Evidence for a Circumplanetary Disk around Protoplanet PDS 70 b

Christiaens, Valentin and Cantalloube, Faustine and Casassus, Simon and Price, Daniel J. and Absil, Olivier and Pinte, Christophe and Girard, Julien and Montesinos, Matias (2019) Evidence for a Circumplanetary Disk around Protoplanet PDS 70 b. The Astrophysical Journal, 877 (2). L33. ISSN 2041-8213

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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 MJ 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 $\mathrm{log}(g)\sim 4.0$, radius ∼1.6RJ, mass ∼10MJ, and possible thick clouds. Models with variable extinction lead to slightly worse fits. However, the amplitude (ΔAV ≳ 3 mag) and timescale of variation (≲years) required for the extinction would also suggest circumplanetary material.

Item Type: Article
Subjects: Asian Repository > General Subject > Physics and Astronomy
0 Subject > Physics and Astronomy
Depositing User: Managing Editor
Date Deposited: 06 Jun 2023 09:49
Last Modified: 06 Jun 2023 09:49
URI: http://eprints.asianrepository.com/id/eprint/5009

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