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Title: Time-Series Analysis of Broadband Photometry of Neptune from K2
Authors: Rowe, Jason F.
Gaulme, Patrick
Lissauer, Jack J.
Marley, Mark S.
Simon, Amy A.
Hammel, Heidi B.
Aguirre, Víctor Silva
Barclay, Thomas
Benomar, Othman
Boumier, Patrick
Caldwell, Douglas A.
Casewell, Sarah L.
Chaplin, William J.
Colón, Knicole D.
Corsaro, Enrico
Davies, G.R.
Fortney, Jonathan J.
Garcia, Rafael A.
Gizis, John E.
Haas, Michael R.
Mosser, Benoît
Schmider, François-Xavier
First Published: 10-Mar-2017
Publisher: American Astronomical Society, IOP Publishing
Citation: The Astronomical Journal, 2017, 153(4)
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 ~5 ppm at 1000 µHz for the detection of a coherent signal. With an observed cadence of 1-minute and point-to-point scatter 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 solar variability with convection-driven solar p modes present.
DOI Link: 10.3847/1538-3881/aa6119
ISSN: 0004-6256
eISSN: 1538-3881
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2017, American Astronomical Society, IOP Publishing. Deposited with reference to the publisher’s open access archiving policy.
Description: Software: allmost (Rowe et al. 2006, 2008), montage2 (Stetson 1987), L-BFGS-B code (Zhu et al. 1997) 31 pages, 6 figure, accepted for publication in AJ The file associated with this record is under embargo until publication, in accordance with the publisher's self-archiving policy. The full text may be available through the publisher.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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