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arXiv 1410.2255astro-ph.EP
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热木星WASP-43 b的精确水吸收测量

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 Charbonn… 展开作者

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 Burrows, Gregory W. Henry, Michael Williamson, Tiffany Kataria, Derek Homeier

摘要:

水在行星大气中的丰度为行星的原始起源提供了一个关键的限制,因为水冰预计将在行星形成的核心吸积模型中发挥重要作用。然而,太阳系巨行星的含水量并不为人所知,因为水被隔离在大气层深处的云层中。相比之下,短周期的系外行星具有如此高的温度,以至于它们的大气层中有气相水,这使得测量这些物体的水丰度成为可能。我们提出了一个精确的测定水丰度的大气中的2 $M_\mathrm{Jup}$短周期系外行星WASP-43 b的基础上获得的热发射和透射光谱测量与哈勃太空望远镜。我们发现水的含量与行星温度下太阳组成气体的预期值一致(0.4- 3.5倍太阳能,1 $σ$置信度)。这一结果表明,WASP-43 b大气层的金属丰度扩展了在太阳系中观察到的行星质量较高而金属富集程度较低的趋势。

英文摘要:

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 $M_\mathrm{Jup}$ 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 (0.4-3.5x solar at 1 $σ$ 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.

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