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<blockquote style="position: relative; padding-left: 55px;"><section><a href="https://astrodon.social/users/kellylepo/statuses/111064434505039470">Kelly Lepo (kellylepo@astrodon.social)'s status on Friday, 15-Sep-2023 02:19:13 JST</a><a href="https://astrodon.social/@kellylepo" title="kellylepo@astrodon.social"><img src="https://gnusocial.jp/avatar/28639-48-20221116180105.webp" width="48" height="48" alt="Kelly Lepo" style="position: absolute; left: 0; top: 0;">Kelly Lepo</a><div><a href="https://astrodon.social/@kellylepo/111063794910776974" rel="in-reply-to">in reply to</a></div></section><article><p>New observations of the debris desk around the star Beta Pictoris from Marshal Perrin. They see a new feature they are calling the "cat's tail" which may be dust being blow out of the system after a collision of two planetesimals.<br><a href="https://astrodon.social/tags/JWSTYearOne" rel="tag">#JWSTYearOne</a></p></article><footer><a rel="bookmark" href="https://gnusocial.jp/conversation/2052104#notice-4043193">In conversation</a><time datetime="2023-09-15T02:19:13+09:00" title="Friday, 15-Sep-2023 02:19:13 JST">about a year ago</time> <span>from <span><a href="https://astrodon.social/@kellylepo/111064434505039470" rel="external" title="Sent from astrodon.social via ActivityPub">astrodon.social</a></span></span><a href="https://astrodon.social/@kellylepo/111064434505039470">permalink</a><h4>Attachments</h4><ol><li><label><a rel="external" href="https://gnusocial.jp/attachment/1521061">The Cat’s Tail and the Fork 
MIRI F2300C deconvolved Image of a disk around a star. In the center is a black circle and lines, which are an instrumental artifact. The main disk is a thin, fuzzy yellow line. The "Fork" is a thin line below the disk that is at a slight angle. Text: "Extenstion of inclined inner disk. Also seen at shorter wavelengths, e.g. HST STIS, Apai et al. 2015."Above the disk is the "cat's tail" a curved line above the disk. Above this is an area of pink-ish clumps, labeled "Clumpy Nebulosity."</a></label><br><a href="https://cdn.masto.host/astrodonsocial/media_attachments/files/111/064/361/959/460/756/original/79b08203b11abfbe.png" rel="external">https://cdn.masto.host/astrodonsocial/media_attachments/files/111/064/361/959/460/756/original/79b08203b11abfbe.png</a></li><li><label><a rel="external" href="https://gnusocial.jp/attachment/1521062">Collisional debris originating from CO clump location can explain the Fork and the Cat’s Tail
Fork consistent with bound dust from the nearly edge-on secondary disk 
Cat’s Tail consistent with blowout grains; apparent inclination is a line-of-sight effect 
Required geometry consistent with main disk geometry and Beta Pic b’s orbit
Requires over-production of dust mostly near a specific value, Beta~ 0.8.
Two images: 
The first is the disk rendered in colors of yellow and red. Observations after subtraction of the main disk’s symmetric component. Again, there is a black instrumental artifact in the center, a bright horizontal disk, and the "cat's tail" curved line above the disk. The second is a model of the disk: A thin, slightly angled disk in similar colors, labeled "bound dust beta &lt;0.5". On the right side is a feature that sweeps up and to the right, labeled "beta ~0.8".</a></label><br><a href="https://cdn.masto.host/astrodonsocial/media_attachments/files/111/064/362/123/173/018/original/f590131d95be9998.png" rel="external">https://cdn.masto.host/astrodonsocial/media_attachments/files/111/064/362/123/173/018/original/f590131d95be9998.png</a></li><li><label><a rel="external" href="https://gnusocial.jp/attachment/1521063">Summary  MIRI imaging at 15 &amp; 23 micron reveals never-before-seen structures within &amp; around the Beta Pic disk.
A curved “cat’s tail” extending from the disk plane, and a diffuse fan of clumpy nebulosity 
A promising hypothesis is that we are seeing streamers of debris in the aftermath of a giant collision, being blown out by radiation pressure acting on dust, plausibly highly porous silicate dust. Dynamical modeling and further analyses are ongoing. 
These new features reinforce many prior lines of evidence for a recent massive collision. 
et al. in prep.  
NIRCam coronagraphy allows characterization of Beta Pic b from 1.8 - 4.5 microns, and brings detection limits on additional outer planets down to 0.1 Jupiter mass.</a></label><br><a href="https://cdn.masto.host/astrodonsocial/media_attachments/files/111/064/363/705/494/657/original/dd69e35c41a7847c.png" rel="external">https://cdn.masto.host/astrodonsocial/media_attachments/files/111/064/363/705/494/657/original/dd69e35c41a7847c.png</a></li></ol></footer></blockquote>

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Kelly Lepo (kellylepo@astrodon.social)'s status on Friday, 15-Sep-2023 02:19:13 JST Kelly Lepo
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New observations of the debris desk around the star Beta Pictoris from Marshal Perrin. They see a new feature they are calling the "cat's tail" which may be dust being blow out of the system after a collision of two planetesimals.
#JWSTYearOne
In conversationabout a year ago from astrodon.socialpermalink
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