J/ApJ/818/176ivo://CDS.VizieR/J/ApJ/818/176doi:10.26093/cds/vizier.18180176CDSZhou Y.Apai D.Schneider G.H.Marley M.S.Showman A.P.2017-06-19T07:58:06Z2016-05-31T12:29:50ZCDS support team

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

cds-question@unistra.frmultiple-starsinfrared-photometrysolar-system-planetsRotational modulations of brown dwarfs have recently provided powerful constraints on the properties of ultra-cool atmospheres, including longitudinal and vertical cloud structures and cloud evolution. Furthermore, periodic light curves directly probe the rotational periods of ultra-cool objects. We present here, for the first time, time-resolved high-precision photometric measurements of a planetary-mass companion, 2M1207b. We observed the binary system with Hubble Space Telescope/Wide Field Camera 3 in two bands and with two spacecraft roll angles. Using point-spread function-based photometry, we reach a nearly photon-noise limited accuracy for both the primary and the secondary. While the primary is consistent with a flat light curve, the secondary shows modulations that are clearly detected in the combined light curve as well as in different subsets of the data. The amplitudes are 1.36% in the F125W and 0.78% in the F160W filters, respectively. By fitting sine waves to the light curves, we find a consistent period of 10.7_-0.6_^+1.2^hr and similar phases in both bands. The J- and H-band amplitude ratio of 2M1207b is very similar to a field brown dwarf that has identical spectral type but different J-H color. Importantly, our study also measures, for the first time, the rotation period for a directly imaged extra-solar planetary-mass companion.2016ApJ...818..176Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/818/176CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/814/65 : Jupiter HST light curves (Karalidi+, 2015)J/MNRAS/444/711 : Photometric distances of exoplanets (Triaud+, 2014)J/A+A/562/A127 : NIR integral field spectra of 15 M-L dwarfs (Bonnefoy+, 2014)J/ApJS/208/9 : Intrinsic colors & temperatures of PMS stars (Pecaut+, 2013)J/ApJ/773/168 : Submm fluxes of very low-mass stars and BDs (Mohanty+, 2013)J/ApJ/747/35 : HST/WFC3 transit observation of GJ1214b (Berta+, 2012)J/A+A/517/A76 : Near-IR spectrum of 2M1207b (Patience+, 2010)J/ApJ/689/1295 : Lithium test implications for BDs (Kirkpatrick+, 2008)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/818/176https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/818/176http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/818/176https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/818/176https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/818/176http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/818/176GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfrareddefaultJ/ApJ/818/176/table1HST/WFC3 F125W photometry resultsOrbit[1/6] Orbit number (1)meta.id;obsintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPA[202/227] Position angledegpos.posAngintDither[1/4] Dither position (2)meta.codeintTime[0/9] Time from start of the observationshtime.epochfloatFlux[62867/78848] Primary flux in electrons/sct/sphot.countdoubleNFlux[0.98/1.01] Normalized primary fluxphot.flux;arith.ratiofloatCFlux[180/328] Companion flux in electrons/sct/sphot.countfloatNCFlux[0.95/1.05] Normalized companion fluxphot.flux;arith.ratiofloatJ/ApJ/818/176/table2HST/WFC3 F160W photometry resultsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintOrbit[1/6] Orbit number (1)meta.id;obsintPA[202/227] Position angledegpos.posAngintDither[1/4] Dither position (2)meta.codeintTime[0/9] Time from start of the observationshtime.epochfloatFlux[62867/78848] Primary flux in electrons/sct/sphot.countdoubleNFlux[0.98/1.01] Normalized primary fluxphot.flux;arith.ratiofloatCFlux[180/328] Companion flux in electrons/sct/sphot.countfloatNCFlux[0.95/1.05] Normalized companion fluxphot.flux;arith.ratiofloat