The Library
Estimating magnetic filling factors from simultaneous spectroscopy and photometry : disentangling spots, plage, and network
Tools
Tools
Tools
(2021) Estimating magnetic filling factors from simultaneous spectroscopy and photometry : disentangling spots, plage, and network. The Astrophysical Journal, 920 (1). 21. doi:10.3847/1538-4357/ac1266 ISSN 0004-637X.
|
PDF
WRAP-Estimating-magnetic-filling-factors-simultaneous-spectroscopy-photometry-disentangling-2022.pdf - Accepted Version - Requires a PDF viewer. Download (1042Kb) | Preview |
Official URL: http://dx.doi.org/10.3847/1538-4357/ac1266
Abstract
State-of-the-art radial velocity (RV) exoplanet searches are limited by the effects of stellar magnetic activity. Magnetically active spots, plage, and network regions each have different impacts on the observed spectral lines and therefore on the apparent stellar RV. Differentiating the relative coverage, or filling factors, of these active regions is thus necessary to differentiate between activity-driven RV signatures and Doppler shifts due to planetary orbits. In this work, we develop a technique to estimate feature-specific magnetic filling factors on stellar targets using only spectroscopic and photometric observations. We demonstrate linear and neural network implementations of our technique using observations from the solar telescope at HARPS-N, the HK Project at the Mt. Wilson Observatory, and the Total Irradiance Monitor onboard SORCE. We then compare the results of each technique to direct observations by the Solar Dynamics Observatory. Both implementations yield filling factor estimates that are highly correlated with the observed values. Modeling the solar RVs using these filling factors reproduces the expected contributions of the suppression of convective blueshift and rotational imbalance due to brightness inhomogeneities. Both implementations of this technique reduce the overall activity-driven rms RVs from 1.64 to 1.02 m s−1, corresponding to a 1.28 m s−1 reduction in the rms variation. The technique provides an additional 0.41 m s−1 reduction in the rms variation compared to traditional activity indicators.
| Item Type: | Journal Article | ||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Subjects: | Q Science > QB Astronomy | ||||||||||||||||||||||||||||||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||||||||||||||||||||||||||
| Library of Congress Subject Headings (LCSH): | Extrasolar planets -- Detection, Stars -- Motion in line of sight, Solar magnetic fields, Astronomy -- Observations | ||||||||||||||||||||||||||||||||||||
| Journal or Publication Title: | The Astrophysical Journal | ||||||||||||||||||||||||||||||||||||
| Publisher: | Institute of Physics Publishing, Inc. | ||||||||||||||||||||||||||||||||||||
| ISSN: | 0004-637X | ||||||||||||||||||||||||||||||||||||
| Official Date: | 8 October 2021 | ||||||||||||||||||||||||||||||||||||
| Dates: |
|
||||||||||||||||||||||||||||||||||||
| Volume: | 920 | ||||||||||||||||||||||||||||||||||||
| Number: | 1 | ||||||||||||||||||||||||||||||||||||
| Article Number: | 21 | ||||||||||||||||||||||||||||||||||||
| DOI: | 10.3847/1538-4357/ac1266 | ||||||||||||||||||||||||||||||||||||
| Status: | Peer Reviewed | ||||||||||||||||||||||||||||||||||||
| Publication Status: | Published | ||||||||||||||||||||||||||||||||||||
| Reuse Statement (publisher, data, author rights): | "This is an author-created, un-copyedited version of an article published in The Astrophysical Journal. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at http://dx.doi.org/10.3847/1538-4357/ac1266 | ||||||||||||||||||||||||||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||||||||||||||||||||||||||||||
| Date of first compliant deposit: | 18 March 2022 | ||||||||||||||||||||||||||||||||||||
| Date of first compliant Open Access: | 8 October 2022 | ||||||||||||||||||||||||||||||||||||
| RIOXX Funder/Project Grant: |
|
||||||||||||||||||||||||||||||||||||
| Related URLs: |
Request changes or add full text files to a record
Repository staff actions (login required)
 |
View Item |
Downloads
Downloads per month over past year
