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Spectroscopic Time Series Performance of the Mid-infrared Instrument on the JWST

Espinoza, Néstor; Bell, Taylor J.; Bouwman, Jeroen +21 more

We present here the first ever mid-infrared spectroscopic time series observation of the transiting exoplanet L 168-9 b with the Mid-Infrared Instrument (MIRI) on the James Webb Space Telescope. The data were obtained as part of the MIRI commissioning activities, to characterize the performance of the Low Resolution Spectroscopy (LRS) mode for the…

Spectroscopic Time-series Performance of JWST/NIRSpec from Commissioning Observations

Nikolov, Nikolay; Sing, David K.; Böker, Torsten +22 more

We report on James Webb Space Telescope (JWST) commissioning observations of the transiting exoplanet HAT-P-14 b, obtained using the Bright Object Time Series (BOTS) mode of the NIRSpec instrument with the G395H/F290LP grating/filter combination (3-5 µm). While the data were used primarily to verify that the NIRSpec BOTS mode is working as e…

JWST NIRCam Defocused Imaging: Photometric Stability Performance and How It Can Sense Mirror Tilts

Gennaro, Mario; Espinoza, Néstor; Perrin, Marshall D. +25 more

We use JWST NIRCam short-wavelength photometry to capture a transit lightcurve of the exoplanet HAT-P-14 b to assess performance as part of instrument commissioning. The short-wavelength precision is 152 ppm per 27 s integration as measured over the full time series compared to a theoretical limit of 107 ppm, after corrections to spatially correla…

The Near Infrared Imager and Slitless Spectrograph for JWST. V. Kernel Phase Imaging and Data Analysis

Willott, Chris J.; Noirot, Gaël; Mérand, Antoine +26 more

Kernel phase imaging (KPI) enables the direct detection of substellar companions and circumstellar dust close to and below the classical (Rayleigh) diffraction limit. The high-Strehl full pupil images provided by the James Webb Space Telescope (JWST) are ideal for application of the KPI technique. We present a kernel phase analysis of JWST NIRISS …