Active mirrors for future space telescopes

2018 ◽  
Author(s):  
Todd Gaier ◽  
Raef Mikhail ◽  
Jeff Cavaco ◽  
John Vayda ◽  
John Steeves ◽  
...  
Keyword(s):  
Space Telescopes ◽  
Future Space ◽  
Active Mirrors

scholarly journals When did Population III star formation end?

2020 ◽  
Vol 497 (3) ◽  
pp. 2839-2854 ◽  
Author(s):  
Boyuan Liu ◽  
Volker Bromm
Keyword(s):  
Star Formation ◽  
Direct Detection ◽  
Analytical Models ◽  
Space Telescopes ◽  
Detection Rates ◽  
Metal Free ◽  
Detection And Identification ◽  
Future Space ◽  
Study Population ◽  
Population Iii

ABSTRACT We construct a theoretical framework to study Population III (Pop III) star formation in the post-reionization epoch (z ≲ 6) by combining cosmological simulation data with semi-analytical models. We find that due to radiative feedback (i.e. Lyman–Werner and ionizing radiation) massive haloes ($M_{\rm halo}\gtrsim 10^{9}\ \rm M_{\odot }$) are the major (≳90 per cent) hosts for potential Pop III star formation at z ≲ 6, where dense pockets of metal-poor gas may survive to form Pop III stars, under inefficient mixing of metals released by supernovae. Metal mixing is the key process that determines not only when Pop III star formation ends, but also the total mass, MPopIII, of active Pop III stars per host halo, which is a crucial parameter for direct detection and identification of Pop III hosts. Both aspects are still uncertain due to our limited knowledge of metal mixing during structure formation. Current predictions range from early termination at the end of reionization (z ∼ 5) to continuous Pop III star formation extended to z = 0 at a non-negligible rate $\sim \!10^{-7}\ \rm M_{\odot }\ yr^{-1}\ Mpc^{-3}$, with $M_{\rm PopIII}\sim 10^{3}-10^{6}\ \rm M_{\odot }$. This leads to a broad range of redshift limits for direct detection of Pop III hosts, zPopIII ∼ 0.5–12.5, with detection rates $\lesssim 0.1-20\ \rm arcmin^{-2}$, for current and future space telescopes (e.g. HST, WFIRST, and JWST). Our model also predicts that the majority (≳90 per cent) of the cosmic volume is occupied by metal-free gas. Measuring the volume-filling fractions of this metal-free phase can constrain metal-mixing parameters and Pop III star formation.

scholarly journals Thin glass shells for active optics for future space telescopes

2019 ◽  
Vol 11 (4) ◽  
pp. 533-541
Author(s):  
G. Vecchi ◽  
S. Basso ◽  
M. Civitani ◽  
M. Ghigo ◽  
G. Pareschi ◽  
...  
Keyword(s):  
Space Telescopes ◽  
Thin Glass ◽  
Active Optics ◽  
Future Space

Development of a prototype active optics system for future space telescopes

2018 ◽  
Vol 57 (22) ◽  
pp. E101 ◽  
Author(s):  
Nicholas Devaney ◽  
Fiona Kenny ◽  
Alexander V. Goncharov ◽  
Matthias Goy ◽  
Claudia Reinlein
Keyword(s):  
Space Telescopes ◽  
Active Optics ◽  
Future Space

scholarly journals Characterizing Earth Analogs in Reflected Light: Atmospheric Retrieval Studies for Future Space Telescopes

2018 ◽  
Vol 155 (5) ◽  
pp. 200 ◽  
Author(s):  
Y. Katherina Feng ◽  
Tyler D. Robinson ◽  
Jonathan J. Fortney ◽  
Roxana E. Lupu ◽  
Mark S. Marley ◽  
...  
Keyword(s):  
Space Telescopes ◽  
Reflected Light ◽  
Future Space

Optical space telescope structures: The state of the art and future directions

2009 ◽  
Vol 113 (1148) ◽  
pp. 633-645 ◽  
Author(s):  
M. J. Santer ◽  
K. A. Seffen
Keyword(s):  
Structural Engineering ◽  
State Of The Art ◽  
Areal Density ◽  
Knowledge Gap ◽  
Space Telescopes ◽  
Future Directions ◽  
Space Telescope ◽  
Future Space ◽  
Structural Engineers ◽  
Telescope System

Abstract Future space telescopes will be required to have significantly greater aperture and lower areal density than is currently achievable. Gossamer spacecraft structures have been proposed as a means of achieving this, but the technologies are far from mature. A state-of-the-art review is timely and necessary as new structural paradigms are being considered for the next generation of space telescopes. There is, however, a knowledge gap between the structural engineering community and the additional fields involved in the complete telescope system, leading to the proposal of structures which are unlikely to be launched. It is hoped that, by providing a resource by which structural engineers are made aware of the wider issues in telescope design, this review will serve to overcome this knowledge gap to facilitate productive collaboration.

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