TY - JOUR
T1 - Awesome SOSS
T2 - Transmission spectroscopy of WASP-96b with NIRISS/SOSS
AU - Radica, Michael
AU - Welbanks, Luis
AU - Espinoza, Nestor
AU - Taylor, Jake
AU - Coulombe, Louis Philippe
AU - Feinstein, Adina D.
AU - Goyal, Jayesh
AU - Scarsdale, Nicholas
AU - Albert, Loïc
AU - Baghel, Priyanka
AU - Bean, Jacob L.
AU - Blecic, Jasmina
AU - Lafrenière, David
AU - Macdonald, Ryan J.
AU - Zamyatina, Maria
AU - Allart1, Romain
AU - Artigau, Étienne
AU - Batalha, Natasha E.
AU - Cook, Neil James
AU - Cowan, Nicolas B.
AU - Dang, Lisa
AU - Doyon, Rene
AU - Fournier-Tondreau, Marylou
AU - Johnstone, Doug
AU - Line, Michael R.
AU - Moran, Sarah E.
AU - Mukherjee, Sagnick
AU - Pelletier, Stefan
AU - Roy, Pierre Alexis
AU - Talens, Geert Jan
AU - Filippazzo, Joseph
AU - Pontoppidan, Klaus
AU - Volk, Kevin
N1 - Publisher Copyright:
© 2023 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.
PY - 2023/9/1
Y1 - 2023/9/1
N2 - The future is now - after its long-awaited launch in 2021 December, JWST began science operations in 2022 July and is already revolutionizing exoplanet astronomy. The Early Release Observations (ERO) programme was designed to provide the first images and spectra from JWST, covering a multitude of science cases and using multiple modes of each on-board instrument. Here, we present transmission spectroscopy observations of the hot-Saturn WASP-96 b with the Single Object Slitless Spectroscopy (SOSS) mode of the Near Infrared Imager and Slitless Spectrograph, observed as part of the ERO programme. As the SOSS mode presents some unique data reduction challenges, we provide an in-depth walk-through of the major steps necessary for the reduction of SOSS data: including background subtraction, correction of 1/f noise, and treatment of the trace order overlap. We furthermore offer potential routes to correct for field star contamination, which can occur due to the SOSS mode's slitless nature. By comparing our extracted transmission spectrum with grids of atmosphere models, we find an atmosphere metallicity between 1× and 5× solar, and a solar carbon-to-oxygen ratio. Moreover, our models indicate that no grey cloud deck is required to fit WASP-96 b's transmission spectrum, but find evidence for a slope shortward of 0.9 μm, which could either be caused by enhanced Rayleigh scattering or the red wing of a pressure-broadened Na feature. Our work demonstrates the unique capabilities of the SOSS mode for exoplanet transmission spectroscopy and presents a step-by-step reduction guide for this new and exciting instrument.
AB - The future is now - after its long-awaited launch in 2021 December, JWST began science operations in 2022 July and is already revolutionizing exoplanet astronomy. The Early Release Observations (ERO) programme was designed to provide the first images and spectra from JWST, covering a multitude of science cases and using multiple modes of each on-board instrument. Here, we present transmission spectroscopy observations of the hot-Saturn WASP-96 b with the Single Object Slitless Spectroscopy (SOSS) mode of the Near Infrared Imager and Slitless Spectrograph, observed as part of the ERO programme. As the SOSS mode presents some unique data reduction challenges, we provide an in-depth walk-through of the major steps necessary for the reduction of SOSS data: including background subtraction, correction of 1/f noise, and treatment of the trace order overlap. We furthermore offer potential routes to correct for field star contamination, which can occur due to the SOSS mode's slitless nature. By comparing our extracted transmission spectrum with grids of atmosphere models, we find an atmosphere metallicity between 1× and 5× solar, and a solar carbon-to-oxygen ratio. Moreover, our models indicate that no grey cloud deck is required to fit WASP-96 b's transmission spectrum, but find evidence for a slope shortward of 0.9 μm, which could either be caused by enhanced Rayleigh scattering or the red wing of a pressure-broadened Na feature. Our work demonstrates the unique capabilities of the SOSS mode for exoplanet transmission spectroscopy and presents a step-by-step reduction guide for this new and exciting instrument.
KW - methods: data analysis
KW - planets and satellites: atmospheres
KW - planets and satellites: gaseous planets
KW - planets and satellites: individual: WASP-96 b
KW - techniques: spectroscopic
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U2 - 10.1093/mnras/stad1762
DO - 10.1093/mnras/stad1762
M3 - Article
AN - SCOPUS:85166045757
SN - 0035-8711
VL - 524
SP - 835
EP - 856
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 1
ER -