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arXiv · 1408.2007

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·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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Abstract

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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Mercedes Lopez-Morales, Amaury H. M. J. Triaud, Florian Rodler, Xavier Dumusque, Lars A. Buchhave, A. Harutyunyan, Sergio Hoyer, Roi Alonso, Michael Gillon, Nathan A. Kaib, David W. Latham, Christophe Lovis, Francesco Pepe, Didier Queloz, Sean N. Raymond, Damien Segransan, Ingo P. Waldmann, Stephane Udry. 2014-08-09. Rossiter-McLaughlin Observations of 55 Cnc e. https://doi.org/10.1088/2041-8205/792/2/l31

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