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

Kavli Affiliate: Andrew M. Vanderburg

| First 5 Authors: Theron W. Carmichael, David W. Latham, Andrew M. Vanderburg, ,

| Summary:

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}=52.3pm
1.9M_J$, a radius of $ R_{b}=0.874pm 0.017R_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_star=1.288pm 0.065M_odot$, $ R_star=1.498pm 0.025R_odot$, and $ T_{rm
eff}=6238 pm 60$K. KOI-607b has a mass of $ M_{b}=95.1pm 3.4M_J$, a radius of
$ R_{b}=1.089pm 0.089R_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_star=0.993pm 0.052M_odot$, $ R_star=0.915pm 0.031R_odot$, and $ T_{rm
eff} = 5418pm 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.

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