Time-series analysis of broadband photometry of Neptune from K2
Jason Rowe
(1)
,
Patrick Gaulme
(2, 3)
,
Jack L. Lissauer
(4)
,
Mark S. Marley
(4)
,
Amy A. Simon
(5)
,
Heidi B. Hammel
(6)
,
Victor Silva Aguirre
(7)
,
Thomas Barclay
(8)
,
Othman Benomar
(9)
,
Patrick Boumier
(10)
,
Douglas A. Caldwell
(11)
,
Sarah L. Casewell
(12)
,
William J. Chaplin
(13, 7)
,
Knicole D. Colón
(8)
,
Enrico Corsaro
(14, 15)
,
G. R. Davies
(7, 13)
,
Jonathan J. Fortney
(16)
,
Rafael A. Garcia
(17)
,
John E. Gizis
(18)
,
Michael R. Haas
(19)
,
Benoît Mosser
(20)
,
François-Xavier Schmider
(21)
1
iREX -
Institut de Recherche sur les Exoplanètes
2 New Mexico State University
3 Apache point observatory
4 ARC - NASA Ames Research Center
5 GSFC - NASA Goddard Space Flight Center
6 AURA - Association of Universities for Research in Astronomy
7 SAC - Stellar Astrophysics Centre [Aarhus]
8 BAER - Bay Area Environmental Research Institute
9 NYUAD Center for Space Science
10 IAS - Institut d'astrophysique spatiale
11 SETI - Search for Extraterrestrial Intelligence Institute
12 Department of Physics and Astronomy [Leicester]
13 School of Physics and Astronomy [Birmingham]
14 AIM (UMR_7158 / UMR_E_9005 / UM_112) - Astrophysique Interprétation Modélisation
15 ULL - Universidad de La Laguna [Tenerife - SP]
16 UC Santa Cruz - University of California [Santa Cruz]
17 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
18 University of Delaware [Newark]
19 ARC-CREST - NASA Ames Research Center Cooperative for Research in Earth Science in Technology
20 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics
21 LAGRANGE - Joseph Louis LAGRANGE
2 New Mexico State University
3 Apache point observatory
4 ARC - NASA Ames Research Center
5 GSFC - NASA Goddard Space Flight Center
6 AURA - Association of Universities for Research in Astronomy
7 SAC - Stellar Astrophysics Centre [Aarhus]
8 BAER - Bay Area Environmental Research Institute
9 NYUAD Center for Space Science
10 IAS - Institut d'astrophysique spatiale
11 SETI - Search for Extraterrestrial Intelligence Institute
12 Department of Physics and Astronomy [Leicester]
13 School of Physics and Astronomy [Birmingham]
14 AIM (UMR_7158 / UMR_E_9005 / UM_112) - Astrophysique Interprétation Modélisation
15 ULL - Universidad de La Laguna [Tenerife - SP]
16 UC Santa Cruz - University of California [Santa Cruz]
17 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
18 University of Delaware [Newark]
19 ARC-CREST - NASA Ames Research Center Cooperative for Research in Earth Science in Technology
20 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics
21 LAGRANGE - Joseph Louis LAGRANGE
Jason Rowe
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- Function : Correspondent author
- PersonId : 1123593
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Patrick Gaulme
- Function : Author
- PersonId : 832706
Victor Silva Aguirre
- Function : Author
- PersonId : 765483
- ORCID : 0000-0002-6137-903X
Thomas Barclay
- Function : Author
- PersonId : 771374
- ORCID : 0000-0001-7139-2724
William J. Chaplin
- Function : Author
- PersonId : 943470
François-Xavier Schmider
- Function : Author
- PersonId : 739354
- IdHAL : f-x-schmider
- ORCID : 0000-0003-3914-3546
- IdRef : 050412787
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 $\mu$Hz 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.