Orbital dynamics of a solar sail accelerated by thermal desorption of coatings

Abstract

In this study we considered a solar sail coated with materials that undergo thermal desorption at a specific temperature, as a result of heating by solar radiation at a particular heliocentric distance. Three different scenarios, that only differ in the way the sail approaches the Sun, were analyzed and compared. In every case once the perihelion is reached, the sail coat undergoes thermal desorption. When the desorption process ends, the sail then escapes the Solar System having the conventional acceleration due to solar radiation pressure. Thermal desorption here comes as an additional source of solar sail acceleration beside traditional propulsion systems for extrasolar space exploration. The compared scenarios are the following: i. Hohmann transfer plus thermal desorption. In this scenario the sail would be carried as a payload to the perihelion with a conventional propulsion system by an Hohmann transfer from Earth's orbit to an orbit very close to the Sun (almost at 0.1 AU) and then be deployed there. ii. Elliptical transfer plus Slingshot plus thermal desorption. In this scenario the transfer occurs from Earth's orbit to Jupiter's orbit. A Jupiter's fly-by leads to the orbit close to the Sun, where the sail is deployed. iii. Two stage acceleration of the solar sail through thermal desorption. The proposed sail has two coats of the materials that undergo thermal desorption at different temperatures depending on the heliocentric distance. The first desorption occurs at the Earth orbit and provides the thrust needed to propel the solar sail toward the Sun. The second desorption is equivalent to that of the other scenarios.

Exploring the Kuiper Belt with sun-diving solar sails

“…In Ref. [10] is given the solution of Eq. ( 4) in the case when one neglects the dependence of the coefficient G(t) on time: G(t) = constant.…”

Inflation deployed torus-shaped solar sail accelerated via thermal desorption of coating

“…The corresponding analytical expressions for the velocity of the sail and the reasonability of this approximation is discussed in details in Refs. [24][25][26]. Also one should mention that the high reflectivity you want in a good solar sail is diametrically opposed to the high absorptivity you want in a coating material that's going to evaporate off.…”