J/other/NatAs/7.ivo://CDS.VizieR/J/other/NatAs/7.39doi:10.26093/cds/vizier/dt/hkdjCDSBonsor A.Lichtenberg T.Drazkowska J.Buchan A.M.2026-03-04T20:03:31Z2023-10-03T15:34:58ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frwhite-dwarf-starschemical-abundancesvisible-astronomyThe timing of formation of the first planetesimals determines the mode of planetary accretion and their geophysical and compositional evolution. Astronomical observations of circumstellar disks and Solar System geochronology provide evidence for planetesimal formation during molecular cloud collapse, much earlier than previously estimated. Here we present distinct observational evidence from white dwarf planetary systems for planetesimal formation occurring during the first few hundred thousand years after cloud collapse in exoplanetary systems. A substantial fraction of white dwarfs have accreted planetary material rich in iron core or mantle material. For the exo-asteroids accreted by white dwarfs to form iron cores, substantial heating is required. By simulating planetesimal evolution and collisional evolution, we show that the most likely heat source is short-lived radioactive nuclides such as 26Al (which has a half-life of ~0.7yr). Core-rich materials in the atmospheres of white dwarfs, therefore, provide independent evidence for rapid planetesimal formation, concurrent with star formation.2023NatAs...7...39Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/other/NatAs/7.39CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/other/NatAs/7.39https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/other/NatAs/7.39http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/other/NatAs/7.39https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/other/NatAs/7.39https://vizier.iucaa.in/viz-bin/votable?-source=J/other/NatAs/7.39http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/other/NatAs/7.39GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/other/NatAs/7.39/tabled1 (Properties of the white dwarfs included in Two)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/other/NatAs/7.39/tabled1?https://vizier.iucaa.in/viz-bin/conesearch/J/other/NatAs/7.39/tabled1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/other/NatAs/7.39/tabled1?GETtext/xml+votable180.050000true335.889583368.62446940.0055555555555555566/1449 3887 4156 4770 4887 4898 5139 5334 5780 6255 6568 6591 7312 7457 8480 8501 9495 9606 9869 10457 10510 11147 11149 11166 11335 11429 14991 15816 16243 17386 18902 19382 19455 19806 22821 25460 25850 25931 26250 26975 27048 27491 27543 27631 27719 27742 30465 34686 36861 44732 45561 45921 48942https://cdsarc.cds.unistra.fr/viz-bin/moc/J/other/NatAs/7.39?format=asciiOpticaldefaultJ/other/NatAs/7.39/tabled1Properties of the white dwarfs included in TwoSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameNamemeta.id;meta.maincharGaiaDR3Gaia DR3 source_idmeta.idRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainTeffEffective temperatureKphys.temperature.effectiveintTypeType (H or He)src.classcharNelNumber of elements in the photosphere and included in the models used heremeta.numberintJ/other/NatAs/7.39/tabled2Atmospheric abundances of the white dwarfs included in TworecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameNamemeta.id;meta.maincharRefReferences, in refs.dat filemeta.ref;meta.filecharCaCa abundancephys.abundfloatn_Ca[i] Note on Ca (1)meta.notechare_CaCa abundance errorstat.errorfloatn_e_Ca[i] Note on e_Ca (1)meta.notecharFeFe abundancephys.abundfloate_FeFe abundance errorstat.error;phys.abund.FefloatMg? Mg abundancephys.abundfloatnullablen_Mg[i] Note on Mg (1)meta.notechare_Mg? Mg abundance errorstat.errorfloatnullablen_e_Mg[i] Note on e_Mg (1)meta.notecharl_NiLimit flag on Nimeta.code.errorcharNi? Ni abundancephys.abundfloatnullablee_Ni? Ni abundance errorstat.errorfloatnullablel_CrLimit flag on Crmeta.code.errorcharCr? Cr abundancephys.abundfloatnullablee_Cr? Cr abundance errorstat.errorfloatnullablel_SiLimit flag on Simeta.code.errorcharSi? Si abundancephys.abundfloatnullablee_Si? Si abundance errorstat.errorfloatnullablel_NaLimit flag on Nameta.code.errorcharNa? Na abundancephys.abundfloatnullablee_Na? Na abundance errorstat.errorfloatnullablel_TiLimit flag on Timeta.code.errorcharTi? Ti abundancephys.abundfloatnullablee_Ti? Ti abundance errorstat.errorfloatnullablel_AlLimit flag on Almeta.code.errorcharAl? Al abundancephys.abundfloatnullablee_Al? Al abundance errorstat.errorfloatnullablel_OLimit flag on Ometa.code.errorcharO? O abundancephys.abundfloatnullablee_O? O abundance errorstat.errorfloatnullableJ/other/NatAs/7.39/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference numbermeta.id;meta.mainintBibCodeBibCodemeta.bib.bibcodecharAutAuthors' namemeta.idcharComCommentsmeta.notechar