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Analytic Description of the Rossiter–Mclaughlin Effect for Transiting Exoplanets: Cross-Correlation Method and Comparison with Simulated Data

Hirano, Teruyuki and Suto, Yasushi and Taruya, Atsushi and Narita, Norio and Sato, Bun'ei and Johnson, John Asher and Winn, Joshua N. (2010) Analytic Description of the Rossiter–Mclaughlin Effect for Transiting Exoplanets: Cross-Correlation Method and Comparison with Simulated Data. Astrophysical Journal, 709 (1). pp. 458-469. ISSN 0004-637X. https://resolver.caltech.edu/CaltechAUTHORS:20100129-091514059

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Abstract

We obtain analytical expressions for the velocity anomaly due to the Rossiter-McLaughlin (RM) 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., which is based on the first moment of distorted stellar lines. Our new formula contains a term dependent on the stellar line width, which becomes important when rotational line broadening is appreciable. We generate mock transit spectra for four existing exoplanetary systems (HD 17156, TrES-2, TrES-4, and HD 209458) following the procedure of Winn et al., 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 RM effect, and explains the previously observed dependence of the velocity anomaly on the stellar rotation velocity.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1088/0004-637X/709/1/458 DOIArticle
http://www.iop.org/EJ/abstract/0004-637X/709/1/458/PublisherArticle
ORCID:
AuthorORCID
Hirano, Teruyuki0000-0003-3618-7535
Johnson, John Asher0000-0001-9808-7172
Winn, Joshua N.0000-0002-4265-047X
Additional Information:© 2010 American Astronomical Society. Received 2009 October 3; accepted 2009 December 2; published 2010 January 4. We thank Wako Aoki for useful advice on the spectral line profiles. The radial velocity analysis in our simulation was carried out on the computer system at the Astronomy Data Center of the National Astronomical Observatory of Japan. N.N. is supported by a Japan Society for Promotion of Science (JSPS) Fellowship for Research (PD: 20-8141). Y.S. gratefully acknowledges the support from the Global Scholars Program of Princeton University. This work is also supported by JSPS Coreto-Core Program “International Research Network for Dark Energy.” J.N.W. gratefully acknowledges the support of the NASA Origins program through award NNX09AD36G.
Funders:
Funding AgencyGrant Number
Japan Society for Promotion of Science (JSPS)PD: 20- 8141
Princeton UniversityUNSPECIFIED
NASANNX09AD36G
Subject Keywords:planetary systems; planets and satellites: formation; stars: rotation; techniques: radial velocities; techniques: spectroscopic
Issue or Number:1
Record Number:CaltechAUTHORS:20100129-091514059
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20100129-091514059
Official Citation:Analytic Description of the Rossiter–Mclaughlin Effect for Transiting Exoplanets: Cross-Correlation Method and Comparison with Simulated Data Teruyuki Hirano, Yasushi Suto, Atsushi Taruya, Norio Narita, Bun'ei Sato, John Asher Johnson, and Joshua N. Winn 2010 ApJ 709 458-469 doi: 10.1088/0004-637X/709/1/458
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:17348
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:01 Feb 2010 03:03
Last Modified:09 Mar 2020 13:18

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