Why an intrinsic magnetic field does not protect a planet against atmospheric escape Herbert Gunell, Romain Maggiolo, Hans Nilsson, Gabriella Stenberg Wieser, Rikard Slapak, Jesper Lindkvist, Maria Hamrin and Johan De Keyser A&A, 614 (2018) L3 Published online: 21 June 2018 DOI: 10.1051/0004-6361/201832934