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| Name | Did JWST find a MARKER OF LIFE in an exoplanet atmosphere? |
| Video Uploader | Video From Dr. Becky |
| Upload Date | This Video Uploaded At 21-09-2023 19:00:11 |
| Video Discription | There’s been a big claim of a marker of life, known as a biosignature, found using JWST in the atmosphere of an exoplanet known as K2-18b. The data also confirmed this planet was a “Hycean” world, a planet with a liquid water ocean surrounded by a hydrogen dominated atmosphere. The biosignature that’s claimed to have been found is dimethyl sulphide, a molecule that on Earth is mostly produced by phytoplankton in the ocean. But how strong actually is the evidence for this claimed detection of dimethyl sulphide? Madhusudhan et al (2023; JWST observations of K2-18b) - https://arxiv.org/pdf/2309.05566.pdf Bell et al. (2023; JWST methane detection in the atmosphere of WASP-80b) - https://arxiv.org/pdf/2309.04042.pdf Benneke et al. (2019; HST observations of K2-18b and detection of water) - https://arxiv.org/pdf/1909.04642.pdf Hu et al. (2021; prediction of the molecules present in a hycean world atmosphere) - https://arxiv.org/pdf/2108.04745.pdf Greaves et al. (2021; phosphine detected in Venus’ atmosphere) - https://arxiv.org/pdf/2009.06593.pdf Constantinou et al. (2023; the different JWST reduction pipelines for exoplanet data) - https://arxiv.org/pdf/2301.02564.pdf Seager et al. (2013; biosignatures in exoplanet atmospheres) - https://arxiv.org/pdf/1309.6016.pdf JWST proposal 2722 - https://www.stsci.edu/jwst/phase2-public/2722.pdf JWST proposal 2372 - https://www.stsci.edu/jwst/phase2-public/2372.pdf Dr Jake Taylor on Twitter: https://twitter.com/astrojake Dr Jake Taylor on TikTok: https://www.tiktok.com/@astrojaket Dr Ryan MacDonald on Twitter: https://twitter.com/MartianColonist Prof Jayne Birkby on Twitter: https://twitter.com/jaynebirkby 00:00 Introduction 01:24 What do we already know about K2-18b? 04:01 How we use JWST to study exoplanet atmospheres 06:00 What has JWST found in the atmosphere of K2-18b 12:17 The caveats to these results (especially the DMS claim) 14:08 What’s next? How can we confirm or deny this claim of DMS? 15:52 Bloopers Correction: 02:38 K2-18b is LESS dense than Earth, not more dense. Verbal typo. Video filmed on a Sony ⍺7 IV --- 📚 My new book, "A Brief History of Black Holes", out NOW in hardback, e-book and audiobook (which I narrated myself!): http://lnk.to/DrBecky --- 📚 "The Year In Space" celebrating all things space in 2022 from me and the rest of the Supermassive Podcast team: https://geni.us/jNcrw --- 👕 My new merch, including JWST designs, are available here (with worldwide shipping!): https://dr-becky.teemill.com/ --- 🎧 Royal Astronomical Society Podcast that I co-host: podfollow.com/supermassive --- 🔔 Don't forget to subscribe and click the little bell icon to be notified when I post a new video! --- 👩🏽💻 I'm Dr. Becky Smethurst, an astrophysicist at the University of Oxford (Christ Church). I love making videos about science with an unnatural level of enthusiasm. I like to focus on how we know things, not just what we know. And especially, the things we still don't know. If you've ever wondered about something in space and couldn't find an answer online - you can ask me! My day job is to do research into how supermassive black holes can affect the galaxies that they live in. In particular, I look at whether the energy output from the disk of material orbiting around a growing supermassive black hole can stop a galaxy from forming stars. http://drbecky.uk.com https://rebeccasmethurst.co.uk |
| Category | Science & Technology |
| Tags | dr becky | astrophysics | physics | space | universe | scientist | solar system | astronomer | telescopes | james webb space telescope | aliens | NASA | ESA | becky smethurst | infrared | MIRI | NIRCam | unfoldtheuniverse | cosmos | redshift | technology | exoplanets | JWST | exo-earth | earth-like planets | alien life | search for life | atmospheres | water | carbon dioxide | photochemistry | spectroscopy | absorption | biosignature | methane | phosphine | chemistry | hubble | NIRSPEC | NIRISS | exoplanet | carl sagan | dimethyl sulfide | DMS | K2-18b | life |
