Projects per year
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 , radius ∼1.6R J, mass ∼10M J, and possible thick clouds. Models with variable extinction lead to slightly worse fits. However, the amplitude (ΔA V ≳ 3 mag) and timescale of variation (≲years) required for the extinction would also suggest circumplanetary material.
Original language | English |
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Article number | L33 |
Number of pages | 6 |
Journal | The Astrophysical Journal Letters |
Volume | 877 |
Issue number | 2 |
DOIs | |
Publication status | Published - 1 Jun 2019 |
Keywords
- disk interactions
- plane
- planets and satellites: formation
- protoplanetary disks
- stars: individual
Projects
- 3 Finished
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Gaps, rings and holes in protoplanetary discs - signs of newborn planets?
Price, D. (Primary Chief Investigator (PCI)), Lodato, G. (Partner Investigator (PI)) & Pinte, C. (Chief Investigator (CI))
30/05/18 → 31/12/22
Project: Research
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Formation and evolution of planetary systems
Pinte, C. (Primary Chief Investigator (PCI))
1/10/17 → 12/04/23
Project: Research
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The birth of stars and planets
Price, D. (Primary Chief Investigator (PCI))
Australian Research Council (ARC)
1/01/14 → 31/12/20
Project: Research