Download - Tracing the Lifecycle of Planetary Systems around stars (slightly) more massive than the Sun
Tracing the Lifecycle of Planetary Systems around stars (slightly) more massive than the Sun
John Debes
Hubble Science Briefing
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Unchanging Heavens?
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How do we study populations of stars?
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ESO
NASA/HST
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We are but Mayflies of the Milky Way…
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Stellar and Planetary Birth
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Ardila et al., 2007
HD 100546
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HD 100546
Ardila et al., 2007
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ALMA (ESO/NAOJ/NRAO)/Nienke van der Marel
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CO, H2O, dust
Disk structures, planets
Dust segregation
E J S N
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Planetary Adolescence
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NASA’s IRAS discovers the “Fabulous Four”, and launches the characterization of dusty stars
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Three of the Fabulous Four
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All A-type stars, two known to host planetary mass objects
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β Pictoris
10/2/14Smith & Terrile (1984)
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β Pictoris
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β Pictoris b
10/2/14Nielsen et al. (2014) Snellen et al. (2014)
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β Pictoris b—transiting planet?
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Lecavelier des Etangs et al. (1997)
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Planet Crashes at HD 172555
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Lisse et al. (2009)
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HR 4796A—Mysterious Dust
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Wahhaj et al. (2014)
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Debes et al. (2008)
Scatt
erin
g Effi
cien
cy
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HR 8799
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HR 8799
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Middle Age Planets
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??
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ESO
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‘Retired’ planetary systems
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Bonsor et al. (2013)
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‘Retired’ planetary systems
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The ultimate retirement
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A planetary system’s swan song
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Stel
lar B
right
ness
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White dwarf dust looks like asteroids
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Xu et al. (2014)
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Take Home Points
• Dust traces the lives of planets from birth until death
• Stars more massive than the sun have been a goldmine of information about the diverse and amazing process of planet formation
• While we know much, the process of planet formation is still quite mysterious and surprising—leading us into exciting territory!
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