DOPPLER MONITORING OF THE WASP-47 MULTIPLANET SYSTEM

• Main Authors: Dai, Fei (Contributor), Arriagada, Pamela (Author), Butler, R. Paul (Author), Crane, Jeffrey D. (Author), Johnson, John Asher (Author), Shectman, Stephen A. (Author), Teske, Johanna K. (Author), Thompson, Ian B. (Author), Vanderburg, Andrew (Author), Wittenmyer, Robert A. (Author), Winn, Joshua Nathan (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor), MIT Kavli Institute for Astrophysics and Space Research (Contributor)
• Format: Article
• Language: English
• Published: IOP Publishing, 2016-01-14T00:06:25Z.
• Subjects: Article
• Online Access: Get fulltext

 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 370 ± 29[subscript ⊕]. 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 ± 3.7[subscript ⊕], in agreement with the TTV-based upper limit of <22 M[subscript ⊕] (95% confidence). For the outer planet WASP-47d, the Doppler mass constraint of 10.4 ± 8.4[subscript ⊕] is consistent with the TTV-based measurement of $15.2[+6.7 over -7.6] M[subscript ⊕].