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 1 David W. Latham Christophe Lovis Francesco Pepe Didier Queloz 2 Sean N. Raymond 3 Damien Segransan 2 Ingo P. Waldmann Stephane Udry 2
3 ECLIPSE 2014
L3AB - Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux, OASU - Observatoire aquitain des sciences de l'univers, LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac], Université Sciences et Technologies - Bordeaux 1
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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Submitted on : Tuesday, September 9, 2014 - 11:33:37 AM
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Mercedes Lopez-Morales, Amaury H. M. J. Triaud, Florian Rodler, Xavier Dumusque, Lars A. Buchhave, et al.. Rossiter-McLaughlin Observations of 55 Cnc e. Astrophysical Journal Letters, 2014, 792 (2), L31. ⟨10.1088/2041-8205/792/2/L31⟩. ⟨hal-01062137⟩



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