Doppler Monitoring of the WASP-47 Multiplanet System

Abstract

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 6.5m telescope, the mass of the hot Jupiter is $370\pm 29M_{\oplus }$. 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 $12.2\pm 3.7M_{\oplus }$, in agreement with the TTV-based upper limit of $<$22~$M_{\oplus }$ ($95\%$ confidence). For the outer planet WASP-47d, the Doppler mass constraint of $10.4\pm 8.4M_{\oplus }$ is consistent with the TTV-based measurement of $15.2_{-7.6}^{+6.7}{M}_{\oplus }$.

6 pages, 3 figures, accepted for ApJL

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