Download - Observational Signatures of Planets Around the Black Hole at theMilky Way Center ( SgrA *)
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Observational Signatures of Planets Around the Black Hole at theMilky Way Center (SgrA*)
• Proto-Planetary Disk as the Source of the G2 Gas Cloud
• Hypervelocity planets and planets around hypervelocity stars
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Stellar Orbits Around SgrA*
Ghez et al. 2008; Genzel et al. 2008
MBH = (4:5æ0:4) â 106M ì
dGC =8:4æ0:4kpc (BH at rest in GC)
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Gillessen et al., Nature (2012)
*Ionized cloud, ~3x10^5 cm^{-3}, ~100AU, electrons at 10^4K, dust at 550K, 3 Earth masses
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Latest Data
Gillessen et al. , submitted (2012)
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Br-gamma slit
SgrA*
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Br-gamma
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Burkert et al. (2012)
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Schartmann et al. (2012)
“Pressure-Confined Cloud” Model
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Problem: why is the head moving on a ballistic orbit with no evidence for
ambient ram-pressure?
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Tidal Disruption of a Proto-Planetary Disk Around a Low-Mass Star
Murray-Clay & Loeb (2012)
*Planets form near SgrA*
*Flags low-mass stars
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Physical Parameters• Low-mass star, born in circum-nuclear ring at
~0.04pc, and scattered into orbit a few Myrs ago.
Original Current
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• Low probability for scattering if this represents the first passage, but high probability for multiple passages in which the gas cloud is rejuvinated every pericenter passage (from ~1AU).
• Ionizing background from surrounding O-stars generates a ~10 km/s outflow from tidally-truncated disk of 1-10AU around M-dwarf (too faint to be observable).
• Photoevaporation yields a wind mass loss rate:
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ionized
observed now
Br-pericenter
HI
observed
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Hypervelocity Planets from Tidal Disruption of Stellar Binaries by SgrA*
Ginsburg, Loeb, & Wegner (2012)
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Possible Outcome: Free Hypervelocity Planets
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2 planets0.02 AU
4 planets0.02 AU 0.03AU
Probabilities of Outcomes
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Transits of Hypervelocity Stars
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Tidal Flares from Disrupted Planets or Asteroids
Waste dump: source of clean energy for galacto-centeric civilizations
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Tidal Distruption of a Bound Object (e=0.8,beta=5)
Hayasaki, Stone, and Loeb 2012
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Summary:
1. Evaporation of proto-planetary disks may flag low-mass stars at the Galactic Center.
2. Close-in planets around hypervelocity stars may cause detectable transit signatures.
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Initial Ring Results in Two Bright Spots
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A Relativistic Jet from a TDE: Swift 164449.3+573451 (GRB110328A)
*Synchrotron and X-ray peaks are emitted from different regions; bulk Lorentz factor~2-3
Bloom et al. 2011 Zauderer et al. 2011