Embed Notice

HTML Code

<blockquote style="position: relative; padding-left: 55px;"><section><a href="https://astrodon.social/users/kellylepo/statuses/111052843352137622">Kelly Lepo (kellylepo@astrodon.social)'s status on Wednesday, 13-Sep-2023 01:41:57 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/111048449661799507" rel="in-reply-to">in reply to</a></div></section><article><p>One thing to come out of several talks this morning, is the importance of stellar flares in the Trappist 1 system.</p><p>The red dwarf in the Trappist 1 system has several flares per day that are similar to flares that happen once per month on the Sun. This tends to complicate planet transit methods and can cause false detections of molecules if you are not careful.<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-4026654">In conversation</a><time datetime="2023-09-13T01:41:57+09:00" title="Wednesday, 13-Sep-2023 01:41:57 JST">about a year ago</time> <span>from <span><a href="https://astrodon.social/@kellylepo/111052843352137622" rel="external" title="Sent from astrodon.social via ActivityPub">astrodon.social</a></span></span><a href="https://astrodon.social/@kellylepo/111052843352137622">permalink</a><h4>Attachments</h4><ol><li><label><a rel="external" href="https://gnusocial.jp/attachment/1511986">Illustration of a planet passing in front of the star. Star has flares and unoccupied star spots.Why does any of this matter for transit spectroscopy? The transit light source effect - Transmission spectroscopy assumes an e out-of-transit, disk-integrated spectrum of the host star can be subtracted to isolate the spectrum of the planet Any difference between the spectrum of the transit chord and the rest of the star leads to contamination, including:
1) occulted starspots
2) unocculted starspots
3) time variability such as flares</a></label><br><a href="https://cdn.masto.host/astrodonsocial/media_attachments/files/111/052/810/146/390/189/original/e2dcfb8a395c2a7d.png" rel="external">https://cdn.masto.host/astrodonsocial/media_attachments/files/111/052/810/146/390/189/original/e2dcfb8a395c2a7d.png</a></li><li><label><a rel="external" href="https://gnusocial.jp/attachment/1511987">Key takeaways
* Flares occur during ~30% of transits, contaminating transit spectra via the transit light source effect.
* We characterize the NIR line and continuum emission of flares for the first time, allowing us to model these events.
* We mask lines and subtract flare models from the transit spectra, ~ finding up to 80% of contamination can be removed.
* Flare mitigation may be a viable pathway to increase the impact of transit observations of small planets around active stars</a></label><br><a href="https://cdn.masto.host/astrodonsocial/media_attachments/files/111/052/814/932/594/975/original/c6e5543ee246f9d1.png" rel="external">https://cdn.masto.host/astrodonsocial/media_attachments/files/111/052/814/932/594/975/original/c6e5543ee246f9d1.png</a></li></ol></footer></blockquote>

Corresponding Notice

Embed this notice
Kelly Lepo (kellylepo@astrodon.social)'s status on Wednesday, 13-Sep-2023 01:41:57 JST Kelly Lepo
in reply to
One thing to come out of several talks this morning, is the importance of stellar flares in the Trappist 1 system.
The red dwarf in the Trappist 1 system has several flares per day that are similar to flares that happen once per month on the Sun. This tends to complicate planet transit methods and can cause false detections of molecules if you are not careful.
#JWSTYearOne
In conversationabout a year ago from astrodon.socialpermalink
Attachments
1. Illustration of a planet passing in front of the star. Star has flares and unoccupied star spots. Why does any of this matter for transit spectroscopy? The transit light source effect - Transmission spectroscopy assumes an e out-of-transit, disk-integrated spectrum of the host star can be subtracted to isolate the spectrum of the planet Any difference between the spectrum of the transit chord and the rest of the star leads to contamination, including: 1) occulted starspots 2) unocculted starspots 3) time variability such as flares
  https://cdn.masto.host/astrodonsocial/media_attachments/files/111/052/810/146/390/189/original/e2dcfb8a395c2a7d.png
2. Key takeaways * Flares occur during ~30% of transits, contaminating transit spectra via the transit light source effect. * We characterize the NIR line and continuum emission of flares for the first time, allowing us to model these events. * We mask lines and subtract flare models from the transit spectra, ~ finding up to 80% of contamination can be removed. * Flare mitigation may be a viable pathway to increase the impact of transit observations of small planets around active stars
  https://cdn.masto.host/astrodonsocial/media_attachments/files/111/052/814/932/594/975/original/c6e5543ee246f9d1.png

Public

Embed Notice

HTML Code

Corresponding Notice