NEPTUNE'S DYNAMIC ATMOSPHERE from KEPLER K2 OBSERVATIONS: IMPLICATIONS for BROWN DWARF LIGHT CURVE ANALYSES

Amy A. Simon, Jason F. Rowe, Patrick Gaulme, Heidi B. Hammel, Sarah L. Casewell, Jonathan J. Fortney, John E. Gizis, Jack J. Lissauer, Raul Morales-Juberias, Glenn S. Orton, Michael H. Wong, Mark S. Marley

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

Observations of Neptune with the Kepler Space Telescope yield a 49 day light curve with 98% coverage at a 1 minute cadence. A significant signature in the light curve comes from discrete cloud features. We compare results extracted from the light curve data with contemporaneous disk-resolved imaging of Neptune from the Keck 10-m telescope at 1.65 microns and Hubble Space Telescope visible imaging acquired nine months later. This direct comparison validates the feature latitudes assigned to the K2 light curve periods based on Neptune's zonal wind profile, and confirms observed cloud feature variability. Although Neptune's clouds vary in location and intensity on short and long timescales, a single large discrete storm seen in Keck imaging dominates the K2 and Hubble light curves; smaller or fainter clouds likely contribute to short-term brightness variability. The K2 Neptune light curve, in conjunction with our imaging data, provides context for the interpretation of current and future brown dwarf and extrasolar planet variability measurements. In particular we suggest that the balance between large, relatively stable, atmospheric features and smaller, more transient, clouds controls the character of substellar atmospheric variability. Atmospheres dominated by a few large spots may show inherently greater light curve stability than those which exhibit a greater number of smaller features.

Original languageEnglish (US)
Article number162
JournalAstrophysical Journal
Volume817
Issue number2
DOIs
StatePublished - Feb 1 2016
Externally publishedYes

Keywords

  • brown dwarfs
  • planets and satellites: atmospheres
  • planets and satellites: gaseous planets
  • stars: oscillations (including pulsations)
  • stars: rotation
  • starspots

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint

Dive into the research topics of 'NEPTUNE'S DYNAMIC ATMOSPHERE from KEPLER K2 OBSERVATIONS: IMPLICATIONS for BROWN DWARF LIGHT CURVE ANALYSES'. Together they form a unique fingerprint.

Cite this