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Johanna Vos

@johannavos.bsky.social
609 followers 279 following 31 posts

Astrophysicist studying Exometeorology | Associate Professor & Royal Society University Research Fellow at Trinity College Dublin | Visiting Scientist at American Museum of Natural History | she/her | johannavos.github.io

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Reposted by Johanna Vos
Jonathan Fortney @jjfplanet.bsky.social · 18/09/2026
*8* postdoctoral positions in atmospheric physics, from the Earth to Exoplanets: aas.org/jobregister/... This is part of the Multiscale Physics of Clouds Across Planetary Atmospheres collaboration, funded by the Simons Foundation, led by Prof. @astrocaroline.bsky.social!
aas.org
Postdoctoral Researchers — Multiscale Physics of Clouds Across Planetary Atmospheres | American Astronomical Society
The Multiscale Physics of Clouds Across Planetary Atmospheres collaboration, funded by the Simons Foundation, is seeking 8 postdoctoral researchers to develop new approaches to understanding clouds ac...
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Dr. Caprice Phillips @capricephillips.bsky.social · 02/08/2026
My heart is so full! The “Charting Substellar Worlds” conference was a great success. Amazing science talks and community building. Conference organizing was so stressful, but so worth it in the end. Along with talks and we had s’mores, karaoke, and even some folks surfing 🏄🏾‍♂️.
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Cian O'Toole @astrotoole.bsky.social · 28/03/2026
I am delighted to share that my first paper has now been accepted for publication in Astronomy and Astrophysics and is now on the arXiv!! arxiv.org/abs/2603.24663 In this paper I disentangle the drivers of variability in three early L-dwarfs using HST/WFC3. More info below 🧵!!
arxiv.org
Disentangling auroral, cloud and magnetic spot driven variability in three early L-dwarfs with HST/WFC3
Variability monitoring provides an unparalleled insight into the atmospheric processes of brown dwarfs and directly imaged exo-planets. Inhomogeneous clouds, aurorae and magnetic spots have all been p...
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Maddie Lam @maddielam.bsky.social · 27/03/2026
Proud to announce that my first PhD paper has now been accepted and is live on arXiv!! arxiv.org/abs/2603.24662 In this paper I provide the first analyses of JWST spectra of a sample of young, co-eval L dwarfs, focusing on the silicate absorption and whether there are any equator-to-pole variations.
arxiv.org
Clouds with a silicate lining: Using JWST spectra to probe atmospheric diversity in young AB Dor L dwarfs
We present the first full JWST NIRSpec Prism and MIRI LRS 0.6 - 14 $μ$m (R ~ 100) spectra and analysis of five ~ 133 Myr L dwarf members of the AB Doradus moving group and one probable $\sim 500$ Myr ...
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Johanna Vos @johannavos.bsky.social · 27/03/2026
TWO recently accepted papers on arxiv today from our group, led by PhD students @maddielam.bsky.social and @astrotoole.bsky.social. If you like brown dwarfs, variability, clouds, aurorae and/or magnetic spots there is something here for you! 👀 arxiv.org/abs/2603.24662 arxiv.org/abs/2603.24663
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Johanna Vos @johannavos.bsky.social · 20/01/2026
I had such a great time visiting Oxford yesterday and getting a preview of all the cool science coming out of the exoplanets groups. Thanks so much for hosting me @airbornegrain.bsky.social @jaynebirkby.bsky.social ! 🪐
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Eric Mamajek @ericmamajek.bsky.social · 10/12/2025
Nancy Grace Roman Space Telescope Cycle 1 Call for Proposals is Open! roman-docs.ipac.caltech.edu/roman-propos... Proposal Deadline: March 17, 2026 www.nasa.gov/missions/rom... "Roman is slated to launch by May 2027, but the team is on track for launch as early as fall 2026." #NASA #astronomy #AAS
roman-docs.ipac.caltech.edu
Cycle 1 Call for Proposals - Roman User Documentation
This article contains... The complete details of this Call for Proposals are contained within this downloadable PDF document: Roman_Cycle1_Call.pdf. Executive S
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Evert Nasedkin @evertnasedkin.bsky.social · 09/12/2025
🔭 A bit late, but I've finally put together a zenodo archive for the JWST observations and retrievals of SIMP-0136, based on my paper from earlier this year. If you want to play around with this super interesting models, or dive into the results, it's all available at zenodo.org/records/1785...! 🧪
zenodo.org
Data and models for "The JWST Weather Report: retrieving temperature variations, auroral heating, and static cloud coverage on SIMP-0136"
This archive contains the reduced NIRSpec and MIRI spectra of the variable brown dwarf, SIMP J013656.5+093347.3 as observed in JWST GO 3548, and published in Nasedkin et al. 2025. Also included are th...
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Xueqing Chen @xqchen.bsky.social · 27/11/2025
Happy to share my insights on the potential of Doppler imaging with the ELT at #ExoELT last week! Also my first time at #ESO Garching!
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Hannah Wakeford @stellarplanet.bsky.social · 25/11/2025
CDT in Aerosol Science is welcoming applications for fully-funded PhD studentships as part of our 8th cohort to start in autumn 2026: www.aerosol-cdt.ac.uk/2026-projects/ Aerosol science is crucial to so many things, check out the linked project catalogue for studentships! #PhD #academicjobs
aerosol-cdt.ac.uk
2026 projects | Aerosol Science CDT
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Johanna Vos @johannavos.bsky.social · 24/11/2025
We are hiring a new Assistant Professor in Astrophysics at Trinity College Dublin!! ☘ Job ad here: aas.org/jobregister/... Deadline: Jan 02 2026 Please share widely! 🪐🔭
aas.org
Assistant Professor in Astrophysics | American Astronomical Society
The School of Physics at Trinity College Dublin invites applications for a position at the level of Assistant Professor in the field of observational or theoretical astrophysics. We seek motivated ind...
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paulmolliere.bsky.social @paulmolliere.bsky.social · 17/10/2025
Seeking PhD candidates that want to do a thesis on exoplanet atmosphere retrieval + machine learning inference. Please apply by 31 October to Dr. Max Dax's and my shared project here: is.mpg.de/news/new-max... . Abstract for the thesis project is attached to this thread below!
is.mpg.de
New Max Planck Artificial Intelligence Network Starts Call for Applications for its Ph.D. Program
The Max Planck Artificial Intelligence Network is a Ph.D. Program that provides doctoral researchers with fully funded Ph.D. fellowships and a pool of outstanding faculty comprising directors and inde...
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Heidi B. Hammel @hbhammel.bsky.social · 10/10/2025
New unified model of equatorial winds on giant planets helps to explain some of the zonal wind observations 🔭 I and my colleagues have made for Neptune and Uranus over the past few decades - www.science.org/doi/10.1126/...
science.org
From gas to ice giants: A unified mechanism for equatorial jets
A bifurcation in equatorial jet formation can explain the differences between the gas and ice giants.
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Keith Smith @drkeithsmith.bsky.social · 06/10/2025
The phosphine molecule, PH3, has been proposed as a biosignature in rocky planets. In @science.org, Burgasser et al. report phosphine in a brown dwarf atmosphere. "We therefore caution against the use of phosphine as a biosignature". #stellarastro #exoplanet ☄️ www.science.org/doi/10.1126/...
science.org
Observation of undepleted phosphine in the atmosphere of a low-temperature brown dwarf
The atmospheres of low-temperature brown dwarfs and gas giant planets are expected to contain the phosphine molecule, PH3. However, previous observations have shown much lower abundances of this molec...
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Jennifer Ouellette @jenlucpiquant.bsky.social · 27/09/2025
New JWST Data Shows Rogue Planet With a Colorful Combo of Wavelengths, Strong Storms, and Beautiful Auroras www.discovermagazine.com/new-jwst-dat...
discovermagazine.com
New JWST Data Shows Rogue Planet With a Colorful Combo of Wavelengths, Strong Storms, and Beautiful Auroras
Learn about SIMP-0136, a rogue planet emitting wavelengths that reveal patchy clouds and auroras similar to the Northern Lights.
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Evert Nasedkin @evertnasedkin.bsky.social · 26/09/2025
🔭 It's paper day! Today I'm sharing the latest in a series of papers looking at the weather on other worlds, in this case bringing you the weather report from a nearby T-dwarf, SIMP-0136. 🪐 🧵 to follow...
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Laura Kreidberg @lkreidberg.bsky.social · 15/09/2025
We have job opportunities in the APEx department at MPIA - please spread the word! Postdocs: aas.org/jobregister/... Tenure-track staff: aas.org/jobregister/... Max Planck Research Group Leaders: aas.org/jobregister/... + happy to host ERC, Humboldt, and other third-party funds.
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Johanna Vos @johannavos.bsky.social · 03/09/2025
So great to see another incredible JWST variability study by Akhmetshyn et al. on the planetary-mass object SIMP 0136. These kinds of datasets reveal the most important details about the atmosphere and how they change over time. We are officially in in the era of exoplanet weather! 🪐☁️
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Dr Jake Taylor @astrojake.bsky.social · 08/08/2025
I rarely see Planetarium Astronomer jobs being advertised in the UK, we have a distinct lack of Planetariums. The Royal Observatory in Greenwich is currently hiring for one! app.vacancy-filler.co.uk/salescrm/Car...
app.vacancy-filler.co.uk
Planetarium Astronomer | Royal Museums Greenwich
About usRoyal Museums Greenwich is a collection of diverse historical sites. The sites are the National Maritime Museum, Cutty Sark, the Royal Observatory, and the Queen’s House. Each of these sites h...
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Johanna Vos @johannavos.bsky.social · 23/07/2025
Super excited for this accepted HST+VLA program led by Cian O'Toole, who hopes to expand our knowledge of extrasolar aurorae into the UV 🔭
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Johanna Vos @johannavos.bsky.social · 20/07/2025
We are so excited for Dr McCarthy @alliemccarthy.bsky.social to join the group @tcddublin.bsky.social 🪐☁️
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Maddie Lam @maddielam.bsky.social · 16/07/2025
Attended my first ever conference last month at #EASCork! Super inspiring to hear about what’s going on in exoplanets and brown dwarfs!
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Johanna Vos @johannavos.bsky.social · 30/06/2025
Very proud of Cian O'Toole who gave his very first conference talk at #EAS2025 last week. 🔭 He is investigating the drivers of variability in three brown dwarfs using observations from HST, VLA and a new framework for modelling variable atmospheres. Paper is incoming so watch this space! 📄📄📄
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Johanna Vos @johannavos.bsky.social · 26/06/2025
It’s a beautiful day in Cork to kick off our symposium on giant exoplanets and brown dwarfs #EAS2025
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Johanna Vos @johannavos.bsky.social · 23/06/2025
Looking forward to speaking at Astronomy on Tap this Wednesday in Cork! 🍻💫 Tickets available at this link www.eventbrite.ie/e/astronomy-...
eventbrite.ie
Astronomy on Tap Cork: European Astronomical Society Edition
Public talks about astronomy from professional astrophysicists right here in Cork while you enjoy a pint and maybe a pizza too!
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NSF–DOE Rubin Observatory @rubinobservatory.org · 23/06/2025
Introducing...your sneak peek at the cosmos captured by NSF–DOE Vera C. Rubin Observatory! Can you guess these regions of sky? This is just a small peek...join us at 11am US EDT for your full First Look at how Rubin will #CaptureTheCosmos! 🔭🧪 #RubinFirstLook ls.st/rubin-first-look-livestream
A sprawling, textured field of galaxies scattered across the deep black of space. It is filled with the delicate smudges and glowing cores of galaxies of many shapes, sizes and colors, as well as the bright multi-colored points of stars. The image focuses on a collection of interacting galaxies connected by delicate streams of stars. At top center lies a large elliptical galaxy that is dense and smooth, like a polished stone glowing with golden light. Like delicate spider silk or stretched taffy, these stellar bridges link the large elliptical to the few larger galaxies beneath, evidence of past collisions.

All throughout the image, thousands of galaxies gather in clusters or are spread throughout, like glittering gems strewn on a table. Some are sharp-edged and spiral, like coiled ribbons; others round and diffuse, like polished pebbles. Still others are just smudges of various colors against the black of space. The background is peppered with pinpoint stars in reds, yellows, and blues, crisp against the velvet black. A cosmic tapestry of glowing tan and pink gas clouds with dark dust lanes. In the upper right, the Trifid Nebula resembles a small flower in space. Its soft, pinkish gas petals are surrounded by blue gas, and streaked with dark, finger-like veins of dust that divide it into three parts. It radiates a gentle, misty glow, diffuse and soft like the warmth of breath on a cold hand. To the lower left, the much larger Lagoon Nebula stretches wide like a churning sea of magenta gas, with bright blue, knotted clumps sprinkled throughout where new stars are born. Both nebulae are embedded in a soft tan backdrop of gas that is brighter on the left than on the right, etched with dark tendrils of dust and sprinkled with the pinpricks of millions of stars.A sprawling, textured field of galaxies scattered across the deep black of space. It is filled with the delicate smudges and glowing cores of galaxies of many shapes, sizes and colors, as well as the bright multi-colored points of stars. To the lower left is a region filled with the hundreds of golden glittering gems of a distant galaxy cluster. In the foreground, below and right of center, two blue spiral galaxies look like eyes beneath the entangled mass of a triple galaxy merger in the upper right. A few bright blue points of foreground stars pierce the glittering tapestry.

All throughout the image, thousands of galaxies gather in clusters or are spread throughout, like glittering gems strewn on a table. Some are sharp-edged and spiral, like coiled ribbons; others round and diffuse, like polished pebbles. Still others are just smudges of various colors against the black of space. The background is peppered with pinpoint stars in reds, yellows, and blues, crisp against the velvet black.
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Space Telescope Science Institute @stsci.edu · 10/06/2025
NEWS: #NASAWebb has directly imaged a cold exoplanet in an extremely misaligned orbit for the first time. The observations have surprised researchers in more than one way: webbtelescope.pub/3ZSctun #AAS246 🔭 🧪
This image shows the exoplanet 14 Herculis c. The view is mostly black, with very faint red splotches in the central region of the image. At the center of the image, there is a black circle, and in the center of that, there is a star symbol representing a real star. This black circle blocks the light from the host star. To the lower right of the circle is a fuzzy bright orange circle, which is the exoplanet.
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Benjamin Pope @benjaminpope.bsky.social · 05/06/2025
Macquarie has put out the call for fully-funded PhD applications in all areas of astronomy, to start January 2026: aas.org/jobregister/... Applications due 2 July to astrohdrinfo@mq.edu.au. International scholarships will be competitive, typically expecting publication and/or excellent GPA.
aas.org
PhD & Masters of Research Scholarships in Astrophysics | American Astronomical Society
Macquarie University is seeking outstanding candidates for PhD and Masters of Research scholarships commencing between January and June 2026.
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Matthew Kenworthy @mattkenworthy.bsky.social · 04/06/2025
Together with Sebastiaan Haffert our review on “High-Contrast Coronagraphy” is out - writing an ARA&A review has been on my academic bucket list, and I’m very proud of the result. It uses the showyourwork! framework, making it a completely reproducible paper. #FAIR #astrodon #exoplanets
Different telescope mirror apertures and their resultant point spread functions.
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Denis Sergeev @meteodenny.bsky.social · 23/04/2025
Less than a month till the deadline to apply for this PhD place!
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RTÉ News @news.rte.ie · 18/04/2025
The Minister for Heritage has announced that the Historic Astronomical Observatories of Ireland have been added to the World Heritage Tentative List, in a bid to become a UNESCO World Heritage Site
rte.ie
Irish historical observatories seek UNESCO status
The Minister for Heritage has announced that the Historic Astronomical Observatories of Ireland have been added to the World Heritage Tentative List, in a bid to become a UNESCO World Heritage Site.
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Johanna Vos @johannavos.bsky.social · 10/04/2025
Looking forward to speaking at the @royalastrosoc.bsky.social Highlights Meeting tomorrow at @ria.ie 🔭☘️ Free tickets available here: ras.ac.uk/events-and-m...
ras.ac.uk
April A&G Highlights Meeting
RAS Meetings | Friday, 11 of April 2025 - 16:00 | April A&G Highlights Meeting
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ESA Space Science @science.esa.int · 27/03/2025
The moment has come to say goodbye to Gaia! 🥹
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Johanna Vos @johannavos.bsky.social · 03/03/2025
Check out our newest results from JWST, led by @alliemccarthy.bsky.social and published today in ApJ Letters! 🔭🪐
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Evert Nasedkin @evertnasedkin.bsky.social · 25/02/2025
🔭 Interested in exoplanet and brown dwarf atmospheres? 🪐Just want to come visit Ireland this summer? Submit an abstract to our symposium at #EAS2025, New Frontiers in Characterising Gas-Giant Exoplanets and Brown Dwarfs! The deadline is less than two weeks away! eas.unige.ch/EAS_meeting/...
eas.unige.ch
EAS 2025
European Astronomical Society Annual Meeting 2024
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Alexandra Witze @alexwitze.bsky.social · 07/01/2025
➡️ Science journalism job alert! Nature has a rare opening for a staff reporter, based in Berlin or Sydney. I know the cities are weirdly selective, but this position will join either the news team's European bureau or its Asia-Pacific bureau. Apply by Jan 20: lnkd.in/gCQjc-iE
lnkd.in
Nature Portfolio hiring (Senior) Reporter (m/w/d) in Berlin, Berlin, Germany | LinkedIn
Posted 2:10:43 PM. Job Title: (Senior) Reporter (m/w/d)Locations: Berlin or Syndey – hybrid working model; full time…See this and similar jobs on LinkedIn.
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Johanna Vos @johannavos.bsky.social · 04/01/2025
Just a couple more days to apply to join our group @tcddublin.bsky.social!
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Luca Matrà @lucaroundtheworld.bsky.social · 03/12/2024
🚨🔔 Job alert 🔔 🚨 ERC positions in our E-BEANS team @tcddublin.bsky.social ☘️ on exoplanetary systems (disks/long period planets/volatile delivery), starting Sep ‘25! ☄️🪐💿 🔭 3-yr Fellow: tinyurl.com/5n77ucnk 4-yr PhD: tinyurl.com/bdb3xyp3 Deadline Jan 6th ⏰ Please spread the word!
aas.org
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Johanna Vos @johannavos.bsky.social · 02/12/2024
🚨🚨 I'm hiring!!! 🚨🚨 Postdoc and PhD positions available to join my ERC project Exo-PEA at @tcddublin.bsky.social. The project aims to understand weather in giant extrasolar worlds ☁️⚡🪐 📆 Deadline: Jan 6th Postdoc ad: tinyurl.com/2ufcwvxf PhD ad: tinyurl.com/5amcea6p Please share widely! 🔭🪐
tinyurl.com
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Johanna Vos @johannavos.bsky.social · 29/11/2024
There is an exciting PhD position available at @diasdublin.bsky.social in the area of planetary magnetospheres and habitable moons with ESA's JUICE mission 🪐🌑☘️ The deadline is TOMORROW and full details are here: www.dias.ie/phd-position... Please share! 🪐🔭
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Philip Muirhead @philipmuirhead.bsky.social · 26/11/2024
Check out BU PhD-student @alliemccarthy.bsky.social's paper just accepted to ApJL! JWST spectral light curves of SIMP 0136 show clear pressure-dependence, indicating three variability mechanisms: clouds, hot spots and C chemistry. @johannavos.bsky.social is the JWST PI! arxiv.org/abs/2411.16577
arxiv.org
The JWST Weather Report from the Isolated Exoplanet Analog SIMP 0136+0933: Pressure-Dependent Variability Driven by Multiple Mechanisms
Isolated planetary-mass objects share their mass range with planets but do not orbit a star. They lack the necessary mass to support fusion in their cores and thermally radiate their heat from formati...
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Professor Carole Mundell @cmundell.esa.int · 22/11/2024
✅The 2025 ESA internship opportunities are now live! Positions are open in a wide range of fields, including engineering, space science, IT, natural and social sciences, business, economics, and administrative services.🚀 www.esa.int/About_Us/Car...
esa.int
Space is closer than you think: apply now to the ESA Student Internship Programme
The 2025 ESA internship opportunities are now live! Positions are open in a wide range of fields, including engineering, science, IT, natural and social sciences, business, economics, and administrati...
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Johanna Vos @johannavos.bsky.social · 23/01/2024
🚨🚨 PhD Position in Extrasolar Atmospheres 🚨🚨 I'm looking for a PhD student to join my group at Trinity College Dublin to investigate weather on imaged worlds beyond our solar system ⚡☁️🪐 ⏰ Deadline: Feb 20th 📝 Job Ad: tinyurl.com/2jfycpfx Please share widely!
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Johanna Vos @johannavos.bsky.social · 20/11/2023
🚨🚨I'm hiring !!🚨🚨 I’m looking for a Research Fellow to join my team at Trinity College Dublin to work on Extrasolar Atmospheres ☘️🪐☁️🔭 Deadline: December 31st  Ad: jobregister.aas.org/ad/c1a19f23 Please share widely!
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Johanna Vos @johannavos.bsky.social · 01/09/2023
I am so delighted to be starting as Assistant Professor in the School of Physics at Trinity College Dublin today! Feeling so grateful to the wonderful mentors, collaborators and friends who helped to get me here. You know who you are! 💫
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Johanna Vos @johannavos.bsky.social · 28/07/2023
I’m here now! 👋🏼
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