EN
Following the line of attack of La Bretèche, Browning and Peyre, we prove Manin's conjecture in its strong form conjectured by Peyre for a family of Châtelet surfaces which are defined as minimal proper smooth models of affine surfaces of the form
Y² - aZ² = F(X,1),
where a = -1, F ∈ ℤ[x₁,x₂] is a polynomial of degree 4 whose factorisation into irreducibles contains two non-proportional linear factors and a quadratic factor which is irreducible over ℚ [i]. This result deals with the last remaining case of Manin's conjecture for Châtelet surfaces with a = -1 and essentially settles Manin's conjecture for Châtelet surfaces with a < 0.