Rossiter-McLaughlin observations of 55 Cnc e

M. López-Morales, A. H. M. J. Triaud, F. Rodler, Xavier Dumusque, L. A. Buchhave, A. Harutyunyan, S. Hoyer, R. Alonso, M. Gillon, N. A. Kaib, D. W. Latham, Christophe Lovis, F. Pepe, Didier Queloz, S. N. Raymond, D. Ségransan, I. P. Waldmann, S. Udry

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We present Rossiter-McLaughlin observations of the transiting super-Earth 55 Cnc e collected during six transit events between 2012 January and 2013 November with HARPS and HARPS-N. We detect no radial velocity signal above 35 cm s-1 (3σ) and confine the stellar v sin ito 0.2 ± 0.5 km s-1. The star appears to be a very slow rotator, producing a very low amplitude Rossiter-McLaughlin effect. Given such a low amplitude, the Rossiter-McLaughlin effect of 55 Cnc e is undetected in our data, and any spin-orbit angle of the system remains possible. We also performed Doppler tomography and reach a similar conclusion. Our results offer a glimpse of the capacity of future instrumentation to study low amplitude Rossiter-McLaughlin effects produced by super-Earths.
Original languageEnglish
Article numberL31
Number of pages6
JournalAstrophysical Journal Letters
Issue number2
Early online date25 Aug 2014
Publication statusPublished - 10 Sept 2014


  • planets and satellites: formation
  • planets and satellites: individual (55 Cancri e)
  • stars: individual (55 Cancri)
  • techniques: radial velocities
  • techniques: spectroscopic


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