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Wide Binary Science Using Pan-STARRS1

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.

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Wide Binary Science Using Pan-STARRS1

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  1. 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)

  2. Breaking The Degeneracy Saumon & Marley models

  3. PSO 318-22:The “lonely Planet” 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. Liu+ 2013

  4. PS1 + 2MASS search finds substellar members of young moving groups Increasing Age Flux + Constant  40 MJup Wavelength (μm) Kimberly Aller (IfA)

  5. Benchmark systems • Wide companions to main sequence stars • Age, distance and metallicity determined from primary • Break degeneracy • Formation mechanism for wide binaries uncertain 2MASS J

  6. Good God Y’all! BenchmarksWhat are they good for? Huh! Starr et al. 1969 • 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)

  7. Selecting candidates • Input primary list • High mHipparcos stars • M 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/SpeX • High priority: zp1-yp1 > 0.8 • Back-up: J<15 • Preferentially followed up close (<5 arcmins) companions

  8. Discovery Summary 58 new companions 31 known 24 new Ls 23 late Ms Deacon et al. ApJ revised

  9. Open: total known Solid: Our contribution Doubled 82% more Deacon et al. ApJ revised

  10. New Atmospheric models reproduce Temperatures well Deacon et al 2012

  11. Higher order multiplicity • 8 of our objects are tertiary components • One companion showed usual water band absorption • Spectra suggest L1 + T3 Keck NIRC2 LGS/AO 0.12” binary >300 yr period See Burgasser (2007), Dupuy & Liu (2012) for methodology

  12. Wide Companions and exoplanets Kaib et al. 2013

  13. PS1 Kepler Standard Project Goals Probe effect of wide binarity on planet occurrence Wide binaries as tests of gyrochronology Testing axial alignment of binaries Powerful legacy dataset to characteriseKepler planet hosts • Full proper motion survey of the Kepler field using all available data

  14. Astrometric accuracy

  15. Problem areas Reduced Proper Motion Hr = r +5 + 5log10m Hr= Mr + 5log10vt + const

  16. 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

  17. Close binaries in Synoptic Surveys 0.4” binary • 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 First used on PTF data by Terziev et al. (2012) Blue histogram: objects not resolved as binaries with AO

  18. 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

  19. Coincident?

  20. Stability Deacon et al. ApJ revised

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