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What’s the Deal with Low-Mass Stars, Brown Dwarfs, and Planets?. Kelle Cruz American Museum of Natural History. People Care About Planets. Low-Mass Stars, BDs, & Jupiter. All about same size as Jupiter L dwarfs can be either a stellar or sub-stellar. - PowerPoint PPT Presentation
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What’s the Deal with Low-Mass Stars,
Brown Dwarfs, and Planets?
Kelle CruzKelle CruzAmerican Museum of Natural HistoryAmerican Museum of Natural History
People Care About Planets
Low-Mass Stars, BDs, & Jupiter
All about same size as JupiterAll about same size as Jupiter L dwarfs can be either a stellar or sub-stellar.L dwarfs can be either a stellar or sub-stellar. Both planets and brown dwarfs cool over time Both planets and brown dwarfs cool over time
Jupiter was a T dwarf in youthJupiter was a T dwarf in youth
Definition of Planet In the Solar In the Solar
System (low mass)System (low mass) SphericitySphericity Pluto DiameterPluto Diameter Only 9Only 9 Discard altogetherDiscard altogether
Terrestrials, Terrestrials, Jovians, etc.Jovians, etc.
Outside the Solar Outside the Solar System (high mass)System (high mass) Orbits another bodyOrbits another body Formed in circumstellar Formed in circumstellar
disk rather than grav. disk rather than grav. collapsecollapse
Difficult to observeDifficult to observe Deuterium Burning Deuterium Burning
13 M13 MJupiterJupiter cutoff cutoff
Kuiper Belt Objects
Xena (2003 UB313)Xena (2003 UB313) LargerLarger than Pluto (10 than Pluto (10thth Planet?) Planet?) Has a moonHas a moon
2003 EL612003 EL61 Has two moonsHas two moons
2005 FY9 2005 FY9 Both very bright and ¾ Both very bright and ¾
Pluto’s size.Pluto’s size.From Mike Brown’s website.
From Mike Brown’s website.
GQ Lup B Primary Primary
T Tauri (young Sun)T Tauri (young Sun) Secondary (“Planet”)Secondary (“Planet”)
Spectral type: M9-L4Spectral type: M9-L4 Mass: 1-42 MMass: 1-42 MJupiterJupiter
2M 1207B Primary: Primary:
young (8 Myr), activeyoung (8 Myr), active brown dwarf (M8)brown dwarf (M8)
Secondary: Secondary: 5 M5 MJupiter, Jupiter, L5-L9.5 L5-L9.5
Too wide and too Too wide and too massive to have massive to have formed in a formed in a circumstellar disk.circumstellar disk.
In ClosingWhat the heck is a planet?What the heck is a planet?
None of the proposed definitions take care of None of the proposed definitions take care of both mass ends at the same time.both mass ends at the same time.
Personally, I think time will tell but in the Personally, I think time will tell but in the meantime, enjoy the spectacle!meantime, enjoy the spectacle!
Provides a great way to engage the publicProvides a great way to engage the publicSignifies an exciting time in astronomy.Signifies an exciting time in astronomy.