Рубрики:
X-RAY-EMISSION
HOT JUPITERS
ESCAPING ATMOSPHERE
GIANT PLANETS
ACTIVE
Кл.слова (ненормированные):
stars: low mass -- stars: late type -- planets and satellites: general
X-RAY-EMISSION
HOT JUPITERS
ESCAPING ATMOSPHERE
GIANT PLANETS
ACTIVE
Кл.слова (ненормированные):
stars: low mass -- stars: late type -- planets and satellites: general
Аннотация: The K2-33 planetary system hosts one transiting similar to 5 R-circle plus planet orbiting the young M-type host star. The planet's mass is still unknown, with an estimated upper limit of 5.4 M-J. The extreme youth of the system (< 20 Myr) gives the unprecedented opportunity to study the earliest phases of planetary evolution, at a stage when the planet is exposed to an extremely high level of high-energy radiation emitted by the host star. We perform a series of 1D hydrodynamic simulations of the planet's upper atmosphere considering a range of possible planetary masses, from 2 to 40 M-circle plus, and equilibrium temperatures, from 850 to 1300 K, to account for internal heating as a result of contraction. We obtain temperature profiles mostly controlled by the planet's mass, while the equilibrium temperature has a secondary effect. For planetary masses below 7-10 M-circle plus, the atmosphere is subject to extremely high escape rates, driven by the planet's weak gravity and high thermal energy, which increase with decreasing mass and/or increasing temperature. For higher masses, the escape is instead driven by the absorption of the high-energy stellar radiation. A rough comparison of the timescales for complete atmospheric escape and age of the system indicates that the planet is more massive than 10 M-circle plus.
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Держатели документа:
Austrian Acad Sci, Space Res Inst, Schmiedlstr 6, A-8042 Graz, Austria.
Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany.
SB RAS, FRC Krasnoyarsk Sci Ctr, Inst Computat Modelling, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Univ Vienna, Dept Astrophys, Turkenschanzstr 17, A-1180 Vienna, Austria.
Доп.точки доступа:
Kubyshkina, D.; Lendl, M.; Fossati, L.; Cubillos, P. E.; Lammer, H.; Erkaev, N. V.; Johnstone, C. P.; Austrian Forschungsforderungsgesellschaft FFG project "TAPAS4CHEOPS" [P853993]; Austrian Science Fund (FWF) NFN project [S11607-N16]; FWF project [P27256-N27]; RFBR grant [15-05-00879-a, 16-52-14006 ANF_a]