Show simple item record

dc.contributor.authorRafikov, Roman
dc.date.accessioned2018-12-04T00:30:42Z
dc.date.available2018-12-04T00:30:42Z
dc.date.issued2018-11-01
dc.identifier.issn2041-8205
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/286249
dc.description.abstractObservations of the first interstellar minor object 1I/2017 'Oumuamua did not reveal direct signs of outgassing that would have been natural if it had volatile-rich composition. However, a recent measurement by Micheli et al (2018) of a substantial non-gravitational acceleration affecting the orbit of this object has been interpreted as resulting from its cometary activity, which must be rather vigorous. Here we critically re-assess this interpretation by exploring the implications of measured non-gravitational acceleration for the 'Oumuamua's rotational state. We show that outgassing torques should drive rapid evolution of 'Oumuamua's spin (on a timescale of a few days), assuming torque asymmetry typical for the Solar System comets. However, given the highly elongated shape of the object, its torque asymmetry is likely higher, implying even faster evolution. This would have resulted in rapid rotational fission of 'Oumuamua during its journey through the Solar System and is clearly incompatible with the relative stability of its rotational state inferred from photometric variability. Based on these arguments, as well as the lack of direct signs of outgassing, we conclude that the classification of 'Oumuamua as a comet (invoked to explain its claimed anomalous acceleration) is questionable.
dc.publisherAmerican Astronomical Society
dc.titleSpin Evolution and Cometary Interpretation of the Interstellar Minor Object 1I/2017 'Oumuamua
dc.typeArticle
prism.issueIdentifier1
prism.publicationDate2018
prism.publicationNameAstrophysical Journal Letters
prism.volume867
dc.identifier.doi10.17863/CAM.33561
dcterms.dateAccepted2018-09-30
rioxxterms.versionofrecord10.3847/2041-8213/aae977
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.licenseref.startdate2018-11-01
dc.contributor.orcidRafikov, Roman [0000-0002-0012-1609]
dc.identifier.eissn2041-8213
dc.publisher.urlhttp://dx.doi.org/10.3847/2041-8213/aae977
rioxxterms.typeJournal Article/Review
pubs.funder-project-idScience and Technology Facilities Council (ST/P000673/1)
pubs.funder-project-idScience and Technology Facilities Council (ST/L000636/1)
cam.issuedOnline2018-10-31
rioxxterms.freetoread.startdate2019-11-01


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record