Fourteen new companions from the keck and lick radial velocity survey including five brown dwarf candidates

Shannon G. Patel, Steven S. Vogt, Geoffrey W. Marcy, John A. Johnson, Debra A. Fischer, Jason T. Wright, R. Paul Butler

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

We present radial velocities for 14 stars on the California and Carnegie Planet Search target list that reveal new companions. One star, HD 167665, was fit with a definitive Keplerian orbit leading to a minimum mass for the companion of 50.3 MJup at a separation from its host of ∼5.5 AU. Incomplete or limited phase coverage for the remaining 13 stars prevents us from assigning to them unique orbital parameters. Instead, we fit their radial velocities with Keplerian orbits across a grid of fixed values for M sin i and period P, and use the resulting Χv2 surface to place constraints on M sin i, P, and semimajor axis a. This technique allowed us to restrict M sin i below the brown dwarfstellar mass boundary for an additional four companions (HD 150554, HD 8765, HD 72780, HD 74014). If the combined five companions are confirmed as brown dwarfs, these results would comprise the first major catch of such objects from our survey beyond ∼3 AU.

Original languageEnglish (US)
Pages (from-to)744-753
Number of pages10
JournalAstrophysical Journal
Volume665
Issue number1 PART 1
DOIs
StatePublished - Aug 10 2007

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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