November 1, 2007
Back in 2003, the Hubble Space Telescope was used to observe the HD 209458 b transit in the ultraviolet region of the spectrum surrounding the Lyman-alpha line. It turns out that the HD 209458 b transit has a depth of order 15% in Lyman alpha, indicating that a comet-like wind of hydrogen is flowing off the planet.
Back in 2003, the Hubble Space Telescope was used to observe the HD 209458 b transit in the ultraviolet region of the spectrum surrounding the Lyman-alpha line. It turns out that the HD 209458 b transit has a depth of order 15% in Lyman alpha, indicating that a comet-like wind of hydrogen is flowing off the planet.
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