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William F. Hoffmann
Researcher at University of Arizona
Publications - 189
Citations - 8763
William F. Hoffmann is an academic researcher from University of Arizona. The author has contributed to research in topics: Stars & Telescope. The author has an hindex of 41, co-authored 187 publications receiving 8356 citations. Previous affiliations of William F. Hoffmann include Steward Health Care System & University of Hawaii.
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Journal ArticleDOI
The Infrared Array Camera (IRAC) for the Spitzer Space Telescope
Giovanni G. Fazio,Joseph L. Hora,Lori E. Allen,M. L. N. Ashby,Pauline Barmby,Lynne K. Deutsch,Lynne K. Deutsch,J.-S. Huang,S. C. Kleiner,Massimo Marengo,S. T. Megeath,Gary J. Melnick,Michael A. Pahre,Brian M. Patten,J. Polizotti,Howard A. Smith,R. S. Taylor,Zhong Wang,S. P. Willner,William F. Hoffmann,Judy Pipher,William J. Forrest,C. W. McMurty,Craig R. McCreight,Mark E. McKelvey,Robert E. McMurray,David G. Koch,Samuel H. Moseley,R. G. Arendt,John Eric Mentzell,Catherine T. Marx,P. Losch,P. Mayman,W. Eichhorn,Danny J. Krebs,Murzy D. Jhabvala,Daniel Y. Gezari,D. J. Fixsen,J. Flores,K. Shakoorzadeh,R. Jungo,Claef Hakun,Lois G. Workman,Gabriel Karpati,R. Kichak,R. Whitley,S. Mann,Eric V. Tollestrup,Peter Eisenhardt,Daniel Stern,Varoujan Gorjian,Bidushi Bhattacharya,Sean Carey,Brant O. Nelson,William J. Glaccum,Mark Lacy,Patrick J. Lowrance,Seppo Laine,William T. Reach,J. A. Stauffer,Jason Surace,Gillian Wilson,Edward L. Wright,Alan W. Hoffman,George Domingo,Martin Cohen +65 more
TL;DR: The Infrared Array Camera (IRAC) is one of three focal plane instruments on the Spitzer Space Telescope as mentioned in this paper, which is a four-channel camera that obtains simultaneous broadband images at 3.6, 4.5, 5.8, and 8.0 m.
Journal ArticleDOI
Mass and Kinetic Energy of the Homunculus Nebula around η Carinae
Nathan Smith,Nathan Smith,Robert D. Gehrz,Philip M. Hinz,William F. Hoffmann,Joseph L. Hora,Eric E. Mamajek,Michael R. Meyer +7 more
TL;DR: In this article, the authors examined thermal infrared images of η Car at wavelengths from 4.8 to 25 μm obtained with the MIRAC3 camera system at the Magellan Observatory, and concluded that roughly 10 M⊙ or more resides instead in the rapidly expanding polar lobes of the Homunculus, known to be ejected during the 19th century.
Journal ArticleDOI
FIRST LIGHT LBT AO IMAGES OF HR 8799 bcde AT 1.6 AND 3.3 μm: NEW DISCREPANCIES BETWEEN YOUNG PLANETS AND OLD BROWN DWARFS*
Andrew J. Skemer,Philip M. Hinz,Simone Esposito,Adam Burrows,Jarron Leisenring,Michael F. Skrutskie,Silvano Desidera,Dino Mesa,Carmelo Arcidiacono,Filippo Mannucci,Timothy J. Rodigas,Laird M. Close,Donald W. McCarthy,Craig Kulesa,Guido Agapito,Daniel Apai,Javier Argomedo,Vanessa P. Bailey,K. Boutsia,Runa Briguglio,Guido Brusa,Lorenzo Busoni,Riccardo Claudi,Joshua Eisner,Luca Fini,Katherine B. Follette,Peter M. Garnavich,Raffaele Gratton,J. C. Guerra,John M. Hill,William F. Hoffmann,Terry J. Jones,M. Krejny,Jared R. Males,Elena Masciadri,Michael Meyer,Douglas L. Miller,Katie M. Morzinski,Matthew J. Nelson,Enrico Pinna,Alfio Puglisi,Sascha P. Quanz,Fernando Quiros-Pacheco,Armando Riccardi,P. Stefanini,Vidhya Vaitheeswaran,John C. Wilson,Marco Xompero +47 more
TL;DR: In this paper, the spectral energy distribution of the HR 8799 planets is modeled as a mixture of clouds of varying opacity, similar to the patchy cloud structures on Jupiter and L/T transition brown dwarfs.
Journal ArticleDOI
First Light LBT AO Images of HR 8799 bcde at 1.65 and 3.3 Microns: New Discrepancies between Young Planets and Old Brown Dwarfs
Andrew J. Skemer,Philip M. Hinz,Simone Esposito,Adam Burrows,Jarron Leisenring,Michael F. Skrutskie,Silvano Desidera,Dino Mesa,Carmelo Arcidiacono,Filippo Mannucci,Timothy J. Rodigas,Laird M. Close,Donald W. McCarthy,Craig Kulesa,Guido Agapito,Daniel Apai,Javier Argomedo,Vanessa P. Bailey,K. Boutsia,Runa Briguglio,Guido Brusa,Lorenzo Busoni,Riccardo Claudi,Joshua Eisner,Luca Fini,Katherine B. Follette,Peter M. Garnavich,Raffaele Gratton,Juan Carlos Guerra,John M. Hill,William F. Hoffmann,Terry Jones,Megan Krejny,Jared R. Males,Elena Masciadri,Michael Meyer,Douglas L. Miller,Katie M. Morzinski,Matthew J. Nelson,Enrico Pinna,Alfio Puglisi,Sascha P. Quanz,Fernando Quiros-Pacheco,Armando Riccardi,P. Stefanini,Vidhya Vaitheeswaran,John C. Wilson,Marco Xompero +47 more
TL;DR: In this paper, the authors used the LBT adaptive optics system, PISCES, and LBTI/LMIRCam to image all four of the HR 8799 planets at H-band and 3.3 microns.
Proceedings ArticleDOI
In-flight performance and calibration of the Infrared Array Camera (IRAC) for the Spitzer Space Telescope
Joseph L. Hora,Giovanni G. Fazio,Lori E. Allen,Matthew L. N. Ashby,Pauline Barmby,Lynne K. Deutsch,Jiasheng S. Huang,Massimo Marengo,S. T. Megeath,Gary J. Melnick,Michael A. Pahre,Brian M. Patten,Howard A. Smith,Zhong Wang,Steven P. Willner,William F. Hoffmann,Judith L. Pipher,William J. Forrest,Craig W. McMurtry,Craig R. McCreight,Mark E. McKelvey,Robert E. McMurray,Samuel H. Moseley,Richard G. Arendt,John Eric Mentzell,Catherine T. Marx,D. J. Fixsen,Eric V. Tollestrup,Peter Eisenhardt,Daniel Stern,Varoujan Gorjian,Bidushi Bhattacharya,Sean Carey,William J. Glaccum,Mark Lacy,Patrick Lowrance,Seppo Laine,Brant O. Nelson,William T. Reach,John R. Stauffer,Jason Surace,Gillian Wilson,Edward L. Wright +42 more
TL;DR: In this paper, the authors summarize the in-flight scientific, technical, and operational performance of IRAC in two nearly adjacent fields of view on the Spitzer Space Telescope (SST) and show that IRAC is a four-channel camera that obtains simultaneous broad-band images at 3.6, 4.5, 5.8, and 8.0 μm.