Erratum for: A&A 602, A27 (2017), DOI: 10.1051/0004-6361/201629858

Some errors appeared in the published version.

The corrected Eq. (10) is: ${\mathit{R}}_{\mathit{a}}\mathrm{=}{\mathit{R}}_{\mathit{b}}\left(\sqrt{\mathrm{\left(}\mathrm{\right(}{\mathit{a}}_{\mathrm{rings}}\mathrm{\Delta }{\mathit{V}}_{\mathit{b}}^{\mathrm{2}}\mathrm{)}\mathit{/}\mathrm{(}\mathit{G}{\mathit{M}}_{\mathrm{ch}}\mathrm{\left)}\mathrm{\right)}}\mathrm{-}\mathrm{1}\right)\mathit{.}$(1)In addition, the affiliation of J. L. Ortiz has been corrected, and the Acknowledgements section should read:

Acknowledgments

R.D. acknowledges the support of MINECO for his Ramón y Cajal Contract. Funding from Spanish funding form grant AYA-2014-56637-C2-1-P is acknowledged, as is the Proyecto de Excelencia de la Junta de Andalucía, J. A. 2012-FQM1776. FEDER funds are also acknowledged. M.D.M. acknowledges the support of Min CyT ANPCyt PicT 1144/2013 and the support of the travel grant from CONICET and CSiC. The research leading to these results has received funding from the European Union’s Horizon 2020 Research and Innovation Programme, under Grant Agreement No. 687378.

© ESO, 2017