Simultaneous Multiwavelength Variability Characterization of the Free-floating Planetary-mass Object PSO J318.5−22

@article{Biller2017SimultaneousMV,
  title={Simultaneous Multiwavelength Variability Characterization of the Free-floating Planetary-mass Object PSO J318.5−22},
  author={Beth A. Biller and Johanna M. Vos and Esther Buenzli and Katelyn N. Allers and Micka{\"e}l Bonnefoy and Benjamin Charnay and Bruno B'ezard and France Allard and Derek Homeier and Mariangela Bonavita and Wolfgang Brandner and Ian J. M. Crossfield and Trent J. Dupuy and Th. Henning and Taisiya G. Kopytova and Michael C. Liu and Elena Manjavacas and Joshua E. Schlieder},
  journal={The Astronomical Journal},
  year={2017},
  volume={155}
}
We present simultaneous Hubble Space Telescope (HST) WFC3+Spitzer IRAC variability monitoring for the highly variable young (∼20 Myr) planetary-mass object PSO J318.5−22. Our simultaneous HST + Spitzer observations covered approximately two rotation periods with Spitzer and most of a rotation period with the HST. We derive a period of 8.6 ± 0.1 hr from the Spitzer light curve. Combining this period with the measured for this object, we find an inclination of 56.°2 ± 8.°1. We measure peak-to… 

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