Ten new and updated multiplanet systems and a survey of exoplanetary systems

J. T. Wright, S. Upadhyay, G. W. Marcy, D. A. Fischer, Eric B. Ford, John Asher Johnson

Research output: Contribution to journalArticle

219 Citations (Scopus)

Abstract

We present the latest velocities for ten multiplanet systems, including a re-Analysis of archival Keck and Lick data, resulting in improved velocities that supersede our previously published measurements. We derive updated orbital fits for 10 Lick and Keck systems, including two systems (HD 11964, HD 183263) for which we provide confirmation of second planets only tentatively identified elsewhere, and two others (HD 187123 and HD 217107) for which we provide a major revision of the outer planet's orbit. We compile orbital elements from the literature to generate a catalog of the 28 published multiple-planet systems around stars within 200 pc. From this catalog we find several intriguing patterns emerging: (1) including those systems with long-Term radial velocity trends, at least 28% of known planetary systems appear to contain multiple planets; (2) planets in multipleplanet systems have somewhat smaller eccentricities than single planets; and (3) the distribution of orbital distances of planets in multiplanet systems and single planets are inconsistent: single-planet systems show a pileup at P ∼ 3 days and a jump near 1 AU, while multiplanet systems show a more uniform distribution in log-period. In addition, among all planetary systems we find the following. (1)Theremay be an emerging, positive correlation between stellar mass and giant-planet semimajor axis. (2) ExoplanetswithMsin i>1MJup more massive than Jupiter have eccentricities broadly distributed across 0 < e < 0.5, while lower mass exoplanets exhibit a distribution peaked near e = 0.

Original languageEnglish (US)
Pages (from-to)1084-1099
Number of pages16
JournalAstrophysical Journal
Volume693
Issue number2
DOIs
StatePublished - Mar 10 2009

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planets
planet
planetary systems
eccentricity
catalogs
emerging
orbitals
orbital elements
extrasolar planets
stellar mass
Jupiter (planet)
Jupiter
radial velocity
orbits
trends
stars
distribution

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Wright, J. T. ; Upadhyay, S. ; Marcy, G. W. ; Fischer, D. A. ; Ford, Eric B. ; Johnson, John Asher. / Ten new and updated multiplanet systems and a survey of exoplanetary systems. In: Astrophysical Journal. 2009 ; Vol. 693, No. 2. pp. 1084-1099.
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Ten new and updated multiplanet systems and a survey of exoplanetary systems. / Wright, J. T.; Upadhyay, S.; Marcy, G. W.; Fischer, D. A.; Ford, Eric B.; Johnson, John Asher.

In: Astrophysical Journal, Vol. 693, No. 2, 10.03.2009, p. 1084-1099.

Research output: Contribution to journalArticle

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