Polarmetric Study Of Earth-Like Exoplanets And Asteroids

First of all,we review the polarization properties of solar system planets,as-teroids and Earth-like exoplanets.Then we treat the Earth as an Exoplanet,we obtained the polarization signals of'Earth-like Exoplanet'through PARASOL data.We find the maximum disk-integrated polarization degrees of Earth-like Exoplanet reach 13.13%,7.33%and 5.29%at 490nm,670nm and 865nm respec-tively,while the minimum polarization degrees are 11.36%,6.01%and 3.83%respectively;the variation amplitude is less than 2%in a diurnal spin period;the polarization magnitudes show a strong dependence on wavelength,generally speaking the shorter wavelength the larger polarization.Moreover,we modeled the polarizations of Earth-like Exoplanet,we study the polarizations of Earth-like with Exoplanet an tidally locked cloud-(sub-solar cloud)particularly.We find that for phase angle less than 100~?,the planetary reflected flux increases with the increase of cloud optical thickness;for the phase angle range of 100~?to 120~?,the flux shows no obvious variation when the cloud optical thickness increases from 2 to 10.As the cloud optical thickness increases,the maximum degree of polarization occurs at larger phase angle.As the albedo of planetary surface increases,the maximum degree of polarization occurs at larger phase an-gle.Finally,we study the relationships between asteroid polarization parameters and geometric albedo,we provide a new method to determine the more accurate geometric albedo of asteroids.The works above provide references for identify-ing the surface and atmospheric properties of planets and determining whether planets are habitable.