Can planet formation resolve the dust budget crisis in high-redshift galaxies?
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The process of planet formation offers a rich source of dust production via grain growth in protostellar discs, and via grinding of larger bodies in debris disc systems. Chemical evolution models, designed to follow the build up of metals and dust in galaxies, do not currently account for planet formation. We consider the possibility that the apparent underprediction of dust mass in high-redshift galaxies by chemical evolution models could be in part, due to these models neglecting this process, specifically due to their assumption that a large fraction of the dust mass is removed from the interstellar medium during star formation (so-called astration). By adding a planet formation phase into galaxy chemical evolution, we demonstrate that the dust budget crisis can be partially ameliorated by a factor of 1.3–1.5 only if (i) circumstellar discs prevent a large fraction of the dust mass entering the star during its birth, and (ii) that dust mass is preferentially liberated via jets, winds and outflows rather than accreted into planetary-mass bodies.
Forgan , D H , Rowlands , K , Gomez , H L , Gomez , E L , Schofield , S P , Dunne , L & Maddox , S 2017 , ' Can planet formation resolve the dust budget crisis in high-redshift galaxies? ' Monthly Notices of the Royal Astronomical Society , vol. 472 , no. 2 , pp. 2289-2296 . DOI: 10.1093/mnras/stx2162
Monthly Notices of the Royal Astronomical Society
© 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at: https://doi.org/10.1093/mnras/stx2162
DescriptionDHF gratefully acknowledges support from the ECOGAL project, grant agreement 291227, funded by the European Research Council under ERC-2011-ADG. K R acknowledges support from the European Research Council Starting Grant SEDmorph (P.I. V. Wild). HLG, LD and SM acknowledge support from the European Research Council (ERC) in the form of Consolidator Grant COSMICDUST (ERC-2014-CoG- 647939, PI HL Gomez). LD and SJM acknowledge support from European Research Council Advanced Investigator Grant COSMICISM, 321302.
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