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Journal Article

Evidence for a Circumplanetary Disk around Protoplanet PDS 70 b

MPS-Authors

Christiaens,  Valentin
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Cantalloube,  Faustine
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Casassus,  Simon
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Price,  Daniel J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Absil,  Olivier
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pinte,  Christophe
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Girard,  Julien
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Montesinos,  Matias
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2019ApJ...877L..33C
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Citation

Christiaens, V., Cantalloube, F., Casassus, S., Price, D. J., Absil, O., Pinte, C., et al. (2019). Evidence for a Circumplanetary Disk around Protoplanet PDS 70 b. The Astrophysical Journal, 877.


Cite as: https://hdl.handle.net/21.11116/0000-0005-D3E1-E
Abstract
We present the first observational evidence for a circumplanetary disk (CPD) around the protoplanet PDS 70 b, based on a new spectrum in the K-band acquired with Very Large Telescope/SINFONI. We tested three hypotheses to explain the spectrum: atmospheric emission from the planet with either (1) a single value of extinction, (2) a variable extinction, and (3) a combined atmospheric and CPD model. Goodness-of-fit indicators favor the third option, suggesting that circumplanetary material contributes excess thermal emission—most prominent at λ ≳ 2.3 μm. Inferred accretion rates (∼10−7.8-10−7.3 M J yr−1) are compatible with observational constraints based on the Hα and Brγ lines. For the planet, we derive an effective temperature of 1500-1600 K, surface gravity {log}(g)∼ 4.0, radius ∼1.6R J , mass ∼10M J , and possible thick clouds. Models with variable extinction lead to slightly worse fits. However, the amplitude (∆A V ≳ 3 mag) and timescale of variation (≲years) required for the extinction would also suggest circumplanetary material.