Spectroscopic time series performance of the Mid-Infrared Instrument on the JWST - Observatoire de Paris Access content directly
Preprints, Working Papers, ... Year : 2022

Spectroscopic time series performance of the Mid-Infrared Instrument on the JWST

Jeroen Bouwman
  • Function : Author
Sarah Kendrew
  • Function : Author
Thomas P. Greene
  • Function : Author
Taylor J. Bell
  • Function : Author
Pierre-Olivier Lagage
  • Function : Author
Juergen Schreiber
  • Function : Author
Daniel Dicken
  • Function : Author
G. C. Sloan
  • Function : Author
Nestor Espinoza
  • Function : Author
Silvia Scheithauer
  • Function : Author
Ori D. Fox
  • Function : Author
Rene Gastaud
  • Function : Author
Adrian M. Glauser
  • Function : Author
Olivia C. Jones
  • Function : Author
Alvaro Labiano
  • Function : Author
Fred Lahuis
  • Function : Author
Jane E. Morrison
  • Function : Author
Katherine Murray
  • Function : Author
Michael Mueller
  • Function : Author
Omnarayani Nayak
  • Function : Author
Gillian S. Wright
  • Function : Author
Alistair Glasse
  • Function : Author
George Rieke
  • Function : Author

Abstract

We present here the first ever mid-infrared spectroscopic time series observation of the transiting exoplanet \object{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 these challenging observations. To assess the MIRI LRS performance, we performed two independent analyses of the data. We find that with a single transit observation we reached a spectro-photometric precision of $\sim$50 ppm in the 7-8~\micron~range at R=50, consistent with $\sim$25 ppm systematic noise. The derived band averaged transit depth is 524~$\pm$~15~ppm and 547~$\pm$~13~ppm for the two applied analysis methods, respectively, recovering the known transit depth to within 1~$\sigma$. The measured noise in the planet's transmission spectrum is approximately 15-20\% higher than random noise simulations over wavelengths $6.8 \lesssim \lambda \lesssim 11$ $\mu$m. We observed an excess noise at shorter wavelengths, for which possible causes are discussed. This performance was achieved with limited in-flight calibration data, demonstrating the future potential of MIRI for the characterization of exoplanet atmospheres.

Dates and versions

obspm-03994869 , version 1 (17-02-2023)

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Jeroen Bouwman, Sarah Kendrew, Thomas P. Greene, Taylor J. Bell, Pierre-Olivier Lagage, et al.. Spectroscopic time series performance of the Mid-Infrared Instrument on the JWST. 2023. ⟨obspm-03994869⟩
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