J/ApJ/809/42ivo://CDS.VizieR/J/ApJ/809/42doi:10.26093/cds/vizier.18090042CDSCiardi D.R.van Eyken J.C.Barnes J.W.Beichman C.A.Carey S.J.,Crockett C.J.Eastman J.Johns-Krull C.M.Howell S.B.Kane S.R.,Mclane J.N.Plavchan P.Prato L.Stauffer J.van Belle G.T.,von Braun K.2017-07-10T06:37:39Z2016-01-11T14:51:47ZCDS support team

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

cds-question@unistra.fryoung-stellar-objectsinfrared-photometryradial-velocityvisible-astronomyphotometrysolar-system-planetsWe present Spitzer 4.5{mu}m light curve observations, Keck NIRSPEC radial velocity observations, and LCOGT optical light curve observations of PTFO 8-8695, which may host a Jupiter-sized planet in a very short orbital period (0.45 days). Previous work by van Eyken et al. (2012ApJ...755...42V) and Barnes et al. (2013ApJ...774...53B) predicts that the stellar rotation axis and the planetary orbital plane should precess with a period of 300-600 days. As a consequence, the observed transits should change shape and depth, disappear, and reappear with the precession. Our observations indicate the long-term presence of the transit events (>3 years), and that the transits indeed do change depth, disappear and reappear. The Spitzer observations and the NIRSPEC radial velocity observations (with contemporaneous LCOGT optical light curve data) are consistent with the predicted transit times and depths for the M*=0.34M_{sun}_ precession model and demonstrate the disappearance of the transits. An LCOGT optical light curve shows that the transits do reappear approximately 1 year later. The observed transits occur at the times predicted by a straight-forward propagation of the transit ephemeris. The precession model correctly predicts the depth and time of the Spitzer transit and the lack of a transit at the time of the NIRSPEC radial velocity observations. However, the precession model predicts the return of the transits approximately 1 month later than observed by LCOGT. Overall, the data are suggestive that the planetary interpretation of the observed transit events may indeed be correct, but the precession model and data are currently insufficient to confirm firmly the planetary status of PTFO 8-8695b.2015ApJ...809...42Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/809/42CatalogResearchIsServedByTAP VizieR generic servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/AJ/147/82 : Monitoring of disk-bearing stars in NGC 2264 (Cody+, 2014)J/ApJ/784/45 : Kepler's multiple planet candidates. III. (Rowe+, 2014)J/A+A/562/L3 : WASP-103b radial velocities and light curves (Gillon+, 2014)J/ApJ/763/41 : Kepler multiple-candidate systems radii (Ciardi+, 2013)J/ApJ/761/46 : HD 37605 radial velocities and photometry (Wang+, 2012)J/AJ/142/60 : Palomar Transient Factory Orion Project (Van Eyken+, 2011)J/ApJ/728/69 : Photoelectric photometry of V410 Tauri (Rice+, 2011)J/AJ/141/50 : White-light flares on cool Kepler stars (Walkowicz+, 2011)J/ApJ/671/1784 : Ori OB1 IRAC/MIPS observations (Hernandez+, 2007)J/ApJ/661/1119 : Spectroscopy in the 25 Ori group (Briceno+, 2007)J/AJ/129/907 : New Ori OB1 members (Briceno+, 2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/809/42https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/809/42http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/809/42https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/809/42https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/809/42http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/809/42GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfraredOpticaldefaultJ/ApJ/809/42/table3Las Cumbres Observatory Global telescope Network (LCOGT) r' light curve datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateUT date of the observationtime.epoch;obsnullableBJDBarycentic Julian Date of observationdtime.epochdoublePhasePhasetime.phasefloatOFlux[0.91/1.24] Normalized LCOGT r' band fluxphot.flux.density;em.opt.Rdoublee_OFlux[0.003/0.006] Uncertainty in OFluxstat.errordoubleMFlux[0.92/1.25] Normalized stellar model fluxphot.flux;arith.ratiodoubleO-M[-0.04/0.03] Difference between the observed and model fluxesstat.fit.residualdoubleTrans[-0.03/0]? Transit model difference to model subtracted fluxesstat.fit.residualdoublenullableJ/ApJ/809/42/table2Keck NIRSPEC radial velocity datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Date of the observationtime.epochdoublePhase[-0.3/0.3] Phasetime.phasefloatRV[-2.8/1.4] Radial velocitykm/sphys.veloc;pos.heliocentricfloate_RV[0.8/2.4] RV uncertaintykm/sstat.errorfloatJ/ApJ/809/42/table1Spitzer 4.5um light curve datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentic Julian Datedtime.epochdoublePhasePhasetime.phasefloatOFlux[0.97/1.38] Normalized Spitzer/IRAC 4.5 micron band fluxphot.mag;em.IR.4-8umdoublee_OFlux[0.003/0.04] Uncertainty in OFluxstat.errordoubleMFlux[0.99/1.006] Normalized stellar model fluxphot.flux;arith.ratiodoubleO-M[-0.03/0.4] Difference between the observed and model fluxesstat.fit.residualdoubleTrans[-0.006/0] Transit model difference to model subtracted fluxesstat.fit.residualdouble