THE ANGLO-AUSTRALIAN PLANET SEARCH. XXII. TWO NEW MULTI-PLANET SYSTEMS

Journal Article · Tue Jul 10 00:00:00 EDT 2012 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/753/2/169· OSTI ID:22039355

Wittenmyer, Robert A; Horner, J; Salter, G S; Tinney, C G; Bailey, J ^[1]; Tuomi, Mikko; Zhang, Z ^[2]; Butler, R P ^[3]; Jones, H R. A. ^[4]; O'Toole, S J ^[5]; Carter, B D ^[6]; Jenkins, J S ^[7]; Vogt, S S

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1. Department of Astrophysics, School of Physics, University of New South Wales, Sydney, NSW 2052 (Australia)
2. Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, College Lane, Hatfield AL10 9AB (United Kingdom)
3. Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Road, NW, Washington, DC 20015-1305 (United States)
4. Centre for Astrophysics Research, University of Hertfordshire, College Lane, Hatfield, AL10 9AB (United Kingdom)
5. Australian Astronomical Observatory, P.O. Box 296, Epping, NSW 1710 (Australia)
6. Faculty of Sciences, University of Southern Queensland, Toowoomba, Queensland 4350 (Australia)
7. Departamento de Astronomia, Universidad de Chile, Camino El Observatorio 1515, Las Condes, Santiago (Chile)

We report the detection of two new planets from the Anglo-Australian Planet Search. These planets orbit two stars each previously known to host one planet. The new planet orbiting HD 142 has a period of 6005 {+-} 427 days, and a minimum mass of 5.3 M{sub Jup}. HD 142c is thus a new Jupiter analog: a gas-giant planet with a long period and low eccentricity (e = 0.21 {+-} 0.07). The second planet in the HD 159868 system has a period of 352.3 {+-} 1.3 days and m sin i = 0.73 {+-} 0.05 M{sub Jup}. In both of these systems, including the additional planets in the fitting process significantly reduced the eccentricity of the original planet. These systems are thus examples of how multiple-planet systems can masquerade as moderately eccentric single-planet systems.

• OSTI ID: 22039355
• Journal Information: Astrophysical Journal, Vol. 753, Issue 2; 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
ASTRONOMY
ASTROPHYSICS
DETECTION
MASS
ORBITS
PLANETS
RADIAL VELOCITY
STARS