[HN Gopher] High Contrast Imaging of the Exoplanet HIP 65426 b f...
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       High Contrast Imaging of the Exoplanet HIP 65426 b from 2-16 mm
        
       Author : bookofjoe
       Score  : 40 points
       Date   : 2022-09-01 19:02 UTC (3 hours ago)
        
 (HTM) web link (arxiv.org)
 (TXT) w3m dump (arxiv.org)
        
       | bookofjoe wrote:
       | From the submission page:
       | 
       | >Comments: 35 pages, 16 figures, 3 tables, 1 wonderful telescope;
       | Submitted to AAS Journals
        
       | nostromo wrote:
       | Direct link to the image: https://go.nature.com/3q56P5U
        
         | aaaaaaaaaaab wrote:
         | The white star is the exoplanet?
        
           | LeifCarrotson wrote:
           | No, the white star is the measured location of the system's
           | star, which has been subtracted from the image. The yellow-
           | orange blob of ~16 pixels below and to the left of the star
           | is the super-Jovian expolanet. There are more images in the
           | source paper with different spectral filters, the caption on
           | figure 8 describes the star:
           | 
           | https://i.imgur.com/KlgEVze.png
           | 
           | Take a look at this sequence:
           | 
           | https://i.imgur.com/STcNkIP.png
           | 
           | They started with the image at left, which represents a
           | combination of both the planet and the star. Clearly, the
           | star is so much brighter than the reflection of starlight off
           | the planet that it blows out the whole image. But the star is
           | pretty consistent, and definitely circular, so they could
           | take a reference image and a rotated image and erase all the
           | pixels that look like they expect the star to look. The
           | difference between a normal star and the image they actually
           | took is the planet-shaped hole left after subtracting one
           | from the other.
        
             | lxe wrote:
             | Thanks for the explanation! That is very interesting to see
             | how they pick out the planets out of the star's brightness.
        
           | klyrs wrote:
           | More pictures in the linked paper; the captions mention that
           | the position of the star is marked by the white star.
        
             | jrumbut wrote:
             | I only briefly examined the paper, but I felt that it did a
             | better than usual job explaining how they got to that
             | image.
        
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       (page generated 2022-09-01 23:00 UTC)