Andrew Sellek
@andrewsellek.bsky.social
Postdoc at Leiden Sterrewacht researching protoplanetary discs with interests in photoevaporation (internal & external), dust evolution & astrochemistry.
Website: andrewsellek.com
Website: andrewsellek.com
With just under 12 hours to go, here's how JWST Cycle 5 proposal submissions are progressing according to our sampling of the star and planet formation people here in Leiden! We're well past the 1000 mark for the year (and 10,000 across all years!) now, but where will we end up?
October 15, 2025 at 12:29 PM
With just under 12 hours to go, here's how JWST Cycle 5 proposal submissions are progressing according to our sampling of the star and planet formation people here in Leiden! We're well past the 1000 mark for the year (and 10,000 across all years!) now, but where will we end up?
Reposted by Andrew Sellek
Another MINDS JWST paper! We explore the stark transition from H2O-dominated spectra in Sun-like systems to the carbon-rich chemistry seen for low-mass objects. We don't know exactly what is driving this trend, but we explore the possibilities that may be acting in concert.
arxiv.org/pdf/2508.04692
arxiv.org/pdf/2508.04692
August 7, 2025 at 3:33 PM
Another MINDS JWST paper! We explore the stark transition from H2O-dominated spectra in Sun-like systems to the carbon-rich chemistry seen for low-mass objects. We don't know exactly what is driving this trend, but we explore the possibilities that may be acting in concert.
arxiv.org/pdf/2508.04692
arxiv.org/pdf/2508.04692
Reposted by Andrew Sellek
New MINDS paper from Nicolas Kurtovic, focused on binary systems. Spectra, extended emission, variability, multi-observatory analysis -- there's something for everyone!
arxiv.org/pdf/2508.02576
arxiv.org/pdf/2508.02576
August 5, 2025 at 6:49 PM
New MINDS paper from Nicolas Kurtovic, focused on binary systems. Spectra, extended emission, variability, multi-observatory analysis -- there's something for everyone!
arxiv.org/pdf/2508.02576
arxiv.org/pdf/2508.02576
Based on a recent workshop series, hosted by Giovanni Rosotti, @cfmanara.bsky.social, Tom Haworth, and Megan Reiter, we summarised in @ojastro.bsky.social the latest results on a growing topic in protoplanetary discs - the role of external irradiation - and how we hope to answer the open questions:
New Publication at the Open Journal of Astrophysics: "The past, present and future of observations of externally irradiated disks" by Planet formation environments collaboration: Megan Allen (U. Sheffield, UK) and 52 others
doi.org/10.33232/001...
doi.org/10.33232/001...
The past, present and future of observations of externally irradiated disks | Published in The Open Journal of Astrophysics
By Planet formation environments collaboration, Megan Allen & 52 more. A review of research on the effects of the ultraviolet radiation environment on protoplanetary disc evolution and planet formatio...
doi.org
May 2, 2025 at 4:15 PM
Based on a recent workshop series, hosted by Giovanni Rosotti, @cfmanara.bsky.social, Tom Haworth, and Megan Reiter, we summarised in @ojastro.bsky.social the latest results on a growing topic in protoplanetary discs - the role of external irradiation - and how we hope to answer the open questions:
Reposted by Andrew Sellek
Super proud of my PhD student Osmar who discovered that the so-called 'compact disks' around young stars are REALLY REALLY small! Look at the full sample of Lupus disks, observed at 30 mas resolution with ALMA.
Protoplanetary discs are much smaller than previously thought
www.astronomie.nl
March 26, 2025 at 7:17 AM
Super proud of my PhD student Osmar who discovered that the so-called 'compact disks' around young stars are REALLY REALLY small! Look at the full sample of Lupus disks, observed at 30 mas resolution with ALMA.
Reposted by Andrew Sellek
I used to do science outreach with a group called CHaOS (see link!). We’d often ask kids to draw a scientist at the start and end of our sessions.
They’d often go from drawing an Einstein-esque mad scientist, to someone who looked at lot like themselves (or perhaps one of us) 😊
#AcademicChatter
They’d often go from drawing an Einstein-esque mad scientist, to someone who looked at lot like themselves (or perhaps one of us) 😊
#AcademicChatter
February 11, 2025 at 6:03 PM
I used to do science outreach with a group called CHaOS (see link!). We’d often ask kids to draw a scientist at the start and end of our sessions.
They’d often go from drawing an Einstein-esque mad scientist, to someone who looked at lot like themselves (or perhaps one of us) 😊
#AcademicChatter
They’d often go from drawing an Einstein-esque mad scientist, to someone who looked at lot like themselves (or perhaps one of us) 😊
#AcademicChatter
Reposted by Andrew Sellek
Congrats to my student Chengyan Xie 🎉 for his work analyzing Spitzer+JWST data on T Cha! 🌟 He uncovered dramatic changes in the star’s disk—inner disk eroding in an outburst, reshaping IR emission. This object deserves follow-up! 🪐✨ #JWST iopscience.iop.org/article/10.3...
iopscience.iop.org
January 21, 2025 at 5:26 PM
Congrats to my student Chengyan Xie 🎉 for his work analyzing Spitzer+JWST data on T Cha! 🌟 He uncovered dramatic changes in the star’s disk—inner disk eroding in an outburst, reshaping IR emission. This object deserves follow-up! 🪐✨ #JWST iopscience.iop.org/article/10.3...
Reposted by Andrew Sellek
The accepted version of my SY Cha winds paper is now on arXiv: arxiv.org/abs/2409.11176! And if you are at #AAS245 I will discuss the results TODAY at 2 pm in Potomac 3-4 🧪🔭
January 15, 2025 at 1:19 PM
The accepted version of my SY Cha winds paper is now on arXiv: arxiv.org/abs/2409.11176! And if you are at #AAS245 I will discuss the results TODAY at 2 pm in Potomac 3-4 🧪🔭
The latest protoplanetary disk study by the MINDS collaboration using JWST-MIRI is out now! arxiv.org/abs/2412.127... Led by Leiden PhD student Marissa Vlasblom, it focusses on CX Tau, a disk for which the dust emission is much more compact than gas, suggesting dust grains have drifted inwards. 1/4
December 18, 2024 at 11:54 AM
The latest protoplanetary disk study by the MINDS collaboration using JWST-MIRI is out now! arxiv.org/abs/2412.127... Led by Leiden PhD student Marissa Vlasblom, it focusses on CX Tau, a disk for which the dust emission is much more compact than gas, suggesting dust grains have drifted inwards. 1/4
Reposted by Andrew Sellek
JWST MIRI has revealed that disks around very low-mass stars are hydrocarbon-rich but water-poor in the inner disk (Aditya Arabhavi). Result of dust traps? What are the implications for planets forming here? #NOVA25
December 12, 2024 at 1:16 PM
JWST MIRI has revealed that disks around very low-mass stars are hydrocarbon-rich but water-poor in the inner disk (Aditya Arabhavi). Result of dust traps? What are the implications for planets forming here? #NOVA25
It's paper day! arxiv.org/abs/2412.01895 JWST is studying the molecular contents of the inner regions of protoplanetary discs in unprecented detail, and they turn out to be very varied. Some discs, eg DR Tau, are dominated by emission from water, others, eg GW Lup, are dominated by CO2. But why? 1/6
December 4, 2024 at 5:54 PM
It's paper day! arxiv.org/abs/2412.01895 JWST is studying the molecular contents of the inner regions of protoplanetary discs in unprecented detail, and they turn out to be very varied. Some discs, eg DR Tau, are dominated by emission from water, others, eg GW Lup, are dominated by CO2. But why? 1/6