  We use archival HARPS spectra to detect three planets orbiting the M3 dwarf
Wolf1061 (GJ 628). We detect a 1.36 Mearth minimum-mass planet with an orbital
period P = 4.888d (Wolf1061b), a 4.25 Mearth minimum-mass planet with orbital
period P = 17.867d (Wolf1061c), and a likely 5.21 Mearth minimum-mass planet
with orbital period P = 67.274d (Wolf1061d). All of the planets are of
sufficiently low mass that they may be rocky in nature. The 17.867d planet
falls within the habitable zone for Wolf 1061 and the 67.274d planet falls just
outside the outer boundary of the habitable zone. There are no signs of
activity observed in the bisector spans, cross-correlation
full-width-half-maxima, Calcium H & K indices, NaD indices, or H-alpha indices
near the planetary periods. We use custom methods to generate a
cross-correlation template tailored to the star. The resulting velocities do
not suffer the strong annual variation observed in the HARPS DRS velocities.
This differential technique should deliver better exploitation of the archival
HARPS data for the detection of planets at extremely low amplitudes.
