Theoretical astrophysics and plasma physics at RPC

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Electromagnetic instabilities and plasma turbulence driven by electron-temperature gradient

JOURNAL OF PLASMA PHYSICS 88:4 (2022) ARTN 905880410

Authors:

T Adkins, AA Schekochihin, PG Ivanov, CM Roach
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New linear stability parameter to describe low-$\beta$ electromagnetic microinstabilities driven by passing electrons in axisymmetric toroidal geometry

(2022)

Authors:

MR Hardman, FI Parra, BS Patel, CM Roach, J Ruiz Ruiz, M Barnes, D Dickinson, W Dorland, JF Parisi, D St-Onge, H Wilson
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On the asymptotic behaviour of cosmic density-fluctuation power spectra of cold dark matter

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 515:4 (2022) 5823-5835

Authors:

Sara Konrad, Yonadav Barry Ginat, Matthias Bartelmann
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Are Dipolarization Fronts a Typical Feature of Magnetotail Plasma Jets Fronts?

ArXiv 2208.10333 (2022)

Authors:

L Richard, Yu V Khotyaintsev, DB Graham, CT Russell
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The Gaia-ESO Public Spectroscopic Survey: Motivation, implementation, GIRAFFE data processing, analysis, and final data products

Astronomy & Astrophysics EDP Sciences 666 (2022) A120-A120

Authors:

G Gilmore, S Randich, CC Worley, A Hourihane, A Gonneau, GG Sacco, JR Lewis, L Magrini, P François, RD Jeffries, SE Koposov, A Bragaglia, EJ Alfaro, C Allende Prieto, R Blomme, AJ Korn, AC Lanzafame, E Pancino, A Recio-Blanco, R Smiljanic, S Van Eck, T Zwitter, T Bensby, E Flaccomio, MJ Irwin, J Binney

Abstract:

We present a machine learning method to assign stellar parameters (temperature, surface gravity, metallicity) to the photometric data of large photometric surveys such as SDSS and SKYMAPPER. The method makes use of our previous effort in homogenizing and recalibrating spectroscopic data from surveys like APOGEE, GALAH, or LAMOST into a single catalog, which is used to inform a neural network. We obtain spectroscopic-quality parameters for millions of stars that have only been observed photometrically. The typical uncertainties are of the order of 100K in temperature, 0.1 dex in surface gravity, and 0.1 dex in metallicity and the method performs well down to low metallicity, were obtaining reliable results is known to be difficult
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