Jon A. Holtzman,Saurabh Jha,Hubert Lampeitl,Masao Sako,Mathew Smith,Chen Zheng,Robert C. Nichol,Bruce A. Bassett,Ralf Bender,Darren L. DePoy,Mamoru Doi,Ed Elson,Alex V. Filippenko,Ryan J. Foley,Peter M. Garnavich,Ulrich Hopp,Yutaka Ihara,William Ketzeback,Wolfram Kollatschny,Kohki Konishi,Jennifer L. Marshall,Russet McMillan,Gajus Miknaitis,Tomoki Morokuma,Edvard M"ortsell,Kaike Pan,J. L. Prieto,Michael Richmond,Adam G. Riess,Roger W. Romani,Donald P. Schneider,Jesper Sollerman,Naohiro Takanashi,Kouichi Tokita,Kurt van der Heyden,John C Wheeler,Naoki Yasuda,Donald G. York +45 more
TL;DR: In this article, the cosmological parameters of Type Ia supernovae with redshifts 0.04 < z < 0.42 were estimated using the SALT-II fitter.
Journal ArticleDOI
The sloan digital sky survey-II supernova survey: technical summary
Joshua A. Frieman,Joshua A. Frieman,Bruce A. Bassett,Andrew C. Becker,Changsu Choi,D. Cinabro,F. DeJongh,Darren L. DePoy,Ben Dilday,Mamoru Doi,Peter M. Garnavich,Craig J. Hogan,Jon A. Holtzman,Myungshin Im,Saurabh Jha,Richard Kessler,Kohki Konishi,Hubert Lampeitl,John Marriner,Jennifer L. Marshall,D. McGinnis,G. Miknaitis,Robert C. Nichol,J. L. Prieto,Adam G. Riess,Adam G. Riess,Michael Richmond,Roger W. Romani,Masao Sako,Donald P. Schneider,Mathew Smith,Naohiro Takanashi,Kouichi Tokita,Kurt van der Heyden,Naoki Yasuda,Chen Zheng,Jennifer K. Adelman-McCarthy,James Annis,Roberto J. Assef,J. C. Barentine,J. C. Barentine,Ralf Bender,Roger Blandford,William N. Boroski,Malcolm N. Bremer,Howard Brewington,Chris A. Collins,Arlin P. S. Crotts,Jack Dembicky,Jason D. Eastman,Alastair C. Edge,Edmond Edmondson,Edward C. Elson,Michael E. Eyler,Alexei V. Filippenko,Ryan J. Foley,Stephan Frank,Ariel Goobar,Tina Gueth,James E. Gunn,Michael Harvanek,Michael Harvanek,Ulrich Hopp,Yutaka Ihara,Želko Ivezić,Steven M. Kahn,Jared Kaplan,Stephen B. H. Kent,Stephen B. H. Kent,William Ketzeback,S. J. Kleinman,S. J. Kleinman,Wolfram Kollatschny,Richard G. Kron,Jurek Krzesinski,D. Lamenti,Giorgos Leloudas,Huan Lin,Dan Long,John R. Lucey,Robert H. Lupton,Elena Malanushenko,Viktor Malanushenko,Russet McMillan,Javier Méndez,Christopher W. Morgan,Christopher W. Morgan,Tomoki Morokuma,Atsuko Nitta,Linda Ostman,Kaike Pan,Constance M. Rockosi,A. Kathy Romer,Pilar Ruiz-Lapuente,G. Saurage,K. Schlesinger,Stephanie A. Snedden,Jesper Sollerman,Jesper Sollerman,Chris Stoughton,Maximilian Stritzinger,Mark SubbaRao,Douglas L. Tucker,Petri Väisänen,Linda C. Watson,S. Watters,J. Craig Wheeler,Brian Yanny,Donald G. York +108 more
TL;DR: The Sloan Digital Sky Survey-II (SDSS-II) as mentioned in this paper is a multi-year project to identify and measure light curves for intermediate-redshift (0.05 < z < 0.35) Type Ia supernovae (SNe Ia) using repeated five-band imaging over an area of 300 sq. deg.
Journal ArticleDOI
The Sloan Digital Sky Survey-II Supernova Survey: Technical Summary
Joshua A. Frieman,Bruce A. Bassett,Andrew C. Becker,Changsu Choi,D. Cinabro,F. DeJongh,Darren L. DePoy,B. Dilday,Mamoru Doi,Peter M. Garnavich,Craig J. Hogan,Jon A. Holtzman,Myungshin Im,Saurabh Jha,Richard Kessler,Kohki Konishi,H. Lampeitl,J. P. Marriner,Jennifer L. Marshall,D. McGinnis,G. Miknaitis,Robert C. Nichol,J. L. Prieto,Adam G. Riess,Michael Richmond,Roger W. Romani,Masao Sako,Donald P. Schneider,Mathew Smith,Naohiro Takanashi,Kouichi Tokita,K. van der Heyden,Naoki Yasuda,Chen Zheng,Jennifer K. Adelman-McCarthy,J. Annis,Roberto J. Assef,J. C. Barentine,Ralf Bender,Roger Blandford,William N. Boroski,M. N. Bremer,Howard Brewington,Chris A. Collins,Arlin P. S. Crotts,Jack Dembicky,Jason D. Eastman,Alastair C. Edge,E. M. Edmondson,Edward C. Elson,Michael E. Eyler,Alexei V. Filippenko,Ryan J. Foley,Stephan Frank,Ariel Goobar,T. Gueth,James E. Gunn,Mike Harvanek,Ulrich Hopp,Yutaka Ihara,Ž. Ivezić,Steven M. Kahn,Jared Kaplan,Steve Kent,William Ketzeback,S. J. Kleinman,Wolfram Kollatschny,Richard G. Kron,J. Krzesinski,D. Lamenti,Giorgos Leloudas,Huan Lin,Dan Long,John R. Lucey,Robert H. Lupton,E. Malanushenko,V. Malanushenko,R. J. McMillan,Javier Méndez,Christopher W. Morgan,Tomoki Morokuma,Atsuko Nitta,L. Ostman,Kaike Pan,C. M. Rockosi,A. K. Romer,P. Ruiz-Lapuente,G. Saurage,Katharine J. Schlesinger,S. A. Snedden,Jesper Sollerman,Christopher Stoughton,Maximilian Stritzinger,M. Subbarao,Douglas L. Tucker,Petri Väisänen,Linda C. Watson,S. Watters,John C Wheeler,B. Yanny,Donald G. York +100 more
TL;DR: The Sloan Digital Sky Survey-II (SDSS-II) as discussed by the authors is a multi-year project to identify and measure light curves for intermediate-redshift (0.05 < z < 0.35) Type Ia supernovae (SNe Ia) using repeated five-band imaging over an area of 300 sq. deg.