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Spectral line depth variability in radial velocity spectra
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Wise, Alexander, Plavchan, Peter, Dumusque, Xavier, Cegla, H. M. and Wright, Duncan (2022) Spectral line depth variability in radial velocity spectra. The Astrophysical Journal, 930 (2). 121. doi:10.3847/1538-4357/ac649b ISSN 0004-637X.
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WRAP-spectral-line-depth-variability-radial-velocity-spectra-Cegla-2022.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (1658Kb) | Preview |
Official URL: https://doi.org/10.3847/1538-4357/ac649b
Abstract
Stellar active regions, including spots and faculae, can create radial velocity (RV) signals that interfere with the detection and mass measurements of low-mass exoplanets. In doing so, these active regions affect each spectral line differently, but the origin of these differences is not fully understood. Here we explore how spectral line variability correlated with S-index (Ca H and K emission) is related to the atomic properties of each spectral line. Next, we develop a simple analytic stellar atmosphere model that can account for the largest sources of line variability with S-index. Then, we apply this model to HARPS spectra of α Cen B to explain Fe i line depth changes in terms of a disk-averaged temperature difference between active and quiet regions on the visible hemisphere of the star. This work helps establish a physical basis for understanding how stellar activity manifests differently in each spectral line and may help future work mitigating the impact of stellar activity on exoplanet RV surveys.
| Item Type: | Journal Article | ||||||||||||||||||||||||||||||
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| Subjects: | Q Science > QB Astronomy | ||||||||||||||||||||||||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||||||||||||||||||||
| SWORD Depositor: | Library Publications Router | ||||||||||||||||||||||||||||||
| Library of Congress Subject Headings (LCSH): | Extrasolar planets -- Detection, Astronomy -- Observations, Astrophysics, Observations, Astronomical, Stars with planets, Stellar activity | ||||||||||||||||||||||||||||||
| Journal or Publication Title: | The Astrophysical Journal | ||||||||||||||||||||||||||||||
| Publisher: | Institute of Physics Publishing, Inc. | ||||||||||||||||||||||||||||||
| ISSN: | 0004-637X | ||||||||||||||||||||||||||||||
| Official Date: | 11 May 2022 | ||||||||||||||||||||||||||||||
| Dates: |
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| Volume: | 930 | ||||||||||||||||||||||||||||||
| Number: | 2 | ||||||||||||||||||||||||||||||
| Article Number: | 121 | ||||||||||||||||||||||||||||||
| DOI: | 10.3847/1538-4357/ac649b | ||||||||||||||||||||||||||||||
| Status: | Peer Reviewed | ||||||||||||||||||||||||||||||
| Publication Status: | Published | ||||||||||||||||||||||||||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||||||||||||||||||||||||||
| Date of first compliant deposit: | 8 June 2022 | ||||||||||||||||||||||||||||||
| Date of first compliant Open Access: | 9 June 2022 | ||||||||||||||||||||||||||||||
| RIOXX Funder/Project Grant: |
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