Stellar jitter from variable gravitational redshift: implications for radial velocity confirmation of habitable exoplanets

Cegla, HM, Watson, CA, Marsh, TR, Shelyag, Sergiy, Moulds, V, Littlefair, S, Mathioudakis, M, Pollacco, D and Bonfils, X 2012, Stellar jitter from variable gravitational redshift: implications for radial velocity confirmation of habitable exoplanets, Monthly notices of the Royal Astronomical Society: letters, vol. 421, no. 1, pp. L54-L58, doi: 10.1111/j.1745-3933.2011.01205.x.

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Title Stellar jitter from variable gravitational redshift: implications for radial velocity confirmation of habitable exoplanets
Author(s) Cegla, HM
Watson, CA
Marsh, TR
Shelyag, SergiyORCID iD for Shelyag, Sergiy orcid.org/0000-0002-6436-9347
Moulds, V
Littlefair, S
Mathioudakis, M
Pollacco, D
Bonfils, X
Journal name Monthly notices of the Royal Astronomical Society: letters
Volume number 421
Issue number 1
Start page L54
End page L58
Total pages 5
Publisher Oxford University Press
Place of publication Oxford, Eng.
Publication date 2012-03
ISSN 1745-3933
Keyword(s) techniques: radial velocities
stars: activity
stars: late-type
planetary systems
Science & Technology
Physical Sciences
Astronomy & Astrophysics
Summary A variation of gravitational redshift, arising from stellar radius fluctuations, will introduce astrophysical noise into radial velocity measurements by shifting the centroid of the observed spectral lines. Shifting the centroid does not necessarily introduce line asymmetries. This is fundamentally different from other types of stellar jitter so far identified, which do result from line asymmetries. Furthermore, only a very small change in stellar radius, ~0.01 per cent, is necessary to generate a gravitational redshift variation large enough to mask or mimic an Earth-twin. We explore possible mechanisms for stellar radius fluctuations in low-mass stars. Convective inhibition due to varying magnetic field strengths and the Wilson depression of starspots are both found to induce substantial gravitational redshift variations. Finally, we investigate a possible method for monitoring/correcting this newly identified potential source of jitter and comment on its impact for future exoplanet searches.
Language eng
DOI 10.1111/j.1745-3933.2011.01205.x
Field of Research 0201 Astronomical And Space Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2012, The Authors
Persistent URL http://hdl.handle.net/10536/DRO/DU:30114959

Document type: Journal Article
Collection: School of Information Technology
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