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Phil Armitage

@philip-armitage.bsky.social
43 followers 19 following 13 posts

Astrophysicist at Flatiron CCA & Stony Brook working on accretion and planet formation. Also Mr. Pisconti / Nico’s dad / hiker / Zwifter / (lapsed) photographer

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Phil Armitage @philip-armitage.bsky.social · 25/09/2026
New paper! In work led by Thomas Pfeil @flatironinstitute.org, we perform protoplanetary disk turbulence simulations that include the effects of dust coagulation. We show that the Vertical Shear Instability weakens with time, consistent with observations. arxiv.org/abs/2609.28618
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Phil Armitage @philip-armitage.bsky.social · 07/04/2026
In work led by Alessandro Ruzza as part of the exoALMA project, we use the Simulation-Based Inference tool DBNets2.0 to estimate the masses of planets that would generate the observed substructure seen in dust continuum images of protoplanetary disks. arxiv.org/abs/2603.13149
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Phil Armitage @philip-armitage.bsky.social · 14/01/2026
This might be subtitled “Skeletons from the N-body closet”! (shamelessly borrowing from Salmon and Warren). A reminder that even the “simplest” computational astrophysics problem has a great deal of depth and subtlety.
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Phil Armitage @philip-armitage.bsky.social · 23/12/2025
New paper! In work led by Matteo Cantiello @flatironinstitute.org we predict an instability strip for quasi-stars, which we argue is consistent with the observed variability properties of JWST’s Little Red Dots. arxiv.org/abs/2512.17997
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Phil Armitage @philip-armitage.bsky.social · 22/10/2025
New paper, led by Jake Hassan, on the structure and evolution of quasi-stars: accreting black holes embedded in massive envelopes. This is a model for the growth of black hole seeds, and, maybe 🤞, for JWSTs “Little Red Dots”. Time will tell… arxiv.org/abs/2510.18301
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Reposted by Phil Armitage
AstroArxiv @astroarxiv.bsky.social · 09/10/2025
Polka-dotted Stars II: Starspots and obliquities of Kepler-17 and Kepler-63. Sabina Sagynbayeva et. al. arxiv.org/abs/2510.07130
Figure 1Figure 2Figure 3Figure 4
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Phil Armitage @philip-armitage.bsky.social · 30/07/2025
With Navin Tsung and collaborators, we show how magnetic fields can effectively suppress gravitational instability and fragmentation in AGN accretion disks. arxiv.org/abs/2507.21991
arxiv.org
Does magnetic field promote or suppress fragmentation in AGN disks? Results from local shearing box simulations with simple cooling
Accretion disks in Active Galactic Nuclei (AGN) are predicted to become gravitationally unstable substantially interior to the black hole's sphere of influence, at radii where the disk is simultaneous...
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Reposted by Phil Armitage
Dr. Jessie Christiansen @aussiastronomer.bsky.social · 30/07/2025
A timely paper for #HWO25: is it enough to find Earth-like planets around other nearby stars? No! We need their planetary system contexts. Does life on Earth depend on Jupiter? @sabinastro.bsky.social led this nice analysis of HWO requirements to detect Earths + Jupiters. arxiv.org/abs/2507.21443
arxiv.org
Requirements for Joint Orbital Characterization of Cold Giants and Habitable Worlds with Habitable Worlds Observatory
We determine optimal requirements for the joint detection of habitable-zone planets and cold giant planets with the Habitable Worlds Observatory (HWO). Analysis of 164 nearby stars shows that a corona...
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Reposted by Phil Armitage
Dada Pisconti @dadapisconti.bsky.social · 15/07/2025
Me and hubby discussing the new LIGO discovery of ginormous merging black holes. Me to 3 yo: Nico, do you like black holes? 3 yo: No, I like YouTube. Hubby: well, that's kinda a hybrid black/white hole: light comes out but no information 🤣 Happy #NerdyTuesday! 🧪 @philip-armitage.bsky.social
nature.com
Monster black hole merger is biggest ever seen
Gravitational wave detector LIGO spots fast-spinning ‘forbidden’ black holes that challenge physics models.
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Phil Armitage @philip-armitage.bsky.social · 16/06/2025
In work led by Alessandro Ruzza, we use a new simulation-based inference approach to estimate masses of disk embedded planets from ALMA data. arxiv.org/abs/2506.11200
arxiv.org
DBNets2.0: simulation-based inference for planet-induced dust substructures in protoplanetary discs
Dust substructures in protoplanetary discs can be signatures of embedded young planets whose detection and characterisation would provide a better understanding of planet formation. Traditional techni...
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Phil Armitage @philip-armitage.bsky.social · 27/05/2025
From today’s ethics training I learned that the threshold for a nominal gift in New York State is $15. The temptation to ask about jumbo jets was strong…
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Phil Armitage @philip-armitage.bsky.social · 23/05/2025
Thread on our simulation work on circumplanetary disks, led by @sabinastro.bsky.social with Alexandra Kuznetsova and Yan-Fei Jiang from @flatironinstitute.org. We’re working to understand when such disks form, and what their structure looks like as we zoom in closer to the planet.
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Reposted by Phil Armitage
Dada Pisconti @dadapisconti.bsky.social · 18/05/2025
😂🤣
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Reposted by Phil Armitage
Dada Pisconti @dadapisconti.bsky.social · 24/04/2025
If you too are experiencing mental health issues due to the ongoing shitshow, please DM me or Signal me at ziadadina.19, I am trying to build a community to help each other. Y'all, please repost and help me out, this is serious stuff
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Phil Armitage @philip-armitage.bsky.social · 14/04/2025
Revised version of a new, short (-ish!) review on planet formation theory: arxiv.org/abs/2412.11064
arxiv.org
Planet formation theory: an overview
The standard model for planet formation is a bottom-up process in which the origin of rocky and gaseous planets can be traced back to the collision of micron-sized dust grains within the gas-rich envi...
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Reposted by Phil Armitage
Richard Alexander @richardalexander.bsky.social · 11/04/2025
New paper, led by the amazing @becastro.bsky.social (with Jeremy Smallwood, Andrew Winter, @astrohoss.bsky.social, and others). In which we try to understand the formation of the crazy-looking young planetary system IRAS04125... 🤔 🔭 arxiv.org/abs/2504.07182
arxiv.org
Disc-planet misalignment from an unstable triple system: IRAS04125
The IRAS01425+2902 wide binary system was recently reported to have both a young planet and a puzzling geometric arrangement, where the planet and binary both orbit edge-on, but misaligned by 60 deg t...
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Phil Armitage @philip-armitage.bsky.social · 11/04/2025
Daniel Carrera, Linn Eriksson and collaborators study a “hybrid” mode of planetesimal formation, in which the growth of dust in vortices ultimately drives the system into the collapse regime of streaming instability parameter space. arxiv.org/abs/2504.06332
arxiv.org
Positive Feedback II: How Dust Coagulation inside Vortices Can Form Planetesimals at Low Metallicity
The origin of planetesimals ($\sim$100 km planet building blocks) has confounded astronomers for decades, as numerous growth barriers appear to impede their formation. In a recent paper we proposed a ...
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