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Like that:
sage: t = polygen(QQ, 't')
sage: x, y = polygens(FractionField(t.parent()), 'x,y')
sage: E = Curve(-y**2+x**4+x**3+t*x**2+(1+t)*x+(4+3*t))
sage: Jacobian(E)
Elliptic Curve defined by y^2 = x^3 + (-1/3*t^2-11*t-15)*x + (2/27*t^3-22/3*t^2-6*t+5) over Fraction Field of Univariate Polynomial Ring in t over Rational Field
