Articles by Alexandra Z. Greenbaum

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Alexandra Z. Greenbaum

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The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems II: A 1 to 20 Micron Spectrum of the Planetary-Mass Companion VHS 1256-1257 b

4 July 2024 by Brittany Miles and others

Earth and Planetary Astrophysics, Solar and Stellar Astrophysics

JWST-TST High Contrast: Achieving direct spectroscopy of faint substellar companions next to bright stars with the NIRSpec IFU

31 May 2024 by Jean-Baptiste Ruffio and others

Earth and Planetary Astrophysics, Instrumentation and Methods for Astrophysics

The James Webb Interferometer: Space-based interferometric detections of PDS 70 b and c at 4.8 μm

19 April 2024 by Dori Blakely and others at

ASTRON

Earth and Planetary Astrophysics

High-precision atmospheric characterization of a Y dwarf with JWST NIRSpec G395H spectroscopy: isotopologue, C/O ratio, metallicity, and the abundances of six molecular species

8 February 2024 by Ben W. P. Lew and others at

Arizona State University

Earth and Planetary Astrophysics, Solar and Stellar Astrophysics

A First Look with JWST Aperture Masking Interferometry (AMI): Resolving Circumstellar Dust around the Wolf-Rayet Binary WR 137 beyond the Rayleigh Limit

22 December 2023 by Ryan Lau and others

Solar and Stellar Astrophysics, Earth and Planetary Astrophysics

Evaluating the GeoSnap 13-μm Cut-Off HgCdTe Detector for mid-IR ground-based astronomy

13 July 2023 by Jarron Leisenring and others

Instrumentation and Methods for Astrophysics, Instrumentation and Detectors

Detecting Exoplanets Closer to Stars with Moderate Spectral Resolution Integral-Field Spectroscopy

17 May 2023 by Shubh Agrawal and others

Earth and Planetary Astrophysics, Instrumentation and Methods for Astrophysics

JWST/NIRCam discovery of the first Y+Y brown dwarf binary: WISE J033605.05-014350.4

29 March 2023 by Per Calissendorff and others

Solar and Stellar Astrophysics, Earth and Planetary Astrophysics

JWST Observations of the Enigmatic Y Dwarf WISE 1828+2650: I. Limits to a Binary Companion

24 February 2023 by Matthew Furio and others

Solar and Stellar Astrophysics, Earth and Planetary Astrophysics

Testing the Interaction Between a Substellar Companion and a Debris Disk in the HR 2562 System

9 February 2023 by Stella Yimiao Zhang and others

Earth and Planetary Astrophysics

First Observations of the Brown Dwarf HD 19467 B with JWST

26 January 2023 by Alexandra Greenbaum and others

Solar and Stellar Astrophysics, Earth and Planetary Astrophysics

The Near Infrared Imager and Slitless Spectrograph for the James Webb Space Telescope -- IV. Aperture Masking Interferometry

7 November 2022 by Anand Sivaramakrishnan and others

Instrumentation and Methods for Astrophysics

The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems I: High Contrast Imaging of the Exoplanet HIP 65426 b from 2-16 μm

1 September 2022 by Aarynn Carter and others

Earth and Planetary Astrophysics

Atmospheric Monitoring and Precise Spectroscopy of the HR 8799 Planets with SCExAO/CHARIS

10 August 2022 by Jason Wang and others

Earth and Planetary Astrophysics

Gemini-LIGHTS: Herbig Ae/Be and massive T-Tauri protoplanetary disks imaged with Gemini Planet Imager

12 June 2022 by Evan Rich and others

Earth and Planetary Astrophysics, Solar and Stellar Astrophysics

Point Source Localization with a Planar Optical Phased Array Compressive Sensor

15 July 2021 by Julian Brown and others at

MIT

Applied Physics, Optics

Debris Disk Results from the Gemini Planet Imager Exoplanet Survey's Polarimetric Imaging Campaign

24 June 2020 by Thomas Esposito and others

Earth and Planetary Astrophysics, Instrumentation and Methods for Astrophysics

Multiband Polarimetric Imaging of HR 4796A with the Gemini Planet Imager

11 June 2020 by Pauline Arriaga and others at

Arizona State University

Earth and Planetary Astrophysics, Instrumentation and Methods for Astrophysics

The Gemini Planet Imager view of the HD 32297 debris disk

13 April 2020 by Gaspard Duchene and others

Solar and Stellar Astrophysics, Earth and Planetary Astrophysics

Revised Astrometric Calibration of the Gemini Planet Imager

8 April 2020 by Robert J. De Rosa and others

Instrumentation and Methods for Astrophysics

HD 165054: an astrometric calibration field for high-contrast imagers in Baade's Window

6 April 2020 by Meiji Nguyen and others

Instrumentation and Methods for Astrophysics, Earth and Planetary Astrophysics

The Gemini Planet Imager Exoplanet Survey: Dynamical Mass of the Exoplanet beta Pictoris b from Combined Direct Imaging and Astrometry

25 November 2019 by Eric Nielsen and others

Earth and Planetary Astrophysics, Solar and Stellar Astrophysics

First Resolved Scattered-Light Images of Four Debris Disks in Scorpius-Centaurus with the Gemini Planet Imager

21 November 2019 by Justin Hom and others

Earth and Planetary Astrophysics, Solar and Stellar Astrophysics

Detection of a low-mass stellar companion to the accelerating A2IV star HR 1645

22 October 2019 by Robert J. De Rosa and others

Solar and Stellar Astrophysics, Earth and Planetary Astrophysics

An updated visual orbit of the directly-imaged exoplanet 51 Eridani b and prospects for a dynamical mass measurement with Gaia

22 October 2019 by Robert J. De Rosa and others

Earth and Planetary Astrophysics

Asymmetries in adaptive optics point spread functions

27 September 2019 by Alexander Madurowicz and others

Instrumentation and Methods for Astrophysics, Earth and Planetary Astrophysics

An Exo-Kuiper Belt and An Extended Halo around HD 191089 in Scattered Light

31 July 2019 by Bin Ren and others

Earth and Planetary Astrophysics, Solar and Stellar Astrophysics

Performance of the Gemini Planet Imager Non-Redundant Mask and spectroscopy of two close-separation binaries HR 2690 and HD 142527

18 April 2019 by Alexandra Greenbaum and others

Instrumentation and Methods for Astrophysics

The Gemini Planet Imager Exoplanet Survey: Giant Planet and Brown Dwarf Demographics From 10-100 AU

10 April 2019 by Eric Nielsen and others

Earth and Planetary Astrophysics

Dynamical Constraints on the HR 8799 Planets with GPI

11 September 2018 by Jason Wang and others

Earth and Planetary Astrophysics

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Earth and Planetary Astrophysics Instrumentation and Methods for Astrophysics Solar and Stellar Astrophysics Instrumentation and Detectors Applied Physics Optics