Debris Disks in Multiplanet Systems: Are Our Inferences Compromised by Unseen Planets?

被引:7
作者
Dong, Jiayin [1 ,2 ]
Dawson, Rebekah I. [1 ,2 ]
Shannon, Andrew [1 ,2 ,3 ]
Morrison, Sarah [1 ,2 ,4 ]
机构
[1] Penn State Univ, Dept Astron & Astrophys, 525 Davey Lab, University Pk, PA 16802 USA
[2] Penn State Univ, Ctr Exoplanets & Habitable Worlds, 525 Davey Lab, University Pk, PA 16802 USA
[3] Univ Paris, Sorbonne Univ, CNRS, LESIA,Observ Paris,Univ PSL, 5 Pl Jules Janssen, F-92195 Meudon, France
[4] Missouri State Univ, Dept Phys Astron & Mat Sci, Springfield, MO 65897 USA
基金
欧洲研究理事会;
关键词
Debris disks; Circumstellar matter; BETA-PICTORIS; CIRCUMSTELLAR DISK; DUST; ASYMMETRIES; EVOLUTION; RESONANCE; MASS; PLANETESIMALS; CAPTURE; ORIGIN;
D O I
10.3847/1538-4357/ab64f7
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Resolved debris disk features (e.g., warps, offsets, edges and gaps, azimuthal asymmetries, radially thickened rings, scale heights) contain valuable information about the underlying planetary systems, such as the posited planet's mass, semimajor axis, and other orbital parameters. Most existing models assume a single planet is sculpting the disk feature, but recent observations of mature planetary systems (e.g., by radial velocity surveys or Kepler) have revealed that many planets reside in multiplanet systems. Here we investigate if/how planet properties inferred from single-planet models are compromised when multiple planets reside in the system. For each disk feature, we build a two-planet model that includes a planet b with fixed parameters and a planet c with a full range of possible parameters. We investigate these two-planet systems and summarize the configurations for which assuming a single planet (i.e., planet b) leads to significantly flawed inferences of that planet's properties. We find that although disk features are usually primarily dominated by a single planet, when using single-planet models, we are at risk of misinterpreting planet properties by orders of magnitude in extreme cases. Specifically, we are at high risk of misinterpreting planet properties from disk warps; at moderate risk from disk edges and gaps, radially thickened rings, and scale height features; and at low risk from host star-disk center offsets and azimuthal asymmetries. We summarize situations where we can infer the need to use a multiplanet model instead of a single-planet one from disk morphology dissimilarities.
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页数:19
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