A fresh look at the seismic spectrum of HD49933: Analysis of 180 days of CoRoT photometry

Othman Benomar, F. Baudin, T. L. Campante, W. J. Chaplin, R. A. García, P. Gaulme, T. Toutain, G. A. Verner, T. Appourchaux, J. Ballot, C. Barban, Y. Elsworth, S. Mathur, B. Mosser, C. Régulo, I. W. Roxburgh, M. Auvergne, A. Baglin, C. Catala, E. MichelR. Samadi

Research output: Contribution to journalArticle

Abstract

Context. Solar-like oscillations have now been observed in several stars, thanks to ground-based spectroscopic observations and space-borne photometry. CoRoT, which has been in orbit since December 2006, has observed the star HD49933 twice. The oscillation spectrum of this star has proven difficult to interpret. Aims. Thanks to a new timeseries provided by CoRoT, we aim to provide a robust description of the oscillations in HD49933, i.e., to identify the degrees of the observed modes, and to measure mode frequencies, widths, amplitudes and the average rotational splitting.Methods. Several methods were used to model the Fourier spectrum: Maximum Likelihood Estimators and Bayesian analysis using Markov Chain Monte-Carlo techniques.Results. The different methods yield consistent result, and allow us to make a robust identification of the modes and to extract precise mode parameters. Only the rotational splitting remains difficult to estimate precisely, but is clearly relatively large (several μHz in size).

Original languageEnglish (US)
JournalAstronomy and Astrophysics
Volume507
Issue number1
DOIs
StatePublished - Nov 3 2009

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photometry
oscillation
stars
maximum likelihood analysis
Bayesian analysis
Markov chain
solar oscillations
oscillations
Markov chains
estimators
orbits
analysis
method
estimates
parameter

Keywords

  • Stars: oscillations

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Benomar, O., Baudin, F., Campante, T. L., Chaplin, W. J., García, R. A., Gaulme, P., ... Samadi, R. (2009). A fresh look at the seismic spectrum of HD49933: Analysis of 180 days of CoRoT photometry. Astronomy and Astrophysics, 507(1). https://doi.org/10.1051/0004-6361/200913111

A fresh look at the seismic spectrum of HD49933 : Analysis of 180 days of CoRoT photometry. / Benomar, Othman; Baudin, F.; Campante, T. L.; Chaplin, W. J.; García, R. A.; Gaulme, P.; Toutain, T.; Verner, G. A.; Appourchaux, T.; Ballot, J.; Barban, C.; Elsworth, Y.; Mathur, S.; Mosser, B.; Régulo, C.; Roxburgh, I. W.; Auvergne, M.; Baglin, A.; Catala, C.; Michel, E.; Samadi, R.

In: Astronomy and Astrophysics, Vol. 507, No. 1, 03.11.2009.

Research output: Contribution to journalArticle

Benomar, O, Baudin, F, Campante, TL, Chaplin, WJ, García, RA, Gaulme, P, Toutain, T, Verner, GA, Appourchaux, T, Ballot, J, Barban, C, Elsworth, Y, Mathur, S, Mosser, B, Régulo, C, Roxburgh, IW, Auvergne, M, Baglin, A, Catala, C, Michel, E & Samadi, R 2009, 'A fresh look at the seismic spectrum of HD49933: Analysis of 180 days of CoRoT photometry', Astronomy and Astrophysics, vol. 507, no. 1. https://doi.org/10.1051/0004-6361/200913111
Benomar, Othman ; Baudin, F. ; Campante, T. L. ; Chaplin, W. J. ; García, R. A. ; Gaulme, P. ; Toutain, T. ; Verner, G. A. ; Appourchaux, T. ; Ballot, J. ; Barban, C. ; Elsworth, Y. ; Mathur, S. ; Mosser, B. ; Régulo, C. ; Roxburgh, I. W. ; Auvergne, M. ; Baglin, A. ; Catala, C. ; Michel, E. ; Samadi, R. / A fresh look at the seismic spectrum of HD49933 : Analysis of 180 days of CoRoT photometry. In: Astronomy and Astrophysics. 2009 ; Vol. 507, No. 1.
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abstract = "Context. Solar-like oscillations have now been observed in several stars, thanks to ground-based spectroscopic observations and space-borne photometry. CoRoT, which has been in orbit since December 2006, has observed the star HD49933 twice. The oscillation spectrum of this star has proven difficult to interpret. Aims. Thanks to a new timeseries provided by CoRoT, we aim to provide a robust description of the oscillations in HD49933, i.e., to identify the degrees of the observed modes, and to measure mode frequencies, widths, amplitudes and the average rotational splitting.Methods. Several methods were used to model the Fourier spectrum: Maximum Likelihood Estimators and Bayesian analysis using Markov Chain Monte-Carlo techniques.Results. The different methods yield consistent result, and allow us to make a robust identification of the modes and to extract precise mode parameters. Only the rotational splitting remains difficult to estimate precisely, but is clearly relatively large (several μHz in size).",
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AU - Benomar, Othman

AU - Baudin, F.

AU - Campante, T. L.

AU - Chaplin, W. J.

AU - García, R. A.

AU - Gaulme, P.

AU - Toutain, T.

AU - Verner, G. A.

AU - Appourchaux, T.

AU - Ballot, J.

AU - Barban, C.

AU - Elsworth, Y.

AU - Mathur, S.

AU - Mosser, B.

AU - Régulo, C.

AU - Roxburgh, I. W.

AU - Auvergne, M.

AU - Baglin, A.

AU - Catala, C.

AU - Michel, E.

AU - Samadi, R.

PY - 2009/11/3

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N2 - Context. Solar-like oscillations have now been observed in several stars, thanks to ground-based spectroscopic observations and space-borne photometry. CoRoT, which has been in orbit since December 2006, has observed the star HD49933 twice. The oscillation spectrum of this star has proven difficult to interpret. Aims. Thanks to a new timeseries provided by CoRoT, we aim to provide a robust description of the oscillations in HD49933, i.e., to identify the degrees of the observed modes, and to measure mode frequencies, widths, amplitudes and the average rotational splitting.Methods. Several methods were used to model the Fourier spectrum: Maximum Likelihood Estimators and Bayesian analysis using Markov Chain Monte-Carlo techniques.Results. The different methods yield consistent result, and allow us to make a robust identification of the modes and to extract precise mode parameters. Only the rotational splitting remains difficult to estimate precisely, but is clearly relatively large (several μHz in size).

AB - Context. Solar-like oscillations have now been observed in several stars, thanks to ground-based spectroscopic observations and space-borne photometry. CoRoT, which has been in orbit since December 2006, has observed the star HD49933 twice. The oscillation spectrum of this star has proven difficult to interpret. Aims. Thanks to a new timeseries provided by CoRoT, we aim to provide a robust description of the oscillations in HD49933, i.e., to identify the degrees of the observed modes, and to measure mode frequencies, widths, amplitudes and the average rotational splitting.Methods. Several methods were used to model the Fourier spectrum: Maximum Likelihood Estimators and Bayesian analysis using Markov Chain Monte-Carlo techniques.Results. The different methods yield consistent result, and allow us to make a robust identification of the modes and to extract precise mode parameters. Only the rotational splitting remains difficult to estimate precisely, but is clearly relatively large (several μHz in size).

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