A dark, bare rock for TOI-1685 b from a JWST NIRSpec G395H phase curve
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866909415672643584 |
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| author | Luque, Rafael Coy, Brandon Park Xue, Qiao Feinstein, Adina D. Ahrer, Eva-Maria Changeat, Quentin Zhang, Michael Moran, Sarah E. Bean, Jacob L. Kite, Edwin Mansfield, Megan Weiner Pallé, Enric |
| author_facet | Luque, Rafael Coy, Brandon Park Xue, Qiao Feinstein, Adina D. Ahrer, Eva-Maria Changeat, Quentin Zhang, Michael Moran, Sarah E. Bean, Jacob L. Kite, Edwin Mansfield, Megan Weiner Pallé, Enric |
| contents | We report JWST NIRSpec/G395H observations of TOI-1685 b, a hot rocky super-Earth orbiting an M2.5V star, during a full orbit. We obtain transmission and emission spectra of the planet and characterize the properties of the phase curve, including its amplitude and offset. The transmission spectrum rules out clear H$_2$-dominated atmospheres, while secondary atmospheres (made of water, methane, or carbon dioxide) cannot be statistically distinguished from a flat line. The emission spectrum is featureless and consistent with a blackbody-like brightness temperature, helping rule out thick atmospheres with high mean molecular weight. Collecting all evidence, the properties of TOI-1685 b are consistent with a blackbody with no heat redistribution and a low albedo, with a dayside brightness temperature 0.98$\pm$0.07 times that of a perfect blackbody in the NIRSpec NRS2 wavelength range (3.823-5.172 um). Our results add to the growing number of seemingly airless M-star rocky planets, thus constraining the location of the "Cosmic Shoreline".
Three independent data reductions have been carried out, all showing a high-amplitude correlated noise component in the white and spectroscopic light curves. The correlated noise properties are different between the NRS1 and NRS2 detectors - importantly the timescales of the strongest components (4.5 hours and 2.5 hours, respectively) - suggesting the noise is from instrumental rather than astrophysical origins. We encourage the community to look into the systematics of NIRSpec for long time-series observations. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2412_03411 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A dark, bare rock for TOI-1685 b from a JWST NIRSpec G395H phase curve Luque, Rafael Coy, Brandon Park Xue, Qiao Feinstein, Adina D. Ahrer, Eva-Maria Changeat, Quentin Zhang, Michael Moran, Sarah E. Bean, Jacob L. Kite, Edwin Mansfield, Megan Weiner Pallé, Enric Earth and Planetary Astrophysics We report JWST NIRSpec/G395H observations of TOI-1685 b, a hot rocky super-Earth orbiting an M2.5V star, during a full orbit. We obtain transmission and emission spectra of the planet and characterize the properties of the phase curve, including its amplitude and offset. The transmission spectrum rules out clear H$_2$-dominated atmospheres, while secondary atmospheres (made of water, methane, or carbon dioxide) cannot be statistically distinguished from a flat line. The emission spectrum is featureless and consistent with a blackbody-like brightness temperature, helping rule out thick atmospheres with high mean molecular weight. Collecting all evidence, the properties of TOI-1685 b are consistent with a blackbody with no heat redistribution and a low albedo, with a dayside brightness temperature 0.98$\pm$0.07 times that of a perfect blackbody in the NIRSpec NRS2 wavelength range (3.823-5.172 um). Our results add to the growing number of seemingly airless M-star rocky planets, thus constraining the location of the "Cosmic Shoreline". Three independent data reductions have been carried out, all showing a high-amplitude correlated noise component in the white and spectroscopic light curves. The correlated noise properties are different between the NRS1 and NRS2 detectors - importantly the timescales of the strongest components (4.5 hours and 2.5 hours, respectively) - suggesting the noise is from instrumental rather than astrophysical origins. We encourage the community to look into the systematics of NIRSpec for long time-series observations. |
| title | A dark, bare rock for TOI-1685 b from a JWST NIRSpec G395H phase curve |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2412.03411 |