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Model Bond Albedos of Extrasolar Giant Planets

机译:太阳系超大行星的邦德反照率模型

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摘要

The atmospheres of extrasolar giant planets are modeled with various effective temperatures and gravities, with and without clouds. Bond albedos are computed by calculating the ratio of the flux reflected by a planet (integrated over wavelength) to the total stellar flux incident on the planet. This quantity is useful for estimating the effective temperature and evolution of a planet. We find it is sensitive to the stellar type of the primary. For a 5 M_(Jup) planet the Bond albedo varies from 0.4 to 0.3 to 0.06 as the primary star varies from A5V to G2V to M2V in spectral type. It is relatively insensitive to the effective temperature and gravity for cloud-free planets. Water clouds increase the reflectivity of the planet in the red, which increases the Bond albedo. The Bond albedo increases by an order of magnitude for a 13 M_(Jup) planet with an M2V primary when water clouds are present. silicate clouds, on the other hand, can either increase or decrease the Bond albedo, depending on whether there are many small grains (the former) or few large grains (the latter).
机译:太阳系外巨型行星的大气层是在各种有效温度和重力作用下(有无云)进行建模的。通过计算行星反射的通量(在波长上积分)与入射到该行星上的总恒星通量之比,可以计算出结合反照率。此数量可用于估算行星的有效温度和演化。我们发现它对初级的恒星类型敏感。对于5 M_(Jup)行星,邦德反照率在0.4至0.3至0.06之间变化,因为主星在光谱类型上从A5V到G2V到M2V变化。它对无云行星的有效温度和重力相对不敏感。水云增加了红色行星的反射率,从而增加了邦德反照率。当存在水云时,对于以M2V为主的13 M_(Jup)行星,邦德反照率会增加一个数量级。另一方面,硅酸盐云可以增加或减少邦德反照率,这取决于是存在许多小晶粒(前者)还是很少有大晶粒(后者)。

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