Magnetic moment and plasma environment of HD 209458b as determined from Lyα observations

@article{Kislyakova2014MagneticMA,
  title={Magnetic moment and plasma environment of HD 209458b as determined from Ly$\alpha$ observations},
  author={Kristina G. Kislyakova and Mats Holmstr{\"o}m and Helmut Lammer and Petra Odert and M. L. Khodachenko},
  journal={Science},
  year={2014},
  volume={346},
  pages={981 - 984}
}
Transit observations of HD 209458b in the stellar Lyman-α(Lyα) line revealed strong absorption in both blue and red wings of the line interpreted as hydrogen atoms escaping from the planet’s exosphere at high velocities. The following sources for the absorption were suggested: acceleration by the stellar radiation pressure, natural spectral line broadening, or charge exchange with the stellar wind. We reproduced the observation by means of modeling that includes all aforementioned processes… Expand
Lyα Absorption at Transits of HD 209458b: A Comparative Study of Various Mechanisms Under Different Conditions
To shed more light on the nature of the observed Ly{\alpha} absorption during transits of HD 209458b and to quantify the major mechanisms responsible for the production of fast hydrogen atoms (the soExpand
The impact of intrinsic magnetic field on the absorption signatures of elements probing the upper atmosphere of HD209458b
The signs of an expanding atmosphere of HD209458b have been observed with far-ultraviolet transmission spectroscopy and in the measurements of transit absorption by metastable He i. TheseExpand
How expanded ionospheres of Hot Jupiters can prevent escape of radio emission generated by the cyclotron maser instability
We present a study of plasma conditions in the atmospheres of the Hot Jupiters HD 209458b and HD 189733b and for an HD 209458b like planet at orbit locations between 0.2 and 1 au around a Sun-likeExpand
Characterization of the HD 219134 multiplanet system I. Observations of stellar magnetism, wind, and high-energy flux
HD 219134 hosts several planets, with seven candidates reported, and the two shortest period planets are rocky (4-5 $M_{\oplus}$) and transit the star. Here we present contemporaneousExpand
Modeling the Lyα transit absorption of the hot Jupiter HD 189733b
Hydrogen-dominated atmospheres of hot exoplanets expand and escape due to the intense heating by the X-ray and extreme ultraviolet (XUV) irradiation of their host stars. Excess absorption of neutralExpand
Near-ultraviolet Transmission Spectroscopy of HD 209458b: Evidence of Ionized Iron Beyond the Planetary Roche Lobe
The inflated transiting hot Jupiter HD 209458b is one of the best studied objects since the beginning of exoplanet characterization. Transmission observations of this system between the mid infraredExpand
Radiative braking in the extended exosphere of GJ436b
The recent detection of a giant exosphere surrounding the warm Neptune GJ436 b has shed new light on the evaporation of close-in planets, revealing that moderately irradiated, low-mass exoplanetsExpand
An evaporating planet in the wind: stellar wind interactions with the radiatively braked exosphere of GJ 436 b
Observations of the warm Neptune GJ 436 b were performed with HST/STIS at three different epochs (2012, 2013, 2014) in the stellar Lyman- α line. They showed deep, repeated transits that wereExpand
Pulsations in the atmospheres of hot Jupiters possessing magnetic fields
The discovery of the possible existence of huge quasi-stationary envelopes around a number of hot Jupiters (i.e., with sizes appreciably exceeding their Roche lobes) and the need to correctly takeExpand
Magnetic field strengths of hot Jupiters from signals of star–planet interactions
Evidence of star–planet interactions in the form of planet-modulated chromospheric emission has been noted for a number of hot Jupiters. Magnetic star–planet interactions involve the release ofExpand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 45 REFERENCES
ENERGETIC NEUTRAL ATOMS AROUND HD 209458b: ESTIMATIONS OF MAGNETOSPHERIC PROPERTIES
HD 209458b is an exoplanet found to transit the disk of its parent star. Observations have shown a broad absorption signature about the Lyα stellar line during transit, suggesting the presence of aExpand
Energetic neutral atoms as the explanation for the high-velocity hydrogen around HD 209458b
TLDR
It is shown that the measured transit-associated Lyα absorption can be explained by the interaction between the exosphere of HD 209458b and the stellar wind, and that radiation pressure alone cannot explain the observations. Expand
3D model of hydrogen atmospheric escape from HD 209458b and HD 189733b: radiative blow-out and stellar wind interactions
Transit observations in Ly-alpha of HD209458b and HD189733b revealed signatures of neutral hydrogen escaping the planets. We present a 3D particle model of the dynamics of the escaping atoms, andExpand
ON THE EXISTENCE OF ENERGETIC ATOMS IN THE UPPER ATMOSPHERE OF EXOPLANET HD209458b
Stellar irradiation and particle forcing strongly affect the immediate environment of extrasolar giant planets orbiting near their parent stars. However, it is not clear how the energy is depositedExpand
The effect of tidal locking on the magnetospheric and atmospheric evolution of ``Hot Jupiters''
We study the interaction between the planetary magnetosphere and atmosphere of the close-in extrasolar planets HD 209458b and OGLE-TR-56b with the stellar wind during the evolution of their hostExpand
Colliding planetary and stellar winds: charge exchange and transit spectroscopy in neutral hydrogen
When transiting their host stars, hot Jupiters absorb about 10% of the light in the wings of the stellar Lyman-alpha emission line. The absorption occurs at wavelengths Doppler-shifted from lineExpand
Exoplanet HD 209458b: Inflated Hydrogen Atmosphere but No Sign of Evaporation
Many extrasolar planets orbit closely to their parent star. Their existence raises the fundamental problem of loss and gain in their mass. For exoplanet HD 209458b, reports on an unusually extendedExpand
LYα TRANSIT SPECTROSCOPY AND THE NEUTRAL HYDROGEN TAIL OF THE HOT NEPTUNE GJ 436b
To date, more than 750 planets have been discovered orbiting stars other than the Sun. Two sub-classes of these exoplanets, "hot Jupiters" and their less massive counterparts "hot Neptunes," provideExpand
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. Expand
MAGNETOSPHERES OF " HOT JUPITERS " : THE IMPORTANCE OF MAGNETODISKS IN SHAPING A MAGNETOSPHERIC OBSTACLE
Weak intrinsic magnetic dipole moments of tidally locked close-in giant exoplanets (" hot Jupiters ") have been shown in previous studies to be unable to provide an efficient magnetosphericExpand
...
1
2
3
4
5
...