A precise water abundance measurement for the hot jupiter WASP-43b

Laura Kreidberg, Jacob L. Bean, Jean Michel Désert, Michael R. Line, Jonathan J. Fortney, Nikku Madhusudhan, Kevin B. Stevenson, Adam P. Showman, David Charbonneau, Peter R. McCullough, Sara Seager, Adam S. Burrows, Gregory W. Henry, Michael Williamson, Tiffany Kataria, Derek Homeier

Research output: Contribution to journalArticlepeer-review

183 Scopus citations

Abstract

The water abundance in a planetary atmosphere provides a key constraint on the planet's primordial origins because water ice is expected to play an important role in the core accretion model of planet formation. However, the water content of the solar system giant planets is not well known because water is sequestered in clouds deep in their atmospheres. By contrast, short-period exoplanets have such high temperatures that their atmospheres have water in the gas phase, making it possible to measure the water abundance for these objects. We present a precise determination of the water abundance in the atmosphere of the 2 M Jup short-period exoplanet WASP-43b based on thermal emission and transmission spectroscopy measurements obtained with the Hubble Space Telescope. We find the water content is consistent with the value expected in a solar composition gas at planetary temperatures (0.4-3.5 × solar at 1σ confidence). The metallicity of WASP-43b's atmosphere suggested by this result extends the trend observed in the solar system of lower metal enrichment for higher planet masses.

Original languageEnglish (US)
Article numberL27
JournalAstrophysical Journal Letters
Volume793
Issue number2
DOIs
StatePublished - Oct 1 2014

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • planets and satellites: atmospheres
  • planets and satellites: composition
  • planets and satellites: individual (WASP-43b)

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