EChO - Exoplanet Characterisation Observatory, Proposed ESA M-class mission |
EChO - Exoplanet Characterisation Observatory, Proposed ESA M-class mission |
Feb 29 2012, 12:01 AM
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#1
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Newbie Group: Members Posts: 3 Joined: 2-October 09 From: Seattle, WA Member No.: 4961 |
ESA EChO home page
This proposed mission would rely on a 1.5 m telescope and a 0.4-16 µm spectrometer, with average resolution but exquisite photometric stability, to perform transmission spectroscopy of transiting exoplanets. It would also do time-resolved spectroscopy of stellar systems, allowing to determine reflection spectra of exoplanets as their phase varies as seen from earth. The latter would also allow, in some cases, to get coarse cartographic data and constrain atmospheric models. Oh, and potentially detect biosignature O3 on temperate super-earths around M-dwarf stars. It is one of four contenders for the M3 slot (2022 launch). I like how they get a significant part of Darwin's science output by trading spatial resolution (hard) for sensitivity and time resolution (easier). I don't know, I just find it amazing Science summary on the mission website Edit: Reflection, not emission. The temperature difference between day and night would probably not be significant enough for that. |
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Feb 29 2012, 05:47 PM
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#2
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Member Group: Members Posts: 293 Joined: 29-August 06 From: Columbia, MD Member No.: 1083 |
Sounds like a great mission. My only caveat is that with a lower bound of ~1.5 Earth-radii in the habitable zone, a lot of the planets they can characterize will probably be better classfied as sub-Neptunes (i.e., not primarily rocky).
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Feb 29 2012, 10:21 PM
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#3
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Newbie Group: Members Posts: 3 Joined: 2-October 09 From: Seattle, WA Member No.: 4961 |
My only caveat is that with a lower bound of ~1.5 Earth-radii in the habitable zone, a lot of the planets they can characterize will probably be better classfied as sub-Neptunes (i.e., not primarily rocky). That would stille be valuable science. Moreover, planets such as Gliese 581d might be within its reach (not transiting, so reflection only. Not sure if it's possible, trying to find out...). And once the technique is perfected, getting better sensitivity only requires a bigger telescope (read: light bucket). No need to formation-fly spacecraft with nanometer precision. |
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