Characterization of exoplanetary atmospheres through a model-unbiased spectral survey methodology

Context. Collecting a large variety of exoplanetary atmosphere measurements is crucial to improve our understanding exoplanets. In this context, it likely that the field would benefit from broad species surveys, particularly using transit spectroscopy, which most successful technique characterization so far. Aims: Our goal develop model-unbiased spectroscopy analyze every qualified atomic spectral line in data, and search for relative absorption, is, decrease flux when planet transiting. Methods: We analyzed archive data HDS at Subaru, HIRES Keck, UVES VLT, HARPS LaSilla test survey methodology. It first filtered individual lines by noise levels. also corrected offsets telluric contamination. methodology performed an analysis along time wavelength. The latter employed bootstrap corroboration. Results: highlight possible detections Mn I V II HD 209459b taken Subaru ($5.9\sigma$ 5916.4 $\angstrom$, $5.1\sigma$ 6021.8 $\angstrom$). previous detection Ca same classified as inconclusive algorithm, but we support Sc ($3.5\sigma$ 6604.6 I, II, Ti 189733 VLT ($4.4\sigma$ $6572.8 \angstrom$, $6.8\sigma$ $6604.6 $3.5\sigma$ $5910.1 \angstrom$), addition Al WASP-74b ($5.6 \sigma$ $6696.0 \angstrom$).