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How to directly image a habitable planet around alpha centauri with a 30-45 cm space telescope
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Belikov, Ruslan Bendek, Eduardo Males, Jared Thomas, Sandrine |
| Copyright Year | 2015 |
| Description | Several mission concepts are being studied to directly image planets around nearby stars. It is commonly thought that directly imaging a potentially habitable exoplanet around a Sun-like star requires space telescopes with apertures of at least 1m. A notable exception to this is Alpha Centauri (A and B), which is an extreme outlier among FGKM stars in terms of apparent habitable zone size: the habitable zones are approximately 3x wider in apparent size than around any other FGKM star. This enables a approximately 30-45cm visible light space telescope equipped with a modern high performance coronagraph or star shade to resolve the habitable zone at high contrast and directly image any potentially habitable planet that may exist in the system. The raw contrast requirements for such an instrument can be relaxed to 1e-8 if the mission spends 2 years collecting tens of thousands of images on the same target, enabling a factor of 500-1000 speckle suppression in post processing using a new technique called Orbital Difference Imaging (ODI). The raw light leak from both stars is controllable with a special wave front control algorithm known as Multi-Star Wave front Control (MSWC), which independently suppresses diffraction and aberrations from both stars using independent modes on the deformable mirror. This paper will present an analysis of the challenges involved with direct imaging of Alpha Centauri with a small telescope and how the above technologies are used together to solve them. We also show an example of a small coronagraphic mission concepts to take advantage of this opportunity called "ACESat: Alpha Centauri Exoplanet Satellite" submitted to NASA's small Explorer (SMEX) program in December of 2014. |
| File Size | 74798 |
| Page Count | 1 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20160001253 |
| Archival Resource Key | ark:/13960/t6wx2d52r |
| Language | English |
| Publisher Date | 2015-07-13 |
| Access Restriction | Open |
| Subject Keyword | Exoplanets High Con Coronagraph Extrasolar Planets Imaging Techniques Spaceborne Telescopes Wave Fronts Centaurus Constellation Habitability Algorithms Deformable Mirrors Diffraction Telescopes Mission Planning Aberration Coronagraphs Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
