The EBLM project X.: Benchmark masses, radii and temperatures for two fully convective M-dwarfs using K2

Alison Duck; David V. Martin; Sam Gill; Tayt Armitage; Romy Rodríguez Martínez; Pierre F. L. Maxted; Daniel Sebastian; Ritika Sethi; Matthew I. Swayne; Andrew Collier Cameron; Georgina Dransfield; B. Scott Gaudi; Michael Gillon; Coel Hellier; Vedad Kunovac; Christophe Lovis; James McCormac; Francesco A. Pepe; Don Pollacco; Lalitha Sairam; Alexandre Santerne; Damien Ségransan; Matthew R. Standing; John Southworth; Amaury H. M. J. Triaud; Stephane Udry

doi:10.1093/mnras/stad452

The EBLM project X. Benchmark masses, radii and temperatures for two fully convective M-dwarfs using K2

Alison Duck^*, David V. Martin, Sam Gill, Tayt Armitage, Romy Rodríguez Martínez, Pierre F. L. Maxted, Daniel Sebastian, Ritika Sethi, Matthew I. Swayne, Andrew Collier Cameron, Georgina Dransfield, B. Scott Gaudi, Michael Gillon, Coel Hellier, Vedad Kunovac, Christophe Lovis, James McCormac, Francesco A. Pepe, Don Pollacco, Lalitha SairamAlexandre Santerne, Damien Ségransan, Matthew R. Standing, John Southworth, Amaury H. M. J. Triaud, Stephane Udry

^*Corresponding author for this work

Physics and Astronomy

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Abstract

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 characterisation. We only know of dozens of M-dwarfs with fundamental parameters of mass, radius and effective temperature characterised to better than a few per cent. Eclipsing binaries remain the most robust means of stellar characterisation. 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%, radii better than 3% and effective temperatures on order 1%. However, our fits require invoking a model to derive parameters for the primary star. By investigating three popular models, we determine that the model uncertainty is of similar magnitude to the statistical uncertainty in the model fits. Therefore, whilst these can be considered benchmark M-dwarfs, we caution the community to consider model uncertainty when pushing the limits of precise stellar characterisation.

Original language	English
Pages (from-to)	6305–6317
Number of pages	13
Journal	Monthly Notices of the Royal Astronomical Society
Volume	521
Issue number	4
DOIs	https://doi.org/10.1093/mnras/stad452
Publication status	Published - 24 Feb 2023

Bibliographical note

13 Pages, MNRAS Submission, Comments welcome

Keywords

astro-ph.SR
astro-ph.EP

Access to Document

10.1093/mnras/stad452Licence: None: All rights reserved

2208.10534v1
This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record, Alison Duck, David V Martin, Sam Gill, Tayt Armitage, Romy Rodríguez Martínez, Pierre F L Maxted, Daniel Sebastian, Ritika Sethi, Matthew I Swayne, Andrew Collier Cameron, Georgina Dransfield, B Scott Gaudi, Michael Gillon, Coel Hellier, Vedad Kunovac, Christophe Lovis, James McCormac, Francesco A Pepe, Don Pollacco, Lalitha Sairam, Alexandre Santerne, Damien Ségransan, Matthew R Standing, John Southworth, Amaury H M J Triaud, Stephane Udry, The EBLM project X. Benchmark masses, radii, and temperatures for two fully convective M-dwarfs using K2, Monthly Notices of the Royal Astronomical Society, Volume 521, Issue 4, June 2023, Pages 6305–6317, is available online at: https://doi.org/10.1093/mnras/stad452
Accepted author manuscript, 2.86 MBLicence: Other (please specify with Rights Statement)

Cite this

Duck, A., Martin, D. V., Gill, S., Armitage, T., Martínez, R. R., Maxted, P. F. L., Sebastian, D., Sethi, R., Swayne, M. I., Cameron, A. C., Dransfield, G., Gaudi, B. S., Gillon, M., Hellier, C., Kunovac, V., Lovis, C., McCormac, J., Pepe, F. A., Pollacco, D., ... Udry, S. (2023). The EBLM project X. Benchmark masses, radii and temperatures for two fully convective M-dwarfs using K2. Monthly Notices of the Royal Astronomical Society, 521(4), 6305–6317. https://doi.org/10.1093/mnras/stad452

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title = "The EBLM project X.: Benchmark masses, radii and temperatures for two fully convective M-dwarfs using K2",

abstract = " 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 characterisation. We only know of dozens of M-dwarfs with fundamental parameters of mass, radius and effective temperature characterised to better than a few per cent. Eclipsing binaries remain the most robust means of stellar characterisation. 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%, radii better than 3% and effective temperatures on order 1%. However, our fits require invoking a model to derive parameters for the primary star. By investigating three popular models, we determine that the model uncertainty is of similar magnitude to the statistical uncertainty in the model fits. Therefore, whilst these can be considered benchmark M-dwarfs, we caution the community to consider model uncertainty when pushing the limits of precise stellar characterisation. ",

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author = "Alison Duck and Martin, {David V.} and Sam Gill and Tayt Armitage and Mart{\'i}nez, {Romy Rodr{\'i}guez} and Maxted, {Pierre F. L.} and Daniel Sebastian and Ritika Sethi and Swayne, {Matthew I.} and Cameron, {Andrew Collier} and Georgina Dransfield and Gaudi, {B. Scott} and Michael Gillon and Coel Hellier and Vedad Kunovac and Christophe Lovis and James McCormac and Pepe, {Francesco A.} and Don Pollacco and Lalitha Sairam and Alexandre Santerne and Damien S{\'e}gransan and Standing, {Matthew R.} and John Southworth and Triaud, {Amaury H. M. J.} and Stephane Udry",

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day = "24",

doi = "10.1093/mnras/stad452",

language = "English",

volume = "521",

pages = "6305–6317",

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Duck, A, Martin, DV, Gill, S, Armitage, T, Martínez, RR, Maxted, PFL, Sebastian, D, Sethi, R, Swayne, MI, Cameron, AC, Dransfield, G, Gaudi, BS, Gillon, M, Hellier, C, Kunovac, V, Lovis, C, McCormac, J, Pepe, FA, Pollacco, D, Sairam, L, Santerne, A, Ségransan, D, Standing, MR, Southworth, J, Triaud, AHMJ & Udry, S 2023, 'The EBLM project X. Benchmark masses, radii and temperatures for two fully convective M-dwarfs using K2', Monthly Notices of the Royal Astronomical Society, vol. 521, no. 4, pp. 6305–6317. https://doi.org/10.1093/mnras/stad452

TY - JOUR

T1 - The EBLM project X.

T2 - Benchmark masses, radii and temperatures for two fully convective M-dwarfs using K2

AU - Duck, Alison

AU - Martin, David V.

AU - Gill, Sam

AU - Armitage, Tayt

AU - Martínez, Romy Rodríguez

AU - Maxted, Pierre F. L.

AU - Sebastian, Daniel

AU - Sethi, Ritika

AU - Swayne, Matthew I.

AU - Cameron, Andrew Collier

AU - Dransfield, Georgina

AU - Gaudi, B. Scott

AU - Gillon, Michael

AU - Hellier, Coel

AU - Kunovac, Vedad

AU - Lovis, Christophe

AU - McCormac, James

AU - Pepe, Francesco A.

AU - Pollacco, Don

AU - Sairam, Lalitha

AU - Santerne, Alexandre

AU - Ségransan, Damien

AU - Standing, Matthew R.

AU - Southworth, John

AU - Triaud, Amaury H. M. J.

AU - Udry, Stephane

N1 - 13 Pages, MNRAS Submission, Comments welcome

PY - 2023/2/24

Y1 - 2023/2/24

N2 - 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 characterisation. We only know of dozens of M-dwarfs with fundamental parameters of mass, radius and effective temperature characterised to better than a few per cent. Eclipsing binaries remain the most robust means of stellar characterisation. 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%, radii better than 3% and effective temperatures on order 1%. However, our fits require invoking a model to derive parameters for the primary star. By investigating three popular models, we determine that the model uncertainty is of similar magnitude to the statistical uncertainty in the model fits. Therefore, whilst these can be considered benchmark M-dwarfs, we caution the community to consider model uncertainty when pushing the limits of precise stellar characterisation.

AB - 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 characterisation. We only know of dozens of M-dwarfs with fundamental parameters of mass, radius and effective temperature characterised to better than a few per cent. Eclipsing binaries remain the most robust means of stellar characterisation. 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%, radii better than 3% and effective temperatures on order 1%. However, our fits require invoking a model to derive parameters for the primary star. By investigating three popular models, we determine that the model uncertainty is of similar magnitude to the statistical uncertainty in the model fits. Therefore, whilst these can be considered benchmark M-dwarfs, we caution the community to consider model uncertainty when pushing the limits of precise stellar characterisation.

KW - astro-ph.SR

KW - astro-ph.EP

U2 - 10.1093/mnras/stad452

DO - 10.1093/mnras/stad452

M3 - Article

SN - 0035-8711

VL - 521

SP - 6305

EP - 6317

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -