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dc.contributor.authorKral, Quentin
dc.contributor.authorWyatt, Mark
dc.contributor.authorTriaud, Amaury
dc.contributor.authorMarino, Sebastian
dc.contributor.authorThebault, Philippe
dc.contributor.authorShorttle, Oliver
dc.date.accessioned2018-09-17T11:04:02Z
dc.date.available2018-09-17T11:04:02Z
dc.date.issued2018-09
dc.identifier.issn1365-2966
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/280285
dc.description.abstractThe TRAPPIST-1 system is unique in that it has a chain of seven terrestrial Earth-like planets located close to or in its habitable zone. In this paper, we study the effect of potential cometary impacts on the TRAPPIST-1 planets and how they would affect the primordial atmospheres of these planets. We consider both atmospheric mass loss and volatile delivery with a view to assessing whether any sort of life has a chance to develop. We ran N-body simulations to investigate the orbital evolution of potential impacting comets, to determine which planets are more likely to be impacted and the distributions of impact velocities. We consider three scenarios that could potentially throw comets into the inner region (i.e. within 0.1 au where the seven planets are located) from an (as yet undetected) outer belt similar to the Kuiper belt or an Oort cloud: planet scattering, the Kozai–Lidov mechanism, and Galactic tides. For the different scenarios, we quantify, for each planet, how much atmospheric mass is lost and what mass of volatiles can be delivered over the age of the system depending on the mass scattered out of the outer belt. We find that the resulting high-velocity impacts can easily destroy the primordial atmospheres of all seven planets, even if the mass scattered from the outer belt is as low as that of the Kuiper belt. However, we find that the atmospheres of the outermost planets f, g, and h can also easily be replenished with cometary volatiles (e.g. ~ an Earth ocean mass of water could be delivered). These scenarios would thus imply that the atmospheres of these outermost planets could be more massive than those of the innermost planets, and have volatiles-enriched composition.
dc.publisherOxford University Press
dc.subjectcomets: general
dc.subjectmeteorites, meteors, meteoroids
dc.subjectplanets and satellites: atmospheres
dc.subjectcircumstellar matter
dc.titleCometary impactors on the TRAPPIST-1 planets can destroy all planetary atmospheres and rebuild secondary atmospheres on planets f, g, and h
dc.typeArticle
prism.endingPage2672
prism.issueIdentifier2
prism.publicationDate2018
prism.publicationNameMonthly Notices of the Royal Astronomical Society
prism.startingPage2649
prism.volume479
dc.identifier.doi10.17863/CAM.27653
dcterms.dateAccepted2018-06-19
rioxxterms.versionofrecord10.1093/mnras/sty1677
rioxxterms.versionVoR
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.licenseref.startdate2018-09
dc.contributor.orcidWyatt, Mark [0000-0001-9064-5598]
dc.contributor.orcidTriaud, Amaury [0000-0002-5510-8751]
dc.contributor.orcidMarino, Sebastian [0000-0002-5352-2924]
dc.contributor.orcidShorttle, Oliver [0000-0002-8713-1446]
dc.identifier.eissn1365-2966
rioxxterms.typeJournal Article/Review
pubs.funder-project-idScience and Technology Facilities Council (ST/N000927/1)
cam.issuedOnline2018-06-26


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