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| Natura: | Preprint |
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2023
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2301.10866 |
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| author | Barclay, Thomas Sheppard, Kyle B. Latouf, Natasha Mandell, Avi M. Quintana, Elisa V. Gilbert, Emily A. Liuzzi, Giuliano Villanueva, Geronimo L. Arney, Giada Brande, Jonathan Colón, Knicole D. Covone, Giovanni Crossfield, Ian J. M. Damiano, Mario Domagal-Goldman, Shawn D. Fauchez, Thomas J. Fiscale, Stefano Gallo, Francesco Hedges, Christina L. Hu, Renyu Kite, Edwin S. Koll, Daniel Kopparapu, Ravi K. Kostov, Veselin B. Kreidberg, Laura Lopez, Eric D. Mang, James Morley, Caroline V. Mullally, Fergal Mullally, Susan E. Pidhorodetska, Daria Schlieder, Joshua E. Vega, Laura D. Youngblood, Allison Zieba, Sebastian |
| author_facet | Barclay, Thomas Sheppard, Kyle B. Latouf, Natasha Mandell, Avi M. Quintana, Elisa V. Gilbert, Emily A. Liuzzi, Giuliano Villanueva, Geronimo L. Arney, Giada Brande, Jonathan Colón, Knicole D. Covone, Giovanni Crossfield, Ian J. M. Damiano, Mario Domagal-Goldman, Shawn D. Fauchez, Thomas J. Fiscale, Stefano Gallo, Francesco Hedges, Christina L. Hu, Renyu Kite, Edwin S. Koll, Daniel Kopparapu, Ravi K. Kostov, Veselin B. Kreidberg, Laura Lopez, Eric D. Mang, James Morley, Caroline V. Mullally, Fergal Mullally, Susan E. Pidhorodetska, Daria Schlieder, Joshua E. Vega, Laura D. Youngblood, Allison Zieba, Sebastian |
| contents | We present observations of the 1.35+/-0.07 Earth-radius planet L 98-59 c, collected using Wide Field Camera 3 on the Hubble Space Telescope. L 98-59 is a nearby (10.6 pc), bright (H=7.4 mag), M3V star that harbors three small, transiting planets. As one of the closest known transiting multi-planet systems, L 98-59 offers one of the best opportunities to probe and compare the atmospheres of rocky planets that formed in the same stellar environment. We measured the transmission spectrum of L 98-59 c and the extracted spectrum showed marginal evidence (2.1σ) for wavelength-dependent transit depth variations that could indicate the presence of an atmosphere. We forward-modeled possible atmospheric compositions of the planet based on the transmission spectrum. Although L 98-59 was previously thought to be a fairly quiet star, we have seen evidence for stellar activity, and therefore we assessed a scenario where the source of the signal originates with inhomogeneities on stellar surface. We also see a correlation between transits of L 98-59 c and L 98-59 b collected 12.5 hours apart, which is suggestive (but at <2σ confidence) of a contaminating component from the star impacting the exoplanet spectrum. While intriguing, our results are inconclusive and additional data is needed to verify any atmospheric signal. Fortunately, additional data has been collected from both HST and JWST. Should this result be confirmed with additional data, L 98-59 c would be the first planet smaller than two Earth-radii with a detected atmosphere. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2301_10866 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | The transmission spectrum of the potentially rocky planet L 98-59 c Barclay, Thomas Sheppard, Kyle B. Latouf, Natasha Mandell, Avi M. Quintana, Elisa V. Gilbert, Emily A. Liuzzi, Giuliano Villanueva, Geronimo L. Arney, Giada Brande, Jonathan Colón, Knicole D. Covone, Giovanni Crossfield, Ian J. M. Damiano, Mario Domagal-Goldman, Shawn D. Fauchez, Thomas J. Fiscale, Stefano Gallo, Francesco Hedges, Christina L. Hu, Renyu Kite, Edwin S. Koll, Daniel Kopparapu, Ravi K. Kostov, Veselin B. Kreidberg, Laura Lopez, Eric D. Mang, James Morley, Caroline V. Mullally, Fergal Mullally, Susan E. Pidhorodetska, Daria Schlieder, Joshua E. Vega, Laura D. Youngblood, Allison Zieba, Sebastian Earth and Planetary Astrophysics We present observations of the 1.35+/-0.07 Earth-radius planet L 98-59 c, collected using Wide Field Camera 3 on the Hubble Space Telescope. L 98-59 is a nearby (10.6 pc), bright (H=7.4 mag), M3V star that harbors three small, transiting planets. As one of the closest known transiting multi-planet systems, L 98-59 offers one of the best opportunities to probe and compare the atmospheres of rocky planets that formed in the same stellar environment. We measured the transmission spectrum of L 98-59 c and the extracted spectrum showed marginal evidence (2.1σ) for wavelength-dependent transit depth variations that could indicate the presence of an atmosphere. We forward-modeled possible atmospheric compositions of the planet based on the transmission spectrum. Although L 98-59 was previously thought to be a fairly quiet star, we have seen evidence for stellar activity, and therefore we assessed a scenario where the source of the signal originates with inhomogeneities on stellar surface. We also see a correlation between transits of L 98-59 c and L 98-59 b collected 12.5 hours apart, which is suggestive (but at <2σ confidence) of a contaminating component from the star impacting the exoplanet spectrum. While intriguing, our results are inconclusive and additional data is needed to verify any atmospheric signal. Fortunately, additional data has been collected from both HST and JWST. Should this result be confirmed with additional data, L 98-59 c would be the first planet smaller than two Earth-radii with a detected atmosphere. |
| title | The transmission spectrum of the potentially rocky planet L 98-59 c |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2301.10866 |