Saved in:
| Main Authors: | , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2409.07552 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866912024104009728 |
|---|---|
| author | Scarsdale, Nicholas Wogan, Nicholas Wakeford, Hannah R. Wallack, Nicole L. Batalha, Natasha E. Alderson, Lili Aguichine, Artyom Wolfgang, Angie Teske, Johanna Moran, Sarah E. Lopez-Morales, Mercedes Kirk, James Gordon, Tyler Gao, Peter Batalha, Natalie M. Alam, Munazza K. Redai, Jea Adams |
| author_facet | Scarsdale, Nicholas Wogan, Nicholas Wakeford, Hannah R. Wallack, Nicole L. Batalha, Natasha E. Alderson, Lili Aguichine, Artyom Wolfgang, Angie Teske, Johanna Moran, Sarah E. Lopez-Morales, Mercedes Kirk, James Gordon, Tyler Gao, Peter Batalha, Natalie M. Alam, Munazza K. Redai, Jea Adams |
| contents | We present a JWST NIRSpec transmission spectrum of the super-Earth exoplanet L 98-59 c. This small (R$_p=1.385\pm0.085$R$_\oplus$, M$_p=2.22\pm0.26$R$_\oplus$), warm (T$_\textrm{eq}=553$K) planet resides in a multi-planet system around a nearby, bright (J = 7.933) M3V star. We find that the transmission spectrum of L 98-59 c is featureless at the precision of our data. We achieve precisions of 22ppm in NIRSpec G395H's NRS1 detector and 36ppm in the NRS2 detector at a resolution R$\sim$200 (30 pixel wide bins). At this level of precision, we are able rule out primordial H$_2$-He atmospheres across a range of cloud pressure levels up to at least $\sim$0.1mbar. By comparison to atmospheric forward models, we also rule out atmospheric metallicities below $\sim$300$\times$ solar at 3$σ$ (or equivalently, atmospheric mean molecular weights below $\sim$10~g/mol). We also rule out pure methane atmospheres. The remaining scenarios that are compatible with our data include a planet with no atmosphere at all, or higher mean-molecular weight atmospheres, such as CO$_2$- or H$_2$O-rich atmospheres. This study adds to a growing body of evidence suggesting that planets $\lesssim1.5$R$_\oplus$ lack extended atmospheres. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_07552 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | JWST COMPASS: The 3-5 Micron Transmission Spectrum of the Super-Earth L 98-59 c Scarsdale, Nicholas Wogan, Nicholas Wakeford, Hannah R. Wallack, Nicole L. Batalha, Natasha E. Alderson, Lili Aguichine, Artyom Wolfgang, Angie Teske, Johanna Moran, Sarah E. Lopez-Morales, Mercedes Kirk, James Gordon, Tyler Gao, Peter Batalha, Natalie M. Alam, Munazza K. Redai, Jea Adams Earth and Planetary Astrophysics We present a JWST NIRSpec transmission spectrum of the super-Earth exoplanet L 98-59 c. This small (R$_p=1.385\pm0.085$R$_\oplus$, M$_p=2.22\pm0.26$R$_\oplus$), warm (T$_\textrm{eq}=553$K) planet resides in a multi-planet system around a nearby, bright (J = 7.933) M3V star. We find that the transmission spectrum of L 98-59 c is featureless at the precision of our data. We achieve precisions of 22ppm in NIRSpec G395H's NRS1 detector and 36ppm in the NRS2 detector at a resolution R$\sim$200 (30 pixel wide bins). At this level of precision, we are able rule out primordial H$_2$-He atmospheres across a range of cloud pressure levels up to at least $\sim$0.1mbar. By comparison to atmospheric forward models, we also rule out atmospheric metallicities below $\sim$300$\times$ solar at 3$σ$ (or equivalently, atmospheric mean molecular weights below $\sim$10~g/mol). We also rule out pure methane atmospheres. The remaining scenarios that are compatible with our data include a planet with no atmosphere at all, or higher mean-molecular weight atmospheres, such as CO$_2$- or H$_2$O-rich atmospheres. This study adds to a growing body of evidence suggesting that planets $\lesssim1.5$R$_\oplus$ lack extended atmospheres. |
| title | JWST COMPASS: The 3-5 Micron Transmission Spectrum of the Super-Earth L 98-59 c |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2409.07552 |