techniques: photometric; techniques: spectroscopic; binaries; eclipsing; stars: fundamental parameters; stars: low-mass; Astrophysics; - Solar and Stellar Astrophysics; Astrophysics - Earth and Planetary
Abstract :
[en] M-dwarfs are the most abundant stars in the galaxy and popular targets for exoplanet searches. However, their intrinsic faintness and complex spectra inhibit precise characterization. We only know of dozens of M-dwarfs with fundamental parameters of mass, radius, and effective temperature characterized to better than a few per cent. Eclipsing binaries remain the most robust means of stellar characterization. Here we present two targets from the Eclipsing Binary Low Mass (EBLM) survey that were observed with K2: EBLM J0055-00 and EBLM J2217-04. Combined with HARPS and CORALIE spectroscopy, we measure M-dwarf masses with precisions better than 5 per cent, radii better than 3 per cent, and effective temperatures on order 1 per cent. However, our fits require invoking a model to derive parameters for the primary star and fitting the M-dwarf using the transit and radial velocity observations. By investigating three popular stellar models, we determine that the model uncertainty in the primary star is of similar magnitude to the statistical uncertainty in the model fits of the secondary M-dwarf. Therefore, whilst these can be considered benchmark M-dwarfs, we caution the community to consider model uncertainty when pushing the limits of precise stellar characterization.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Duck, Alison; The Ohio State University
Martin, David V.; The Ohio State University, Sagan Fellow
Gill, Sam; University of Warwick, Department of Physics
Armitage, Tayt; The Ohio State University
Rodríguez Martínez, Romy; The Ohio State University
Maxted, Pierre F. L.; Keele University, Department of Physics and Astrophysics
Sebastian, Daniel; University of Birmingham, School of Physics and Astronomy
Sethi, Ritika; Department of Physical Sciences, Indian Institute of Science Education and Research, Berhampur, Odisha 760010, India
Swayne, Matthew I.; Keele University, Department of Physics and Astrophysics
Cameron, Andrew Collier; Scottish Universities Physics Alliance
Dransfield, Georgina; University of Birmingham, School of Physics and Astronomy
Gaudi, B. Scott; The Ohio State University
Gillon, Michaël ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO)
Hellier, Coel; Keele University, Department of Physics and Astrophysics
Kunovac, Vedad; Lowell Observatory, Arizona
Lovis, Christophe; Observatoire Astronomique de l'Université de Genéve, Chemin Pegasi 51, CH-1290 Versoix, Switzerland,
McCormac, James; University of Warwick, Department of Physics
Pepe, Francesco A.; Observatoire Astronomique de l'Université de Genéve, Chemin Pegasi 51, CH-1290 Versoix, Switzerland
Pollacco, Don; University of Warwick, Department of Physics
Sairam, Lalitha; University of Birmingham, School of Physics and Astronomy
Santerne, Alexandre; Aix Marseille Univ, CNRS, CNES, LAM, 38 rue Frédéric Joliot-Curie, F-13 388 Marseille, France,
Ségransan, Damien; Observatoire Astronomique de l'Université de Genéve, Chemin Pegasi 51, CH-1290 Versoix, Switzerland,
Standing, Matthew R.; University of Birmingham, School of Physics and Astronomy
Southworth, John; Keele University, Department of Physics and Astrophysics
Triaud, Amaury H. M. J.; University of Birmingham, School of Physics and Astronomy
Udry, Stephane; Observatoire Astronomique de l'Université de Genéve, Chemin Pegasi 51, CH-1290 Versoix, Switzerland,
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