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Trojan pairs in the HD 128311 and HD 82943 planetary systems?

Goździewski, Krzysztof and Konacki, Maciej (2006) Trojan pairs in the HD 128311 and HD 82943 planetary systems? Astrophysical Journal, 647 (1). pp. 573-586. ISSN 0004-637X.

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Two nearby stars, HD 128311 and HD 82943, are believed to host pairs of Jupiter-like planets involved in a strong first-order 2:1 mean motion resonance (MMR). In this work, we reanalyze available radial velocity (RV) measurements and demonstrate that it is also possible to explain the observed RV variations of the parent stars as being induced by a pair of Trojan planets (i.e., in a 1:1 MMR). We show that these Trojan configurations reside in extended zones of stability in which such systems can easily survive in spite of the large masses of the planets, large eccentricities, and nonzero mutual inclinations of their orbits. We also show that HD 82943 could harbor a previously unknown third planet of ~0.5MJ in ~2 AU orbit.

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Additional Information:© 2006 The American Astronomical Society. Received 2005 October 5; accepted 2006 April 21. We appreciate discussions with Sylvio Ferraz-Mello and his help with obtaining the RV data of the HD 82943 system. We thank Man Hoi Lee for a detailed review and critical remarks that improved the manuscript and for providing the full set of RV measurements of HD 82943. This work is supported by the Polish Ministry of Education and Science, grant 1P03D 021 29. M. K. is also supported by NASA through grant NNG04GM62G.
Subject Keywords:celestial mechanics—methods: n-body simulations—methods: numerical—planetary systems—stars: individual (HD 82943, HD 128311)—stellar dynamics
Issue or Number:1
Record Number:CaltechAUTHORS:GOZapj06b
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:7259
Deposited By: Lindsay Cleary
Deposited On:24 Jan 2007
Last Modified:02 Oct 2019 23:40

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