The Pan-Pacific Planet Search. II. Confirmation of a two-planet system around HD 121056
Robert A. Wittenmyer, Liang Wang, Fan Liu, Jonathan Horner, Michael, Endl, John Asher Johnson, C.G. Tinney, B.D. Carter

TL;DR
This paper confirms a two-planet system around the evolved star HD 121056 using precise radial velocity measurements, highlighting its significance as the most-evolved star known to host multiple planets with diverse orbital periods.
Contribution
First confirmation of a multi-planet system around an evolved giant star, demonstrating the presence of both short- and long-period planets around HD 121056.
Findings
Inner planet has a period of 89.1 days and mass of 1.35 Mjup.
Outer planet has a mass of 3.9 Mjup and orbits at 2.96 AU.
HD 121056 is the most-evolved star with a confirmed multiple-planet system.
Abstract
Precise radial velocities from the Anglo-Australian Telescope confirm the presence of a rare short-period planet around the K0 giant HD 121056. An independent two-planet solution using the AAT data shows that the inner planet has P=89.1+/-0.1 days, and m sin i=1.35+/-0.17 Mjup. These data also confirm the planetary nature of the outer companion, with m sin i=3.9+/-0.6 Mjup and a=2.96+/-0.16 AU. HD 121056 is the most-evolved star to host a confirmed multiple-planet system, and is a valuable example of a giant star hosting both a short-period and a long-period planet.
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