Hubble Space Telescope detection of oxygen in the atmosphere of exoplanet HD 189733b

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Table 2

Absorption depth of stellar emission during the HD 189733b transit.

Atoms	Wavelength (nm)	Flux drop-off^a (%)	Photon-noise error (%)	Total error bar (%)

O I	130.21 + 130.60	8.1	2.2	3.4
O I	130.4 triplet	6.4	1.8	3.4
C II	133.45 + 133.57	7.0	1.2	2.1
Si III	120.6	6.8	2.0	4.7
Si IV	139.3 +140. 3	2.6	2.5	5.6

Notes. Flux drop-off during transit of HD 189733 derived from HST/COS G130M medium-resolution observations. Total error bars include both photon noise and stellar/instrument variability. .

^(a)

The signal drop-off is derived from the data at planet orbital phase of ~0.985 sampled during transit in HST orbit 2.

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