S. Gill
The EBLM Project VI. The mass and radius of five low-mass stars in F+M binaries discovered by the WASP survey
Gill, S.; Maxted, P.F.L.; Evans, J.A.; Evans, D.F.; Smalley, B.; Gary, B.L.; Southworth, J.; Anderson, D.R.; Bouchy, F.; Cameron, A.C.; Dominik, M.; Faedi, F.; Gillon, M.; Gomez Maqueo Chew, Y.; Hebb, L.; Hellier, C.; Jørgensen, U.G.; Longa-Peña, P.; Martin, D.V.; McCormac, J.; Pepe, F.V.; Pollaco, D.; Queloz, D.; Ségransan, D.; Snodgrass, C.; Turner, O.D.; Triaud, A.H.M.; Udry, S.; West, R.G.
Authors
Pierre Maxted p.maxted@keele.ac.uk
J.A. Evans
D.F. Evans
Barry Smalley b.smalley@keele.ac.uk
B.L. Gary
Dr John Taylor j.k.taylor@keele.ac.uk
D.R. Anderson
F. Bouchy
A.C. Cameron
M. Dominik
F. Faedi
M. Gillon
Y. Gomez Maqueo Chew
L. Hebb
Coel Hellier c.hellier@keele.ac.uk
U.G. Jørgensen
P. Longa-Peña
D.V. Martin
J. McCormac
F.V. Pepe
D. Pollaco
D. Queloz
D. Ségransan
C. Snodgrass
O.D. Turner
A.H.M. Triaud
S. Udry
R.G. West
Abstract
Some M-dwarfs around F-/G-type stars have been measured to be hotter and larger than predicted by stellar evolution models. Inconsistencies between observations and models need addressing with more mass, radius and luminosity measurements of low-mass stars to test and refine evolutionary models. Our aim is to measure the masses, radii and ages of the stars in five low-mass eclipsing binary systems discovered by the WASP survey. We use WASP photometry to establish eclipse-time ephemerides and to obtain initial estimates for the transit depth and width. Radial velocity measurements were simultaneously fitted with follow-up photometry to find the best-fitting orbital solution. This solution was combined with measurements of atmospheric parameters to interpolate evolutionary models and estimate the mass of the primary star, and the mass and radius of the M-dwarf companion. We assess how the best fitting orbital solution changes if an alternative limb-darkening law is used and quantify the systematic effects of unresolved companions. We also gauge how the best-fitting evolutionary model changes if different values are used for the mixing length parameter and helium enhancement. We report the mass and radius of five M-dwarfs and find little evidence of inflation with respect to evolutionary models. The primary stars in two systems are near the ``blue hook'' stage of their post sequence evolution, resulting in two possible solutions for mass and age. We find that choices in helium enhancement and mixing-length parameter can introduce an additional 3-5\,\% uncertainty in measured M-dwarf mass. Unresolved companions can introduce an additional 3-8\% uncertainty in the radius of an M-dwarf, while the choice of limb-darkening law can introduce up to an additional 2\% uncertainty.
Citation
Gill, S., Maxted, P., Evans, J., Evans, D., Smalley, B., Gary, B., …West, R. (2019). The EBLM Project VI. The mass and radius of five low-mass stars in F+M binaries discovered by the WASP survey. Astronomy & Astrophysics, 626, Article A119. https://doi.org/10.1051/0004-6361/201833054
Journal Article Type | Article |
---|---|
Acceptance Date | Apr 29, 2019 |
Online Publication Date | Jun 24, 2019 |
Publication Date | 2019-06 |
Journal | Astronomy & Astrophysics |
Print ISSN | 0004-6361 |
Publisher | EDP Sciences |
Peer Reviewed | Peer Reviewed |
Volume | 626 |
Article Number | A119 |
DOI | https://doi.org/10.1051/0004-6361/201833054 |
Keywords | binaries, eclipsing, stars, atmospheres |
Publisher URL | https://doi.org/10.1051/0004-6361/201833054 |
Files
smalley-2019-eblm-project-6-mass-and-radius-of-five-low-mass-stars.pdf
(2.1 Mb)
PDF
You might also like
Spitzer Dayside Emission of WASP-34b
(2022)
Journal Article
Downloadable Citations
About Keele Repository
Administrator e-mail: research.openaccess@keele.ac.uk
This application uses the following open-source libraries:
SheetJS Community Edition
Apache License Version 2.0 (http://www.apache.org/licenses/)
PDF.js
Apache License Version 2.0 (http://www.apache.org/licenses/)
Font Awesome
SIL OFL 1.1 (http://scripts.sil.org/OFL)
MIT License (http://opensource.org/licenses/mit-license.html)
CC BY 3.0 ( http://creativecommons.org/licenses/by/3.0/)
Powered by Worktribe © 2024
Advanced Search