Direct imaging of planetary systems with a ground-based radio telescope array

1994 ◽  
Vol 212 (1-2) ◽  
pp. 391-394 ◽  
Author(s):  
Dayton L. Jones
Keyword(s):  
Radio Telescope ◽  
Planetary Systems ◽  
Direct Imaging ◽  
Telescope Array

scholarly journals A Novel Technique for Wide-Field Polarimetry with a Radio Telescope Array

2006 ◽  
Vol 131 (1) ◽  
pp. 648-653 ◽  
Author(s):  
D. McConnell ◽  
E. Carretti ◽  
R. Subrahmanyan
Keyword(s):  
Radio Telescope ◽  
Wide Field ◽  
Telescope Array ◽  
Novel Technique

Electroforming In Space And Ground Telescopes

2020 ◽  
Author(s):  
Valsecchi Giuseppe
Keyword(s):  
Radio Telescope ◽  
Grazing Incidence ◽  
Space Telescopes ◽  
Telescope Array ◽  
X Ray ◽  
Electroforming Process ◽  
Space Agency ◽  
Thin Nickel ◽  
Grazing Incidence Optics ◽  
Italian Space Agency

In the last 25 years, electroforming process has been extensively optimized to produce grazing incidence optics for the X-ray space telescopes, enabling the renown observatories Beppo-SAX for the Italian Space Agency, SWIFT for NASA, XMM Newton for ESA, eROSITA for MPE. These optics are made of thin Nickel mirrors that are grown by electroforming process in an electrolytic bath on a Gold coated mandrel.Electroforming has also been adopted for production of large reflector panels for sub-millimeter radio telescope applications. Between 2006 and 2016, 3000 mirror panels for 25 antennas of the ALMA radio-telescope array of ESO and 1600 mirror panels for the 50-m diameter Large Millimeter Telescope (LMT) “Alfonso Serrano” of INAOE were designed, produced and tested.

Building a decametric radio telescope array

2019 ◽  
Vol 14 (08) ◽  
pp. P08022-P08022
Author(s):  
A. Alhameed ◽  
M. Abdelsalam ◽  
D. Nouichi ◽  
I. Fernini ◽  
H. Al Naimiy ◽  
...  
Keyword(s):  
Radio Telescope ◽  
Telescope Array

scholarly journals Fly-by encounters between two planetary systems I: Solar system analogues

2019 ◽  
Vol 488 (1) ◽  
pp. 1366-1376 ◽  
Author(s):  
Daohai Li ◽  
Alexander J Mustill ◽  
Melvyn B Davies
Keyword(s):  
Solar System ◽  
Planetary System ◽  
Planetary Systems ◽  
Open Clusters ◽  
Giant Planets ◽  
Direct Imaging ◽  
Solar Mass ◽  
Close Encounters ◽  
Large Numbers

ABSTRACTStars formed in clusters can encounter other stars at close distances. In typical open clusters in the Solar neighbourhood containing hundreds or thousands of member stars, 10–20 per cent of Solar-mass member stars are expected to encounter another star at distances closer than 100 au. These close encounters strongly perturb the planetary systems, directly causing ejection of planets or their capture by the intruding star, as well as exciting the orbits. Using extensive N-body simulations, we study such fly-by encounters between two Solar system analogues, each with four giant planets from Jupiter to Neptune. We quantify the rates of loss and capture immediately after the encounter, e.g. the Neptune analogue is lost in one in four encounters within 100 au, and captured by the flying-by star in 1 in 12 encounters. We then perform long-term (up to 1 Gyr) simulations investigating the ensuing post-encounter evolution. We show that large numbers of planets are removed from systems due to planet–planet interactions and that captured planets further enhance the system instability. While encounters can initially leave a planetary system containing more planets by inserting additional ones, the long-term instability causes a net reduction in planet number. A captured planet ends up on a retrograde orbit in half of the runs in which it survives for 1Gyr; also, a planet bound to its original host star but flipped during the encounter may survive. Thus, encounters between planetary systems are a channel to create counter-rotating planets, This would happen in around 1 per cent of systems, and such planets are potentially detectable through astrometry or direct imaging.

8. Moons in other planetary systems

2015 ◽  
pp. 137-139
Author(s):  
David A. Rothery
Keyword(s):  
Solar System ◽  
Hydrothermal Vents ◽  
Planetary Systems ◽  
Direct Imaging ◽  
Microbial Life ◽  
Good Place ◽  
The Galaxy ◽  
Made In

The first definite discovery of a planet around another star—an ‘exoplanet’—was made in 1995. We now know of more than 1,000 stars with exoplanets. In our Solar System, moons are considerably more numerous than planets, so it would be surprising if exomoons did not outnumber exoplanets. Only a few exceptional exoplanets have been seen by direct imaging and any exomoons are presently well below the visibility threshold. ‘Moons in other planetary systems: exomoons’ considers why exomoons matter. If hydrothermal vents on ocean floors really are a good place for life to begin, then icy exomoons with internal oceans throughout the galaxy could host microbial life.

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