A LOW STELLAR OBLIQUITY FOR WASP-47, A COMPACT MULTIPLANET SYSTEM WITH A HOT JUPITER AND AN ULTRA-SHORT PERIOD PLANET
Author(s)Sanchis-Ojeda, Roberto; Dai, Fei; Howard, Andrew W.; Isaacson, Howard; Marcy, Geoffrey W.; Petigura, Erik; Sinukoff, Evan; Weiss, Lauren; Albrecht, Simon; Hirano, Teruyuki; Rogers, Leslie; Winn, Joshua Nathan; ... Show more Show less
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We have detected the Rossiter–Mclaughlin effect during a transit of WASP-47b, the only known hot Jupiter with close planetary companions. By combining our spectroscopic observations with Kepler photometry, we show that the projected stellar obliquity is λ = 0° ± 24°. We can firmly exclude a retrograde orbit for WASP-47b, and rule out strongly misaligned prograde orbits. Low obliquities have also been found for most of the other compact multiplanet systems that have been investigated. The Kepler-56 system, with two close-in gas giants transiting their subgiant host star with an obliquity of at least 45◦, remains the only clear counterexample.
DepartmentKavli Institute for Astrophysics and Space Research; Massachusetts Institute of Technology. Department of Physics
The Astrophysical Journal. Letters
Sanchis-Ojeda, Roberto, Joshua N. Winn, Fei Dai, Andrew W. Howard, Howard Isaacson, Geoffrey W. Marcy, Erik Petigura, et al. “A LOW STELLAR OBLIQUITY FOR WASP-47, A COMPACT MULTIPLANET SYSTEM WITH A HOT JUPITER AND AN ULTRA-SHORT PERIOD PLANET.” The Astrophysical Journal 812, no. 1 (October 7, 2015): L11. © 2015 The American Astronomical Society
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