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composition of proto-planetary discs regarding ingredients for starting life on planets

composition of proto-planetary discs regarding ingredients for starting life on planets. [GALLO/GETTY]. Jane Greaves, Cardiff University. in the SPICA era. low-mass planets of moderate temperature common shift to: what are conditions like on these planets?. ARIEL Space Mission.

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composition of proto-planetary discs regarding ingredients for starting life on planets

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  1. composition of proto-planetary discs regarding ingredients for starting life on planets [GALLO/GETTY] Jane Greaves, Cardiff University

  2. in the SPICA era • low-mass planets of moderate temperature common • shift to: what are conditions like on these planets?

  3. ARIEL Space Mission • detecting biosignature gases in an atmosphere is incredibly hard...

  4. ingredients • what gases, ices and minerals are available in discs for planet formation, and where, and for how long? Planetary Systems and Star Formation with JWST G. H. Rieke

  5. close-ups • already see planets and discs interacting • ~1 AU zone is much harder image: Andrews/Dagnello

  6. L. Garvie/CMS • radio interferometry : planets overcoming barriers to formation images: NRAO

  7. PEBBLeS • Planet-Earth Building-Blocks Legacy eMERLIN Survey • tech exists to do this on 1 AU scale: proto-Earths? images: e-MERLIN; E. DRabek-Maunder

  8. next: what is going into planets? • first attempts at astrogeology (Unterborn et al. 2017, e.g.) explore whether planet compositions would allow plate tectonics ( oceans, continents, carbon drawdown....) • what can SPICA and precursors tell us about minerals going into planets?

  9. pushing boundaries • ‘single point failure’ approach: any missing vital ingredient? • e.g. radio-isotopes that keep planet cores warm • e.g. C,H,N,O,P,S elements used by organisms  surveying the phosphorus cycle www.geologyin.com/2016/08/ancient-rocks-suggest-meteorites.html

  10. P for planets • enigmatic at its SNe origins

  11. P in discs • phosphorus delivery to planets and role in origins of life enigmatic too • leading candidate to kick-start P-chemistry on surface is schreibersite • broad features are a challenge for JWST/SPICA combination C. Lisse

  12. Lefloch et al. (2016) • a census of gases, ices and minerals is needed to say how P might be delivered to a range of planets in discs  SPICA, JWST, ALMA • protostar observations suggest P is more abundant where shocks occur • first detection of P-bearing gas in a proto-planetary disc made with ALMA

  13. census for an edge-on disc • PN 2-1 detected in Oph IRS 46

  14. roles for SPICA • SPICA can study the composition and abundance of a wide range of ingredients wanted on planets • completes the links from star-cluster birth environment to accreting planets • hence, whether ingredients involved with origins of life on Earth are present

  15. so we can target maybe a few rare “Earth 2.0’s”

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