JWST-TST DREAMS: A Precise Water Abundance for Hot Jupiter WASP-17b from the NIRISS SOSS Transmission Spectrum
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| author | Louie, Dana R. Mullens, Elijah Alderson, Lili Glidden, Ana Lewis, Nikole K. Wakeford, Hannah R. Batalha, Natasha E. Colón, Knicole D. Gressier, Amélie Long, Douglas Radica, Michael Espinoza, Néstor Goyal, Jayesh MacDonald, Ryan J. May, Erin M. Seager, Sara Stevenson, Kevin B. Valenti, Jeff A. Allen, Natalie H. Cañas, Caleb I. Challener, Ryan C. Grant, David Huang, Jingcheng Lin, Zifan Valentine, Daniel Clampin, Mark Perrin, Marshall Pueyo, Laurent van der Marel, Roeland P. Mountain, C. Matt |
| author_facet | Louie, Dana R. Mullens, Elijah Alderson, Lili Glidden, Ana Lewis, Nikole K. Wakeford, Hannah R. Batalha, Natasha E. Colón, Knicole D. Gressier, Amélie Long, Douglas Radica, Michael Espinoza, Néstor Goyal, Jayesh MacDonald, Ryan J. May, Erin M. Seager, Sara Stevenson, Kevin B. Valenti, Jeff A. Allen, Natalie H. Cañas, Caleb I. Challener, Ryan C. Grant, David Huang, Jingcheng Lin, Zifan Valentine, Daniel Clampin, Mark Perrin, Marshall Pueyo, Laurent van der Marel, Roeland P. Mountain, C. Matt |
| contents | Water has proven to be ubiquitously detected in near-infrared (NIR) transmission spectroscopy observations of hot Jupiter atmospheres, including WASP-17b. However, previous analyses of WASP-17b's atmosphere based upon Hubble Space Telescope (HST) and Spitzer data could not constrain the water abundance, finding that sub-solar, super-solar and bimodal posterior distributions were all statistically valid. In this work, we observe one transit of the hot Jupiter WASP-17b using JWST's Near Infrared Imager and Slitless Spectrograph Single Object Slitless Spectroscopy (NIRISS SOSS) mode. We analyze our data using three independent data analysis pipelines, finding excellent agreement between results. Our transmission spectrum shows multiple H$_2$O absorption features and a flatter slope towards the optical than seen in previous HST observations. We analyze our spectrum using both PICASO+Virga forward models and free retrievals. POSEIDON retrievals provide a well-constrained super-solar $\log$(H$_2$O) abundance (-2.96$^{+0.31}_{-0.24}$), breaking the degeneracy from the previous HST/Spitzer analysis. We verify our POSEIDON results with petitRADTRANS retrievals. Additionally, we constrain the abundance of $\log$(H$^-$), -10.19$^{+0.30}_{-0.23}$, finding that our model including H$^-$ is preferred over our model without H$^-$ to 5.1 $σ$. Furthermore, we constrain the $\log$(K) abundance (-8.07$^{+0.58}_{-0.52}$) in WASP-17b's atmosphere for the first time using space-based observations. Our abundance constraints demonstrate the power of NIRISS SOSS's increased resolution, precision, and wavelength range to improve upon previous NIR space-based results. This work is part of a series of studies by our JWST Telescope Scientist Team (JWST-TST), in which we use Guaranteed Time Observations to perform Deep Reconnaissance of Exoplanet Atmospheres through Multi-instrument Spectroscopy (DREAMS). |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_03675 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | JWST-TST DREAMS: A Precise Water Abundance for Hot Jupiter WASP-17b from the NIRISS SOSS Transmission Spectrum Louie, Dana R. Mullens, Elijah Alderson, Lili Glidden, Ana Lewis, Nikole K. Wakeford, Hannah R. Batalha, Natasha E. Colón, Knicole D. Gressier, Amélie Long, Douglas Radica, Michael Espinoza, Néstor Goyal, Jayesh MacDonald, Ryan J. May, Erin M. Seager, Sara Stevenson, Kevin B. Valenti, Jeff A. Allen, Natalie H. Cañas, Caleb I. Challener, Ryan C. Grant, David Huang, Jingcheng Lin, Zifan Valentine, Daniel Clampin, Mark Perrin, Marshall Pueyo, Laurent van der Marel, Roeland P. Mountain, C. Matt Earth and Planetary Astrophysics Water has proven to be ubiquitously detected in near-infrared (NIR) transmission spectroscopy observations of hot Jupiter atmospheres, including WASP-17b. However, previous analyses of WASP-17b's atmosphere based upon Hubble Space Telescope (HST) and Spitzer data could not constrain the water abundance, finding that sub-solar, super-solar and bimodal posterior distributions were all statistically valid. In this work, we observe one transit of the hot Jupiter WASP-17b using JWST's Near Infrared Imager and Slitless Spectrograph Single Object Slitless Spectroscopy (NIRISS SOSS) mode. We analyze our data using three independent data analysis pipelines, finding excellent agreement between results. Our transmission spectrum shows multiple H$_2$O absorption features and a flatter slope towards the optical than seen in previous HST observations. We analyze our spectrum using both PICASO+Virga forward models and free retrievals. POSEIDON retrievals provide a well-constrained super-solar $\log$(H$_2$O) abundance (-2.96$^{+0.31}_{-0.24}$), breaking the degeneracy from the previous HST/Spitzer analysis. We verify our POSEIDON results with petitRADTRANS retrievals. Additionally, we constrain the abundance of $\log$(H$^-$), -10.19$^{+0.30}_{-0.23}$, finding that our model including H$^-$ is preferred over our model without H$^-$ to 5.1 $σ$. Furthermore, we constrain the $\log$(K) abundance (-8.07$^{+0.58}_{-0.52}$) in WASP-17b's atmosphere for the first time using space-based observations. Our abundance constraints demonstrate the power of NIRISS SOSS's increased resolution, precision, and wavelength range to improve upon previous NIR space-based results. This work is part of a series of studies by our JWST Telescope Scientist Team (JWST-TST), in which we use Guaranteed Time Observations to perform Deep Reconnaissance of Exoplanet Atmospheres through Multi-instrument Spectroscopy (DREAMS). |
| title | JWST-TST DREAMS: A Precise Water Abundance for Hot Jupiter WASP-17b from the NIRISS SOSS Transmission Spectrum |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2412.03675 |