Detection of Oxygen and Carbon in the Hydrodynamically Escaping Atmosphere of the Extrasolar Planet HD 209458b

@article{VidalMadjar2004DetectionOO,
  title={Detection of Oxygen and Carbon in the Hydrodynamically Escaping Atmosphere of the Extrasolar Planet HD 209458b},
  author={Alfred Vidal-Madjar and J.-M. D'esert and Alain Lecavelier des Etangs and Guillaume H'ebrard and Gilda E. Ballester and David Ehrenreich and Roger Ferlet and John C. McConnell and Michel Mayor and Christopher D. Parkinson},
  journal={The Astrophysical Journal Letters},
  year={2004},
  volume={604},
  pages={L69 - L72}
}
Four transits of the planet orbiting the star HD 209458 were observed with the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope. The wavelength domain (1180-1710 Å) includes H I as well as C I, C II, C IV, N V, O I, S I, Si II, Si III, and Si IV lines. During the transits, absorptions are detected in H I, O I, and C II (5% ± 2%, 13% ± 4.5%, and 7.5% ± 3.5%, respectively). No absorptions are detected for other lines. The 5% mean absorption over the whole H I Lyα line is… 

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References

SHOWING 1-10 OF 14 REFERENCES

A New Measurement of the Electron Density in the Local Interstellar Medium

Using the echelle-A grating of the Goddard High-Resolution Spectrograph, we have observed the C II λλ1335, 1336 emission lines of the nearby (d = 13.3 pc) star system Capella (G8 III + G1 III).

Detection of an Extrasolar Planet Atmosphere

We report high-precision spectrophotometric observations of four planetary transits of HD 209458, in the region of the sodium resonance doublet at 589.3 nm. We find that the photometric dimming

Source of Atomic Hydrogen in the Atmosphere of HD 209458b

Atomic hydrogen loss at the top of HD 209458b's atmosphere has been recently suggested (Vidal-Madjar et al.). We have developed a one-dimensional model to study the chemistry in the upper atmosphere

The Spectroscopic Orbit of the Planetary Companion Transiting HD 209458

TLDR
A spectroscopic orbit with period P=3.52433+/-0.00027 days for the planetary companion that transits the solar-type star HD 209458 is reported, based on a new analysis of the iron lines in the HIRES template spectrum and also on the absolute magnitude, effective temperature, and color of the star.

A Transiting “51 Peg-like” Planet

Doppler measurements from Keck exhibit a sinusoidal periodicity in the velocities of the G0 dwarf HD 209458, having a semiamplitude of 81 m s-1 and a period of 3.5239 days, which is indicative of a

Atmospheric Loss of Exoplanets Resulting from Stellar X-Ray and Extreme-Ultraviolet Heating

Past studies addressing the thermal atmospheric escape of hydrogen from "hot Jupiters" have been based on the planet's effective temperature, which, as we show here, is not physically relevant for

Orbital Evolution and Migration of Giant Planets: Modeling Extrasolar Planets

Giant planets in circumstellar disks can migrate inward from their initial (formation) positions. Radial migration is caused by inward torques between the planet and the disk, by outward torques

Theory of Planetary Atmospheres: An Introduction to Their Physics and Chemistry

This textbook describes the entire field of atmospheric physics for Earth and the planets, from surface levels to just below the magnetospheres. The protean talents of the authors have led to seven

An extended upper atmosphere around the extrasolar planet HD209458b

TLDR
The detection of atomic hydrogen absorption in the stellar Lyman α line during three transits of HD209458b is reported, showing that this absorption should take place beyond the Roche limit and therefore can be understood in terms of escaping hydrogen atoms.

Detection of Planetary Transits Across a Sun-like Star

TLDR
High-precision, high-cadence photometric measurements of the star HD 209458 are reported, which is known from radial velocity measurements to have a planetary-mass companion in a close orbit and the detailed shape of the transit curve due to both the limb darkening of thestar and the finite size of the planet is clearly evident.