New substellar discoveries from Kepler and K2: Is there a brown dwarf desert?

Theron W. Carmichael; David W. Latham; Andrew M. Vanderburg

doi:10.3847/1538-3881/ab245e

paper

New substellar discoveries from Kepler and K2: Is there a brown dwarf desert?

arXiv:1903.03118 · doi:10.3847/1538-3881/ab245e

Abstract

We present the discoveries of a brown dwarf and a low mass star from the Kepler and K2 missions. The newly discovered brown dwarf is EPIC 212036875b and the low mass star is KOI-607b. EPIC 212036875b has a mass of $M_{b} = 52.3 \pm 1.9 M_{J}$ , a radius of $R_{b} = 0.874 \pm 0.017 R_{J}$ , and orbits its host star in $P = 5.169885 \pm 0.000027$ days. Its host star is a late F-type star with $M_{⋆} = 1.288 \pm 0.065 M_{⊙}$ , $R_{⋆} = 1.498 \pm 0.025 R_{⊙}$ , and $T_{eff} = 6238 \pm 60$ K. KOI-607b has a mass of $M_{b} = 95.1 \pm 3.4 M_{J}$ , a radius of $R_{b} = 1.089 \pm 0.089 R_{J}$ , and an orbital period of $P = 5.89399148 \pm 0.00000060$ days. The primary star in the KOI-607 system is a G dwarf with $M_{⋆} = 0.993 \pm 0.052 M_{⊙}$ , $R_{⋆} = 0.915 \pm 0.031 R_{⊙}$ , and $T_{eff} = 5418 \pm 87$ K. We also revisit a brown dwarf, CWW 89Ab, that was previously published by Nowak et al. 2017 (under the designation EPIC 219388192b). CWW 89Ab is one of two known transiting brown dwarfs associated with a star cluster, which illustrates the need for more brown dwarfs with accurate masses and radii and reliable age determinations to test theoretical models. We find that the newly discovered brown dwarf, EPIC 212036875b, falls in the middle of the so-called "brown dwarf desert", indicating that EPIC 212036875b is either a particularly rare object, or the brown dwarf desert may not be so dry after all.

arXiv comment15 pages, 6 figures, 11 tables, accepted to AJ

New substellar discoveries from Kepler and K2: Is there a brown dwarf desert?

Abstract

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