DOPPLER MONITORING OF THE WASP-47 MULTIPLANET SYSTEM

被引：28

作者：

Dai, Fei ^{[1
,2
]}

Winn, Joshua N. ^{[1
,2
]}

Arriagada, Pamela ^{[3
]}

Butler, R. Paul ^{[3
]}

Crane, Jeffrey D. ^{[4
]}

Johnson, John Asher ^{[5
]}

Shectman, Stephen A. ^{[4
]}

Teske, Johanna K. ^{[3
,4
]}

Thompson, Ian B. ^{[4
]}

Vanderburg, Andrew ^{[5
]}

Wittenmyer, Robert A. ^{[6
,7
]}

机构：

[1] MIT, Dept Phys, Cambridge, MA 02139 USA

[2] MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA

[3] Carnegie Inst Sci, Dept Terr Magnetism, Washington, DC 20015 USA

[4] Observ Carnegie Inst Washington, Pasadena, CA 91101 USA

[5] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[6] UNSW Australia, Sch Phys, Exoplanetary Sci UNSW, Sydney, NSW 2052, Australia

[7] UNSW Australia, Australian Ctr Astrobiol, Sydney, NSW 2052, Australia

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2015年 / 813卷 / 01期

基金：

美国国家科学基金会;

关键词：

planetary systems; planets and satellites: composition; stars: individual (WASP-47); techniques: radial velocities; 16 CYGNI B; TERRESTRIAL PLANETS; HIGH-ECCENTRICITY; SIZED EXOPLANET; HOT JUPITERS; MASS; TRANSIT; DENSITY; KEPLER; ORBITS;

D O I：

10.1088/2041-8205/813/1/L9

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 M-circle plus. 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 M-circle plus, in agreement with the TTV-based upper limit of < 22 M-circle plus (95% confidence). For the outer planet WASP-47d, the Doppler mass constraint of 10.4 +/- 8.4 M-circle plus is consistent with the TTV-based measurement of 15.2(-7.6)(+6.7) M-circle plus.

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