A LOW STELLAR OBLIQUITY FOR WASP-47, A COMPACT MULTIPLANET SYSTEM WITH A HOT JUPITER AND AN ULTRA-SHORT PERIOD PLANET
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Sanchis-Ojeda-2015-A LOW STELLAR OBLIQU.pdf
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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
Date Issued
October 2015
Journal
The Astrophysical Journal. Letters
Publisher
IOP Publishing
Citation
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
Version
Final published version
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1088/2041-8205/812/1/l11
