期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 772, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/772/2/L16
关键词
planets and satellites: atmospheres; stars: individual (HD 189733); techniques: photometric
资金
- Association of Universities for Research in Astronomy, Inc.
- NASA [NAS 5-26555]
- STFC [ST/J001627/1, ST/G002266/1, ST/K00106X/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/G002266/1, ST/J001627/1, ST/K00106X/1] Funding Source: researchfish
We present a secondary eclipse observation for the hot Jupiter Jupiter HD 189733b across the wavelength range 290-570 nm made using the Space Telescope Imaging Spectrograph on the Hubble Space Telescope. We measure geometric albedos of A(g) = 0.40 +/- 0.12 across 290-450 nm and A(g) < 0.12 across 450-570 nm at 1 sigma confidence. The albedo decrease toward longer wavelengths is also apparent when using six wavelength bins over the same wavelength range. This can be interpreted as evidence for optically thick reflective clouds on the dayside hemisphere with sodium absorption suppressing the scattered light signal beyond similar to 450 nm. Our best-fit albedo values imply that HD 189733b would appear a deep blue color at visible wavelengths.
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