399 citations · 7.3k across the 144 of their papers we have counts for
26 papers · 1 filter
Post-processing CHARIS integral field spectrograph data with PyKLIP
Minghan Chen, Jason J. Wang, Timothy D. Brandt +4
We present the pyKLIP-CHARIS post-processing pipeline, a Python library that reduces high contrast imaging data for the CHARIS integral field spectrograph used with the SCExAO proj…
TESS-Gaia Light Curve: a PSF-based TESS FFI light curve product
Te Han, Timothy D. Brandt
The Transiting Exoplanet Survey Satellite (TESS) is continuing its second extended mission after 55 sectors of observations. TESS publishes full-frame images (FFI) at a cadence of…
Probing Photon Statistics in Adaptive Optics Images with SCExAO/MEC
Sarah Steiger, Timothy D. Brandt, Olivier Guyon +11
We present an experimental study of photon statistics for high-contrast imaging with the Microwave Kinetic Inductance Detector (MKID) Exoplanet Camera (MEC) located behind the Suba…
Design of SCALES: A 2-5 Micron Coronagraphic Integral Field Spectrograph for Keck Observatory
Andrew Skemer, R. Deno Stelter, Stephanie Sallum +49
We present the design of SCALES (Slicer Combined with Array of Lenslets for Exoplanet Spectroscopy) a new 2-5 micron coronagraphic integral field spectrograph under construction fo…
htof: A new open-source tool for analyzing Hipparcos, Gaia, and future astrometric missions
G. Mirek Brandt, Daniel Michalik, Timothy D. Brandt +3
We present htof, an open-source tool for interpreting and fitting the intermediate astrometric data (IAD) from both the 1997 and 2007 reductions of Hipparcos, the scanning-law of G…
exoplanet: Gradient-based probabilistic inference for exoplanet data & other astronomical time series
Daniel Foreman-Mackey, Rodrigo Luger, Eric Agol +13
"exoplanet" is a toolkit for probabilistic modeling of astronomical time series data, with a focus on observations of exoplanets, using PyMC3 (Salvatier et al., 2016). PyMC3 is a f…
orvara: An Efficient Code to Fit Orbits using Radial Velocity, Absolute, and/or Relative Astrometry
Timothy D. Brandt, Trent J. Dupuy, Yiting Li +5
We present an open-source Python package, Orbits from Radial Velocity, Absolute, and/or Relative Astrometry (orvara), to fit Keplerian orbits to any combination of radial velocity,…
Cleaning Images with Gaussian Process Regression
Hengyue Zhang, Timothy D. Brandt
Many approaches to astronomical data reduction and analysis cannot tolerate missing data: corrupted pixels must first have their values imputed. This paper presents astrofix, a rob…
The Automated Data Extraction, Processing, and Tracking System for CHARIS
Taylor L. Tobin, Jeffery Chilcote, Timothy Brandt +4
CHARIS is an IFS designed for imaging and spectroscopy of disks and sub-stellar companions. To improve ease of use and efficiency of science production, we present progress on a fu…
Update on the Preliminary Design of SCALES: the Santa Cruz Array of Lenslets for Exoplanet Spectroscopy
R. Deno Stelter, Andrew J. Skemer, Steph Sallum +16
SCALES (Santa Cruz Array of Lenslets for Exoplanet Spectroscopy) is a 2-5 micron high-contrast lenslet integral-field spectrograph (IFS) driven by exoplanet characterization scienc…
On-sky performance and recent results from the Subaru coronagraphic extreme adaptive optics system
Thayne Currie, Olivier Guyon, Julien Lozi +10
We describe the current on-sky performance of the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) instrument on the Subaru telescope on Maunakea, Hawaii. SCExAO is continuing…
End-to-end Simulation of the SCALES Integral Field Spectrograph
Zackery Briesemeister, Steph Sallum, Andrew Skemer +3
We present end-to-end simulations of SCALES, the third generation thermal-infrared diffraction limited imager and low/med-resolution integral field spectrograph (IFS) being designe…
Automatic Echelle Spectrograph Wavelength Calibration
G. M. Brandt, T. D. Brandt, C. McCully
Time domain astronomy and the increasing number of exoplanet candidates call for reliable, robust, and automatic wavelength calibration. We present an algorithm for wavelength cali…
Performance and Early Science with the Subaru Coronagraphic Extreme Adaptive Optics Project
Thayne Currie, Olivier Guyon, Julien Lozi +9
We describe the current performance of the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) instrument on the Subaru telescope on Maunakea, Hawaii and present early science re…
Stochastic Speckle Discrimination with Time-Tagged Photon Lists: Digging Below the Speckle Noise Floor
Alex B. Walter, Clinton Bockstiegel, Timothy D. Brandt +1
We present an algorithm that uses the distribution of photon arrival times to distinguish speckles from incoherent sources, like planets and disks, in high contrast images. Using s…
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…
The Planetary Systems Imager: 2-5 Micron Channel
Andrew J. Skemer, Deno Stelter, Dimitri Mawet +15
We summarize the red channel (2-5 micron) of the Planetary Systems Imager (PSI), a proposed second-generation instrument for the TMT. Cold exoplanets emit the majority of their lig…
Laboratory and On-Sky Validation of the Shaped Pupil Coronagraph's Sensitivity to Low-Order Aberrations With Active Wavefront Control
Thayne Currie, N. Jeremy Kasdin, Tyler Groff +10
We present early laboratory simulations and extensive on-sky tests validating of the performance of a shaped pupil coronagraph (SPC) behind an extreme-AO corrected beam of the Suba…
The Exoplanet Simple Orbit Fitting Toolbox (ExoSOFT): An Open-Source Tool for Efficient Fitting of Astrometric and Radial Velocity Data
Kyle Mede, Timothy D. Brandt
We present the Exoplanet Simple Orbit Fitting Toolbox (ExoSOFT), a new, open-source suite to fit the orbital elements of planetary or stellar mass companions to any combination of…
Simulating the WFIRST coronagraph Integral Field Spectrograph
Maxime J. Rizzo, Tyler D. Groff, Neil T. Zimmerman +12
A primary goal of direct imaging techniques is to spectrally characterize the atmospheres of planets around other stars at extremely high contrast levels. To achieve this goal, cor…
Data Reduction Pipeline for the CHARIS Integral-Field Spectrograph I: Detector Readout Calibration and Data Cube Extraction
Timothy D. Brandt, Maxime Rizzo, Tyler Groff +14
We present the data reduction pipeline for CHARIS, a high-contrast integral-field spectrograph for the Subaru Telescope. The pipeline constructs a ramp from the raw reads using the…
CHARIS Science: Performance Simulations for the Subaru Telescope's Third-Generation of Exoplanet Imaging Instrumentation
Timothy D. Brandt, Michael W. McElwain, Markus Janson +21
We describe the expected scientific capabilities of CHARIS, a high-contrast integral-field spectrograph (IFS) currently under construction for the Subaru telescope. CHARIS is part…
The Optical Design of CHARIS: An Exoplanet IFS for the Subaru Telescope
Mary Anne Peters-Limbach, Tyler D. Groff, N. Jeremy Kasdin +15
High-contrast imaging techniques now make possible both imaging and spectroscopy of planets around nearby stars. We present the optical design for the Coronagraphic High Angular Re…
New Techniques for High-Contrast Imaging with ADI: the ACORNS-ADI SEEDS Data Reduction Pipeline
Timothy D. Brandt, Michael W. McElwain, Edwin L. Turner +44
We describe Algorithms for Calibration, Optimized Registration, and Nulling the Star in Angular Differential Imaging (ACORNS-ADI), a new, parallelized software package to reduce hi…