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

Abstract

The Gemini Planet Imager (GPI) contains a 10-hole non-redundant mask (NRM), enabling interferometric resolution in complement to its coronagraphic capabilities. The NRM operates both in spectroscopic (integral field spectrograph, henceforth IFS) and polarimetric configurations. NRM observations were taken between 2013 and 2016 to characterize its performance. Most observations were taken in spectroscopic mode with the goal of obtaining precise astrometry and spectroscopy of faint companions to bright stars. We find a clear correlation between residual wavefront error measured by the AO system and the contrast sensitivity by comparing phase errors in observations of the same source, taken on different dates. We find a typical 5-$\sigma$ contrast sensitivity of $2-3\times 10^{-3}$ at $\sim \lambda /D$. We explore the accuracy of spectral extraction of secondary components of binary systems by recovering the signal from a simulated source injected into several datasets. We outline data reduction procedures unique to GPI's IFS and describe a newly public data pipeline used for the presented analyses. We demonstrate recovery of astrometry and spectroscopy of two known companions to HR 2690 and HD 142527. NRM+polarimetry observations achieve differential visibility precision of $\sigma \sim 0.4\%$ in the best case. We discuss its limitations on Gemini-S/GPI for resolving inner regions of protoplanetary disks and prospects for future upgrades. We summarize lessons learned in observing with NRM in spectroscopic and polarimetric modes.

arXiv commentAccepted to AJ, 22 pages, 14 figures

References in corpus (44)

• Astropy: A Community Python Package for Astronomy
• emcee: The MCMC Hammer
• The NumPy array: a structure for efficient numerical computation
• Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties
• Evolutionary models for cool brown dwarfs and extrasolar giant planets. The case of HD 20945
• Angular Differential Imaging: a Powerful High-Contrast Imaging Technique
• The Gemini Planet Imager: First Light
• Southern Massive Stars at High Angular Resolution: Observational Campaign and Companion Detection
• Monte Carlo radiative transfer in protoplanetary disks
• Accretion in Brown Dwarfs: an Infrared View
• Benchmark problems for continuum radiative transfer. High optical depths, anisotropic scattering, and polarisation
• LkCa 15: A Young Exoplanet Caught at Formation?
• Accreting Protoplanets in the LkCa 15 Transition Disk
• A dusty pinwheel nebula around the massive star WR 104
• Speckle interferometry at SOAR in 2012 and 2013
• Mapping the Shores of the Brown Dwarf Desert I.: Upper Scorpius
• Polarimetry with the Gemini Planet Imager: Methods, Performance at First Light, and the Circumstellar Ring around HR 4796A
• A close halo of large transparent grains around extreme red giant stars
• X-shooter spectroscopy of young stellar objects: I - Mass accretion rates of low-mass T Tauri stars in σOrionis
• A Likely Close-In Low-Mass Stellar Companion to the Transitional Disk Star HD 142527
• Michelson Interferometry with the Keck I Telescope
• Discovery of H-alpha Emission from the Close Companion Inside the Gap of Transitional Disk HD142527
• Kernel-Phase in Fizeau Inteferometry
• Speckle interferometry at SOAR in 2014
• An M-dwarf star in the transition disk of Herbig HD 142527; Physical parameters and orbital elements
• Sparse aperture masking at the VLT I. Faint companion detection limits for the two debris disk stars HD 92945 and HD 141569
• Phase Errors in Diffraction-Limited Imaging: Contrast Limits for Sparse Aperture Masking
• The VAMPIRES instrument: Imaging the innermost regions of protoplanetary disks with polarimetric interferometry
• Astrometric Confirmation and Preliminary Orbital Parameters of the Young Exoplanet 51 Eridani b with the Gemini Planet Imager
• Gemini Planet Imager Observational Calibrations I: Overview of the GPI Data Reduction Pipeline
• Gemini Planet Imager Observational Calibrations V: Astrometry and Distortion
• Dynamical Masses of Young Stars I: Discordant Model Ages of Upper Scorpius
• Speckle interferometry at SOAR in 2015
• Is stellar multiplicity universal? Tight stellar binaries in the Orion Nebula Cluster
• The Gemini NICI Planet-Finding Campaign
• Dynamical Mass Measurement of the Young Spectroscopic Binary V343 Normae AaAb Resolved With the Gemini Planet Imager
• An image-plane algorithm for JWST's non-redundant aperture mask data
• Gemini Planet Imager Observational Calibrations IV: Wavelength Calibration and Flexure Correction for the Integral Field Spectrograph
• Characterization of low-mass companion HD 142527 B
• Status and performance of the Gemini Planet Imager adaptive optics system
• New Spatially Resolved Observations of the T Cha Transition Disk and Constraints on the Previously Claimed Substellar Companion
• Near-IR imaging of T Cha: evidence for scattered-light disk structures at solar system scales
• Sparse aperture masking at the VLT II. Detection limits for the eight debris disks stars $\beta$ Pic, AU Mic, 49 Cet, $\eta$ Tel, Fomalhaut, g Lup, HD181327 and HR8799
• Gemini Planet imager Observational Calibrations X: Non-Redundant Masking on GPI

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