Radial-velocity jitter of stars as a function of observational timescale and stellar age Stefan S. Brems, Martin Kürster, Trifon Trifonov, Sabine Reffert and Andreas Quirrenbach A&A, 632 (2019) A37 Published online: 25 November 2019 DOI: 10.1051/0004-6361/201935520