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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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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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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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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. https://arxiv.org/abs/2001.10000
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Note to
#mnras 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!Hvala. Twitter će to iskoristiti za poboljšanje vaše vremenske crte. PoništiPoništi -
Phil Armitage proslijedio/la je Tweet
Graduate students studying dynamics and galactic structure: spend the summer in NYC at the CCA summer school. Applications due Feb 15: http://galacticdynamics.nyc
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The planet formation group
@FlatironCCA 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.pic.twitter.com/3lFUArRrZ4
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Phil Armitage proslijedio/la je Tweet
Reminder: We are running an Applied Galactic Dynamics school this July at the
@FlatironCCA Applications are due by 15 Feb 2020! http://galacticdynamics.nyc#AAS235Hvala. Twitter će to iskoristiti za poboljšanje vaše vremenske crte. PoništiPoništi -
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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An end of year thank you to the authors who chose to submit papers on planet formation, protoplanetary disks, codes, and accretion to
#MNRAS. To the colleagues who generously accepted my "invitations" to review them, beers are on me if you're passing through New York!Hvala. Twitter će to iskoristiti za poboljšanje vaše vremenske crte. PoništiPoništi -
Work led by Xinyu Li
@CITA_ICAT, with colleagues@FlatironCCA and@uoftastro, 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. https://arxiv.org/abs/1912.06864Hvala. Twitter će to iskoristiti za poboljšanje vaše vremenske crte. PoništiPoništi -
Standing room only to hear Volker Springel talk on the state of galaxy formation simulations
@FlatironCCApic.twitter.com/ZuNQED222K
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First of their kind simulations from Zhaohuan Zhu, Yan-Fei Jiang (
@FlatironCCA), and Jim Stone, modeling FU Orionis outbursts in disks around young stars with radiation and magnetic fields https://arxiv.org/abs/1912.01632Hvala. Twitter će to iskoristiti za poboljšanje vaše vremenske crte. PoništiPoništi -
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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Sebastian Perez showing predicted kinematic signatures of planets at the
@FlatironCCA workshop this week. Great discussions!pic.twitter.com/0Ugw3X5nQL
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Excited to learn more about a topic I’ve been following but don’t work on!
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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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Looking forward to welcoming visitors to our workshop “Visualizing the kinematics of planet formation”
@FlatironCCA next week. We’ll be discussing progress / prospects for protoplanet detection via gas disk kinematic data.Prikaži ovu nitHvala. Twitter će to iskoristiti za poboljšanje vaše vremenske crte. PoništiPoništi -
Wrapping up our first TCAN collaboration meeting in Tucson with a short hike. Saguaros are really cool!pic.twitter.com/2AOPVB3CFl
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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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