J/ApJ/898/L38ivo://CDS.VizieR/J/ApJ/898/L38doi:10.26093/cds/vizier.18989038CDSRen B.Dong R.van Holstein R.G.Ruffio J.-B.Calvin B.A.Girard J.H.,Benisty M.Boccaletti A.Esposito T.M.Choquet E.Mawet D.Pueyo L.,Stolker T.Chiang E.de Boer J.Debes J.H.Garufi A.Grady C.A.,Hines D.C.Maire A.-L.Menard F.Millar-Blanchaer M.A.Perrin M.D.,Poteet C.A.Schneider G.2022-03-21T09:24:26Z2021-12-30T09:10:32ZCDS support team

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

cds-question@unistra.fryoung-stellar-objectsinfrared-sourcesMore than a dozen young stars host spiral arms in their surrounding protoplanetary disks. The excitation mechanisms of such arms are under debate. The two leading hypotheses-companion-disk interaction and gravitational instability (GI)-predict distinct motion for spirals. By imaging the MWC 758 spiral arm system at two epochs spanning ~5yr using the SPHERE instrument on the Very Large Telescope (VLT), we test the two hypotheses for the first time. We find that the pattern speeds of the spirals are not consistent with the GI origin. Our measurements further evince the existence of a faint "missing planet" driving the disk arms. The average spiral pattern speed is 0.22+/-0.03/yr, pointing to a driver at 172_-14_^+18^ au around a 1.9M_{sun}_ central star if it is on a circular orbit. In addition, we witness time-varying shadowing effects on a global scale that are likely originating from an inner disk.2020ApJ...898L..38Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/898/L38CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)J/AJ/126/2971 : UBVRI photometry of 131 Herbig Ae/Be (Vieira+, 2003)J/ApJ/745/174 : Evolutionary models of gas-giant planets (Spiegel+, 2012)J/A+A/578/L6 : Polarized images of MWC758 (Benisty+, 2015)J/A+A/611/A74 : Angular differential imaging of MCW 758 (Reggiani+, 2018)J/A+A/620/A128 : Gaia DR2 study of Herbig Ae/Be stars (Vioque+, 2018)J/AJ/157/33 : RVel exploration of {epsilon} Eridani (Mawet+, 2019)J/A+A/633/A82 : Disks around T Tauri stars with SPHERE. II. (Garufi+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/898/L38https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/898/L38http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/898/L38https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/898/L38https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/898/L38http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/898/L38GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/898/L38/files (*VLT/SPHERE observations of MWC 758 spiral arms from 2015 and 2019; FITS images from data behind Figure 1)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/898/L38/files?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/898/L38/files?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/898/L38/files?GETtext/xml+votable180.050000true82.614702825.33252280.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/ApJ/898/L386/24279https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/898/L38?format=asciiInfrareddefaultJ/ApJ/898/L38/files*VLT/SPHERE observations of MWC 758 spiral arms from 2015 and 2019; FITS images from data behind Figure 1recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameTarget namemeta.id;meta.maincharfitsDownload the FITS filemeta.ref.urlcharFileName of the FITS file in subdirectory "img"meta.id;meta.fitscharDateObservation datetime.epoch;obsnullablePIDESO program IDmeta.id;obscharADatDisplay the image in Saada/VizieR associated data webpagemeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main