J/A+A/610/L12ivo://CDS.VizieR/J/A+A/610/L12doi:10.26093/cds/vizier.36109012CDSDeeg H.J.Alonso R.Nespral D.Boyajian T.2018-03-12T09:20:04Z2018-02-23T07:50:05ZCDS support team

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

cds-question@unistra.frpeculiar-variable-starsspectrophotometryspectroscopyWe report ground-based spectrophotometry of KIC 8462852, during its first dimming events since the end of the Kepler mission. The dimmings show a clear colour-signature, and are deeper in visual blue wavelengths than in red ones. The flux loss' wavelength dependency can be described with an absorption Angstroem coefficient of 2.19+/-0.45, which is compatible with absorption by optically thin dust with particle sizes on the order of 0.0015 to 0.15um. These particles would be smaller than is required to be resistant against blow-out by radiation pressure when close to the star. During occultation events, these particles must be replenished on time-scales of days. If dust is indeed the source of KIC 8462852's dimming events, deeper dimming events should show more neutral colours, as is expected from optically thick absorbers.2018A&A...610L..12Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/610/L12CatalogResearchIsServedByTAP VizieR generic servicerelated-toV/133 : Kepler Input Catalog (Kepler Mission Team, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/610/L12https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/610/L12http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/610/L12https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/610/L12https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/610/L12http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/610/L12GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/610/L12/time_p08Pointing 08 times of mid-exposure of each spectrumrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime (BJD-2400000)dtime.epochdoublespTargetName of the target spectrum name in subdirectory sp_targetmeta.id;meta.filecharspCompName of the comparison spectrum name in subdirectory sp_comparmeta.id;meta.filecharspShow the spectrameta.ref.urlcharJ/A+A/610/L12/time_p09Pointing 09 times of mid-exposure of each spectrumrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime (BJD-2400000)dtime.epochdoublespTargetName of the target spectrum name in subdirectory sp_targetmeta.id;meta.filecharspCompName of the comparison spectrum name in subdirectory sp_comparmeta.id;meta.filecharspShow the spectrameta.ref.urlcharJ/A+A/610/L12/time_p10Pointing 10 times of mid-exposure of each spectrumrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime (BJD-2400000)dtime.epochdoublespTargetName of the target spectrum name in subdirectory sp_targetmeta.id;meta.filecharspCompName of the comparison spectrum name in subdirectory sp_comparmeta.id;meta.filecharspShow the spectrameta.ref.urlcharJ/A+A/610/L12/time_p11Pointing 11 times of mid-exposure of each spectrumrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime (BJD-2400000)dtime.epochdoublespTargetName of the target spectrum name in subdirectory sp_targetmeta.id;meta.filecharspCompName of the comparison spectrum name in subdirectory sp_comparmeta.id;meta.filecharspShow the spectrameta.ref.urlcharJ/A+A/610/L12/time_p12Pointing 12 times of mid-exposure of each spectrumrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime (BJD-2400000)dtime.epochdoublespTargetName of the target spectrum name in subdirectory sp_targetmeta.id;meta.filecharspCompName of the comparison spectrum name in subdirectory sp_comparmeta.id;meta.filecharspShow the spectrameta.ref.urlcharJ/A+A/610/L12/time_p13Pointing 13 times of mid-exposure of each spectrumrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime (BJD-2400000)dtime.epochdoublespTargetName of the target spectrum name in subdirectory sp_targetmeta.id;meta.filecharspCompName of the comparison spectrum name in subdirectory sp_comparmeta.id;meta.filecharspShow the spectrameta.ref.urlcharJ/A+A/610/L12/table1Observed fluxes at each pointing in five wavelengths bands, indicated by their central wavelengths in nmrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNr[1/16] Pointing sequential numbermeta.recordintn_Nr[ab] Note (1)meta.notecharBJDObservation central time of each pointing (BJD-2400000)dtime.epochdoubleF556Observed normalized flux in 556um bandphot.flux;em.mm.400-750GHz;arith.ratiofloate_F556rms uncertainty on F556stat.errorfloatF618Observed normalized flux in 618um bandphot.flux;em.mm.400-750GHz;arith.ratiofloate_F618rms uncertainty on F618stat.errorfloatF709Observed normalized flux in 709um bandphot.flux;em.mm.400-750GHz;arith.ratiofloate_F709rms uncertainty on F709stat.errorfloatF792Observed normalized flux in 792um bandphot.flux;em.mm.200-400GHz;arith.ratiofloate_F792rms uncertainty on F792stat.errorfloatF868Observed normalized flux in 868um bandphot.flux;em.mm.200-400GHz;arith.ratiofloate_F868rms uncertainty on F868stat.errorfloatFileNameName of the table with times of mid-exposure of each spectrum for this pointingphot.flux;arith.ratiocharJ/A+A/610/L12/time_p02Pointing 02 times of mid-exposure of each spectrumrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime (BJD-2400000)dtime.epochdoublespTargetName of the target spectrum name in subdirectory sp_targetmeta.id;meta.filecharspCompName of the comparison spectrum name in subdirectory sp_comparmeta.id;meta.filecharspShow the spectrameta.ref.urlcharJ/A+A/610/L12/time_p04Pointing 04 times of mid-exposure of each spectrumrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime (BJD-2400000)dtime.epochdoublespTargetName of the target spectrum name in subdirectory sp_targetmeta.id;meta.filecharspCompName of the comparison spectrum name in subdirectory sp_comparmeta.id;meta.filecharspShow the spectrameta.ref.urlcharJ/A+A/610/L12/time_p14Pointing 14 times of mid-exposure of each spectrumrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime (BJD-2400000)dtime.epochdoublespTargetName of the target spectrum name in subdirectory sp_targetmeta.id;meta.filecharspCompName of the comparison spectrum name in subdirectory sp_comparmeta.id;meta.filecharspShow the spectrameta.ref.urlcharJ/A+A/610/L12/time_p01Pointing 01 times of mid-exposure of each spectrumrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime (BJD-2400000)dtime.epochdoublespTargetName of the target spectrum name in subdirectory sp_targetmeta.id;meta.filecharspCompName of the comparison spectrum name in subdirectory sp_comparmeta.id;meta.filecharspShow the spectrameta.ref.urlcharJ/A+A/610/L12/time_p15Pointing 15 times of mid-exposure of each spectrumrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime (BJD-2400000)dtime.epochdoublespTargetName of the target spectrum name in subdirectory sp_targetmeta.id;meta.filecharspCompName of the comparison spectrum name in subdirectory sp_comparmeta.id;meta.filecharspShow the spectrameta.ref.urlcharJ/A+A/610/L12/time_p16Pointing 16 times of mid-exposure of each spectrumspShow the spectrameta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime (BJD-2400000)dtime.epochdoublespTargetName of the target spectrum name in subdirectory sp_targetmeta.id;meta.filecharspCompName of the comparison spectrum name in subdirectory sp_comparmeta.id;meta.filecharJ/A+A/610/L12/time_p03Pointing 03 times of mid-exposure of each spectrumspShow the spectrameta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime (BJD-2400000)dtime.epochdoublespTargetName of the target spectrum name in subdirectory sp_targetmeta.id;meta.filecharspCompName of the comparison spectrum name in subdirectory sp_comparmeta.id;meta.filecharJ/A+A/610/L12/time_p05Pointing 05 times of mid-exposure of each spectrumrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime (BJD-2400000)dtime.epochdoublespTargetName of the target spectrum name in subdirectory sp_targetmeta.id;meta.filecharspCompName of the comparison spectrum name in subdirectory sp_comparmeta.id;meta.filecharspShow the spectrameta.ref.urlcharJ/A+A/610/L12/time_p06Pointing 06 times of mid-exposure of each spectrumrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime (BJD-2400000)dtime.epochdoublespTargetName of the target spectrum name in subdirectory sp_targetmeta.id;meta.filecharspCompName of the comparison spectrum name in subdirectory sp_comparmeta.id;meta.filecharspShow the spectrameta.ref.urlcharJ/A+A/610/L12/time_p07Pointing 07 times of mid-exposure of each spectrumrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDTime (BJD-2400000)dtime.epochdoublespTargetName of the target spectrum name in subdirectory sp_targetmeta.id;meta.filecharspCompName of the comparison spectrum name in subdirectory sp_comparmeta.id;meta.filecharspShow the spectrameta.ref.urlchar