/ D. Kubyshkina [et al.]> // Astrophys. J. Lett. - 2018. -
Vol. 866,
Is. 2. - Ст. L18,
DOI 10.3847/2041-8213/aae586. - Cited References:23. - We acknowledge the FFG project P853993, the FWF/NFN projects S11607-N16, S11604-N16, and the FWF projects P27256-N27 and P30949-N36. N.V.E. acknowledges support by RFBR grant No. 18-05-00195-a and 16-52-14006 ANF_a. We thank the anonymous referee for useful comments.
. - ISSN 2041-8205. - ISSN 2041-8213
РУБ Astronomy & Astrophysics
Аннотация: Studies of planetary atmospheric composition, variability, and evolution require appropriate theoretical and numerical tools to estimate key atmospheric parameters, among which the mass-loss rate is often the most important. In evolutionary studies, it is common to use the energy-limited formula, which is attractive for its simplicity but ignores important physical effects and can be inaccurate in many cases. To overcome this problem, we consider a recently developed grid of about 7000 one-dimensional upper-atmosphere hydrodynamic models computed for a wide range of planets with hydrogen-dominated atmospheres from which we extract the mass-loss rates. The grid boundaries are [1:39] M-circle plus in planetary mass, [1:10] R-circle plus in planetary radius, [300:2000] K in equilibrium temperature, [0.4:1.3] M-circle dot in host star's mass, [0.002:1.3] au in orbital separation, and about [10(26):5x10(30)] erg s(-1) in stellar X-ray and extreme ultraviolet luminosity. We then derive an analytical expression for the atmospheric mass-loss rates based on a fit to the values obtained from the grid. The expression provides the mass-loss rates as a function of planetary mass, planetary radius, orbital separation, and incident stellar high-energy flux. We show that this expression is a significant improvement to the energy-limited approximation for a wide range of planets. The analytical expression presented here enables significantly more accurate planetary evolution computations without increasing computing time.
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Scopus Держатели документа: Austrian Acad Sci, Space Res Inst, Schmiedlstr 6, A-8042 Graz, Austria.
Russian Acad Sci, Siberian Branch, Inst Computat Modelling, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Univ Vienna, Inst Astron, Turkenschanzstr 17, A-1180 Vienna, Austria.
Karl Franzens Univ Graz, Inst Phys, IGAM, Univ Pl 5, A-8010 Graz, Austria.
Доп.точки доступа: Kubyshkina, D.; Fossati, L.; Erkaev, N., V; Cubillos, P. E.; Johnstone, C. P.; Kislyakova, K. G.; Lammers, H.; Lendl, M.; Odert, P.; FFG project [P853993]; FWF/NFN projects [S11607-N16, S11604-N16]; FWF projects [P27256-N27, P30949-N36]; RFBR [18-05-00195-a, 16-52-14006 ANF_a]