Suppose that you want to say that you have put your wet shirt outside so that the sunlight dries it off. Now if you want to mention the sunlight in your sentence with a prepositional phrase, how would you word it? I have come up with the following sentences:

1. I have put my wet shirt outside to dries off under the sun.
2. I have put my wet shirt outside in the sunlight [ without the? ] to dry off.

It seems that, in the sun light and in sunlight are the more common prepositional phrases. What would be the difference between the case with and without definite article? Also, is there any justification on why under is not used?

Suppose that you want to say that you have put your wet shirt outside so that the sunlight dries it off. Now if you want to mention the sunlight in your sentence with a prepositional phrase, how would you word it? I have come up with the following sentences:

1. I have put my wet shirt outside to dry off under the sun.
2. I have put my wet shirt outside in the sunlight [ without the? ] to dry off.

It seems that, in the sun light and in sunlight are the more common prepositional phrases. What would be the difference between the case with and without definite article? Also, is there any justification on why under is not used?