# HAT-TR-318-007: A Double-lined M Dwarf Binary with Total Secondary Eclipses Discovered by HATNet and Observed by K2

## Author(s): Hartman, Joel D.; Quinn, SN; Bakos, Gaspar Aron; Torres, G; Kovács, G; et al

To refer to this page use: http://arks.princeton.edu/ark:/88435/pr18q5h
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dc.contributor.authorHartman, Joel D.-
dc.contributor.authorQuinn, SN-
dc.contributor.authorBakos, Gaspar Aron-
dc.contributor.authorTorres, G-
dc.contributor.authorKovács, G-
dc.contributor.authorLatham, David W.-
dc.contributor.authorNoyes, Robert W.-
dc.contributor.authorShporer, A-
dc.contributor.authorFulton, BJ-
dc.contributor.authorEsquerdo, GA-
dc.contributor.authorEverett, ME-
dc.contributor.authorPenev, K-
dc.contributor.authorBhatti, W-
dc.contributor.authorCsubry, Zoltan-
dc.date.accessioned2019-04-10T19:32:07Z-
dc.date.available2019-04-10T19:32:07Z-
dc.date.issued2018-03en_US
dc.identifier.citationHartman, JD, Quinn, SN, Bakos, GÁ, Torres, G, Kovács, G, Latham, DW, Noyes, RW, Shporer, A, Fulton, BJ, Esquerdo, GA, Everett, ME, Penev, K, Bhatti, W, Csubry, Z. (2018). HAT-TR-318-007: A Double-lined M Dwarf Binary with Total Secondary Eclipses Discovered by HATNet and Observed by K2. \aj, 155 (114 - 114. doi:10.3847/1538-3881/aaa844en_US
dc.identifier.urihttp://arks.princeton.edu/ark:/88435/pr18q5h-
dc.description.abstractWe report the discovery by the HATNet survey of HAT-TR-318-007, a P =  3.34395390 0.00000020 day period detached double-lined M dwarf binary with total secondary eclipses. We combine radial velocity (RV) measurements from TRES/FLWO 1.5 m and time-series photometry from HATNet, FLWO 1.2 m, BOS 0.8 m, and NASA K2 Campaign 5, to determine the masses and radii of the component stars: MA 0.448 0.011N =  , MB 0.2721 0.0042 = - +0.0041 N , RA 0.4548 0.0036 = - +0.0035 N , and RB 0.2913 0.0024 = - +0.0023 N . We obtained a FIRE/Magellan near-infrared spectrum of the primary star during a total secondary eclipse, and we use this to obtain disentangled spectra of both components. We determine spectral types of ST M3.71 0.69 A =  and ST M5.01 0.73 B =  and effective temperatures of Teff,A =  3190 110 K and Teff,B =  3100 110 K for the primary and secondary star, respectively. We also measure a metallicity of [Fe/H]=+  0.298 0.080 for the system. We find that the system has a small, but significant, nonzero eccentricity of 0.0136 0.0026  . The K2 light curve shows a coherent variation at a period of 3.41315 0.00032 0.00030 - + days, which is slightly longer than the orbital period, and which we demonstrate comes from the primary star. We interpret this as the rotation period of the primary. We perform a quantitative comparison between the Dartmouth stellar evolution models and the seven systems, including HATTR-318-007, that contain M dwarfs with 0.2 0.5     N N < < M , have metallicity measurements, and have masses and radii determined to better than 5% precision. Discrepancies between the predicted and observed masses and radii are found for three of the systems.en_US
dc.language.isoen_USen_US
dc.relation.ispartofAstronomical Journalen_US
dc.rightsFinal published version. This is an open access article.en_US
dc.titleHAT-TR-318-007: A Double-lined M Dwarf Binary with Total Secondary Eclipses Discovered by HATNet and Observed by K2en_US
dc.typeJournal Articleen_US
dc.identifier.doidoi:10.3847/1538-3881/aaa844-
dc.date.eissued2018-02-14en_US
pu.type.symplectichttp://www.symplectic.co.uk/publications/atom-terms/1.0/journal-articleen_US

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