Phil Armitage

@philip_armitage

Astrophysicist at Flatiron CCA & Stony Brook / Mr. Pisconti / Photographer and Traveller / Hiker and (lapsed) Runner

New York
Vrijeme pridruživanja: travanj 2016.

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  1. 29. sij

    Planetesimal formation may need a chain of processes to concentrate solid material: zonal flows, vortices, the streaming instability... If so, the efficiency goes down (may be OK observationally), and there may be places where planetesimals can't form at all.

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  2. 29. sij

    Big picture: I still think the streaming instability is the best candidate planetesimal formation mechanism. But both analytic and simulation evidence now suggests that while the streaming instability is unavoidable, reaching conditions for gravitational collapse is non-trivial.

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  3. 29. sij

    Main difference compared to most prior work: we use small domains and force fluid turbulence with specified properties. This allows 10-100x better spatial resolution, at the expense of capturing large-scale structure in the turbulence (which may well be important).

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  4. 29. sij

    New paper! In work led by Dan Gole, we find that modest levels of protoplanetary disk turbulence stop solids from collapsing into planetesimals. We think turbulence is strong close to the star, so this may hinder in situ formation of close-in exoplanets.

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  5. 28. sij

    Note to authors: we require informative paper titles, and now also discourage "clever" ones. Thinking is that puns and plays on words are hard for non-native speakers, while allusions to current events age poorly. Even though they can be, admittedly, fun!

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    21. sij

    Graduate students studying dynamics and galactic structure: spend the summer in NYC at the CCA summer school. Applications due Feb 15:

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  7. 19. sij

    The planet formation group is exploring different approaches to understand how small solid particles grow in turbulent protoplanetary disks. Dan Gole uses direct simulations, at resolutions up to 512^2 x 2048, to study planetesimal formation.

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    3. sij

    Reminder: We are running an Applied Galactic Dynamics school this July at the Applications are due by 15 Feb 2020!

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  9. 26. pro 2019.

    Searching for papers by (Fred) Hoyle, see that "Cosmological parameters from SDSS and WMAP" (2005, co-author Fiona Hoyle) now has more citations than Margaret Burbidge's classic "Synthesis of the Elements in Stars" (1957, co-author Fred Hoyle). Precision cosmology ascendant...

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  10. 19. pro 2019.

    An end of year thank you to the authors who chose to submit papers on planet formation, protoplanetary disks, codes, and accretion to . To the colleagues who generously accepted my "invitations" to review them, beers are on me if you're passing through New York!

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  11. 17. pro 2019.

    Work led by Xinyu Li , with colleagues and , looking at changes to Bondi-Hoyle-Lyttleton accretion and dynamical friction from outflows (spherical or jet-like). These effects may matter for common envelope evolution.

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  12. 13. pro 2019.

    Standing room only to hear Volker Springel talk on the state of galaxy formation simulations

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  13. 10. pro 2019.

    First of their kind simulations from Zhaohuan Zhu, Yan-Fei Jiang (), and Jim Stone, modeling FU Orionis outbursts in disks around young stars with radiation and magnetic fields

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  14. 3. pro 2019.

    Received three emails asking for letters / nominations / reviews while waiting in the doctors' office for my annual physical. Poisson statistics is not good for blood pressure!

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  15. 22. lis 2019.

    Sebastian Perez showing predicted kinematic signatures of planets at the workshop this week. Great discussions!

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  16. 17. lis 2019.

    Excited to learn more about a topic I’ve been following but don’t work on!

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  17. 17. lis 2019.

    This is a rapidly advancing field that promises to give direct info both on when and where giant planets form AND how they interact with gas disks. There are theory and data analysis challenges but a lot of potential.

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  18. 17. lis 2019.

    Looking forward to welcoming visitors to our workshop “Visualizing the kinematics of planet formation” next week. We’ll be discussing progress / prospects for protoplanet detection via gas disk kinematic data.

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  19. 17. lis 2019.

    Wrapping up our first TCAN collaboration meeting in Tucson with a short hike. Saguaros are really cool!

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  20. 8. lis 2019.

    For the first 2 years of grad school I knew the work of Michel Mayor well... for the Duquennoy & Mayor paper on the binary star population. Painstaking work, celebrated in the field but not in the public eye, that laid the groundwork for the 51 Peg discovery.

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