Life in the Universe
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Life in the Universe I. astronomy Páll Jakobsson ([email protected]) 8 January 2013 “Somewhere, something incredible is waiting to be known.” Carl Sagan (1934-1996)
description
Life in the Universe. “Somewhere , something incredible is waiting to be known.” Carl Sagan (1934-1996). I. astronomy. Páll Jakobsson ([email protected]). 8 January 2013. The Exoplanet Next Door. Tau Ceti : A quintet of Exoplanets. 2-6 times Earth masses. 14. - PowerPoint PPT Presentation
Transcript of Life in the Universe
Life in the UniverseI. astronomy
Páll Jakobsson([email protected])
8 January 2013
“Somewhere, something incredible is waiting to be known.”Carl Sagan (1934-1996)
The Exoplanet Next Door
Tau Ceti: A quintet of Exoplanets
2-6 times Earth masses
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eXtreme Deep Field (XDF)An exposure
time of 2 million
seconds!
5,500 galaxies
A small fraction of the angular diameter of
the full Moon
Hubble XDF (zoom-in)
Hubble XDF (zoom-out)
Looking Back into Time with the XDF
Known Exoplanets
• 1992: a few are discovered around a neutron star!• 1995: the first around Sun-like star (indirect measurement).• January 2013: 854 (http://exoplanet.eu):
1) Radial velocity + astrometry: 498 (386 planetary systems)2) Transits: 291 (236 planetary systems)3) Microlensing: 16 (15 planetary systems)4) Imaging: 32 (28 planetary systems)
1), 2) and 3) are indirect measurements.
White dwarves and neutron stars
