R
Ryan Chornock
Researcher at Northwestern University
Publications - 404
Citations - 53422
Ryan Chornock is an academic researcher from Northwestern University. The author has contributed to research in topics: Supernova & Galaxy. The author has an hindex of 109, co-authored 387 publications receiving 48531 citations. Previous affiliations of Ryan Chornock include University of California, Berkeley & CFA Institute.
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Type Ia supernova discoveries at z > 1 from the Hubble Space Telescope: Evidence for past deceleration and constraints on dark energy evolution
Adam G. Riess,Louis-Gregory Strolger,John L. Tonry,Stefano Casertano,Henry C. Ferguson,Bahram Mobasher,Peter Challis,Alexei V. Filippenko,Saurabh Jha,Weidong Li,Ryan Chornock,Robert P. Kirshner,Bruno Leibundgut,Mark Dickinson,Mario Livio,Mauro Giavalisco,Charles C. Steidel,Txitxo Benítez,Zlatan Tsvetanov +18 more
TL;DR: For a flat universe with a cosmological constant, the transition between the two epochs is constrained to be at z = 0.46 ± 0.13 as mentioned in this paper, and w = -1.02 ± (and w < -0.76 at the 95% confidence level) for an assumed static equation of state of dark energy.
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Type Ia Supernova Discoveries at z>1 From the Hubble Space Telescope: Evidence for Past Deceleration and Constraints on Dark Energy Evolution
Adam G. Riess,Louis-Gregory Strolger,John L. Tonry,Stefano Casertano,Henry C. Ferguson,Bahram Mobasher,Peter Challis,Alexei V. Filippenko,Saurabh Jha,Weidong Li,Ryan Chornock,Robert P. Kirshner,Bruno Leibundgut,Mark Dickinson,Mario Livio,Mauro Giavalisco,Charles C. Steidel,Narciso Benítez,Zlatan Tsvetanov +18 more
TL;DR: In this article, the first conclusive evidence for cosmic deceleration that preceded the current epoch of cosmic acceleration was provided by the discovery of 16 Type Ia supernovae with the Hubble Space Telescope (HST).
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A 2.4% determination of the local value of the hubble constant*
Adam G. Riess,Adam G. Riess,Lucas M. Macri,Samantha L. Hoffmann,Daniel Scolnic,Daniel Scolnic,Stefano Casertano,Alexei V. Filippenko,Brad E. Tucker,Brad E. Tucker,Mark J. Reid,David O. Jones,Jeffrey M. Silverman,Ryan Chornock,Peter Challis,Wenlong Yuan,Peter J. Brown,Ryan J. Foley +17 more
TL;DR: In this paper, the authors used the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST) to reduce the uncertainty in the local value of the Hubble constant from 3.3% to 2.4%.
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The Complete Light-curve Sample of Spectroscopically Confirmed SNe Ia from Pan-STARRS1 and Cosmological Constraints from the Combined Pantheon Sample
Daniel Scolnic,David O. Jones,Armin Rest,Armin Rest,Yen-Chen Pan,Ryan Chornock,Ryan J. Foley,M. E. Huber,Richard Kessler,Gautham Narayan,Adam G. Riess,Adam G. Riess,Steven A. Rodney,Edo Berger,D. Brout,Peter Challis,Maria R. Drout,Douglas P. Finkbeiner,Ragnhild Lunnan,Robert P. Kirshner,N. E. Sanders,Edward F. Schlafly,Stephen J. Smartt,Christopher W. Stubbs,John L. Tonry,W. M. Wood-Vasey,Michael Foley,J. Hand,Elizabeth N. Johnson,W. S. Burgett,K. C. Chambers,Peter W. Draper,Klaus W. Hodapp,Nick Kaiser,R. P. Kudritzki,E. A. Magnier,Nigel Metcalfe,F. Bresolin,E. E. E. Gall,Rubina Kotak,M. McCrum,K. W. Smith +41 more
TL;DR: Scolnic et al. as discussed by the authors presented optical light curves, redshifts, and classifications for 365 spectroscopically confirmed Type Ia supernovae (SNe Ia) discovered by the Pan-STARRS1 (PS1) Medium Deep Survey.
Journal ArticleDOI
A 3% Solution: Determination of the Hubble Constant with the Hubble Space Telescope and Wide Field Camera 3
Adam G. Riess,Adam G. Riess,Lucas M. Macri,Stefano Casertano,Hubert Lampeitl,Henry C. Ferguson,Alexei V. Filippenko,Saurabh Jha,Weidong Li,Ryan Chornock +9 more
TL;DR: In this paper, the authors used the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope (HST) to determine the Hubble constant from optical and infrared observations of over 600 Cepheid variables in the host galaxies of eight recent Type Ia supernovae (SNe Ia), providing the calibration for a magnitude-redshift relation based on 253 SNeIa.