Analytic Description of the Rossiter-McLaughlin Effect for Transiting Exoplanets: Cross-Correlation Method and Comparison with Simulated Data
Author(s)
Hirano, Teruyuki
Suto, Yasushi
Taruya, Atsushi
Narita, Norio
Sato, Bun'ei
Johnson, John Asher
Winn
Date Issued
January 2010
Journal
Astrophysical Journal
Publisher
IOP Publishing
Citation
Teruyuki Hirano et al. "Analytic Description of the Rossiter-McLaughlin Effect for Transiting Exoplanets: Cross-Correlation Method and Comparison with Simulated Data" The Astrophysical Journal 709.1 (2010): 458.
Version
Author's final manuscript
Abstract
We obtain analytical expressions for the velocity anomaly due to the Rossiter-
McLaughlin effect, for the case when the anomalous radial velocity is obtained by
cross-correlation with a stellar template spectrum. In the limit of vanishing width
of the stellar absorption lines, our result reduces to the formula derived by Ohta
et al. (2005), which is based on the first moment of distorted stellar lines. Our
new formula contains a term dependent on the stellar linewidth, which becomes
important when rotational line broadening is appreciable. We generate mock
transit spectra for four existing exoplanetary systems (HD17156, TrES-2, TrES-
4, and HD209458) following the procedure of Winn et al. (2005), and find that
the new formula is in better agreement with the velocity anomaly extracted from
the mock data. Thus, our result provides a more reliable analytical description
of the velocity anomaly due to the Rossiter-McLaughlin effect, and explains the
previously observed dependence of the velocity anomaly on the stellar rotation
velocity.
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike 3.0
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1088/0004-637x/709/1/458
