ROSSITER-MCLAUGHLIN OBSERVATIONS OF 55 Cnc e

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Lopez-Morales, Mercedes; Triaud, Amaury; Rodler, Florian; Dumusque, Xavier; Buchhave, Lars A.; ... Show more
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Abstract
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 i [subscript *] to 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.
Date issued
2014-08
URI
http://hdl.handle.net/1721.1/93251
Department
Massachusetts Institute of Technology. Department of Physics; MIT Kavli Institute for Astrophysics and Space Research
Journal
Astrophysical Journal
Publisher
Institute of Physics/American Astronomical Society
Citation
López-Morales, Mercedes, Amaury H. M. J. Triaud, Florian Rodler, Xavier Dumusque, Lars A. Buchhave, Avet Harutyunyan, Sergio Hoyer, et al. “ROSSITER-MCLAUGHLIN OBSERVATIONS OF 55 Cnc e.” The Astrophysical Journal 792, no. 2 (August 25, 2014): L31. © 2014 American Astronomical Society.
Version: Final published version
ISSN
2041-8213
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