IPERCOOL HERTS
Hugh Jones
IPERCOOL
SHANGHAI ASTRONOMICAL OBSERVATORY
ISTITUTO NAZIONALE DI ASTROFISICA
UNIVERSITY OF HERTFORDSHIRE
OBSERVATORIO NACIONAL
New astronomy
v
New astronomy
v
Low mass stars and brown dwarfs
Sun
–
M dwarf – L dwarf – T dwarf - Jupiter
Image credit: Dr. Robert Hurt, IPAC
Using WISE with UKIDSS/VISTA
Observations in thermal infrared
Composite JHK
4.5 microns
Pushing the limits of WISE!
Very late spectral type
Spectral type?
Coolest benchmark
Spectral fit
Models do NOT work
Shifted models
UKIDSS LAS candidate
T dwarfs from DR5–8.
Confirmed T dwarfs
are shown with blue
filled circles, with
arrows indicating
limits on J − H colours
for candidates from
the Y J only channel.
Based on the
canonical 5σ depth for
the LAS of H = 18.8.
Rejected candidates
are shown with filled
red squares, whilst
yet-to-be followed up
targets are shown
with open circles. For
reference, field stars
from a ran- domly
selected 1 square
degree region of LAS
sky are shown as
black dots.
New T dwarfs
Confirmed T dwarfs are
shown with blue filled circles,
with arrows indicating limits
on J − H colours for
candidates from the Y J only
channel. Limits are based on
the 5σ depth for the LAS of
H = 18.8. Rejected
candidates are shown with
filled red squares, whilst yetto-be followed up targets are
shown with open circles. For
reference, field stars from a
randomly selected 1 square
degree region of LAS sky are
shown as black dots.
Lots of
new T
dwarfs
DR8
Density
plot
IPERCOOL
SHANGHAI ASTRONOMICAL OBSERVATORY
ISTITUTO NAZIONALE DI ASTROFISICA
UNIVERSITY OF HERTFORDSHIRE
OBSERVATORIO NACIONAL