J/ApJ/927/135ivo://CDS.VizieR/J/ApJ/927/135doi:10.26093/cds/vizier.19270135CDSSu K.Y.L.Kennedy G.M.Schlawin E.Jackson A.P.Rieke G.H.2024-11-06T20:23:42Z2024-02-05T09:24:34ZCDS support team

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

cds-question@unistra.frinfrared-photometryf-starsWe report on five years of 3-5{mu}m photometry measurements obtained by warm Spitzer to track the dust debris emission in the terrestrial zone of HD 166191 in combination with simultaneous optical data. We show that the debris production in this young (~10Myr) system increased significantly in early 2018 and reached a record high level (almost double by mid 2019) by the end of the Spitzer mission (early 2020), suggesting intense collisional activity in its terrestrial zone likely due to either initial assembling of terrestrial planets through giant impacts or dynamical shake-up from unseen planet-mass objects or recent planet migration. This intense activity is further highlighted by detecting a star-size dust clump, passing in front of the star, in the midst of its infrared brightening. We constrain the minimum size and mass of the clump using multiwavelength transit profiles and conclude that the dust clump is most likely created by a large impact involving objects of several hundred kilometers in size with an apparent period of 142 days (i.e., 0.62au, assuming a circular orbit). The system's evolutionary state (right after the dispersal of its gas-rich disk) makes it extremely valuable to learn about the process of terrestrial-planet formation and planetary architecture through future observations.2022ApJ...927..135Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/927/135CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/337 : Gaia DR1 (Gaia Collaboration, 2016)J/A+A/409/169 : UBVRI light curves of AA Tau in 1999 (Bouvier+, 2003)J/MNRAS/363/1111 : Tycho-2 stars with IR excess (Clarke+, 2005)J/ApJ/620/1010 : Spitzer 24{mu}m photometry of A dwarfs (Rieke+, 2005)J/ApJ/653/675 : Spitzer 24{mu}m photometry of A dwarfs (Su+, 2006)J/ApJ/698/1989 : Spitzer survey of NGC 2451 (Balog+, 2009)J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)J/ApJ/832/87 : Members of the young open cluster IC 2395 (Balog+, 2016)J/ApJ/836/34 : 24um excesses & membership of NGC2244 (Meng+, 2017)J/A+A/609/A116 : Low extinction TGAS HR Catalogue (Ruiz-Dern+, 2018)J/AJ/157/202 : IRAC fluxes of the ID8 and P1121 systems (Su+, 2019)J/MNRAS/496/3257 : The ASAS-SN cat. of variable stars - VIII (Bredall+, 2020)J/ApJ/898/21 : Spitzer/IRAC obs. of HD113766 & HD172555 systems (Su+, 2020)J/AJ/161/36 : Exoplanets in habitable zone with Kepler (Bryson+, 2021)J/ApJ/923/90 : LCOGT V-band monitoring of TYC 8830 410 1 (Melis+, 2021)J/ApJ/918/71 : Spitzer/IRAC phot. of V488 Persei debris disk (Rieke+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/927/135https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/927/135http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/927/135https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/927/135https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/927/135http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/927/135GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap3.9193497546148093e-20 6.185923063528282e-20InfrareddefaultJ/ApJ/927/135/tablea1The IRAC fluxes of the HD 166191 systemrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAOR[53405952/69992704] Spitzer AOR keymeta.id;obslongBMJD3.6[57187.57/58874.8] Barycentric Julian Date of 3.6um flux observationdtime.epochdoubleF3.6[651/1087] Spitzer/IRAC 3.6um band flux densitymJyphot.mag;em.IR.3-4umfloate_F3.6[1/8.5] Uncertainty in F3.6mJystat.errorfloatFIRE3.6[167/604] Spitzer/IRAC 3.6um band excess flux density, F_IRE,3.6_ (1)mJyphot.flux;arith.ratio;em.IR.3-4umfloate_FIRE3.6[7/12] Uncertainty in FIRE3.6mJystat.errorfloatBMJD4.5[57187.57/58874.8] Barycentric Julian Date of 4.5um flux observationdtime.epochdoubleF4.5[678/1155] Spitzer/IRAC 4.5um band flux densitymJyphot.mag;em.IR.4-8umfloate_F4.5[0.6/6.1] Uncertainty in F4.5mJystat.errorfloatFIRE4.5[363/840] Spitzer/IRAC 4.5um band excess flux density, F_IRE,4.5_ (1)mJyphot.flux;arith.ratio;em.IR.4-8umfloate_FIRE4.5[4/8] Uncertainty in FIRE4.5mJystat.errorfloat