Finding Habitable Exoplanets - Olivier Guyon (SETI Talks
Μετάδοση με ζωντανή ροή στις 6 Αυγ 2013
SETI Talks archive: http://seti.org/talks
Speaker: Olivier Guyon, University of Arizona and Suburu Telescope, HI
Abstract:
Directly
imaging exoplanets is both scientifically exciting but notoriously
challenging. Scientifically, obtaining images of rocky planets in the
habitable zones of stars is key to finding if and how life developed
outside the solar system. Large-scale biological activity can modify the
chemical composition of the planet's atmosphere and its surface
properties, both of which can be studied by spectrophotometry. The
measurement is however extremely challenging, as the planet light is
considerably fainter that the host star's light, and the angular
separation between the two objects is about 0.1 arcsecond or less.
Conventional
imaging systems cannot overcome the high star to planet contrast, and
unusual optics are required for imaging exoplanets. Dr. Guyon will
describe such systems (coronagraphs) and the upcoming scientific
opportunities associated with their deployment on ground-based
telescopes and in space. He will show that ground-based extremely large
telescopes (ELTs) will have the ability to directly image and
spectroscopically characterize rocky planets in the habitable zones of
nearby M-type stars, thus providing scientific evidence for (or against)
the presence of life outside our solar system. Space telescopes
operating in optical light are well suited to target Earth-like planets
around Sun-like stars.
Dr. Guyon will also describe the PANOPTES
(Panoptic Astronomical Networked OPtical observatory for Transiting
Exoplanet Survey) project, aimed at supporting a world-wide network of
small robotic digital cameras built by citizen scientists and schools to
identify a large number of transiting exoplanets.
Speaker: Olivier Guyon, University of Arizona and Suburu Telescope, HI
Abstract:
Directly
imaging exoplanets is both scientifically exciting but notoriously
challenging. Scientifically, obtaining images of rocky planets in the
habitable zones of stars is key to finding if and how life developed
outside the solar system. Large-scale biological activity can modify the
chemical composition of the planet's atmosphere and its surface
properties, both of which can be studied by spectrophotometry. The
measurement is however extremely challenging, as the planet light is
considerably fainter that the host star's light, and the angular
separation between the two objects is about 0.1 arcsecond or less.
Conventional
imaging systems cannot overcome the high star to planet contrast, and
unusual optics are required for imaging exoplanets. Dr. Guyon will
describe such systems (coronagraphs) and the upcoming scientific
opportunities associated with their deployment on ground-based
telescopes and in space. He will show that ground-based extremely large
telescopes (ELTs) will have the ability to directly image and
spectroscopically characterize rocky planets in the habitable zones of
nearby M-type stars, thus providing scientific evidence for (or against)
the presence of life outside our solar system. Space telescopes
operating in optical light are well suited to target Earth-like planets
around Sun-like stars.
Dr. Guyon will also describe the PANOPTES
(Panoptic Astronomical Networked OPtical observatory for Transiting
Exoplanet Survey) project, aimed at supporting a world-wide network of
small robotic digital cameras built by citizen scientists and schools to
identify a large number of transiting exoplanets.
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