J
John Krist
Researcher at Jet Propulsion Laboratory
Publications - 221
Citations - 11928
John Krist is an academic researcher from Jet Propulsion Laboratory. The author has contributed to research in topics: Coronagraph & Exoplanet. The author has an hindex of 59, co-authored 213 publications receiving 11274 citations. Previous affiliations of John Krist include Ames Research Center & California Institute of Technology.
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Journal ArticleDOI
Optical Images of an Exosolar Planet 25 Light-Years from Earth
Paul Kalas,James R. Graham,Eugene Chiang,Michael P. Fitzgerald,Mark Clampin,Edwin S. Kite,Karl R. Stapelfeldt,Christian Marois,John Krist +8 more
TL;DR: Optical observations of an exoplanet candidate, Fomalhaut b, show that the planet's mass is at most three times that of Jupiter; a higher mass would lead to gravitational disruption of the belt, matching predictions of its location.
Journal ArticleDOI
Hubble Space Telescope Observations of the Disk and Jet of HH 30
Christopher J. Burrows,Christopher J. Burrows,Karl R. Stapelfeldt,Alan M. Watson,John Krist,Gilda E. Ballester,John Clarke,David Crisp,John S. Gallagher,Richard E. Griffiths,J. Jeff Hester,John G. Hoessel,Jon A. Holtzman,Jeremy Mould,Paul A. Scowen,John T. Trauger,James A. Westphal +16 more
TL;DR: In this paper, the authors show that a flared disk with a radius of about 250 AU obscures the star H 30 in Taurus has been imaged with the Hubble Space Telescope WFPC2.
Proceedings ArticleDOI
20 years of Hubble Space Telescope optical modeling using Tiny Tim
TL;DR: The Tiny Tim PSF simulation software package has been the standard HST modeling software since its release in early 1992 as mentioned in this paper, and has been used extensively for HST data analysis.
Journal ArticleDOI
The Morphology-Density Relation in z ~ 1 Clusters
Marc Postman,M. Franx,Nicholas Cross,Bradford P. Holden,Holland C. Ford,Garth D. Illingworth,Tomotsugu Goto,Ricardo Demarco,Piero Rosati,John P. Blakeslee,Kim-Vy Tran,Narciso Benítez,Narciso Benítez,M. Clampin,George F. Hartig,Nicole Homeier,David R. Ardila,F. Bartko,Rychard Bouwens,Larry Bradley,Tom Broadhurst,Robert A. Brown,C. J. Burrows,E. S. Cheng,Paul D. Feldman,David A. Golimowski,Caryl Gronwall,Leopoldo Infante,Randy A. Kimble,John Krist,Michael Lesser,André R. Martel,Simona Mei,Felipe Menanteau,Gerhardt R. Meurer,George K. Miley,V. Motta,Marco Sirianni,William B. Sparks,Hien D. Tran,Zlatan Tsvetanov,R. L. White,W. Zheng +42 more
TL;DR: The morphology-density relation (MDR) and morphology-radius relation (MRR) for galaxies in seven z ~ 1 clusters that have been observed with the Advanced Camera for Surveys (ACS) on board the Hubble Space Telescope were measured in this article.
Journal ArticleDOI
Strong-lensing analysis of a1689 from deep advanced camera images
Tom Broadhurst,Narciso Benítez,Narciso Benítez,Dan Coe,Keren Sharon,K. Zekser,Richard L. White,Holland C. Ford,Rychard Bouwens,John P. Blakeslee,M. Clampin,Nicholas Cross,Marijn Franx,Brenda Frye,George F. Hartig,Garth D. Illingworth,Leopoldo Infante,Felipe Menanteau,Gerhardt R. Meurer,Marc Postman,David R. Ardila,F. Bartko,Robert A. Brown,C. J. Burrows,E. S. Cheng,Paul D. Feldman,David A. Golimowski,Tomotsugu Goto,Caryl Gronwall,D. Herranz,Bradford P. Holden,Nicole Homeier,John Krist,Michael Lesser,André R. Martel,George K. Miley,Piero Rosati,M. Sirianni,W. B. Sparks,Susanna Steindling,Hien D. Tran,Zlatan Tsvetanov,W. Zheng +42 more
TL;DR: In this article, a flexible light deflection field was constructed to predict the appearance and positions of counterimages of the largest known gravitational lens, A1689, and the model was refined as new counterimages were identified and incorporated to improve the model, yielding a total of 106 images of 30 multiply lensed background galaxies.