Home Science Early Release Science Of The Exoplanet WASP-39b With JWST NIRISS

Early Release Science Of The Exoplanet WASP-39b With JWST NIRISS

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Interpretation of the components of the NIRISS WASP-39b transmission spectrum. (a/b): The upper panel shows a comparison of transmission spectra of WASP-39b from nirHiss reduction (grey dots) against the best-fit reference model (black line). Each colored line removes key constituents found in the best-fit reference model to show how the spectrum would change if these features were not included. The removal of clouds from the reference model and the absorption of H2O significantly change the shape and depth of the transmission spectrum. Other sources of opacity that affect the spectrum are K, CO, and CO2. The residuals between the data and the reference model are plotted below. (c/d): The bottom two panels show the molecular absorption cross sections of a selection of gases observable within the NIRISS bandpass. The middle panel highlights gases inferred by analysis of the spectrum of WASP-39b. The bottom panel highlights several gases not identified in these data but that may be present in future observations of other exoplanets. (https://github.com/afeinstein20/wasp39b_niriss_paper/blob/main/scripts/figure3.py) — Astro-ph.EP

Transmission spectroscopy provides insight into the properties of the atmosphere and, consequently, the formation history, physics and chemistry of transiting exoplanets. However, obtaining accurate estimates of atmospheric properties from transmission spectra requires simultaneous measurements of the intensity and shape of multiple spectral absorption features from a wide range of chemical species.

This was difficult given the accuracy and wavelength range of previous observatories. Here we present a transmission spectrum of the Saturn-mass exoplanet WASP-39b obtained using the SOSS mode of her NIRISS instrument at JWST.

The spectrum spans wavelengths from 0.6 to 2.8 μm and reveals multiple water absorption bands, potassium resonance doublets, and cloud features. The accuracy and wide wavelength range of NIRISS-SOSS can break the model degeneracy between cloud properties and WASP-39b atmospheric composition, yielding heavy element enhancements (“metal ) takes precedence. -Solar Carbon to Oxygen (C/O) ratio, and Solar to Supersolar Potassium to Oxygen (K/O) ratio.

The observations are best explained by the wavelength-dependent non-grey clouds that unevenly cover the planetary terminator.

Adina D. Feinstein, Michael Radica, Louis Wellbanks, Catriona Anne Murray, Kazumasa Ohno, Louis-Philippe Courombes, Nestor Espinoza, Jacob L. Biehn, Johanna K. Teske, Bjorn Beneke, Michael R. Line, Zafar Rustamkulov, Ariana Saba, Angelos Tsiaras, Joanna K. Barstow, Jonathan J. Fortney, Peter Gao, Heather A. Knutson, Ryan J. MacDonald, Thomas Mikal-Evans, Benjamin V. Rackham, Jake Taylor, Vivien Parmentier, Natalie M. Batalha, Zachory K. Bertha-Thompson, Arlyn L. Carter, Quentin Changeatt, Leonardo A. Dos Santos, Neil P. Gibson, Jaish M. Goyal , Laura Clydeberg, Mercedes Lopez Morales, Joshua D. Rotringer, Yamira Miguel, Karan Moraverdikani, Sarah E. Moran, Giuseppe Morello, Sagnick Mukherjee, David K. Sing, Kevin B. Stevenson, Hannah R. Wakeford, Eva-Maria Ahler, Munazza K. Aram, Lili Alderson, Natalie H. Allen, Natasha E. Batalha, Taylor J. Bell, Jasmina Bresic , Jonathan Brande, Claudio Caceres, SL Casewell, Katie L. Chubb, Ian JM Crosfield, Nicolas Kruse, Patricio E. Cuviros, Leanne Decin, Jean-Michel Désert, Joseph Harrington, Kevin Heng, Thomas Henning, Nicolas Iro, Eliza M.-R. Kempton, Sarah Kendrew, James Kirk, Jessica Crick, Pierre-Olivier Lagage, Monica Lendl, Luigi Mancini, Megan Mansfield, EM May, NJ Main, Nikolai K. Nikoloff , Enric Paré, Dominique J.M. Petit Di La Roche, Caroline Piole, Diana Powell, Seth Redfield, LawLa K. Rogers, Michael T. Roman, Pierre-Alexis Roy, Matthew C. Nixon, Everett Schlawin, Xianyu Tang, P. Tremblin, Jake D. Turner, Olivia Vennott, William C. Wolkes, Peter J. Wheatley, Shi Chang

Comments: Page 48, Figure 12, Table 2. Under review by Nature
Subjects: Earth and Planetary Astrophysics (astro-ph.EP); Instruments and Methods for Astrophysics (astro-ph.IM); Solar and Star Astrophysics (astro-ph.SR)
Quoted as: arXiv:2211.10493 [astro-ph.EP] (or arXiv:2211.10493v1 [astro-ph.EP] for this version)
Submission history
From: Adina Feinstein
[v1] Fri, Nov 18, 2022 20:01:34 UTC (7,388 KB)
space biology,

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