Line bisectors and radial velocity jitter from SARG spectra

Details Line bisectors and radial velocity jitter from SARG spectra Line bisectors and radial velocity jitter from SARG spectra

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006tafp.conf..144m&link_type=abstract

"Tenth Anniversary of 51 Peg-b: Status of and prospects for hot Jupiter studies. Colloquium held at Observatoire de Haute Proven

Computer Science

1

Scientific paper

We present an analysis of variations of bisectors of spectral lines for a few stars observed during the high precision radial velocity planet survey ongoing at SARG at TNG, and discuss the relation with differential radial velocities. The I_{2} cell lines employed in the radial velocities measurements were used to improve the wavelength calibration and then removed before bisector analysis. The line bisectors were then computed from average absorption profiles obtained by cross correlation of the stellar spectra with a mask made from suitable lines of a solar catalog. The run of bisector velocity span against radial velocity was studied searching for correlations between line asymmetries and radial velocity variations. A correlation was seen for HD 166435 due to stellar activity and for HD 8071B due to spectral contamination by the companion. No correlation was seen for 51 Peg and ρ CrB, stars hosting planets. We conclude that this technique may be useful to separate radial velocity variations due to center of mass motion from spurious signal in spectra acquired with the I_{2} cell.

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