4.8 Article

Thermal structure of an exoplanet atmosphere from phase-resolved emission spectroscopy

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SCIENCE
卷 346, 期 6211, 页码 838-841

出版社

AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1256758

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资金

  1. NASA [NAS 5-26555]
  2. STScI [GO-13467]
  3. NASA through STScI
  4. Sagan Fellowship Program
  5. NASA
  6. Alfred P. Sloan Foundation through a Sloan Research Fellowship
  7. NSF through a Graduate Research Fellowship
  8. NSF
  9. Tennessee State University
  10. State of Tennessee through its Centers of Excellence program
  11. Massachusetts Institute of Technology
  12. European Research Council under the European Community [247060]

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Exoplanets that orbit close to their host stars are much more highly irradiated than their solar system counterparts. Understanding the thermal structures and appearances of these planets requires investigating how their atmospheres respond to such extreme stellar forcing. We present spectroscopic thermal emission measurements as a function of orbital phase (phase-curve observations) for the highly irradiated exoplanet WASP-43b spanning three full planet rotations using the Hubble Space Telescope. With these data, we construct a map of the planet's atmospheric thermal structure, from which we find large day-night temperature variations at all measured altitudes and a monotonically decreasing temperature with pressure at all longitudes. We also derive a Bond albedo of 0.18(-0.12)(+0.07) and an altitude dependence in the hot-spot offset relative to the substellar point.

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