AAS 241 JWST Exoplanet ERS Results

The results of a transit of the exoplanet WASP-39b with JWST NIRISS/SOSS. This work was part of the JWST Early Release Science Program (PI Batalha).

Affiliated publication: https://www.nature.com/articles/s41586-022-05674-1

Affiliated data products: https://zenodo.org/communities/ers-transit?page=1&size=20

Transcript

1. Adina Feinstein, Michael Radica, Luis Welbanks, Catriona Murray, Kazumasa Ohno, Louis-Philippe Coulombe, Néstor Espinoza, Jacob Bean, Johanna Teske, Björn Benneke, Michael Line, + 80 co-authors The Transmission Spectrum of WASP-39b with NIRISS/SOSS JWST Transiting Exoplanet Early Release Science Team Presents: 1 arXiv: 2211.10493 AAS 241, January 9 Early Transiting Exoplanet Science with JWST
2. 2 A brief overview of the NIRISS/SOSS detector: three spectral traces & a handful of background contaminants
3. 2 A brief overview of the NIRISS/SOSS detector: three spectral traces & a handful of background contaminants Order 1 Order 2 Order 3
4. 2 A brief overview of the NIRISS/SOSS detector: three spectral traces & a handful of background contaminants
5. 2 A brief overview of the NIRISS/SOSS detector: three spectral traces & a handful of background contaminants
6. 3 LC Fitting for nirHiss: Catriona Murray w/ chromatic_fitting We generated white & spectroscopic light curves, and fit each one with a combination of transit + out-of- transit polynomial. nirHiss supreme-SPOON NAMELESS transitspectroscopy iraclis FIREFly
7. We generated transmission spectra using 6 independent reduction pipelines. 4 Transmission spectra from (from left to right): Adina Feinstein, Michael Radica, Néstor Espinoza, Angelos Tsiaras, Zafar Rustamkulov, & Louis-Philippe Coulombe nirHiss transitspectroscopy NAMELESS FIREFly iraclis supreme-SPOON
8. We generated transmission spectra using 6 independent reduction pipelines. 4 Transmission spectra from (from left to right): Adina Feinstein, Michael Radica, Néstor Espinoza, Angelos Tsiaras, Zafar Rustamkulov, & Louis-Philippe Coulombe nirHiss transitspectroscopy NAMELESS FIREFly iraclis supreme-SPOON HST (Wakeford+18)
9. We focused our analysis on the nirHiss spectrum. 5 Transmission spectra from (from left to right): Adina Feinstein, Michael Radica, Néstor Espinoza, Angelos Tsiaras, Zafar Rustamkulov, & Louis-Philippe Coulombe nirHiss
10. 6 Model Generation & Fitting: Kazumasa Ohno While cloudy models generally fit the spectra well, neither the PICASO, ATMO, nor PHOENIX models could fit the shallow transit depth at > 2μm.
11. 6 Model Generation & Fitting: Kazumasa Ohno While cloudy models generally fit the spectra well, neither the PICASO, ATMO, nor PHOENIX models could fit the shallow transit depth at > 2μm.
12. 7 Model Generation & Fitting: Luis Welbanks w/ ScChimera By invoking inhomogeneous cloud coverage along the terminator, we’re able to better fit the spectrum. ɸnon-grey ɸclear
13. 8 Model Generation & Fitting: Luis Welbanks w/ ScChimera -1.0 0.0 0.2 0.4 0.6 0.8 1.0 [K/O] R ~ 300 R ~ 870 We resolve the potassium absorption feature at ~0.77μm, which was hinted at in previous HST data.
14. Summary of WASP-39b NIRISS/SOSS results 9 afeinstein@uchicago.edu • We explored various methods and combinations of background subtraction, decontaminating the spectral orders, and removing 0th order contaminants to produce high-fidelity spectra. • We found that inhomogeneous flux-balanced cloud models are able to best fit the entire spectrum from 0.6-2.8μm. • All 6 reductions are in relatively good agreement with the best-fit model to the nirHiss data. • The previous tentative detection of potassium from HST was further confirmed in the new NIRISS/SOSS observations. • Be sure to check out our paper for more details on the methods 
 arXiv: 2211.10493 and the ERS Zenodo for all of our data products!