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

TL;DR
This study uses Doppler and transit-timing variation methods to precisely measure the masses of planets in the unusual WASP-47 system, confirming the system's planetary architecture and mass estimates.
Contribution
First combined Doppler and TTV analysis of the WASP-47 system, providing consistent mass measurements for all planets and demonstrating the system's unique architecture.
Findings
Doppler data confirms hot Jupiter mass at 370 ± 29 Earth masses.
Inner planet WASP-47e has a mass of 12.2 ± 3.7 Earth masses.
Outer planet WASP-47d has a mass of 10.4 ± 8.4 Earth masses.
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 . 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~ ( confidence). For the outer planet WASP-47d, the Doppler mass constraint of is consistent with…
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