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Article overview
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New substellar discoveries from Kepler and K2: Is there a brown dwarf desert? | | Theron Carmichael
; David Latham
; Andrew Vanderburg
; | | Date: |
7 Mar 2019 | | 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 $M_{b}=47.8pm
3.1{
m M_J}$, a radius of $R_{b}=0.819pm 0.035{
m R_J}$, and orbits its host
star in $P=5.17$ days. Its host star is a late F-type star with
$M_star=1.124pm 0.11{
m M_odot}$, $R_star=1.401pm 0.059{
m R_odot}$,
and $T_{
m eff}=6231 pm 51{
m K}$. KOI-607b has a mass of $M_{b}=94.4pm
3.4{
m M_J}$, a radius of $R_{b}=1.059pm 0.084{
m R_J}$, and an orbital
period of $P=5.89$ days. The primary star in the KOI-607 system is a G dwarf
with $M_star=0.983pm 0.053{
m M_odot}$, $R_star=0.903pm 0.032{
m
R_odot}$, and $T_{
m eff} = 5435pm 50{
m K}$. 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. | | Source: | arXiv, 1903.3118 | | Services: | Forum | Review | PDF | Favorites | |
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