Reposted by Shashank DholakiaEthan Chappel @chappelastro.com · 29/09/2026Saturn with Mimas and Dione on August 3rd, 2026. #Astronomy #Astrophotography 1276
Shashank Dholakia @astroshashank.bsky.social · 26/09/2026Saturn is nearing opposition and I had a chance to photograph it last night finally in excellent seeing conditions! 🧪🔭 #astrophotography 1254
Reposted by Shashank DholakiaSETI Institute @setiinstitute.bsky.social · 24/09/2026#PPOD: Roman has opened its eyes! These fuzzy rings are the first photons of starlight captured by the Nancy Grace Roman Space Telescope’s 300-megapixel Wide Field Instrument. And yes, they’re supposed to look like that—for now. 🧪 🔭 35315
Reposted by Shashank DholakiaBenjamin Pope @benjaminpope.bsky.social · 23/09/2026Australian/NZ students - the call is open for applications to do a fully-funded MRes and/or PhD at Macquarie next year! We have an awesome department, campus, and cool projects. Submit an Expression of Interest here for projects across astro/physics/maths/stats: mq-maps-domestic-eoi.netlify.appmq-maps-domestic-eoi.netlify.appDomestic research EOI · Macquarie UniversityExpress your interest in a Master of Research or PhD at Macquarie University's School of Mathematical and Physical Sciences. Domestic scholarship round, Session 1 2027. 072
Reposted by Shashank DholakiaKevin Hardegree-Ullman @kevinkhu.bsky.social · 10/09/2026In #exoplanet transit land, we often seek planets further out in their orbit. In direct imaging land, it's all about pushing closer in. This new study from @caltechipac.bsky.social VGSRF @jayke.io finds a new close-in candidate in the classic HR 8799 system! 0134
Reposted by Shashank DholakiaJayke Samson Nguyen @jayke.io · 10/09/2026Hot off the press! Via the magic of differentiable forward modeling and of non-redundant masking on JWST we may have found a new exoplanet! One of the most challenging papers I've written, but I'm glad its finally out! Submitted to AJ, pending peer review. arxiv.org/abs/2609.10507arxiv.orgA Candidate Innermost Fifth Planet In the HR 8799 System Revealed By JWST NIRISS Aperture Masking InterferometryWe detect a candidate fifth planet in the HR 8799 system, directly imaged with the JWST/NIRISS Aperture Masking Interferometer (AMI). The detected source lies just above a $3σ$ contrast curve at a con... 2489
Shashank Dholakia @astroshashank.bsky.social · 09/09/2026Saturn season is back on (and so are its rings)! Here is my first attempt this year from a few nights ago. The Cassini division in the rings is about the width of US or Australia and under an arcsec wide, requiring pretty good focus and collimation to resolve. 🧪🔭 #astrophotography 4302
Reposted by Shashank DholakiaJudy Schmidt @geckzilla.bsky.social · 23/08/2026Fun time. Here's H-alpha from Hubble, and its infrared analogue Paschen-alpha from JWST. If you look closely in the center near the star, you can just make out the front and back of the nebula moving away from each other. It's not flat! 1376
Reposted by Shashank DholakiaJames Davenport @jradavenport.com · 10/07/2026A good reminder than when it comes to “space”, astronomers and the actual content of space (eg stars, galaxies, etc) are unfortunately the last consideration 19625
Reposted by Shashank DholakiaBenjamin Pope @benjaminpope.bsky.social · 25/06/2026Advertising international Masters and PhD scholarships in astronomy at Macquarie, one of Australia's leading institutes! Submit an Expression of Interest by 12 July to start your studies in January 2027. We have projects on offer on stars, planets, and galaxies; and instrumentation and data.aas.orgPhD and Masters of Research Positions in Astronomy and Astrophysics | American Astronomical SocietyMacquarie University is seeking outstanding candidates for PhD and Masters of Research scholarships commencing January 2027. 1178
Reposted by Shashank DholakiaRemco de Kok @planetremco.bsky.social · 17/06/2026Another subtlety to take into account when modelling exoplanets. They rotate and have tidal interactions, which modifies the vertical forces on the atmosphere besides gravity. Arnav+Hazra arxiv.org/abs/2606.18100 🧪🔭 #exoplanets 0145
Reposted by Shashank DholakiaAlex Santerne @alexsanterne.bsky.social · 23/06/2026⚠️ Today, we are posting on #arXiv not only 1, nor 2, but 3 papers on the fascinating system #HIP41378. This system hosts 6 and maybe 7 planets 🪐. These papers are the results of a long-lasting investigation on this system initially discovered by the K2's mission, reported in 2016. (🧵 1/6 👇) 15519
Reposted by Shashank DholakiaBenjamin Pope @benjaminpope.bsky.social · 19/06/2026Looking forward to having everyone here for Cool Stars in July 2028 - when a total solar eclipse will pass directly over the city centre! 7534
Shashank Dholakia @astroshashank.bsky.social · 12/06/2026Forgot to mention in this thread! I have posted a barebones script to correct uncal NIRISS data using the sinusoid we infer in our paper. Would be great to try it on any NIRISS data you have lying around and see what the effects are on your data! #astro #exoplanets 🔭 github.com/shashankdhol...github.comGitHub - shashankdholakia/niriss-cal-inl: Calibrating the JWST NIRISS analog-to-digital converter periodic integral nonlinearityCalibrating the JWST NIRISS analog-to-digital converter periodic integral nonlinearity - shashankdholakia/niriss-cal-inl 141
Shashank Dholakia @astroshashank.bsky.social · 11/06/2026Shout-out to all my collaborators on this paper who made this possible. Especially @benjaminpope.bsky.social for encouraging me to follow these "odd" data quirks 170
Shashank Dholakia @astroshashank.bsky.social · 11/06/2026Thread on our new paper on arxiv today! We stumbled across a weird sinusoidal systematic that we think appears in every observation from the NIRISS instrument on JWST. We derive a correction and see how much it impacts exoplanet spectra. (1/N) #astro #exoplanets 🔭🧪 arxiv.org/abs/2606.11983arxiv.orgCalibration of an Analog-to-Digital Conversion Nonlinearity in JWST/NIRISSWe quantify an unusual flux-dependent systematic which is periodic in raw counts in flight data from the James Webb Space Telescope's Near Infrared Imager and Slitless Spectrograph (JWST/NIRISS), used... 23612
Reposted by Shashank DholakiaColin Stuart 🔭 @colinstuartspace.bsky.social · 06/04/2026A starspot on Zeta Andromedae. That’s a surface feature on a star 181 light years away. #astronomy ⚛️🧪 Image: Roettenbacher et al 1175
Shashank Dholakia @astroshashank.bsky.social · 31/03/2026Thank you Ben!! I obviously couldn't have done it without you! Now to space out for a few days 180
Reposted by Shashank Dholakia💀Adina Feinstein PhD 💀 @afeinstein20.bsky.social · 17/03/2026really exciting work lead by Catriona Murray! TOI-3884 b is a planet on a polar orbit around an M dwarf. The transit has a persistent starspot crossing event. Using JWST, we measured the properties of the starspot and the Prot of the star 👀 arxiv.org/abs/2603.15414 🔭 #astronomy 🌟 #stellarastro 1298
Reposted by Shashank DholakiaJonatan Rudrasingam @astrojonatan.bsky.social · 28/02/2026My first scientific paper is now public on arXiv! TESS struggles with the brightest stars due to saturation from overexposure. This is unfortunate, because these are the stars that are amenable to photon-hungry follow-up methods, such as spectroscopy or interferometry (1/9) arxiv.org/abs/2602.22472arxiv.orgHalo Photometry and Asteroseismology for 98 of the Brightest Stars Observed by TESSThe Transiting Exoplanet Survey Satellite (TESS) mission has facilitated studies of asteroseismology, eclipsing binaries, and transits in many stars. However, the brightest stars saturate TESS, yet th... 1154
Reposted by Shashank DholakiaBenjamin Pope @benjaminpope.bsky.social · 04/03/2026Do you already have a Masters? Do you want to do a PhD in exoplanet radial velocity surveys with me at Macquarie University in Sydney? Then have I got an ad for you!mq.edu.auDiscovering exoplanets with machine learningDevelop a machine-learned model of stellar spectra and instrumental quirks, and use it to discover exoplanets in radial velocity data. 12313
Shashank Dholakia @astroshashank.bsky.social · 10/02/2026If you're on the postdoc market for exoplanet/ML applications--strong recommendation to apply for this job at Macquarie, Ben is great!! 112
Reposted by Shashank DholakiaAstrobites @astrobites.bsky.social · 01/02/2026From Ryan White @astroryan.bsky.social : There are a few locations in the solar system where the push and pull of gravity mellows out and you can orbit in (relative) peace. Read all about these islands of tranquility we call Lagrange points! ⚛️ 🔭 ☄️ 🧪 astrobites.org/2026/01/29/w...astrobites.orgWhat’s the (Lagrange) point?There are a few locations in the solar system where the push and pull of gravity mellows out and you can orbit in (relative) peace. Read all about these islands of tranquility we call Lagrange points! 29221
Reposted by Shashank DholakiaCosmicRami 🏳️🌈🏳️⚧️ @rami.spaceaustralia.com · 30/12/2025Stories from #SpaceAustralia in 2025: Checking out the God of Chaos — Apep — using JWST and the VLT. This unique triple stellar system is wild! Some nice work on one of the papers here led by fellow Macquarie University student Ryan White! 🔭 2157
Reposted by Shashank DholakiaShahrin Ahmad (Shah) @shahgazer @shahgazer.bsky.social · 05/12/20256 days of sunspots evolution. AR4296 and AR4294 OK, this is getting really tricky to arrange. :-} #astronomy #astrophotography 2201
Shashank Dholakia @astroshashank.bsky.social · 02/12/2025One thing I will miss about UQ is the incredible biodiversity on campus. Thread of all the animals I photographed yesterday along one stretch of railing about 10m long. (warning to the squeamish about bugs) Starting with this bronze hopper (Helpis minitabunda): (1/N) #bugsky #nature #spidersky 🌿 2162
Reposted by Shashank DholakiaAstronomy Picture of the Day 🪐 @apod.shinyakato.dev · 24/11/2025🔭 Apep: Unusual Dust Shells from Webb Image Credit: NASA, ESA, CSA, STScI, JWST; Science: Y. Han (Caltech), R. White (Macquarie U.); Image Processing: A. Pagan (STScI) apod.nasa.gov/apod/ap25112... 214339
Shashank Dholakia @astroshashank.bsky.social · 20/11/2025I love this way of explaining papers!! Check this out by @astroryan.bsky.social ! 050
Reposted by Shashank DholakiaRyan White @astroryan.bsky.social · 19/11/2025Very excited to share the NASA/ESA/STScI press release of our team's work on Apep! It's a terrific writeup, complete with a brand new beautiful visualisation of the nebula geometry. 1/? ⚛️🔭🧪 science.nasa.gov/missions/web...science.nasa.govWebb First to Show 4 Dust Shells 'Spiraling' Apep, Limits Long Orbit - NASA ScienceNASA’s James Webb Space Telescope has delivered a first of its kind: a crisp mid-infrared image of a system of four serpentine spirals of dust, one expanding 9540128
Shashank Dholakia @astroshashank.bsky.social · 11/11/2025More h-alpha solar timelapses. Here's a loop of plasma twisting off AR4247 from yesterday around 21:30UTC. This might have been part of a small C-class flare. I think it looks like a tornado on the Sun! 🔭 #astronomy #astrophotography 0193
Reposted by Shashank DholakiaDr. Craig DeForest ☀️ @craig.deforest.org · 31/10/2025This is exactly the reason every mission and scientist should have a wide-open data policy! PUNCH has specific science objectives (looking at the solar wind) – but in the right hands the data can reveal amazing things NOT part of our original science. Giving those hands access is best for all. ☀️🔭🧪 0445
Reposted by Shashank DholakiaBenjamin Pope @benjaminpope.bsky.social · 28/10/2025Absolutely delighted to read this news after an anxious wait - Christian Schwab and I will be looking for a postdoc on extremely precise radial velocities at Macquarie soon! Congratulations to everyone on what looks like an unusually large haul of projects for astronomy. 5334
Shashank Dholakia @astroshashank.bsky.social · 27/10/2025Really cool astrobite about a really cool paper! 080
Shashank Dholakia @astroshashank.bsky.social · 27/10/2025My attempt at Comet A6 Lemmon from subpar conditions last night. Wispy clouds still visible in the final image. Was surprisingly bright, p sure I could see it with the unaided eye! Easy through binocs. Canon R5, RF100mm f2.8 19 images, ISO 800, 30s f3.2 🔭 #astronomy #comet 312024
Shashank Dholakia @astroshashank.bsky.social · 19/10/20251.5 hour timelapse of the Sun in hydrogen-alpha. I set this up quite late in the day and the Sun was pretty quiet so I was surprised how much evolution is visible in the prominences, granulation and the active region. I'll have to try more of this. Video is set to loop forwards, then in reverse 🔭 36715
Reposted by Shashank DholakiaBenjamin Pope @benjaminpope.bsky.social · 14/10/2025In a companion paper, PhD student @maxecharles.bsky.social applies this to reconstructing complex images, not just fields of dots. We apply a regularised maximum likelihood method to restore clean, diffraction limited imaging by fitting directly to pixel level data.arxiv.orgImage reconstruction with the JWST InterferometerFlying on board the James Webb Space Telescope (JWST) above Earth's turbulent atmosphere, the Aperture Masking Interferometer (AMI) on the NIRISS instrument is the highest-resolution infrared interfer... 1244
Reposted by Shashank DholakiaBenjamin Pope @benjaminpope.bsky.social · 14/10/2025In the first paper Louis Desdoigts (ex PhD in my group, now Leiden postdoc) learns a model for the entire AMI system's optical physics together with a neural network 'effective detector model' the sensor, which suffers from a serious 'brighter-fatter effect' that blurs images at the pixel level.arxiv.orgAMIGO: a Data-Driven Calibration of the JWST InterferometerThe James Webb Space Telescope (JWST) hosts a non-redundant Aperture Masking Interferometer (AMI) in its Near Infrared Imager and Slitless Spectrograph (NIRISS) instrument, providing the only dedicate... 1183
Reposted by Shashank DholakiaBenjamin Pope @benjaminpope.bsky.social · 14/10/2025Thrilled to have two years' of work out, in a pair of papers led by @gradientrider.bsky.social and @maxecharles.bsky.social. We've built a data-driven calibration of the James Webb Interferometer to near its fundamental limits for high-res imaging - explainer at @aunz.theconversation.com!theconversation.comHow we sharpened the James Webb telescope’s vision from a million kilometres awayThe only Australian hardware on board the legendary telescope is starting to fulfil its duties. 115942
Reposted by Shashank DholakiaGeorge Monbiot @georgemonbiot.bsky.social · 08/10/2025ME/CFS is a devastating condition that has long been denied, dismissed, psychologised and underdiagnosed. Research is at last starting to catch up with it, with glimmers of hope for those who have been left untreated for so long. There's a huge BUT coming ...🧵 www.theguardian.com/society/2025...theguardian.comScientists develop first ‘accurate blood test’ to detect chronic fatigue syndromeResearch could offer hope for ME patients – but some experts urge caution and say more studies needed 571511633
Reposted by Shashank DholakiaSabina Sagynbayeva @sabinastro.bsky.social · 03/10/2025Okay people, welcome my new paper into the world!!! With Isabel Colman and @farrwill.bsky.social arxiv.org/abs/2510.02255arxiv.orgRotation Periods for Stars in Open Cluster NGC 6819 From Kepler IRIS Light CurvesWe present an updated catalog of stellar rotation periods for the 2.5 Gyr open cluster NGC 6819 using the Kepler IRIS light curves from superstamp data. Our analysis uses Gaussian Process modeling to ... 2122
Shashank Dholakia @astroshashank.bsky.social · 06/10/2025And as a bonus, here's a false-color composite of the same. Blue is mapped to all of visible, green is infrared beyond 850nm, and red is the methane band at 889nm. 🔭 #astrophotography #saturn 25514
Shashank Dholakia @astroshashank.bsky.social · 06/10/2025Been imaging Saturn while its rings are nearly edge-on and tried some infrared filters. At this 889nm methane band, Saturn strongly absorbs light, whereas its rings scatter equally across wavelengths. Also a good visual demo of how astronomers measure exoplanet atmospheres! 🔭🧪 #astrophotography 413526
Reposted by Shashank DholakiaKevin J. Kircher @kevinjkircher.com · 04/10/2025Sometimes I think about how from 1935-1975ish, Bell Labs produced an insane amount of revolutionary science and technology, including 11 Nobel Prizes, the transistor, UNIX, C, the laser, the solar cell, information theory, etc. The secret? Provide scientists with ample, steady, no-strings funding.sites.stat.columbia.edu 501716482
Reposted by Shashank DholakiaKevin J. Kircher @kevinjkircher.com · 04/10/2025Research also shows that spreading smaller amounts of funding out over more researchers generally delivers better scientific outcomes per dollar spent than focusing bigger grants on fewer researchers. journals.plos.org/plosone/arti...journals.plos.orgBig Science vs. Little Science: How Scientific Impact Scales with FundingAgencies that fund scientific research must choose: is it more effective to give large grants to a few elite researchers, or small grants to many researchers? Large grants would be more effective only... 211431
Reposted by Shashank DholakiaMychal Threets @mychal3ts.bsky.social · 01/10/2025There have been two hosts in the history of Reading Rainbow. The Legend of Literacy, LeVar Burton! And... me, Mychal Threets, a librarian 🥹🤯 I am a reader, a librarian because LeVar Burton and Reading Rainbow made us believe and see we belong in books, we belong everywhere ✨ youtu.be/e7es7qdWVnU 15854011115
Reposted by Shashank DholakiaAbode Press @abodepress.bsky.social · 01/10/2025Happy Pub Day to Earth and Earth-like Planets by Devaki D. Devi 🥳 Earth and Earth-like Planets is officially out for publication! 🧡 All pre-orders will be shipped as soon as possible.📦 If you haven't ordered your copy yet, you can purchase one here: www.abodepress.com/product-page... 043
Reposted by Shashank DholakiaBenjamin Pope @benjaminpope.bsky.social · 01/10/2025This work owes a lot to ideas of and conversations with Rodrigo Luger, Keaton Burns, Geoff Vasil, and Ben Roberts, and it's been a really fun project with Shashank! ... and Shashank is on the postdoc market now, so if you're working on stars and planets, Jax, imaging science and applied maths... 061
Shashank Dholakia @astroshashank.bsky.social · 01/10/2025New paper by me and @benjaminpope.bsky.social! How well can we map a star using optical interferometry? This is just a submitted preprint at the moment--comments and questions welcome! (1/N) arxiv.org/abs/2509.25433 55011