Рубрики:
SOLAR-TYPE STARS
PHYSICAL PARAMETERS
EXTRASOLAR PLANETS
MAGNETIC ACTIVITY
GIANT PLANETS
HD 209458B
X-RAY
EVOLUTION
ATMOSPHERE
MODEL
Кл.слова (ненормированные):
Hot Jupiters -- CMEs -- stellar winds magnetosphere and atmosphere interaction with CME plasma -- ion loss -- CoRoT
SOLAR-TYPE STARS
PHYSICAL PARAMETERS
EXTRASOLAR PLANETS
MAGNETIC ACTIVITY
GIANT PLANETS
HD 209458B
X-RAY
EVOLUTION
ATMOSPHERE
MODEL
Кл.слова (ненормированные):
Hot Jupiters -- CMEs -- stellar winds magnetosphere and atmosphere interaction with CME plasma -- ion loss -- CoRoT
Аннотация: Atmospheric erosion due to CME-caused ion pick-up is investigated here for the first time for short periodic gas giants (so-called "Hot Jupiters") orbiting close to a star, To study the effect of encountering CMEs produced on the inagnetospheres and atmospheres of "Hot Jupiters" we model possible interaction of dense CME plasma with the exoplanet HD209458b (r(pl) = 1.43r(Jup) M(pl) = 0.69 M(jup)), which orbits a 4.0-5.0 Gyr old Sun-like star at a distance of about 0.045 AU. A numerical hydrodynamic model is applied for calculation of the upper atmospheric density and the hydrogen wind of HD209458b Lis a function of planetocentric distance. Taking into account the similarity of HD209458b's host star to Our Sun we use for the study of the ion production and loss rate of H(+) ions the solar CME plasma parameters and apply a numerical test particle model. Tidal-locking of short periodic exoplanets closely located to their host stars should result in weaker intrinsic planetary magnetic moments, as compared to those of the fast rotating Jupiter type planets at much larger orbits. It is shown that in this case the encountering CME plasma can compress the magnetospheric stand-off distance of short periodic "Hot Jupiters" down to the heights Lit which the ionization and pick-LIP of the planetary neutral atmosphere by the CME plasma flow take place. Assuming for the host star of HD209458b the same CME occurrence rate Lis on the Suit, we estimate possible total mass loss rates of HD2094581b due to its collisions with CMEs over the planet lifetime. It has been found that Under different estimations of the value of a planetary magnetic moment, HD209458b Could have lost over its lifetime the mass from 0-2 up to several times of its present mass M(pl). (c) 2006 Elsevier Ltd. All rights reserved.
Доп.точки доступа:
Khodachenko, M.L.; Lammer, H.; Lichtenegger, H.I.M.; Langmayr, D.; Erkaev, N.V.; Еркаев, Николай Васильевич; Griessmeier, J.M.; Leitner, M.; Penz, T.; Biernat, H.K.; Motschmann, U.; Rucker, H.O.