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Time-series analysis of broadband photometry of Neptune from K2

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  • Additional Information
    • Contributors:
      Institut Trottier de Recherche sur les Exoplanètes (iREx); Université de Montréal (UdeM); New Mexico State University; New Mexico Consortium (NMC); Apache point observatory; NASA Ames Research Center (ARC); NASA Goddard Space Flight Center (GSFC); Association of Universities for Research in Astronomy (AURA); Stellar Astrophysics Centre Aarhus (SAC); Aarhus University Aarhus; Bay Area Environmental Research Institute (BAER); NYUAD Center for Space Science; New York University Abu Dhabi; NYU System (NYU)-NYU System (NYU); Institut d'astrophysique spatiale (IAS); Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales Paris (CNES); Search for Extraterrestrial Intelligence Institute (SETI Institute); Department of Physics and Astronomy Leicester; University of Leicester; School of Physics and Astronomy Birmingham; University of Birmingham Birmingham; Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)); Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité); Universidad de La Laguna Tenerife - SP (ULL); University of California Santa Cruz (UC Santa Cruz); University of California (UC); Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU); Université Paris-Saclay-Direction de Recherche Fondamentale (CEA) (DRF (CEA)); Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA); University of Delaware Newark; NASA Ames Research Center Cooperative for Research in Earth Science in Technology (ARC-CREST); Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics (LESIA); Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris; Centre National de la Recherche Scientifique (CNRS)-Université Paris Sciences et Lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Sciences et Lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité); Joseph Louis LAGRANGE (LAGRANGE); Université Nice Sophia Antipolis (1965 - 2019) (UNS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur; Université Côte d'Azur (UniCA)-Université Côte d'Azur (UniCA)-Centre National de la Recherche Scientifique (CNRS); European Project: 267864,ERC-2010-AdG_20100224,ERC-2010-AdG_20100224,ASTERISK(2011)
    • Publication Information:
      CCSD
      American Astronomical Society
    • Publication Date:
      2017
    • Collection:
      HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives)
    • Abstract:
      International audience ; 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.
    • Relation:
      info:eu-repo/semantics/altIdentifier/arxiv/1702.02943; info:eu-repo/grantAgreement//267864/EU/ASTERoseismic Investigations with SONG and Kepler/ASTERISK; ARXIV: 1702.02943
    • Accession Number:
      10.3847/1538-3881/aa6119
    • Online Access:
      https://hal-obspm.ccsd.cnrs.fr/obspm-02190193
      https://hal-obspm.ccsd.cnrs.fr/obspm-02190193v1/document
      https://hal-obspm.ccsd.cnrs.fr/obspm-02190193v1/file/1702.02943.pdf
      https://doi.org/10.3847/1538-3881/aa6119
    • Rights:
      info:eu-repo/semantics/OpenAccess
    • Accession Number:
      edsbas.F7F8C348