Disentangling planetary orbits from stellar activity in radial-velocity surveys

R. D. Haywood; A. Collier Cameron; D. Queloz; S. C.C. Barros; M. Deleuil; R. Fares; M. Gillon; A. Hatzes; A. F. Lanza; C. Lovis; C. Moutou; F. Pepe; D. Pollacco; A. Santerne; D. Ségransan; Y. Unruh

doi:10.1017/S147355041300044X

Disentangling planetary orbits from stellar activity in radial-velocity surveys

R. D. Haywood, A. Collier Cameron, D. Queloz, S. C.C. Barros, M. Deleuil, R. Fares, M. Gillon, A. Hatzes, A. F. Lanza, C. Lovis, C. Moutou, F. Pepe, D. Pollacco, A. Santerne, D. Ségransan, Y. Unruh

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

The majority of extra-solar planets have been discovered (or confirmed after follow-up) through radial-velocity (RV) surveys. Using ground-based spectrographs such as High Accuracy Radial Velocity Planetary Search (HARPS) and HARPS-North, it is now possible to detect planets that are only a few times the mass of the Earth. However, the presence of dark spots on the stellar surface produces RV signals that are very similar in amplitude to those caused by orbiting low-mass planets. Disentangling these signals has thus become the biggest challenge in the detection of Earth-mass planets using RV surveys. To do so, we use the star's lightcurve to model the RV variations produced by spots. Here we present this method and show the results of its application to CoRoT-7.

Original language	English
Pages (from-to)	155-157
Number of pages	3
Journal	International Journal of Astrobiology
Volume	13
Issue number	2
DOIs	https://doi.org/10.1017/S147355041300044X
Publication status	Published - Apr 2014
Externally published	Yes

Keywords

astronomy
detection of Earth-mass planets
stellar activity
study of individual planetary systems: CoRoT-7
techniques: radial velocities

ASJC Scopus subject areas

Ecology, Evolution, Behavior and Systematics
Physics and Astronomy (miscellaneous)
Space and Planetary Science
Earth and Planetary Sciences (miscellaneous)

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10.1017/S147355041300044X

Cite this

Haywood, R. D., Cameron, A. C., Queloz, D., Barros, S. C. C., Deleuil, M., Fares, R., Gillon, M., Hatzes, A., Lanza, A. F., Lovis, C., Moutou, C., Pepe, F., Pollacco, D., Santerne, A., Ségransan, D., & Unruh, Y. (2014). Disentangling planetary orbits from stellar activity in radial-velocity surveys. International Journal of Astrobiology, 13(2), 155-157. https://doi.org/10.1017/S147355041300044X

Haywood, RD, Cameron, AC, Queloz, D, Barros, SCC, Deleuil, M, Fares, R, Gillon, M, Hatzes, A, Lanza, AF, Lovis, C, Moutou, C, Pepe, F, Pollacco, D, Santerne, A, Ségransan, D & Unruh, Y 2014, 'Disentangling planetary orbits from stellar activity in radial-velocity surveys', International Journal of Astrobiology, vol. 13, no. 2, pp. 155-157. https://doi.org/10.1017/S147355041300044X

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abstract = "The majority of extra-solar planets have been discovered (or confirmed after follow-up) through radial-velocity (RV) surveys. Using ground-based spectrographs such as High Accuracy Radial Velocity Planetary Search (HARPS) and HARPS-North, it is now possible to detect planets that are only a few times the mass of the Earth. However, the presence of dark spots on the stellar surface produces RV signals that are very similar in amplitude to those caused by orbiting low-mass planets. Disentangling these signals has thus become the biggest challenge in the detection of Earth-mass planets using RV surveys. To do so, we use the star's lightcurve to model the RV variations produced by spots. Here we present this method and show the results of its application to CoRoT-7.",

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AU - Barros, S. C.C.

AU - Deleuil, M.

AU - Fares, R.

AU - Gillon, M.

AU - Hatzes, A.

AU - Lanza, A. F.

AU - Lovis, C.

AU - Moutou, C.

AU - Pepe, F.

AU - Pollacco, D.

AU - Santerne, A.

AU - Ségransan, D.

AU - Unruh, Y.

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AB - The majority of extra-solar planets have been discovered (or confirmed after follow-up) through radial-velocity (RV) surveys. Using ground-based spectrographs such as High Accuracy Radial Velocity Planetary Search (HARPS) and HARPS-North, it is now possible to detect planets that are only a few times the mass of the Earth. However, the presence of dark spots on the stellar surface produces RV signals that are very similar in amplitude to those caused by orbiting low-mass planets. Disentangling these signals has thus become the biggest challenge in the detection of Earth-mass planets using RV surveys. To do so, we use the star's lightcurve to model the RV variations produced by spots. Here we present this method and show the results of its application to CoRoT-7.

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Disentangling planetary orbits from stellar activity in radial-velocity surveys

Abstract

Keywords

ASJC Scopus subject areas

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