Ethics are often based on logic and emotions, but was there any effort to remove the emotional part and systematize ethics? What are some of the systems derived from such efforts?
I'm not sure that objectivity has degrees but won't argue that point. One ethical system that is intellectualist in the sense you are looking for is Plato's ethical theory in the Republic. Here morality is purely cognitive and depends on the intellectual apprehension of the Forms, which are transcendent, eternal, unchanging entities. This apprehension is possible only for those who have undergone a long process of education which includes the training and control of the emotions. But emotions are no part of morality; training and control of them is merely necessary in order to prevent their distracting us from the intellectual route march that ends in our apprehending the Forms.
Plato's ethical theory is full of problems. But such as it is, it appears to satisfy your 'removal of the emotional part'. Plato's theory is also necessarily systematic because the Forms stand in organised relations to the ultimate reality, the Form of the Good. (Not that 'Good' precisely corresponds to Plato's Greek - (auto to agathon - but if we immerse ourselves in this issue here we will never resurface.)