46 citations · 340 across the 29 of their papers we have counts for
30 papers
Measured energy exchange in coronal hole solar wind from its solar origins to the heliosphere
Yeimy J. Rivera, Alin R. Paraschiv, Samuel T. Badman +33
Coordinated ground- and space-based remote observations are used to provide a comprehensive, multi-perspective view of the solar atmosphere that we connect with in situ measurement…
Gratis Mitigation of Polarization Aberration Effects in Coronagraphic Dark Holes
Richard A. Frazin
Direct imaging of exoplanets requires stellar coronagraphs capable of suppressing starlight to contrast levels below . Active wavefront control with deformable mirrors (DM…
Instrumental Polarization in Stellar Coronagraphy: Coherent Behavior and its Implications for Dark Hole Optimization
Richard A. Frazin
Stellar coronagraphs designed for high-contrast imaging of exoplanets inevitably introduce a small amount of instrumental polarization, called \emph{secondary polarization}. At the…
A Laboratory Method for Measuring the Cross-Polarization in High-Contrast Imaging
Richard A. Frazin
Existing Electric Field Conjugation (EFC) methods are not suited for treating small polarization effects, referred to here as cross polarization. EFC utilizes a deformable mirror (…
High contrast imaging at the photon noise limit with self-calibrating WFS/C systems
Olivier Guyon, Barnaby Norris, Marc-Antoine Martinod +20
High contrast imaging (HCI) systems rely on active wavefront control (WFC) to deliver deep raw contrast in the focal plane, and on calibration techniques to further enhance contras…
SCExAO, a testbed for developing high-contrast imaging technologies for ELTs
Kyohoon Ahn, Olivier Guyon, Julien Lozi +21
To directly detect exoplanets and protoplanetary disks, the development of high accuracy wavefront sensing and control (WFS&C) technologies is essential, especially for ground-base…
Millisecond Exoplanet Imaging, II: Regression Equations and Technical Discussion
Richard A Frazin, Alexander T Rodack
The leading difficulty in achieving the contrast necessary to directly image exoplanets and associated structures (eg. protoplanetary disks) at wavelengths ranging from the visible…
Millisecond Exoplanet Imaging, I: Method and Simulation Results
Alexander T Rodack, Richard A Frazin, Jared R Males +1
One of the top remaining science challenges in astronomical optics is the direct imaging and characterization of extrasolar planets and planetary systems. Directly imaging exoplane…
Laboratory Demonstration of Spatial Linear Dark Field Control For Imaging Extrasolar Planets in Reflected Light
Thayne Currie, Eugene Pluzhnik, Olivier Guyon +15
Imaging planets in reflected light, a key focus of future NASA missions and ELTs, requires advanced wavefront control to maintain a deep, temporally correlated null of stellar halo…
Thermodynamic Structure of the Solar Corona: Tomographic Reconstructions and MHD Modeling
D. G. Lloveras, A. M. Vásquez, F. A. Nuevo +5
We carry out a study of the global three-dimensional (3D) structure of the electron density and temperature of the quiescent inner solar corona () by means of tomog…
Directly Imaging Rocky Planets from the Ground
B. Mazin, É. Artigau, V. Bailey +59
Over the past three decades instruments on the ground and in space have discovered thousands of planets outside the solar system. These observations have given rise to an astonishi…
Treating Wavefront Measurement Error in Estimation of Non-Common Path Aberration for Direct Imaging of Exoplanets
Richard A. Frazin
One of the major difficulties limiting ground-based direct imaging of exoplanets with adaptive optics is quasi-static speckles in the science camera (SC) that obscure the planetary…
Direct Imaging in Reflected Light: Characterization of Older, Temperate Exoplanets With 30-m Telescopes
Etienne Artigau, Rebecca A. Bernstein, Timothy Brandt +22
Direct detection, also known as direct imaging, is a method for discovering and characterizing the atmospheres of planets at intermediate and wide separations. It is the only means…
Efficient, Nonlinear Phase Estimation with the Non-Modulated Pyramid Wavefront Sensor
Richard A. Frazin
The sensitivity of the the pyramid wavefront sensor (PyWFS) has made it a popular choice for astronomical adaptive optics (AAO) systems, and it is at its most sensitive when it is…
Fast, Nonlinear Phase Estimation with the Non-Modulated Pyramid Wavefront Sensor at Low Strehl Ratio
Richard Frazin
Most adaptive optics (AO) systems using pyramid wavefront sensors (PyWFS) to estimate the phase of the pupil field use mechanical modulation of the beam in order to increase the dy…
Energy Input Flux in the Global Quiet-Sun Corona
C. Mac Cormack, A. M. Vásquez, M. López Fuentes +3
We present first results of a novel technique that provides, for the first time, constraints on the energy input flux at the coronal base () of the qui…
Finding the Dark Hole with the Lights On: A New Approach to Focal Plane Wavefront Sensing
Richard A. Frazin
In direct imaging of exoplanets from space, achieving the required dynamic range (i.e., planet-to-star contrast in brightness) currently relies on coronagraphic technology combined…
Empirical Green's Function Approach for Utilizing Millisecond Focal and Pupil Plane Telemetry in Exoplanet Imaging
Richard A. Frazin
Millisecond focal plane telemetry is now becoming practical due to a new generation of near-IR detector arrays with sub-electron noise that are capable of kHz readout rates. Combin…
Time-Dependent Tomographic Reconstruction of the Solar Corona
Didier Vibert, Christelle Peillon, Philippe Lamy +2
Solar rotational tomography (SRT) applied to white-light coronal images observed at multiple aspect angles has been the preferred approach for determining the three-dimensional (3D…
A Statistical Framework for the Utilization of Simultaneous Pupil Plane and Focal Plane Telemetry for Exoplanet Imaging, Part I: Accounting for Aberrations in Multiple Planes
Richard A. Frazin
A new generation of telescopes with mirror diameters of 20 m or more, called extremely large telescopes (ELTs) has the potential to provide unprecedented imaging and spectroscopy o…
A Statistical Framework for Utilization of Simultaneous Pupil Plane and Focal Plane Telemetry for Exoplanet Imaging, Part II: The Science Camera Image as a Function of the Wavefront Sensor Field
Richard A. Frazin
In an effort to transcend the limitations of differential imaging of exoplanets in the era of extremely large telescopes (ELTs), the first paper in this series established a rigoro…
Multimodal Differential Emission Measure in the Solar Corona
Federico A. Nuevo, Alberto M. Vásquez, Enrico Landi +1
The Atmospheric Imaging Assembly (AIA) telescope on board the Solar Dynamics Observatory (SDO) provides coronal EUV imaging over a broader temperature sensitivity range than the pr…
Direct Imaging of Exoplanets Without Background Subtraction: Implications for ELTs
Richard A. Frazin
The ultra-high contrast capability required to form images of other solar systems is arguably the highest-profile challenge in astronomy today. The current high-contrast imaging ef…
A Steady-State Picture of Solar Wind Acceleration and Charge State Composition Derived from a Global Wave-Driven MHD Model
Rona Oran, Enrico Landi, Bart van der Holst +7
The higher charge states found in slow (400km s) solar wind streams compared to fast streams have supported the hypothesis that the slow wind originates in closed coronal…