J/ApJ/767/64ivo://CDS.VizieR/J/ApJ/767/64doi:10.26093/cds/vizier.17670064CDSRogers J.Lopez-Morales M.Apai D.Adams E.2017-07-06T06:25:38Z2014-12-17T08:15:35ZCDS support team

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

cds-question@unistra.frsolar-system-planetsmultiple-starsastronomical-modelsphotometryGround-based observations of exoplanet eclipses provide important clues to the planets' atmospheric physics, yet systematics in light curve analyses are not fully understood. It is unknown if measurements suggesting near-infrared flux densities brighter than models predict are real, or artifacts of the analysis processes. We created a large suite of model light curves, using both synthetic and real noise, and tested the common process of light curve modeling and parameter optimization with a Markov Chain Monte Carlo algorithm. With synthetic white noise models, we find that input eclipse signals are generally recovered within 10% accuracy for eclipse depths greater than the noise amplitude, and to smaller depths for higher sampling rates and longer baselines. Red noise models see greater discrepancies between input and measured eclipse signals, often biased in one direction. Finally, we find that in real data, systematic biases result even with a complex model to account for trends, and significant false eclipse signals may appear in a non-Gaussian distribution. To quantify the bias and validate an eclipse measurement, we compare both the planet-hosting star and several of its neighbors to a separately chosen control sample of field stars. Re-examining the Rogers et al. (2009, J/ApJ/707/1707) Ks-band measurement of CoRoT-1b finds an eclipse 3190_-440_^+370^ppm deep centered at {phi}_me_=0.50418_-0.00203_^+0.00197^. Finally, we provide and recommend the use of selected data sets we generated as a benchmark test for eclipse modeling and analysis routines, and propose criteria to verify eclipse detections.2013ApJ...767...64Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/767/64CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/corot : CoRoT observation log Release 13 (CoRoT, 2009-2014)J/AJ/143/39 : Analysis of hot Jupiters in Kepler Q2 (Coughlin+, 2012)J/A+A/530/A5 : WASP-4b Ks-band detection of thermal emission (Caceres+, 2011)J/A+A/528/A49 : HAT-P-1b Ks-band secondary eclipse (de Mooij +, 2011)J/A+A/513/L3 : Exoplanet WASP-19b H-band thermal emission (Anderson+, 2010)J/ApJ/707/1707 : Ks-band light curve of CoRoT-1b (Rogers+, 2009)J/A+A/506/359 : FORS2 and HAWKI photometry of CoRoT-1 (Gillon+, 2009)J/A+A/482/L17 : CoRoT space mission. I. (Barge+, 2008)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/767/64https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/767/64http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/767/64https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/767/64https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/767/64http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/767/64GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/767/64/table11Data sets R1, R2 and R3: real noiserecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTypeDataset description code (1)meta.codeintPhaseOrbital phasetime.phasedoubleOFlux[0.984/1.019] Observed fluxphot.flux;meta.modelledfloate_OFlux[0.003/0.007] Error in OFluxstat.errorfloatEShape[1/1.004] Noiseless eclipse shape (G1)stat.paramfloatNBase[0.98/1.02] Combined noise baseinstr.det.noisefloatOPos[0/1]? Offset position (2)meta.codeintnullableAirM[1.2/1.8] Airmassobs.airMassfloatFWHM[10.4/12.1] Full-width at Half-Maximum of stellar imagepixphys.angSizefloatxDist[-6.1/6.9] X-position on the chippixpos.cartesian.x;instr.detfloatyDist[-4.4/6.8] Y-position on the chippixpos.cartesian.y;instr.detfloatSky[-63/58] Sky brightnessct/pixphot.mag.sbfloatJ/ApJ/767/64/table10Data sets S1-S7: synthetic noiserecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTypeDataset description code (1)meta.codeintPhase[0.33/0.67] Orbital phasetime.phasedoubleOFlux[0.995/1.009] Observed fluxphot.flux;meta.modelleddoublee_OFlux[0/0.002] Error in OFluxstat.errordoubleEShapeNoiseless eclipse shape (G1)stat.paramdoubleNBaseCombined noise baseinstr.det.noisedoubleWNoiseWhite noise componentsinstr.det.noisedoubleRNoiseRed noise componentsinstr.det.noisedouble