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dc.contributor.authorLisse, C. M.
dc.contributor.authorMeng, H. Y. A.
dc.contributor.authorSitko, M. L.
dc.contributor.authorMorlok, A.
dc.contributor.authorJohnson, B. C.
dc.contributor.authorJackson, A. P.
dc.contributor.authorVervack, R. J. Jr.
dc.contributor.authorChen, C. H.
dc.contributor.authorWolk, S. J.
dc.contributor.authorLucas, M. D.
dc.contributor.authorMarengo, M.
dc.contributor.authorBritt, D. T.
dc.date.accessioned2020-11-07T02:22:27Z
dc.date.available2020-11-07T02:22:27Z
dc.date.issued2020-05-12
dc.identifier.citationLisse, C. M., Meng, H. Y. A., Sitko, M. L., Morlok, A., Johnson, B. C., Jackson, A. P., ... & Britt, D. T. (2020). HD 145263: Spectral Observations of Silica Debris Disk Formation via Extreme Space Weathering?. The Astrophysical Journal, 894(2), 116.en_US
dc.identifier.issn0004-637X
dc.identifier.doi10.3847/1538-4357/ab7b80
dc.identifier.urihttp://hdl.handle.net/10150/648149
dc.description.abstractWe report here time-domain infrared spectroscopy and optical photometry of the HD 145263 silica-rich circumstellar-disk system taken from 2003 through 2014. We find an F4V host star surrounded by a stable, massive 10(22)-10(23) kg (M-Moon to M-Mars) dust disk. No disk gas was detected, and the primary star was seen rotating with a rapid similar to 1.75 day period. After resolving a problem with previously reported observations, we find the silica, Mg-olivine, and Fe-pyroxene mineralogy of the dust disk to be stable throughout and very unusual compared to the ferromagnesian silicates typically found in primordial and debris disks. By comparison with mid-infrared spectral features of primitive solar system dust, we explore the possibility that HD 145263's circumstellar dust mineralogy occurred with preferential destruction of Fe-bearing olivines, metal sulfides, and water ice in an initially comet-like mineral mix and their replacement by Fe-bearing pyroxenes, amorphous pyroxene, and silica. We reject models based on vaporizing optical stellar megaflares, aqueous alteration, or giant hypervelocity impacts as unable to produce the observed mineralogy. Scenarios involving unusually high Si abundances are at odds with the normal stellar absorption near-infrared feature strengths for Mg, Fe, and Si. Models involving intense space weathering of a thin surface patina via moderate (T < 1300 K) heating and energetic ion sputtering due to a stellar super-flare from the F4V primary are consistent with the observations. The space-weathered patina should be reddened, contain copious amounts of nanophase Fe, and should be transient on timescales of decades unless replenished.en_US
dc.description.sponsorshipNational Aeronautics and Space Administrationen_US
dc.language.isoenen_US
dc.publisherIOP PUBLISHING LTDen_US
dc.rights© 2020. The American Astronomical Society. All rights reserved.en_US
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectPlanetary system formationen_US
dc.subjectTime domain astronomyen_US
dc.subjectStellar astronomyen_US
dc.subjectSpectroscopyen_US
dc.subjectCircumstellar matteren_US
dc.subjectStellar classificationen_US
dc.titleHD 145263: Spectral Observations of Silica Debris Disk Formation via Extreme Space Weathering?en_US
dc.typeArticleen_US
dc.identifier.eissn1538-4357
dc.contributor.departmentUniv Arizona, Dept Astron, Steward Observen_US
dc.identifier.journalASTROPHYSICAL JOURNALen_US
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en_US
dc.eprint.versionFinal published versionen_US
dc.source.journaltitleThe Astrophysical Journal
dc.source.volume894
dc.source.issue2
dc.source.beginpage116
refterms.dateFOA2020-11-07T02:22:42Z


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