Understanding Young Pre-Main Sequence Disks: Variability, Gaps, and Protoplanet Formation
This guide explores the characteristics and evolution of young pre-main sequence disks, focusing on variability, gaps, and the growth of protoplanets. It highlights the phenomena of "older" PMS disks, identifies transitional disks, and discusses the significance of debris disks which are replenished via collisions. Using observations from systems like TW Hya, we aim to understand the influence of disk structures on planet formation. This comprehensive review emphasizes the importance of studying these disks at various ages to unravel the complexities of planetary system evolution.
Understanding Young Pre-Main Sequence Disks: Variability, Gaps, and Protoplanet Formation
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Presentation Transcript
Disks - Variability, Gaps & Protoplanets • A Practical Guide
Young Pre-Main Sequence Disks “Older” PMS Disks - grain growth & settling Regenerated “Debris Disks” - replenished by collisions Zodiacal Light - Our Solar System Today
How do planetary systems form & evolve? Need to study the disk structures as a function of “age”.
visible infrared Idealized Disks high T low T Wien’s Law!
TW Hya - Calvet et al. 2002, ApJ, 568, 1008 BASS! inner disk wall outer disk
Meeus Groups I and II (Meeus et al. 2001, A&A, 365, 476
Dullemond 2002, A&A, 395, 853 Meeus Group I Meeus Group II Looks good, but wait just a minute.... Let’s look at some Meeus Group I objects more closely......
Maaskant et al. 2013 - arXiv 1305.3183v1 “Identifying gaps in flaring Herbig Ae/Be disks using spatiallyresolved mid-infrared imaging Are all group I disks transitional?” Text evolutionary scenario?
TW Hya Hughes et al. 2007, ApJ, 664, 536 Observations “Hole” Model No “Hole” Model
LkCa 15 H-band coronagraphic AO image
There IS NO “The Model” Inner Disk Variability
Interferometry Isella et al. 2006, A&A, 451, 951 Monnier et al. 2006, ApJ, 647, 444
Fringes in the JHK bands http://www.mpifr-bonn.mpg.de/div/ir-interferometry/
HD 163296 = MWC 275 right after outburst
Exoplanets “Hot Jupiters”? Who ordered those?!
Okay, where did all the “Hot Jupiters” come from? Cannot form inside the snow/frost line Formed further out & migrated A nice “little” (8 MB) of one example, by Phil Armitage, U Colorado
Also, planetary scattering (Nice model...) Bottom line: current locations of exoplanets may have little to do with where they formed. Late Heavy Bombardment but LHB disputed...
Inside the “gap” of SAO 206462 Spiral arm modeling - probably 2 planets NASA Press release UC student on the paper: Chelsea Werren
Sparse Aperture Mask (SAM) Interferometry Keck II - NIRC2 Camera, January 2012
