Observational constraints on trojans of transiting extrasolar planets

Eric B. Ford, B. Scott Gaudi

Research output: Contribution to journalArticlepeer-review

73 Scopus citations


Theoretical studies predict that Trojans are likely a frequent by-product of planet formation and evolution. We present a novel method of detecting Trojan companions to transiting extrasolar planets that involves comparing the midtime of eclipse with the time of the stellar reflex velocity null. We demonstrate that this method offers the potential to detect terrestrial-mass Trojans using existing ground-based observatories. This method rules out Trojan companions to HD 209458h and HD 149026b more massive than ≃ 13 and ≃ 25 M at a 99.9% confidence level. Such a Trojan would be dynamically stable, would not yet have been detected by photometric or spectroscopic monitoring, and would be unrecognizable from radial velocity observations alone. We outline the future prospects for this method and show that the detection of a "Hot Trojan" of any mass would place a significant constraint on theories of orbital migration.

Original languageEnglish (US)
Pages (from-to)L137-L140
JournalAstrophysical Journal
Issue number2 II
StatePublished - Dec 1 2006

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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