Doppler monitoring of the WASP-47 multiplanet system

Fei Dai, Joshua N. Winn, Pamela Arriagada, R. Paul Butler, Jeffrey D. Crane, John Asher Johnson, Stephen A. Shectman, Johanna K. Teske, Ian B. Thompson, Andrew Vanderburg, Robert A. Wittenmyer

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


We present precise Doppler observations of WASP-47, a transiting planetary system featuring a hot Jupiter with both inner and outer planetary companions. This system has an unusual architecture and also provides a rare opportunity to measure planet masses in two different ways: the Doppler method, and the analysis of transit-timing variations (TTV). Based on the new Doppler data, obtained with the Planet Finder Spectrograph on the Magellan/Clay 6.5 m telescope, the mass of the hot Jupiter is This is consistent with the previous Doppler determination as well as the TTV determination. For the inner planet WASP-47e, the Doppler data lead to a mass of in agreement with the TTV-based upper limit of <22 M (95% confidence).

Original languageEnglish (US)
Article numberL9
JournalAstrophysical Journal Letters
Issue number1
StatePublished - Nov 1 2015
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • planetary systems
  • planets and satellites: composition
  • stars: individual (WASP-47)
  • techniques: radial velocities


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