[HN Gopher] Accretion disk images guide theories on planet forma...
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       Accretion disk images guide theories on planet formation
        
       Author : MeteorMarc
       Score  : 53 points
       Date   : 2021-11-14 08:49 UTC (14 hours ago)
        
 (HTM) web link (www.quantamagazine.org)
 (TXT) w3m dump (www.quantamagazine.org)
        
       | MeteorMarc wrote:
       | More images of young stars with their accretion disk can be found
       | at: https://public.nrao.edu/news/2018-alma-survey-disks/
        
         | jjbinx007 wrote:
         | Those are absolutely breathtaking. I never thought I'd see
         | images like this with such clarity.
         | 
         | I just read they're the result of 66 dishes aimed at the sky.
         | Do they also use the Earth's position around the sun 6 months
         | apart, or are these images created with relatively short
         | observations?
        
           | icegreentea2 wrote:
           | Skimming through the pre-print
           | (https://arxiv.org/pdf/1812.04040.pdf), it doesn't look like
           | they're using the Earth's position along the orbit.
           | 
           | Looks like on the order of ~hour per target.
        
             | jjbinx007 wrote:
             | Thank you
        
           | tomr_stargazer wrote:
           | In interferometry [0], you need your telescope components to
           | be collecting data simultaneously so that you can interfere
           | their collected light together - so the maximum possible
           | separation is about the diameter of the Earth. (The VLBA [1]
           | and the EHT [2] make use of most of this potential.)
           | 
           | There have been proposals to extend this maximum baseline by
           | having space-borne interferometers (perhaps orbiting the
           | Sun), but practically, they are a few decades away at best.
           | [3]
           | 
           | [0] https://en.wikipedia.org/wiki/Astronomical_interferometer
           | 
           | [1] https://en.wikipedia.org/wiki/Very_Long_Baseline_Array
           | 
           | [2] https://en.wikipedia.org/wiki/Event_Horizon_Telescope
           | 
           | [3] https://www.noao.edu/meetings/interferometry/workshop-
           | files/...
        
             | jjbinx007 wrote:
             | Ah yes. I confused two different ideas. Thanks for the
             | links
        
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       (page generated 2021-11-14 23:01 UTC)