Wide Binary Science Using Pan-STARRS1
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WIDE BINARY SCIENCE USING PAN-STARRS1
NIALL DEACON (MPIA)MICHAEL LIU, EUGENE MAGNIER, WILL BEST, KIMBERLY ALLER, MICHAEL KOTSON (HAWAII), BRENDAN BOWLER (CALTECH), ADAM KRAUS, TRENT DUPUY, ANDREW MANN (TEXAS)
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BREAKING THE DEGENERACY
Saumon & Marley models
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PSO 318-22:THE “LONELY PLANET”
Liu+ 2013
PSO J318.5−22 is the first free-floating object with the colors, spectra, magnitudes, luminosity, and mass that overlap the young dusty planets around HR 8799 and 2MASS J1207−39.
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PS1 + 2MASS SEARCH FINDS SUBSTELLAR MEMBERS OF YOUNG MOVING GROUPS
Wavelength (μm)
Flux
+ C
onst
ant
Incr
easi
ng A
ge
40 MJup
Kimberly Aller (IfA)
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BENCHMARK SYSTEMSWide companions to main sequence starsAge, distance and metallicity determined from primary
Break degeneracy
Formation mechanism for wide binaries uncertain
2MASS J
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BENCHMARKSWHAT ARE THEY GOOD FOR?
Testing atmospheric models of ultracool dwarfs.
Deacon et al. (2012) Burningham et al. (2009)
Higher order multiples can also have masses measured.
Dupuy et al. (2009,2014)
Used to define metallicity relations for M dwarfs. Mann et al. (2014), Newton et al. (2014), Royas-Ayala et al. (2012)
Huh! GoodGodY’all!
Starr et al. 1969
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SELECTING CANDIDATESInput primary list
High m Hipparcos starsM dwarfs from LSPM, rNLTT, Lepine & Gaidos (2011)
Search PS1 proper motions for objects with comparable proper motions (rmax = 10,000 AU or 20 arcmins)
Follow up companions with IRTF/SpeXHigh priority: zp1-yp1 > 0.8Back-up: J<15Preferentially followed up close (<5 arcmins) companions
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DISCOVERY SUMMARY
58 new companions31 known24 new Ls23 late Ms
Deacon et al. ApJ revised
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Open: total knownSolid: Our contribution
Doubled
82% more
Deacon et al. ApJ revised
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NEW ATMOSPHERIC MODELS REPRODUCE TEMPERATURES WELL
Deacon et al 2012
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HIGHER ORDER MULTIPLICITY8 of our objects are tertiary componentsOne companion showed usual water band absorption Spectra suggest L1 + T3
See Burgasser (2007), Dupuy & Liu (2012) for methodology
Keck NIRC2 LGS/AO0.12” binary>300 yr period
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WIDE COMPANIONS AND EXOPLANETS
Kaib et al. 2013
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Full proper motion survey of the Kepler field using all available data
GOALS
Probe effect of wide binarity on planet occurrenceWide binaries as tests of gyrochronologyTesting axial alignment of binariesPowerful legacy dataset to characterise Kepler planet hosts
PS1 KEPLER STANDARD PROJECT
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ASTROMETRIC ACCURACY
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PROBLEM AREAS
Reduced Proper MotionHr = r +5 + 5log10mHr = Mr + 5log10vt + const
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PS1 KEPLER STATUSCombining PS1 + 2MASS + POSS I & II+ UKIRT + WISE+SDSSWill rerun on corrected DVO database
Include Skyprobe data for bright KICsHigh resolution spectroscopic follow-up at McDonaldProbabilistic binary selectionSTS fieldRun on K2 fields?
TO-DO
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CLOSE BINARIES IN SYNOPTIC SURVEYSObjects have ≈50 observations in PS1True binaries will be more elliptical in better seeingCan be used to identify >0.4’’ binaries in PS1 data
0.4” binary
First used on PTF data by Terziev et al. (2012)
Blue histogram: objects not resolved as binaries with AO
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SUMMARY
Doubled the number of wide late M companions82% increase in wide late L companionsMost successful survey for benchmark companions to datePS1Kepler probing wide binary – planet connectionSynoptic surveys provide a wealth of data for discovering new multiple systems
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COINCIDENT?
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STABILITY
Deacon et al. ApJ revised