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J/ApJ/792/L31  HARPS and HARPS-N 55 Cnc radial velocities (Lopez-Morales+, 2014)

Rossiter-McLaughlin observations of 55 Cnc e. Lopez-Morales M., Triaud A.H.M.J., Rodler F., Dumusque X., Buchhave L.A., Harutyunyan A., Hoyer S., Alonso R., Gillon M., Kaib N.A., Latham D.W., Lovis C., Pepe F., Queloz D., Raymond S.N., Segransan D., Waldmann I.P., Udry S. <Astrophys. J., 792, L31 (2014)> =2014ApJ...792L..31L (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Planets ; Radial velocities Keywords: planets and satellites: formation - planets and satellites: individual: 55 Cancri e - stars: individual: 55 Cnc - techniques: radial velocities - techniques: spectroscopic 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 (3σ) and confine the stellar vsini* 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. Description: Shortly after the detection of 55 Cnc e's transit was announced, we requested four spectroscopic time series on HARPS (Prog. ID 288.C-5010; PI: Triaud) as Director Discretionary Time. HARPS is installed on the 3.6 m telescope at the European Southern Observatory on La Silla, Chile (Mayor et al. 2003Msngr.114...20M). The position of 55 Cnc in the sky-RA(J2000)=08:52:35.81, DE(J2000)=+28:10:50.95-is low as seen from La Silla. The target remains at a zenith distance of z<2 for only ∼2.5 hr per night, with a transit duration of about 1.5 hr having to fit within this tight window. This constraint on the airmass, essential to obtain precise radial velocities (RVs), is set by the instrumental atmospheric dispersion corrector. We used the ephemeris by Gillon et al. (2012, J/A+A/539/A28), then at an advanced stage of preparation, to schedule our observations. In total, we gathered 179 spectra on the nights starting on 2012 January 27, 2012 February 13, 2012 February 27, and 2012 March 15 UT. Objects: ---------------------------------------------------------- RA (ICRS) DE Designation(s) ---------------------------------------------------------- 08 52 35.81 +28 19 51.0 55 Cnc e = NAME Janssen 08 52 35.81 +28 19 51.0 55 Cnc = GC 12244 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 81 293 Radial velocities of all spectra of 55 Cnc observed with HARPS and HARPS-N
See also: J/A+A/533/A114 : Transit of super-Earth 55 Cnc e (Demory+, 2011) J/A+A/539/A28 : New transit photometry for super-Earth 55 Cnc e (Gillon+, 2012) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 12 F12.6 d BJD Barycentric Julian Date (BJD-2400000) 14- 21 F8.5 km/s RV Radial Velocity 23- 29 F7.5 km/s e_RV Error in RV 31- 37 F7.5 km/s FWHM Full Width at Half Maximum 39- 46 F8.5 km/s BisSpan Bisector slope span 48- 53 F6.2 --- S/N Signal-to-Noise ratio at 6240Å 55- 58 F4.2 --- Airmass Airmass 60- 65 F6.2 arcsec Seeing ? Seeing from La Silla seeing monitor 67- 71 F5.1 s ExpTime Exposure time 73- 81 F9.6 km/s RVcorr Corrected Radial Velocity (1)
Note (1): With the five planet Doppler displacement removed.
History: From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 05-Apr-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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