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Rossiter-McLaughlin Observations of 55 Cnc e

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arxiv 1408.2007 v1 pith:F6WSAYCQ submitted 2014-08-09 astro-ph.EP

Rossiter-McLaughlin Observations of 55 Cnc e

Mercedes Lopez-Morales , Amaury H. M. J. Triaud , Florian Rodler , Xavier Dumusque , Lars A. Buchhave , A. Harutyunyan , Sergio Hoyer , Roi Alonso
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Michael Gillon Nathan A. Kaib David W. Latham Christophe Lovis Francesco Pepe Didier Queloz Sean N.Raymond Damien Segransan Ingo P. Waldmann Stephane Udry
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We present Rossiter-McLaughlin observations of the transiting super-Earth 55 Cnc e collected during six transit events between January 2012 and November 2013 with HARPS and HARPS-N. We detect no radial-velocity signal above 35 cm/s (3-sigma) and confine the stellar v sin i to 0.2 +/- 0.5 km/s. 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.

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