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Journal Article

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

MPS-Authors

Biller,  Beth A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Vos,  Johanna
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Buenzli,  Esther
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Allers,  Katelyn
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bonnefoy,  Mickaël
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Charnay,  Benjamin
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bézard,  Bruno
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Allard,  France
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Homeier,  Derek
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bonavita,  Mariangela
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Brandner,  Wolfgang
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Crossfield,  Ian
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Dupuy,  Trent
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Henning,  Thomas
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kopytova,  Taisiya
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Liu,  Michael C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Manjavacas,  Elena
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Schlieder,  Joshua
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2018AJ....155...95B
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Citation

Biller, B. A., Vos, J., Buenzli, E., Allers, K., Bonnefoy, M., Charnay, B., et al. (2018). Simultaneous Multiwavelength Variability Characterization of the Free-floating Planetary-mass Object PSO J318.5-22. The Astronomical Journal, 155.


Cite as: https://hdl.handle.net/21.11116/0000-0005-CEDA-E
Abstract
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 v\sin i for this object, we find an inclination of 56.°2 ± 8.°1. We measure peak-to-trough variability amplitudes of 3.4% ± 0.1% for Spitzer Channel 2 and 4.4%-5.8% (typical 68% confidence errors of ̃0.3%) in the near-IR bands (1.07-1.67 μm) covered by the WFC3 G141 prism—the mid-IR variability amplitude for PSO J318.5-22 is one of the highest variability amplitudes measured in the mid-IR for any brown dwarf or planetary-mass object. Additionally, we detect phase offsets ranging from 200° to 210° (typical error of ̃4°) between synthesized near-IR light curves and the Spitzer mid-IR light curve, likely indicating depth-dependent longitudinal atmospheric structure in this atmosphere. The detection of similar variability amplitudes in wide spectral bands relative to absorption features suggests that the driver of the variability may be inhomogeneous clouds (perhaps a patchy haze layer over thick clouds), as opposed to hot spots or compositional inhomogeneities at the top-of-atmosphere level.