The EBLM project - IX.: Five fully convective M-dwarfs, precisely measured with CHEOPS and TESS light curves

D. Sebastian; M. I. Swayne; P. F. L. Maxted; A. H. M. J. Triaud; S. G. Sousa; G. Olofsson; M. Beck; N. Billot; S. Hoyer; S. Gill; N. Heidari; D. V. Martin; C. M. Persson; M. R. Standing; Y. Alibert; R. Alonso; G. Anglada; J. Asquier; T. Bárczy; D. Barrado; S. C. C. Barros; M. P. Battley; W. Baumjohann; T. Beck; W. Benz; M. Bergomi; I. Boisse; X. Bonfils; A. Brandeker; C. Broeg; J. Cabrera; S. Charnoz; A. Collier Cameron; Sz Csizmadia; M. B. Davies; M. Deleuil; L. Delrez; O. D. S. Demangeon; B. -O. Demory; G. Dransfield; D. Ehrenreich; A. Erikson; A. Fortier; L. Fossati; M. Fridlund; D. Gandolfi; M. Gillon; M. Güdel; J. Hasiba; G. Hébrard; K. Heng; K. G. Isaak; L. L. Kiss; E. Kopp; V. Kunovac; J. Laskar; A. Lecavelier des Etangs; M. Lendl; C. Lovis; D. Magrin; J. McCormac; N. J. Miller; V. Nascimbeni; R. Ottensamer; I. Pagano; E. Pallé; F. A. Pepe; G. Peter; G. Piotto; D. Pollacco; D. Queloz; R. Ragazzoni; N. Rando; H. Rauer; I. Ribas; S. Lalitha; A. Santerne; N. C. Santos; G. Scandariato; D. Ségransan; A. E. Simon; A. M. S. Smith; M. Steller; Gy M. Szabó; N. Thomas; S. Udry; V. Van Grootel; N. A. Walton

doi:10.1093/mnras/stac2565

The EBLM project - IX. Five fully convective M-dwarfs, precisely measured with CHEOPS and TESS light curves

D. Sebastian^*, M. I. Swayne, P. F. L. Maxted, A. H. M. J. Triaud, S. G. Sousa, G. Olofsson, M. Beck, N. Billot, S. Hoyer, S. Gill, N. Heidari, D. V. Martin, C. M. Persson, M. R. Standing, Y. Alibert, R. Alonso, G. Anglada, J. Asquier, T. Bárczy, D. BarradoS. C. C. Barros, M. P. Battley, W. Baumjohann, T. Beck, W. Benz, M. Bergomi, I. Boisse, X. Bonfils, A. Brandeker, C. Broeg, J. Cabrera, S. Charnoz, A. Collier Cameron, Sz Csizmadia, M. B. Davies, M. Deleuil, L. Delrez, O. D. S. Demangeon, B. -O. Demory, G. Dransfield, D. Ehrenreich, A. Erikson, A. Fortier, L. Fossati, M. Fridlund, D. Gandolfi, M. Gillon, M. Güdel, J. Hasiba, G. Hébrard, K. Heng, K. G. Isaak, L. L. Kiss, E. Kopp, V. Kunovac, J. Laskar, A. Lecavelier des Etangs, M. Lendl, C. Lovis, D. Magrin, J. McCormac, N. J. Miller, V. Nascimbeni, R. Ottensamer, I. Pagano, E. Pallé, F. A. Pepe, G. Peter, G. Piotto, D. Pollacco, D. Queloz, R. Ragazzoni, N. Rando, H. Rauer, I. Ribas, S. Lalitha, A. Santerne, N. C. Santos, G. Scandariato, D. Ségransan, A. E. Simon, A. M. S. Smith, M. Steller, Gy M. Szabó, N. Thomas, S. Udry, V. Van Grootel, N. A. Walton

^*Corresponding author for this work

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Abstract

Eclipsing binaries are important benchmark objects to test and calibrate stellar structure and evolution models. This is especially true for binaries with a fully convective M-dwarf component for which direct measurements of these stars’ masses and radii are difficult using other techniques. Within the potential of M-dwarfs to be exoplanet host stars, the accuracy of theoretical predictions of their radius and effective temperature as a function of their mass is an active topic of discussion. Not only the parameters of transiting exoplanets but also the success of future atmospheric characterisation rely on accurate theoretical predictions. We present the analysis of five eclipsing binaries with low-mass stellar companions out of a sub-sample of 23, for which we obtained ultra high-precision light curves using the CHEOPS satellite. The observation of their primary and secondary eclipses are combined with spectroscopic measurements to precisely model the primary parameters and derive the M-dwarfs mass, radius, surface gravity, and effective temperature estimates using the PYCHEOPS data analysis software. Combining these results to the same set of parameters derived from TESS light curves, we find very good agreement (better than 1% for radius and better than 0.2% for surface gravity). We also analyse the importance of precise orbits from radial velocity measurements and find them to be crucial to derive M-dwarf radii in a regime below 5% accuracy. These results add five valuable data points to the mass-radius diagram of fully-convective M-dwarfs.

Original language	English
Article number	stac2565
Pages (from-to)	3546-3563
Number of pages	18
Journal	Monthly Notices of the Royal Astronomical Society
Volume	519
Issue number	3
DOIs	https://doi.org/10.1093/mnras/stac2565
Publication status	Published - 12 Sept 2022

Bibliographical note

19 pages, 12 figures, accepted for publication in MNRAS

Keywords

binaries: eclipsing
stars: fundamental parameters
stars: low-mass
techniques: photometric
techniques: spectroscopic

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Sebastian2023_the_EBLM_project_IXFinal published version, 3.64 MBLicence: Creative Commons: Attribution (CC BY)

Cite this

Sebastian, D., Swayne, M. I., Maxted, P. F. L., Triaud, A. H. M. J., Sousa, S. G., Olofsson, G., Beck, M., Billot, N., Hoyer, S., Gill, S., Heidari, N., Martin, D. V., Persson, C. M., Standing, M. R., Alibert, Y., Alonso, R., Anglada, G., Asquier, J., Bárczy, T., ... Walton, N. A. (2022). The EBLM project - IX. Five fully convective M-dwarfs, precisely measured with CHEOPS and TESS light curves. Monthly Notices of the Royal Astronomical Society, 519(3), 3546-3563. Article stac2565. https://doi.org/10.1093/mnras/stac2565

@article{4dcb1ccf3cd94514959a9b2d5cb3d903,

title = "The EBLM project - IX.: Five fully convective M-dwarfs, precisely measured with CHEOPS and TESS light curves",

abstract = "Eclipsing binaries are important benchmark objects to test and calibrate stellar structure and evolution models. This is especially true for binaries with a fully convective M-dwarf component for which direct measurements of these stars{\textquoteright} masses and radii are difficult using other techniques. Within the potential of M-dwarfs to be exoplanet host stars, the accuracy of theoretical predictions of their radius and effective temperature as a function of their mass is an active topic of discussion. Not only the parameters of transiting exoplanets but also the success of future atmospheric characterisation rely on accurate theoretical predictions. We present the analysis of five eclipsing binaries with low-mass stellar companions out of a sub-sample of 23, for which we obtained ultra high-precision light curves using the CHEOPS satellite. The observation of their primary and secondary eclipses are combined with spectroscopic measurements to precisely model the primary parameters and derive the M-dwarfs mass, radius, surface gravity, and effective temperature estimates using the PYCHEOPS data analysis software. Combining these results to the same set of parameters derived from TESS light curves, we find very good agreement (better than 1% for radius and better than 0.2% for surface gravity). We also analyse the importance of precise orbits from radial velocity measurements and find them to be crucial to derive M-dwarf radii in a regime below 5% accuracy. These results add five valuable data points to the mass-radius diagram of fully-convective M-dwarfs.",

keywords = "binaries: eclipsing, stars: fundamental parameters, stars: low-mass, techniques: photometric, techniques: spectroscopic",

author = "D. Sebastian and Swayne, {M. I.} and Maxted, {P. F. L.} and Triaud, {A. H. M. J.} and Sousa, {S. G.} and G. Olofsson and M. Beck and N. Billot and S. Hoyer and S. Gill and N. Heidari and Martin, {D. V.} and Persson, {C. M.} and Standing, {M. R.} and Y. Alibert and R. Alonso and G. Anglada and J. Asquier and T. B{\'a}rczy and D. Barrado and Barros, {S. C. C.} and Battley, {M. P.} and W. Baumjohann and T. Beck and W. Benz and M. Bergomi and I. Boisse and X. Bonfils and A. Brandeker and C. Broeg and J. Cabrera and S. Charnoz and Cameron, {A. Collier} and Sz Csizmadia and Davies, {M. B.} and M. Deleuil and L. Delrez and Demangeon, {O. D. S.} and Demory, {B. -O.} and G. Dransfield and D. Ehrenreich and A. Erikson and A. Fortier and L. Fossati and M. Fridlund and D. Gandolfi and M. Gillon and M. G{\"u}del and J. Hasiba and G. H{\'e}brard and K. Heng and Isaak, {K. G.} and Kiss, {L. L.} and E. Kopp and V. Kunovac and J. Laskar and Etangs, {A. Lecavelier des} and M. Lendl and C. Lovis and D. Magrin and J. McCormac and Miller, {N. J.} and V. Nascimbeni and R. Ottensamer and I. Pagano and E. Pall{\'e} and Pepe, {F. A.} and G. Peter and G. Piotto and D. Pollacco and D. Queloz and R. Ragazzoni and N. Rando and H. Rauer and I. Ribas and S. Lalitha and A. Santerne and Santos, {N. C.} and G. Scandariato and D. S{\'e}gransan and Simon, {A. E.} and Smith, {A. M. S.} and M. Steller and Szab{\'o}, {Gy M.} and N. Thomas and S. Udry and Grootel, {V. Van} and Walton, {N. A.}",

note = " 19 pages, 12 figures, accepted for publication in MNRAS",

year = "2022",

month = sep,

day = "12",

doi = "10.1093/mnras/stac2565",

language = "English",

volume = "519",

pages = "3546--3563",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "SIPRI/Oxford University Press",

number = "3",

}

Sebastian, D, Swayne, MI, Maxted, PFL, Triaud, AHMJ, Sousa, SG, Olofsson, G, Beck, M, Billot, N, Hoyer, S, Gill, S, Heidari, N, Martin, DV, Persson, CM, Standing, MR, Alibert, Y, Alonso, R, Anglada, G, Asquier, J, Bárczy, T, Barrado, D, Barros, SCC, Battley, MP, Baumjohann, W, Beck, T, Benz, W, Bergomi, M, Boisse, I, Bonfils, X, Brandeker, A, Broeg, C, Cabrera, J, Charnoz, S, Cameron, AC, Csizmadia, S, Davies, MB, Deleuil, M, Delrez, L, Demangeon, ODS, Demory, B-O, Dransfield, G, Ehrenreich, D, Erikson, A, Fortier, A, Fossati, L, Fridlund, M, Gandolfi, D, Gillon, M, Güdel, M, Hasiba, J, Hébrard, G, Heng, K, Isaak, KG, Kiss, LL, Kopp, E, Kunovac, V, Laskar, J, Etangs, ALD, Lendl, M, Lovis, C, Magrin, D, McCormac, J, Miller, NJ, Nascimbeni, V, Ottensamer, R, Pagano, I, Pallé, E, Pepe, FA, Peter, G, Piotto, G, Pollacco, D, Queloz, D, Ragazzoni, R, Rando, N, Rauer, H, Ribas, I, Lalitha, S, Santerne, A, Santos, NC, Scandariato, G, Ségransan, D, Simon, AE, Smith, AMS, Steller, M, Szabó, GM, Thomas, N, Udry, S, Grootel, VV & Walton, NA 2022, 'The EBLM project - IX. Five fully convective M-dwarfs, precisely measured with CHEOPS and TESS light curves', Monthly Notices of the Royal Astronomical Society, vol. 519, no. 3, stac2565, pp. 3546-3563. https://doi.org/10.1093/mnras/stac2565

TY - JOUR

T1 - The EBLM project - IX.

T2 - Five fully convective M-dwarfs, precisely measured with CHEOPS and TESS light curves

AU - Sebastian, D.

AU - Swayne, M. I.

AU - Maxted, P. F. L.

AU - Triaud, A. H. M. J.

AU - Sousa, S. G.

AU - Olofsson, G.

AU - Beck, M.

AU - Billot, N.

AU - Hoyer, S.

AU - Gill, S.

AU - Heidari, N.

AU - Martin, D. V.

AU - Persson, C. M.

AU - Standing, M. R.

AU - Alibert, Y.

AU - Alonso, R.

AU - Anglada, G.

AU - Asquier, J.

AU - Bárczy, T.

AU - Barrado, D.

AU - Barros, S. C. C.

AU - Battley, M. P.

AU - Baumjohann, W.

AU - Beck, T.

AU - Benz, W.

AU - Bergomi, M.

AU - Boisse, I.

AU - Bonfils, X.

AU - Brandeker, A.

AU - Broeg, C.

AU - Cabrera, J.

AU - Charnoz, S.

AU - Cameron, A. Collier

AU - Csizmadia, Sz

AU - Davies, M. B.

AU - Deleuil, M.

AU - Delrez, L.

AU - Demangeon, O. D. S.

AU - Demory, B. -O.

AU - Dransfield, G.

AU - Ehrenreich, D.

AU - Erikson, A.

AU - Fortier, A.

AU - Fossati, L.

AU - Fridlund, M.

AU - Gandolfi, D.

AU - Gillon, M.

AU - Güdel, M.

AU - Hasiba, J.

AU - Hébrard, G.

AU - Heng, K.

AU - Isaak, K. G.

AU - Kiss, L. L.

AU - Kopp, E.

AU - Kunovac, V.

AU - Laskar, J.

AU - Etangs, A. Lecavelier des

AU - Lendl, M.

AU - Lovis, C.

AU - Magrin, D.

AU - McCormac, J.

AU - Miller, N. J.

AU - Nascimbeni, V.

AU - Ottensamer, R.

AU - Pagano, I.

AU - Pallé, E.

AU - Pepe, F. A.

AU - Peter, G.

AU - Piotto, G.

AU - Pollacco, D.

AU - Queloz, D.

AU - Ragazzoni, R.

AU - Rando, N.

AU - Rauer, H.

AU - Ribas, I.

AU - Lalitha, S.

AU - Santerne, A.

AU - Santos, N. C.

AU - Scandariato, G.

AU - Ségransan, D.

AU - Simon, A. E.

AU - Smith, A. M. S.

AU - Steller, M.

AU - Szabó, Gy M.

AU - Thomas, N.

AU - Udry, S.

AU - Grootel, V. Van

AU - Walton, N. A.

N1 - 19 pages, 12 figures, accepted for publication in MNRAS

PY - 2022/9/12

Y1 - 2022/9/12

N2 - Eclipsing binaries are important benchmark objects to test and calibrate stellar structure and evolution models. This is especially true for binaries with a fully convective M-dwarf component for which direct measurements of these stars’ masses and radii are difficult using other techniques. Within the potential of M-dwarfs to be exoplanet host stars, the accuracy of theoretical predictions of their radius and effective temperature as a function of their mass is an active topic of discussion. Not only the parameters of transiting exoplanets but also the success of future atmospheric characterisation rely on accurate theoretical predictions. We present the analysis of five eclipsing binaries with low-mass stellar companions out of a sub-sample of 23, for which we obtained ultra high-precision light curves using the CHEOPS satellite. The observation of their primary and secondary eclipses are combined with spectroscopic measurements to precisely model the primary parameters and derive the M-dwarfs mass, radius, surface gravity, and effective temperature estimates using the PYCHEOPS data analysis software. Combining these results to the same set of parameters derived from TESS light curves, we find very good agreement (better than 1% for radius and better than 0.2% for surface gravity). We also analyse the importance of precise orbits from radial velocity measurements and find them to be crucial to derive M-dwarf radii in a regime below 5% accuracy. These results add five valuable data points to the mass-radius diagram of fully-convective M-dwarfs.

AB - Eclipsing binaries are important benchmark objects to test and calibrate stellar structure and evolution models. This is especially true for binaries with a fully convective M-dwarf component for which direct measurements of these stars’ masses and radii are difficult using other techniques. Within the potential of M-dwarfs to be exoplanet host stars, the accuracy of theoretical predictions of their radius and effective temperature as a function of their mass is an active topic of discussion. Not only the parameters of transiting exoplanets but also the success of future atmospheric characterisation rely on accurate theoretical predictions. We present the analysis of five eclipsing binaries with low-mass stellar companions out of a sub-sample of 23, for which we obtained ultra high-precision light curves using the CHEOPS satellite. The observation of their primary and secondary eclipses are combined with spectroscopic measurements to precisely model the primary parameters and derive the M-dwarfs mass, radius, surface gravity, and effective temperature estimates using the PYCHEOPS data analysis software. Combining these results to the same set of parameters derived from TESS light curves, we find very good agreement (better than 1% for radius and better than 0.2% for surface gravity). We also analyse the importance of precise orbits from radial velocity measurements and find them to be crucial to derive M-dwarf radii in a regime below 5% accuracy. These results add five valuable data points to the mass-radius diagram of fully-convective M-dwarfs.

KW - binaries: eclipsing

KW - stars: fundamental parameters

KW - stars: low-mass

KW - techniques: photometric

KW - techniques: spectroscopic

U2 - 10.1093/mnras/stac2565

DO - 10.1093/mnras/stac2565

M3 - Article

SN - 0035-8711

VL - 519

SP - 3546

EP - 3563

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 3

M1 - stac2565

ER -