Can planetary rings explain the extremely low density of HIP 41378 𝑓? B. Akinsanmi, N. C. Santos, J. P. Faria, M. Oshagh, S. C. C. Barros, A. Santerne and S. Charnoz A&A, 635 (2020) L8 Published online: 06 March 2020 DOI: 10.1051/0004-6361/202037618