THE PAN-PACIFIC PLANET SEARCH. II. CONFIRMATION OF A TWO-PLANET SYSTEM AROUND HD 121056

Journal Article · Tue Feb 10 00:00:00 EST 2015 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/800/1/74· OSTI ID:22364198

Wittenmyer, Robert A.; Tinney, C. G. ^[1]; Wang, Liang ^[2]; Liu, Fan ^[3]; Horner, Jonathan ^[4]; Endl, Michael ^[5]; Johnson, John Asher ^[6]

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1. School of Physics, University of New South Wales, Sydney, NSW 2052 (Australia)
2. Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, A20 Datun Road, Chaoyang District, Beijing 100012 (China)
3. Research School of Astronomy and Astrophysics, Australian National University, Cotter Road, Weston Creek, ACT 2611 (Australia)
4. Australian Centre for Astrobiology, University of New South Wales, Sydney, NSW 2052 (Australia)
5. McDonald Observatory, University of Texas at Austin, 1 University Station C1400, Austin, TX 78712 (United States)
6. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138 (United States)

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{sub Jup}. These data also confirm the planetary nature of the outer companion, with m sin i = 3.9 ± 0.6 M{sub 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.

• OSTI ID: 22364198
• Journal Information: Astrophysical Journal, Vol. 800, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
GIANT STARS
MATHEMATICAL SOLUTIONS
PLANETS
RADIAL VELOCITY
TELESCOPES