wide binary science using pan-starrs1 niall deacon (mpia) michael liu, eugene magnier, will best,...
TRANSCRIPT
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)
BREAKING THE DEGENERACY
Saumon & Marley models
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.
PS1 + 2MASS SEARCH FINDS SUBSTELLAR MEMBERS OF YOUNG MOVING GROUPS
Wavelength (μm)
Flu
x +
Con
stan
t
Incr
easi
ng A
ge
40 MJup
Kimberly Aller (IfA)
BENCHMARK SYSTEMSWide companions to main sequence stars
Age, distance and metallicity determined from primary
Break degeneracy
Formation mechanism for wide binaries uncertain
2MASS J
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
SELECTING CANDIDATES
Input primary listHigh 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
DISCOVERY SUMMARY
58 new companions
31 known
24 new Ls
23 late Ms
Deacon et al. ApJ revised
Open: total knownSolid: Our contribution
Doubled
82% more
Deacon et al. ApJ revised
NEW ATMOSPHERIC MODELS REPRODUCE TEMPERATURES WELL
Deacon et al 2012
HIGHER ORDER MULTIPLICITY
8 of our objects are tertiary components
One 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
WIDE COMPANIONS AND EXOPLANETS
Kaib et al. 2013
Full proper motion survey of the Kepler field using all available data
GOALS
Probe effect of wide binarity on planet occurrence
Wide binaries as tests of gyrochronology
Testing axial alignment of binaries
Powerful legacy dataset to characterise Kepler planet hosts
PS1 KEPLER STANDARD PROJECT
ASTROMETRIC ACCURACY
PROBLEM AREAS
Reduced Proper MotionHr = r +5 + 5log10mHr = Mr + 5log10vt + const
PS1 KEPLER STATUS
Combining PS1 + 2MASS + POSS I & II+ UKIRT + WISE+SDSS
Will rerun on corrected DVO database
Include Skyprobe data for bright KICs
High resolution spectroscopic follow-up at McDonald
Probabilistic binary selection
STS field
Run on K2 fields?
TO-DO
CLOSE BINARIES IN SYNOPTIC SURVEYS
Objects have ≈50 observations in PS1
True binaries will be more elliptical in better seeing
Can 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
SUMMARY
Doubled the number of wide late M companions
82% increase in wide late L companions
Most successful survey for benchmark companions to date
PS1Kepler probing wide binary – planet connection
Synoptic surveys provide a wealth of data for discovering new multiple systems
COINCIDENT?
STABILITY
Deacon et al. ApJ revised