Awesome SOSS: Transmission Spectroscopy of WASP-96b with NIRISS/SOSS

The future is now - after its long-awaited launch in December 2021, JWST began science operations in July 2022 and is already revolutionizing exoplanet astronomy. The Early Release Observations (ERO) program was designed to provide the first images and spectra from JWST, covering a multitude of scie...

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Veröffentlicht in:arXiv.org 2023-06
Hauptverfasser: Radica, Michael, Welbanks, Luis, Espinoza, Néstor, Taylor, Jake, Coulombe, Louis-Philippe, Feinstein, Adina D, Goyal, Jayesh, Scarsdale, Nicholas, Albert, Loic, Baghel, Priyanka, Bean, Jacob L, Blecic, Jasmina, Lafrenière, David, MacDonald, Ryan J, Zamyatina, Maria, Allart, Romain, Artigau, Étienne, Batalha, Natasha E, Cook, Neil James, Cowan, Nicolas B, Dang, Lisa, Doyon, René, Fournier-Tondreau, Marylou, Johnstone, Doug, Line, Michael R, Moran, Sarah E, Mukherjee, Sagnick, Pelletier, Stefan, Pierre-Alexis, Roy, Talens, Geert Jan, Filippazzo, Joseph, Pontoppidan, Klaus, Volk, Kevin
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creator Radica, Michael
Welbanks, Luis
Espinoza, Néstor
Taylor, Jake
Coulombe, Louis-Philippe
Feinstein, Adina D
Goyal, Jayesh
Scarsdale, Nicholas
Albert, Loic
Baghel, Priyanka
Bean, Jacob L
Blecic, Jasmina
Lafrenière, David
MacDonald, Ryan J
Zamyatina, Maria
Allart, Romain
Artigau, Étienne
Batalha, Natasha E
Cook, Neil James
Cowan, Nicolas B
Dang, Lisa
Doyon, René
Fournier-Tondreau, Marylou
Johnstone, Doug
Line, Michael R
Moran, Sarah E
Mukherjee, Sagnick
Pelletier, Stefan
Pierre-Alexis, Roy
Talens, Geert Jan
Filippazzo, Joseph
Pontoppidan, Klaus
Volk, Kevin
description The future is now - after its long-awaited launch in December 2021, JWST began science operations in July 2022 and is already revolutionizing exoplanet astronomy. The Early Release Observations (ERO) program 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-96b with the Single Object Slitless Spectroscopy (SOSS) mode of the Near Infrared Imager and Slitless Spectrograph, observed as part of the ERO program. 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 1x and 5x solar, and a solar carbon-to-oxygen ratio. Moreover, our models indicate that no grey cloud deck is required to fit WASP-96b's transmission spectrum, but find evidence for a slope shortward of 0.9\(\mu\)m, 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.
doi_str_mv 10.48550/arxiv.2305.17001
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subjects Astronomy
Atmospheric models
Background noise
Data reduction
Extrasolar planets
Metallicity
Near infrared radiation
Physics - Earth and Planetary Astrophysics
Rayleigh scattering
Spectroscopy
Spectrum analysis
title Awesome SOSS: Transmission Spectroscopy of WASP-96b with NIRISS/SOSS
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