matteo brogi, henriette schwarz, emanuele di gloria, jayne ... · remco de kok, simon albrecht,...
TRANSCRIPT
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Matteo Brogi, Henriette Schwarz, Emanuele di Gloria, Jayne Birkby, Anna-Lea Lesage, Julien Spronck, Remco de Kok, Simon Albrecht, Ernst de Mooij, Remko Stuik, Gilles Otten, Christoph Keller, Jens Hoeijmakers, Andrew Ridden-Harper, Sebastiaan Haffert, Geert-Jan Talens
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1992 Pulsar planets
1995 51 Peg b
2000 planet transit
2002 Atmosphere detection2004 planet thermal emission
2004 Exo-Neptune2008 thermal map
2010 CO, winds
2014 Planet spin2013 1000 exoplanets
2018-2020 Atmospheres of Neptunes
2020-2025 Atmospheres of Earths
2025-2030 Biomarkers
2012 Water vapour
2015 Exo-Earth
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Super-rotating, CO2 basedOpaque sulfuric acid clouds
Partially clear,N2-basedBiotic oxygen
Tenuous CO2Varying trace-amount of methane
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“Trying to comprehend Tree of Life using three animals”
Exoplanet studies shows that diversity is much larger:oHot Jupiterso super-Earth & mini-NeptunesoGas giants at large orbital distances (>100 AU)
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You visit You dig and drill in situ measurements
Understanding planets• Body’s mass, size• Composition of atmosphere, surface• Rotation period, oblateness• Gravity field, magnetic field, seismic data• Sample return• Laboratory data behaviour of materials• Quantum mechanical calculations
Possible
hard
Very difficult?
Impossible!
Exop
lane
ts
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O2
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Charbonneau et al. 2000
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State-of-the-art: NASA Kepler
Upcoming missions: NASA TESS (2018); ESA PLATO (2024)
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Marois et al.
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1 in 10 stars has a Jupiter-mass planet1 in 3 stars has a Neptune-mass planetMost of the stars have an Earth-mass planet
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transmission spectroscopy
eclipsespectroscopy
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HD 189733b - Pont et al. 2012
Sodium
Cloud deck?
Scale Height,
Contrast,
HHJ = ~500 km, Fc = 10-3…-4
Deming et al. 2013
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Snellen et al. 2008; De Mooij & Snellen 2009; Snellen et al. Nature 2009; Albrecht et al. Nature 2009; Snellen et al. Nature 2010; Brogi et al. Nature, 2012,
Snellen et al. Nature 2014
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European Southern ObservatoryVery Large Telescope (4x8m telescopes)
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• At R=100,000 molecular bands are resolved in tens of individual lines
• Strong doppler effects due orbital motion of the planet (up to >150 km/s).
• Moving planet lines can be distinguished from stationary telluric + stellar lines
Toy model
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• Reveals planet orbital velocity• Solves for masses of both planet and star (model independent)• Evidence for blueshift (high altitude winds?)
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Brogi et al., Nature 2012
First detection of non-transitingplanet inclination, mass
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Brogi et al. 2012 Brogi et al. 2013 De Kok et al. 2013
Birkby et al. 2013
CRIRES@VLT Upgrade (2017) 20x larger wavelength coverageCO, H2O, CH4, NH3, H3+,…..
VLT ESPRESSO (OpticalTiO, VO, FeH,…..)
HD189733b - Water!
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Beta Pictoris b
Mass = 11 (+-5) MjupRadius ~ 1.65 RjupOrbit: 17-20 years
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25+-3 km/s
Length of Day on Beta Pictoris b ~8 hours
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How do planets acquire spin?
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2024 39m diameter mirror
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Showman et al. 2012
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Remco de Kok
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SNR for ELT in 1 transit Brightest expected systems
Snellen et al. 2013
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METIS @ E-ELT, Snellen et al.2015.
Rocky planet in the habitable zone of Alpha Centaurus A
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E-ELT (Strehl=0.5), 10 hours, R=100,000, Δλ = 600 – 900 nmEarth-spectrum, T=280 K, 2 R_earth.
star planet
Planet spectrum is a copy of that of the star, but velocity shifted
Snellen et al. In prep
Contrast Map SNR Map
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SUMMARY