Transit probabilities around hypervelocity and runaway stars

G. Fragione*, I. Ginsburg

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


In the blooming field of exoplanetary science, NASA's Kepler Space Telescope has revolutionized our understanding of exoplanets. Kepler's very precise and long-duration photometry is ideal for detecting planetary transits around Sun-like stars. The forthcoming Transiting Exoplanet Survey Satellite (TESS) is expected to continue Kepler's legacy. Along with transits, the Doppler technique remains an invaluable tool for discovering planets. The next generation of spectrographs, such as G-CLEF, promise precision radial velocity measurements. In this paper, we explore the possibility of detecting planets around hypervelocity and runaway stars, which should host a very compact system as consequence of their turbulent origin. We find that the probability of a multiplanetary transit is 10−3 ≾ P ≾ 10−1. We therefore need to observe ∼10-1000 high-velocity stars to spot a transit. However, even if transits are rare around runaway and hypervelocity stars, the chances of detecting such planets using radial velocity surveys is high. We predict that the European Gaia satellite, along with TESS and the new-generation spectrographs G-CLEF and ESPRESSO, will spot planetary systems orbiting high-velocity stars.

Original languageEnglish (US)
Pages (from-to)1805-1813
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
StatePublished - Apr 1 2017
Externally publishedYes


  • Planets and satellites: detection
  • Planets and satellites: general
  • Stars: planetary systems

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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