characterizing a cold brown dwarf companion to a white...
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CharacterizingaColdBrownDwarfCompaniontoaWhiteDwarf
ChrisGelinoArchiveScien<st:KeckObservatoryArchive
R.Hurt(IPAC)
CharacterizingaColdBrownDwarfCompaniontoaWhiteDwarf
ChrisGelinoArchiveScien<st:KeckObservatoryArchive
R.Hurt(IPAC)
WarmPlanetary
BrownDwarfsasExoplanetAnalogs
• Canstudyold,planetmassobjectswithouthoststarcontamina<on
• Effec<vetemperatures~300-2000K• Massesdownto<10Mjup
• Radii~Rjup
Evolu<onaryTracks
Burrowsetal.(1997)
WD0806-661B
.0 0.4 1.1 2.6 5.5 11.3 22.9 45.9 92.3 184.1 367
• FoundbyLuhmanetal.(2011)– Lookedatmul<-epochIRACimagesofnearbystarswithsignificantmo<on
– Searchedforobjectswithcommonmo<onsinthefields
– Foundafaintmo<oncompaniontothewhitedwarfWD0806-661.
IRAC[4.5]2004Dec15
WD0806-661B
0.0 0.2 0.6 1.4 2.9 6.1 12.3 24.7 49.6 99.1 197
IRAC[4.5]2009Apr24
• FoundbyLuhmanetal.(2011)– Lookedatmul<-epochIRACimagesofnearbystarswithsignificantmo<on
– Searchedforobjectswithcommonmo<onsinthefields
– Foundafaintmo<oncompaniontothewhitedwarfWD0806-661.
WD0806-661B
Luhmanetal.(2011)
120”
[4.5]=16.75+/-0.05magJ>23.9magDistance=19.2+/-0.6pcAge=2.0+0.5-0.5Gyr(Luhmanetal.2012)
FirstHSTDetec<on(F110W)
044 -0.021 0.0021 0.026 0.049 0.072 0.095 0.12 0.14 0.17 0.1
2013Aug8
Luhmanetal.(2014)
FirstHSTDetec<on(F110W)
F110W=25.70+/-0.08[3.6]=19.65+/-0.15[4.5]=16.88+/-0.05J-[4.5]≈8.12Age=2.0+0.5-0.5GyrMass=6-9MjupTeff=300-345K
Luhmanetal.(2014)J-[4.5]
M4.5
WD0806B
FillingOuttheSED
• 7HSTorbitstogetphotometryinF105W,F125W,F127M,andF160WwithWFC3/IR
• Complementsexis<ngF110W,[3.6],and[4.5]data
• Goalistobekerconstrainthephysicalproper<esinferredfromthemodels
HSTData
044 -0.021 0.0021 0.026 0.049 0.072 0.095 0.12 0.14 0.17 0.1
2013Aug8
HSTData
044 -0.021 0.0021 0.026 0.049 0.072 0.095 0.12 0.14 0.17 0.1
000 0.0095 0.0191 0.0287 0.0383 0.0479 0.0575 0.0670 0.0767 0.0862 0.09
10"
2014Feb22
AllPhotometry
F105W 25.72+/-0.11 Gelinoetal.(inprep)
F110W 25.70+/-0.0825.62+/-0.09
Luhmanetal.(2014)Gelinoetal.(inprep)
F125W 25.85+/-0.14 Gelinoetal.(inprep)
F127M 24.85+/-0.19 Gelinoetal.(inprep)
F160W 25.10+/-0.13 Gelinoetal.(inprep)
[3.6] 19.65+/-0.15 Luhmanetal.(2012)
[4.5] 16.88+/-0.05 Luhmanetal.(2012)
Comparisontootherbrowndwarfs
Schneideretal(2016)
Comparisontootherbrowndwarfs
Schneideretal(2016)
CollapseoftheWienTail?
ModelFimng
200 400 600 800
3.00
3.25
3.50
3.75
4.00
4.25
4.50
4.75
5.00
5.25
5.50
200 400 600 800
3.00
3.25
3.50
3.75
4.00
4.25
4.50
4.75
5.00
5.25
5.50
Morley et al. (2014)
200 400 600 800
3.00
3.25
3.50
3.75
4.00
4.25
4.50
4.75
5.00
5.25
5.50
200 400 600 800
3.00
3.25
3.50
3.75
4.00
4.25
4.50
4.75
5.00
5.25
5.50
Tremblin et al. (2015)
200 400 600 800
3.00
3.25
3.50
3.75
4.00
4.25
4.50
4.75
5.00
5.25
5.50
200 400 600 800
3.00
3.25
3.50
3.75
4.00
4.25
4.50
4.75
5.00
5.25
5.50
Burrows et al. (2003)
200 400 600 800
3.00
3.25
3.50
3.75
4.00
4.25
4.50
4.75
5.00
5.25
5.50
200 400 600 800
3.00
3.25
3.50
3.75
4.00
4.25
4.50
4.75
5.00
5.25
5.50
Saumon et al. (2012)
200 400 600 800
3.00
3.25
3.50
3.75
4.00
4.25
4.50
4.75
5.00
5.25
5.50
50%waterclouds
100%waterclouds Noclouds
NocloudsNon-eqchem.
ModelFimng
200 400 600 800
3.00
3.25
3.50
3.75
4.00
4.25
4.50
4.75
5.00
5.25
5.50
200 400 600 800
3.00
3.25
3.50
3.75
4.00
4.25
4.50
4.75
5.00
5.25
5.50
Morley et al. (2014)
200 400 600 800
3.00
3.25
3.50
3.75
4.00
4.25
4.50
4.75
5.00
5.25
5.50
200 400 600 800
3.00
3.25
3.50
3.75
4.00
4.25
4.50
4.75
5.00
5.25
5.50
Tremblin et al. (2015)
200 400 600 800
3.00
3.25
3.50
3.75
4.00
4.25
4.50
4.75
5.00
5.25
5.50
200 400 600 800
3.00
3.25
3.50
3.75
4.00
4.25
4.50
4.75
5.00
5.25
5.50
Burrows et al. (2003)
200 400 600 800
3.00
3.25
3.50
3.75
4.00
4.25
4.50
4.75
5.00
5.25
5.50
200 400 600 800
3.00
3.25
3.50
3.75
4.00
4.25
4.50
4.75
5.00
5.25
5.50
Saumon et al. (2012)
200 400 600 800
3.00
3.25
3.50
3.75
4.00
4.25
4.50
4.75
5.00
5.25
5.50
Mass=4-9MJupTeff=350-400K
FindingtheBest-fitModel
Conclusions• WD0806-661BissimilartotheYdwarfWISE1828+2650thoughislikelywarmer.
• FromModelfimng,Teff~350-400Kwithlog(g)>4.5– Notafeasiblecombina<onforanageof2Gyr
• Noneoftheexploredmodelsdoagreatjobfimngthenear-IR+IRdata(probablyrelatedtonon-equilibriumchemistryandclouds)
• ToofaintforHSTspectrum–excellentJWSTtarget!
ModelFimng:noSpitzer
200 400 600 800
3.00
3.25
3.50
3.75
4.00
4.25
4.50
4.75
5.00
5.25
5.50
200 400 600 800
3.00
3.25
3.50
3.75
4.00
4.25
4.50
4.75
5.00
5.25
5.50
Morley et al. (2014)
200 400 600 800
3.00
3.25
3.50
3.75
4.00
4.25
4.50
4.75
5.00
5.25
5.50
200 400 600 800
3.00
3.25
3.50
3.75
4.00
4.25
4.50
4.75
5.00
5.25
5.50
Tremblin et al. (2015)
200 400 600 800
3.00
3.25
3.50
3.75
4.00
4.25
4.50
4.75
5.00
5.25
5.50
200 400 600 800
3.00
3.25
3.50
3.75
4.00
4.25
4.50
4.75
5.00
5.25
5.50
Burrows et al. (2003)
200 400 600 800
3.00
3.25
3.50
3.75
4.00
4.25
4.50
4.75
5.00
5.25
5.50
200 400 600 800
3.00
3.25
3.50
3.75
4.00
4.25
4.50
4.75
5.00
5.25
5.50
Saumon et al. (2012)
200 400 600 800
3.00
3.25
3.50
3.75
4.00
4.25
4.50
4.75
5.00
5.25
5.50
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