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- W4384111554 abstract "Transmission spectroscopy is currently the most powerful technique to study a wide range of planetary atmospheres, leveraging the filtering of a stars light by a planets atmosphere rather than its own emission. However, both a planet and its star contribute to the information encoded in a transmission spectrum and a particular challenge relate to disentangling their contributions. As measurements improve, the lack of fidelity of stellar spectra models present a bottleneck for accurate disentanglement. Considering JWST and future high-precision spectroscopy missions, we investigate the ability to derive empirical constraints on the emission spectra of stellar surface heterogeneities (i.e., spots and faculae) using the same facility as used to acquire the transmission spectra intended to characterize a given atmosphere. Using TRAPPIST-1 as a test case, we demonstrate that it is possible to constrain the photospheric spectrum to 0.2% and the spectra of stellar heterogeneities to within 1-5%, which will be valuable benchmarks to inform the new generation of theoretical stellar models. Long baseline of observations (90% of the stellar rotation period) are necessary to ensure the photon-limited (i.e., instrument-limited) exploration of exoplanetary atmospheres via transmission spectroscopy." @default.
- W4384111554 created "2023-07-13" @default.
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- W4384111554 date "2023-07-10" @default.
- W4384111554 modified "2023-09-24" @default.
- W4384111554 title "Empirically Constraining the Spectra of a Stars Heterogeneities From Its Rotation Lightcurve" @default.
- W4384111554 doi "https://doi.org/10.48550/arxiv.2307.04785" @default.
- W4384111554 hasPublicationYear "2023" @default.
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