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J/AJ/153/149        Broadband photometry of Neptune from K2        (Rowe+, 2017)

Time-series analysis of broadband photometry of Neptune from K2. Rowe J.F., Gaulme P., Lissauer J.J., Marley M.S., Simon A.A., Hammel H.B., Silva Aguirre V., Barclay T., Benomar O., Boumier P., Caldwell D.A., Casewell S.L., Chaplin W.J., Colon K.D., Corsaro E., Davies G.R., Fortney J.J., Garcia R.A., Gizis J.E., Haas M.R., Mosser B., Schmider F.-X. <Astron. J., 153, 149-149 (2017)> =2017AJ....153..149R (SIMBAD/NED BibCode)
ADC_Keywords: Planets ; Photometry Keywords: planetary systems - planets and satellites: gaseous planets Abstract: We report here on our search for excess power in photometry of Neptune collected by the K2 mission that may be due to intrinsic global oscillations of the planet Neptune. To conduct this search, we developed new methods to correct for instrumental effects such as intrapixel variability and gain variations. We then extracted and analyzed the time-series photometry of Neptune from 49 days of nearly continuous broadband photometry of the planet. We find no evidence of global oscillations and place an upper limit of ∼5ppm at 1000µHz for the detection of a coherent signal. With an observed cadence of 1 minute and a point-to-point scatter of less than 0.01%, the photometric signal is dominated by reflected light from the Sun, which is in turn modulated by atmospheric variability of Neptune at the 2% level. A change in flux is also observed due to the increasing distance between Neptune and the K2 spacecraft and the solar variability with convection-driven solar p modes present. Description: The K2 C3 field provided the first opportunity to observe the planet Neptune for up to 80 days with short-cadence (1 minute) sampling (the C3 campaign had an actual duration of 69.2 days, limited by on-board data storage). We were awarded sufficient pixel allocation from Guest Observer Programs GO3060 (PI: Rowe) and GO3057 (PI: Gaulme) to continuously monitor Neptune for 49 days. Short-cadence target pixel files were obtained from Mikulski Archive for Space Telescopes (MAST). The Neptune short-cadence subraster was spread across 161 FITS files. Each file contained 1 column of time-series pixel data. Each target pixel file contains observations starting on 2014 November 15 and finishing on 2015 January 18. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 28 68481 Adopted photometry
See also: J/ApJ/784/45 : Kepler's multiple planet candidates. III. (Rowe+, 2014) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 11 F11.8 d BJD [16.4/65.42] Offset Barycentric Julian Date (BJD-2456977.10319595) 13- 20 F8.5 --- Flux [-0.0185/0.026] Adopted distance corrected photometry 22- 28 F7.5 --- e_Flux [0.00035/0.00036] Uncertainty in Flux
History: From electronic version of the journal
(End) Prepared by [AAS]; Sylvain Guehenneux [CDS] 01-Aug-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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