http://arxiv.org/abs/1903.03118
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 $M_{b}=47.8\pm 3.1{\rm M_J}$, a radius of $R_{b}=0.819\pm 0.035{\rm R_J}$, and orbits its host star in $P=5.17$ days. Its host star is a late F-type star with $M_\star=1.124\pm 0.11{\rm M_\odot}$, $R_\star=1.401\pm 0.059{\rm R_\odot}$, and $T_{\rm eff}=6231 \pm 51{\rm K}$. KOI-607b has a mass of $M_{b}=94.4\pm 3.4{\rm M_J}$, a radius of $R_{b}=1.059\pm 0.084{\rm R_J}$, and an orbital period of $P=5.89$ days. The primary star in the KOI-607 system is a G dwarf with $M_\star=0.983\pm 0.053{\rm M_\odot}$, $R_\star=0.903\pm 0.032{\rm R_\odot}$, and $T_{\rm eff} = 5435\pm 50{\rm K}$. We also revisit a brown dwarf, CWW 89Ab, that was previously published by Nowak et al. (2017) (under the designation EPIC 219388192b) and report a smaller measurement of its radius than the previous work. CWW 89Ab is the only known brown dwarf associated with a star cluster (Ruprecht 147) 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.
T. Carmichael, D. Latham and A. Vanderburg
Mon, 11 Mar 19
75/78
Comments: 15 pages, 6 figures, submitted to AJ, email lead author for machine readable file of Table 7