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Benchmark Tests of Transmission Spectroscopy Using Transiting White Dwarfs by Jiang, Chengzi; Chen, Guo; Pallé, Enric; Parviainen, Hannu; Murgas, Felipe; Ma, Yuehua is a scholarly article available to read on EtoBox.

What is Benchmark Tests of Transmission Spectroscopy Using Transiting White Dwarfs about?

Ground-based transit observations are affected by both telluric absorption and instrumental systematics. To account for these effects, a better understanding of the impact of different data analyses is needed to improve the accuracy of the retrieved transmission spectra. We propose validating ground-based low-resolution transmission spectroscopy using transiting white dwarfs. The advantage here is that we know beforehand what the final transmission spectrum should be: a featureless flat spectrum. We analyzed two transiting white dwarfs analogous to hot Jupiters. We used various noise models to account for the systematic noise in their spectroscopic light curves following common procedures of transmission spectroscopy analyses. We compared the derived transmission spectra with the broadband transit depth to determine whether there are any artificial offsets or spectral features arising from light-curve fitting. The results show a strong model dependence, and the transmission spectra exhibit considerable discrepancies when they are computed with different noise models, different reference stars, and different common-mode removal methods. Nonetheless, we can still derive relatively ac

Author

Jiang, Chengzi; Chen, Guo; Pallé, Enric; Parviainen, Hannu; Murgas, Felipe; Ma, Yuehua

Published

2022

Language

EN