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J/ApJ/788/92  The hot Jupiter Kepler-13Ab planet's occultation  (Shporer+, 2014)

Atmospheric characterization of the hot Jupiter Kepler-13Ab. Shporer A., O'Rourke J.G., Knutson H.A., Szabo G.M., Zhao M., Burrows A., Fortney J., Agol E., Cowan N.B., Desert J.-M., Howard A.W., Isaacson H., Lewis N.K., Showman A.P., Todorov K.O. <Astrophys. J., 788, 92 (2014)> =2014ApJ...788...92S (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Planets ; Photometry, infrared ; Spectroscopy Keywords: planetary systems - stars: early-type - stars: individual: Kepler-13, BD+46 2629 - techniques: photometric - techniques: spectroscopic Abstract: Kepler-13Ab (= KOI-13.01) is a unique transiting hot Jupiter. It is one of very few known short-period planets orbiting a hot A-type star, making it one of the hottest planets currently known. The availability of Kepler data allows us to measure the planet's occultation (secondary eclipse) and phase curve in the optical, which we combine with occultations observed by warm Spitzer at 4.5 µm and 3.6 µm and a ground-based occultation observation in the Ks band (2.1 µm). We derive a day-side hemisphere temperature of 2750±160 K as the effective temperature of a black body showing the same occultation depths. Comparing the occultation depths with one-dimensional planetary atmosphere models suggests the presence of an atmospheric temperature inversion. Our analysis shows evidence for a relatively high geometric albedo, Ag=0.33-0.06+0.04. While measured with a simplistic method, a high Ag is supported also by the fact that the one-dimensional atmosphere models underestimate the occultation depth in the optical. We use stellar spectra to determine the dilution, in the four wide bands where occultation was measured, due to the visual stellar binary companion 1.15"±0.05" away. The revised stellar parameters measured using these spectra are combined with other measurements, leading to revised planetary mass and radius estimates of Mp=4.94-8.09 MJ and Rp=1.406±0.038 RJ. Finally, we measure a Kepler midoccultation time that is 34.0±6.9 s earlier than expected based on the midtransit time and the delay due to light-travel time and discuss possible scenarios. Description: Here we carry out an atmospheric characterization of Kepler-13Ab by measuring its occultation in four different wavelength bands, from the infrared (IR; Spitzer/Infrared array camera (IRAC) 4.5 um and 3.6 um), through the near-IR (NIR; Ks band), to the optical (Kepler). We also analyze the Kepler phase curve and obtain Keck/high-resolution echelle spectrometer (HIRES) spectra that result in revised parameters for the objects in the system. Objects: ------------------------------------------------------- RA (ICRS) DE Designation(s) ------------------------------------------------------- 19 07 53.15 +46 52 05.9 Kepler-13Ab = KOI-13.01 ------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 62 3700 Spitzer 4.5 micron light curve table2.dat 62 11084 Spitzer 3.6 micron light curve table3.dat 38 1101 WIRC Ks light curve table8.dat 36 49019 Kepler-13A/Kepler-13B Flux Ratio
See also: II/295 : Spitzer IRAC survey of the galactic center (Ramirez+, 2008) V/133 : Kepler Input Catalog (Kepler Mission Team, 2009) J/A+A/508/1509 : Sky maps for hot Jupiters (Heller+, 2009) J/A+A/544/L12 : Velocitometry transit of KOI-13 (Santerne+, 2012) J/AJ/143/39 : Analysis of hot Jupiters in Kepler Q2 (Coughlin+, 2012) Byte-by-byte Description of file: table1.dat table2.dat
Bytes Format Units Label Explanations
1- 15 F15.7 d Time Barycentric Julian date of mid-exposure 17- 25 F9.5 pix Xpix X pixel coordinate 27- 35 F9.5 pix Ypix Y pixel coordinate 37- 44 F8.6 --- RFlux Raw relative flux (1) 46- 53 F8.6 --- e_RFlux Error in RFlux 55- 62 F8.6 --- DFlux Detrended relative flux (2)
Note (1): Without correcting for the intra-pixel sensitivity variations. Note (2): After removing all variabilities except the occultation.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 14 F14.6 d Time Barycentric Julian date of mid-exposure 16- 22 F7.5 --- RFlux Raw relative flux (1) 24- 30 F7.5 --- e_RFlux Error in RFlux 32- 38 F7.5 --- DFlux Detrended relative flux (2)
Note (1): Without correcting for the long term trend. Note (2): After removing the long term temporal trend.
Byte-by-byte Description of file: table8.dat
Bytes Format Units Label Explanations
1- 9 F9.3 0.1nm Wave Wavelength; Angstroms 11- 18 F8.6 --- FRatio Flux ratio 20- 27 F8.6 --- E_FRatio The 1σ upper boundary on FRatio 29- 36 F8.6 --- e_FRatio The 1σ lower boundary on FRatio
History: From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 10-Jul-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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