Today’s Oort cloud mass (m_ÖO, shades) as a function of the planetesimal disk-mass (m_dm) and the Sun’s escape time, t_esc. Here, m_dm is the leftover mass of the debris disk after the giant planets’ cores formed (here, the mass in planets’ cores is m_pc). Along the top axis we express m_dm in terms of the planet-formation efficiency, ϵ_pae ≡ m_dm/(m_dm + m_pc). The curves indicate the current mass of the Öpik-Oort cloud (in units of M_⊕) for a decay timescale, t_decay = 5000 Myr (white) and t_decay = 10 000 Myr (red). See also the color bar (to the right). Here, we calculated m_ÖO from the analytic model Eq:FRED presented in Sect:Fred (based on fig:OCGalacticOrbit).