The mass-radius relationship for very low mass stars: Four new discoveries from the HATSouth Survey

G. Zhou*, D. Bayliss, J. D. Hartman, G. A. Bakos, K. Penev, Z. Csubry, T. G. Tan, A. Jordán, L. Mancini, M. Rabus, R. Brahm, N. Espinoza, M. Mohler-Fischer, S. Ciceri, V. Suc, B. Csák, T. Henning, B. Schmidt

*Corresponding author for this work

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    Abstract

    We report the discovery of four transiting F-M binary systems with companions between 0.1 and 0.2M⊙ in mass by the HATSouth survey. These systems have been characterized via a global analysis of the HATSouth discovery data, combined with high-resolution radial velocities and accurate transit photometry observations. We determined the masses and radii of the component stars using a combination of two methods: isochrone fitting of spectroscopic primary star parameters and equating spectroscopic primary star rotation velocity with spin-orbit synchronization. These new very low mass companions are HATS550- 016B (0.110+0.005 -0.006M⊙, 0.147+0.003 -0.004 R⊙), HATS551-019B (0.17+0.01 -0.01M⊙, 0.18+0.01 -0.01 R⊙), HATS551-021B (0.132+0.014 -0.005M⊙, 0.154+0.006 -0.008 R⊙) and HATS553-001B (0.20+0.01 -0.02M⊙, 0.22+0.01 -0.01 R⊙). We examine our sample in the context of the radius anomaly for fully convective low-mass stars. Combining our sample with the 13 other well-studied very low mass stars, we find a tentative 5 per cent systematic deviation between the measured radii and theoretical isochrone models.

    Original languageEnglish
    Pages (from-to)2831-2844
    Number of pages14
    JournalMonthly Notices of the Royal Astronomical Society
    Volume437
    Issue number3
    DOIs
    Publication statusPublished - Jan 2014

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