The Pan-Pacific Planet Search. II. Confirmation Of A Two-Planet System Around Hd 121056




Wittenmyer, Robert A.
Wang, Lifan
Liu, Fan
Horner, Jonathan
Endl, Michael
Johnson, John A.
Tinney, C. G.
Carter, B. D.

Journal Title

Journal ISSN

Volume Title



Precise radial velocities from the Anglo-Australian Telescope (AAT) 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 M-Jup. These data also confirm the planetary nature of the outer companion, with m sin i = 3.9 +/- 0.6 M-Jup 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.


LCSH Subject Headings


Wittenmyer, Robert A., Liang Wang, Fan Liu, Jonathan Horner, Michael Endl, John Asher Johnson, C. G. Tinney, and B. D. Carter. "The Pan-Pacific Planet Search. II. Confirmation of a two-planet system around HD 121056."ᅠThe Astrophysical Journal, Vol.ᅠ800, No. 1 (Feb., 2015): 74.