A LOW STELLAR OBLIQUITY for WASP-47, A COMPACT MULTIPLANET SYSTEM with A HOT JUPITER and AN ULTRA-SHORT PERIOD PLANET

Roberto Sanchis-Ojeda, Joshua N. Winn, Fei Dai, Andrew W. Howard, Howard Isaacson, Geoffrey W. Marcy, Erik Petigura, Evan Sinukoff, Lauren Weiss, Simon Albrecht, Teruyuki Hirano, Leslie Rogers

Research output: Contribution to journalArticle

19 Scopus citations

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.

Original languageEnglish (US)
Article numberL11
JournalAstrophysical Journal Letters
Volume812
Issue number1
DOIs
StatePublished - Oct 10 2015

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • planet-star interactions
  • planetary systems
  • planets and satellites: formation
  • stars: rotation

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    Sanchis-Ojeda, R., Winn, J. N., Dai, F., Howard, A. W., Isaacson, H., Marcy, G. W., Petigura, E., Sinukoff, E., Weiss, L., Albrecht, S., Hirano, T., & Rogers, L. (2015). A LOW STELLAR OBLIQUITY for WASP-47, A COMPACT MULTIPLANET SYSTEM with A HOT JUPITER and AN ULTRA-SHORT PERIOD PLANET. Astrophysical Journal Letters, 812(1), [L11]. https://doi.org/10.1088/2041-8205/812/1/L11