Thermal evolution of rocky exoplanets with a graphite outer shell Kaustubh Hakim, Arie van den Berg, Allona Vazan, Dennis Höning, Wim van Westrenen and Carsten Dominik A&A, 630 (2019) A152 Published online: 10 October 2019 DOI: 10.1051/0004-6361/201935714