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Visiting guest this week
by haffert＠strw.leidenuniv.nl 17 Mar '25

17 Mar '25

Hi all, This week Dr. Joseph Long will be visiting Leiden Observatory to work with us on the development of new High-Contrast Imaging post-processing techniques. I am planning to take him out to dinner on Tuesday evening (tomorrow). Please let me know if you want to join us by the end of today. Then I can reserve a table with enough places. Also, Dr. Long will also give a talk at the instrumentation group meeting this week. Title and abstract are below. Title: More data than you want, fewer data than you need: machine learning approaches to starlight subtraction with MagAO-X Abstract: High-contrast imaging relies on post-processing to remove residual starlight from the host star to reveal planets and disks. Most observers do this with principal components analysis (i.e. KLIP) using modes computed from the science images themselves. These modes may not be orthogonal to planet and disk signals, leading to over-subtraction. The wavefront sensor data recorded during the observation provide an independent signal with which to predict the instrument point-spread function. MagAO-X is an extreme adaptive optics system for the 6.5-meter Magellan Clay telescope. MagAO-X is designed to save all sensor information, including millions of kHz-speed wavefront measurements per observation. My approach combines a GPU-accelerated physical optical model and a machine learning model within the same automatic differentiation framework (specifically JAX by Google) to "learn" a mapping from wavefront sensor frames to the inputs of a physical optics model. This preserves the interpretability of the model while also enforcing physical constraints. I will present progress so far in constructing and training such a model, as well as some future directions I plan to explore. Met vriendelijke groet / With kind regards, Dr. Sebastiaan Haffert Assistant professor Leiden Observatory, Leiden University Einsteinweg 55, 2333 CC, Leiden, The Netherlands

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[instrumentation meeting] Oort room (BM 4.33) @ 11:00
by Michiel Darcis 12 Mar '25

12 Mar '25

Hi all, This week another instalment of the instrumentation meeting in the Oort room (BM 4.33) @ 11:00. Cheers, Michiel Michiel Darcis is inviting you to a scheduled Zoom meeting. Join Zoom Meeting https://universiteitleiden.zoom.us/j/66303224819?pwd=cqs8QU5ybpM7Wd78g13oUA… Meeting ID: 663 0322 4819 Passcode: nsiR4=A7 --- One tap mobile +496971049922,,66303224819#<tel:+496971049922,66303224819>,,,,*72170106# Germany --- Dial by your location • +49 69 7104 9922<tel:+496971049922> Germany Meeting ID: 663 0322 4819 Passcode: 72170106 Find your local number: https://universiteitleiden.zoom.us/u/cbieNLXFga

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Group meeting Oort room (BM 4.33) at 11:00.
by haffert＠strw.leidenuniv.nl 05 Mar '25

05 Mar '25

Hi all, Don’t forget the most important event of the week. Group meeting today at 11:00! Send slides to me and Michiel. We also have a visitor today, Jalo Nousiainen, who will join us during the meeting. Zoom link for the remote folks: Sebastiaan Haffert is inviting you to a scheduled Zoom meeting. https://universiteitleiden.zoom.us/j/7267353069?pwd=JQ4pnKb14HkPby0v9XJqmcg… Meeting ID: 726 735 3069 Passcode: s$Rw5KhA Met vriendelijke groet / With kind regards, Dr. Sebastiaan Haffert Assistant professor Leiden Observatory, Leiden University Einsteinweg 55, 2333 CC, Leiden, The Netherlands

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Good info for this group: NYRIA 2025 – save the date
by Ioannis Politopoulos 27 Feb '25

27 Feb '25

Hi All, The NYRIA Workshop date is set and we will soon open the applications. This is a great opportunity for all instrumentation people, particularly for people early in their career to present their work and get exposed to the research of other people/institutes in the general field of astronomical instrumentation. I would like to especially bring it to the attention of 1st-2nd year PhDs and Master students who have a nice thing to present, but everyone is more than welcome :) Regarding applications fees it's still tbd, but usually it's in the order of 50-70 euro and hotel is included. Feel free to share this with whoever you think would be interested. See the full text with relevant links and information below. Cheers, Giannis Dear instrumentation enthusiasts,The Network of Young Researchers in Instrumentation for Astronomy (NYRIA) 2025 committee is thrilled to announce the 10th anniversary edition of the annual NYRIA workshop.*What:*NYRIA 2025 workshop *Where:*Max Planck Institute for Astronomy / Haus der Astronomie, Heidelberg, Germany *When:*22nd - 26th of September 2025 *Link:*https://nyriastronomy.github.io/workshops/2025/ <https://nyriastronomy.github.io/workshops/2025/>NYRIA is a community for early career (all levels up to and including postdocs or equivalent) researchers working in the field of ground based visible and infrared instrumentation for astronomy. We host an annual workshop of around 40 people, where each participant gives a short talk, takes part in an instrumentation based hackathon and joins tours of the astronomical facilities etc.Applications will open on the 23rd of March. If you have any questions, please don’t hesitate to get in touch via the workshop’s email address:nyria@mpia-hd.mpg.de<mailto:nyria@mpia-hd.mpg.de>. <mailto:nyria@mpia-hd.mpg.de.>

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[instrumentation meeting] Oort room BM4.33! @ 11:00
by Michiel Darcis 26 Feb '25

26 Feb '25

Hi all, To not travel so far for a bigger room, the instrumentation meetings will from now on be in the Oort room (BM 4.33). The time is again 11:00. See you there. Cheers, Michiel Michiel Darcis is inviting you to a scheduled Zoom meeting. Join Zoom Meeting https://universiteitleiden.zoom.us/j/66303224819?pwd=cqs8QU5ybpM7Wd78g13oUA… Meeting ID: 663 0322 4819 Passcode: nsiR4=A7 --- One tap mobile +496971049922,,66303224819#<tel:+496971049922,66303224819>,,,,*72170106# Germany --- Dial by your location • +49 69 7104 9922<tel:+496971049922> Germany Meeting ID: 663 0322 4819 Passcode: 72170106 Find your local number: https://universiteitleiden.zoom.us/u/cbieNLXFga

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Instrumentation social
by Rico Landman 24 Feb '25

24 Feb '25

Hi all, Please fill in this doodle to plan the upcoming instrumentation social: https://doodle.com/meeting/participate/id/b6GlKkVd. It would be great if everyone could fill it in before the end of the week. Current plan is to go for dinner and go bowling/pooling afterwards, but I am open to other suggestions :) Best, Rico

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[instrumentation meeting] Different room! CE.0.12 @11:00
by Michiel Darcis 19 Feb '25

19 Feb '25

Hi all, Because our group is growing bigger, we are going to move to a bigger room, CE.0.12 on the ground floor. The time is as usual 11:00. Cheers, Michiel Michiel Darcis is inviting you to a scheduled Zoom meeting. Join Zoom Meeting https://universiteitleiden.zoom.us/j/66303224819?pwd=cqs8QU5ybpM7Wd78g13oUA… Meeting ID: 663 0322 4819 Passcode: nsiR4=A7 --- One tap mobile +496971049922,,66303224819#<tel:+496971049922,66303224819>,,,,*72170106# Germany --- Dial by your location • +49 69 7104 9922<tel:+496971049922> Germany Meeting ID: 663 0322 4819 Passcode: 72170106 Find your local number: https://universiteitleiden.zoom.us/u/cbieNLXFga

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[instrumentation meeting] BW3.34a (Rigel) @ 11:00
by Michiel Darcis 12 Feb '25

12 Feb '25

Hi all, This week we will be in the room in the opposite hallway (BW3.34a Rigel) at 11:00. Some of you will be at the NOVA meeting but that does not withhold the rest of us from having a great instrumentation time. As usual for those that come and do not have a PhD yet: send your two slides to haffert(a)strw.leidenuniv.nl<mailto:haffert@strw.leidenuniv.nl> and m.darcis(a)sron.nl<mailto:m.darcis@sron.nl>. Cheers, Michiel

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[instrumentation meeting] BW3.33a (Capella) @ 11:00
by Michiel Darcis 05 Feb '25

05 Feb '25

Hi all, The first email on the new mailing list is a fact! Today we have another installment of the instrumentation meeting at BW3.33a (Capella) at 11:00. See you there, with your slides. Cheers, Michiel Michiel Darcis is inviting you to a scheduled Zoom meeting. Join Zoom Meeting https://universiteitleiden.zoom.us/j/66303224819?pwd=cqs8QU5ybpM7Wd78g13oUA… Meeting ID: 663 0322 4819 Passcode: nsiR4=A7 --- One tap mobile +496971049922,,66303224819#<tel:+496971049922,66303224819>,,,,*72170106# Germany --- Dial by your location • +49 69 7104 9922<tel:+496971049922> Germany Meeting ID: 663 0322 4819 Passcode: 72170106 Find your local number: https://universiteitleiden.zoom.us/u/cbieNLXFga

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