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

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Date

2015-02

Authors

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

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Abstract

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.

Department

McDonald Observatory

Description

Keywords

planetary systems, stars: individual (hd 121056), techniques: radial, velocities, anglo-australian planet, radial-velocity measurements, giant planet, stellar evolution, jupiter analogs, spaced data, bd+20 2457, k-giant, stars, subgiants, astronomy & astrophysics

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Citation

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.

URI

http://hdl.handle.net/2152/34751

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UT Faculty/Researcher Works