Exoplanetary atmospheric sodium revealed by the orbital motion. Narrow-band transmission spectroscopy of HD 189733b with UVES · HackerPapers discussionshttps://hackerpaper.kaipfister.de/p/1610.01610/Collected HN comments and submissions linking this paper.enMon, 02 Nov 2026 11:16:22 GMTExoplanetary atmospheric sodium revealed by the orbital motion. Narrow-band transmission spectroscopy of HD 189733b with UVES — mentioned by mturmonhttps://news.ycombinator.com/item?id=17611603urn:hackerpapers:mention:1610.01610:17611603Wed, 25 Jul 2018 18:29:46 GMT<p>Original 2017 paper in A&amp;A: https://arxiv.org/pdf/1610.01610.pdf The element they used is sodium: &quot;During primary transits, the spectral signatures of exoplanet atmospheres can be measured using transmission spectroscopy. We can obtain information on the upper atmosphere of these planets by investigating the exoplanets’ excess sodium absorption in the optical region.&quot;</p><p><a href="https://hackerpaper.kaipfister.de/p/1610.01610/">Paper and discussion history</a>. A mention is not an endorsement.</p>astro-ph.EP