Prof Sergei Nayakshin

Professor in Theoretical Astrophysics

Room G24e, Physics main building

Tel: +44 (0)116 252 2454

Email: sn85@le.ac.uk

Personal details

Originally from Russia, I obtained my undergraduate degree in Theoretical Nuclear Physics from the Moscow Engineering Physics Institute in 1993. I completed a PhD in Theoretical Astrophysics in 1998 at the University of Arizona, Tucson, specialising in accretion flows around compact objects. From 1999 to 2001, I was a National Research Council Fellow at the NASA/Goddard Space Flight Centre at Maryland, USA. I then held a Postdoctoral Researcher position in the group of Professor Rashid Sunyaev at the Max Plank Institute for Astrophysics in Garching bei Munich, Germany. I joined the University of Leicester in 2005 as a Lecturer. I am now a full Professor.

 

Research

My research interests revolve around the physics of accreting objects (e.g. black holes, protostars and proto-planets). Over the years, I have focused specifically on

  • geometry and emission mechanism of the innermost regions of accreting black holes (e.g, Nayakshin, Kazanas & Kallman 2000)
  • gravitational instabilities and extreme star formation on sub-parsec scales around supermassive black holes, especially in Sgr A* (Nayakshin & Sunyaev 2006Paumard et al 2006, Nayakshin et al 2007).
  • Supermassive black hole feeding and  feedback in general and in our Galaxy (the Fermi Bubbles) in particular (Hobbs et al 2011, Zubovas, King & Nayakshin 2011).
  • Planet formation, specifically the role of planet migration -- shrinking of planet orbit due to planet-gas disc interactions. The process of planet migration revolutionised the classical Core Accretion model about 20 years ago (Lin et al 1996). In the last decade, numerical simulations showed that massive giant planets may "super-migrate" -- migrate to the location where hot Jupiters are observed (0.03 astronomical units, au) from as much as 100 au (Boley et al 2010). This implies that the second classical theory, Gravitational Instability, may also result in formation of hot Jupiters and all the other type of planets. I am pursuing development and critical testing of this new scenario for planet formation, which I recently reviewed here.

Past and current PhD students

  • Jorge Cuadra, Associate Professor, Santiago, Chile
  • Alex Hobbs, Postdoctoral Fellow, University of Zurich
  • Kastytis Zubovas, faculty at Center for Physical Sciences and Technology, Vilnius, Lithuania
  • Martin Bourne, Postdoctoral Researcher at the Kavli Institute for Astronomy, Cambridge University
  • Mark Fletcher, 3rd year PhD student
  • Jack Humphries, 1st year PhD student

Teaching

  • PA3250, Further Mathematical Physics
  • PA4622, Statistical Mechanics
  • Module coordinator for PA4440, Advanced Study Project
  • PA7081, Practical Programming
  • In the past --  PA113 (Electricity and Magnetism); Fractals and Chaos; Extreme Stars.

Office hours

9.00am to 5.00pm, Monday-Friday

Selected Publications

Papers (from 2010 to early 2014)

    2014

  • Nayakshin S., Two-phase model for black hole feeding and feedback Monthly Notices of the Royal Astronomical Society (2014) 437:2404-2411 (Journal article) DOI for this publication

2013

  • Bourne M. A., Nayakshin S., Inverse Compton X-ray signature of AGN feedback Monthly Notices of the Royal Astronomical Society (2013) 436:2346-2351 (Journal article) DOI for this publication
  • Nayakshin S., Cha S.-H., Radiative feedback from protoplanets in self-gravitating protoplanetary discs Monthly Notices of the Royal Astronomical Society (2013) 435:2099-2108 (Journal article) DOI for this publication
  • Neilsen J., et al., A Chandra/HETGS Census of X-Ray Variability from Sgr A* during 2012 The Astrophysical Journal (2013) 774:42- (Journal article) DOI for this publication
  • Wang Q. D., et al., Dissecting X-ray–Emitting Gas Around the Center of Our Galaxy Science (2013) 341:981-983 (Journal article) DOI for this publication
  • Zubovas K., Nayakshin S., King A., Wilkinson M., AGN outflows trigger starbursts in gas-rich galaxies Monthly Notices of the Royal Astronomical Society (2013) 433:3079-3090 (Journal article) DOI for this publication
  • Nayakshin S., Wilkinson M. I., A link between feedback outflows and satellite galaxy suppression Monthly Notices of the Royal Astronomical Society (2013) 433:324-331 (Journal article) DOI for this publication
  • Nayakshin S., Hydrogen-losing planets in transition discs around young protostars Monthly Notices of the Royal Astronomical Society (2013) 431:1432-1438 (Journal article) DOI for this publication
  • Zubovas K., Nayakshin S., Sazonov S., Sunyaev R., Outflows of stars due to quasar feedback Monthly Notices of the Royal Astronomical Society (2013) 431:793-798 (Journal article) DOI for this publication

2012

  • Nayakshin S., Zubovas K., Quasar feedback: accelerated star formation and chaotic accretion Monthly Notices of the Royal Astronomical Society (2012) 427:372-378 (Journal article) DOI for this publication
  • Nayakshin S., Lodato G., Fu Ori outbursts and the planet-disc mass exchange Monthly Notices of the Royal Astronomical Society (2012) 426:70-90 (Journal article) DOI for this publication
  • Bridges J. C., Changela H. G., Nayakshin S., Starkey N. A., Franchi I. A., Chondrule fragments from Comet Wild2: Evidence for high temperature processing in the outer Solar System Earth and Planetary Science Letters (2012) 341:186-194 (Journal article) DOI for this publication
  • Zubovas K., Nayakshin S., Fermi bubbles in the Milky Way: the closest AGN feedback laboratory courtesy of Sgr A*? Monthly Notices of the Royal Astronomical Society (2012) 424:666-683 (Journal article) DOI for this publication
  • Nayakshin S., Cha S.-H., An alternative origin for debris rings of planetesimals Monthly Notices of the Royal Astronomical Society (2012) 423:2104-2119 (Journal article) DOI for this publication
  • Nayakshin S., Power C., King A. R., The Observed M-σ Relations Imply That Super-massive Black Holes Grow by Cold Chaotic Accretion The Astrophysical Journal (2012) 753:15- (Journal article) DOI for this publication
  • Hobbs A., Power C., Nayakshin S., King A. R., Modelling supermassive black hole growth: towards an improved sub-grid prescription Monthly Notices of the Royal Astronomical Society (2012) 421:3443-3449 (Journal article) DOI for this publication
  • Zubovas K., Nayakshin S., Markoff S., Sgr A* flares: tidal disruption of asteroids and planets? Monthly Notices of the Royal Astronomical Society (2012) 421:1315-1324 (Journal article) DOI for this publication
  • Alexander R. D., Smedley S. L., Nayakshin S., King A. R., Galactic Centre star formation: the case of the missing gas disc Monthly Notices of the Royal Astronomical Society (2012) 419:1970-1976 (Journal article) DOI for this publication
  • Nayakshin S., Sazonov S., Sunyaev R., Are supermassive black holes shrouded by 'super-Oort' clouds of comets and asteroids? Monthly Notices of the Royal Astronomical Society (2012) 419:1238-1247 (Journal article) DOI for this publication

2011

  • Nayakshin S., Hot Super Earths: disrupted young jupiters? Monthly Notices of the Royal Astronomical Society (2011) 416:2974-2980 (Journal article) DOI for this publication
  • Nayakshin S., Cha S.-H., Bridges J. C., The tidal downsizing hypothesis for planet formation and the composition of Solar system comets Monthly Notices of the Royal Astronomical Society (2011) 416:L50-L54 (Journal article) DOI for this publication
  • Cha S.-H., Nayakshin S., A numerical simulation of a 'Super-Earth' core delivery from ˜100 to ˜8 au Monthly Notices of the Royal Astronomical Society (2011) 415:3319-3334 (Journal article) DOI for this publication
  • Bloom J. S., et al., A Possible Relativistic Jetted Outburst from a Massive Black Hole Fed by a Tidally Disrupted Star Science (2011) 333:203- (Journal article) DOI for this publication
  • Zubovas K., King A. R., Nayakshin S., The Milky Way's Fermi bubbles: echoes of the last quasar outburst? Monthly Notices of the Royal Astronomical Society (2011) 415:L21-L25 (Journal article) DOI for this publication
  • Hobbs A., Nayakshin S., Power C., King A., Feeding supermassive black holes through supersonic turbulence and ballistic accretion Monthly Notices of the Royal Astronomical Society (2011) 413:2633-2650 (Journal article) DOI for this publication
  • Power C., Zubovas K., Nayakshin S., King A. R., Self-regulated star formation and the black hole-galaxy bulge relation Monthly Notices of the Royal Astronomical Society (2011) 413:L110-L113 (Journal article) DOI for this publication
  • Nayakshin S., Formation of terrestrial planet cores inside giant planet embryos Monthly Notices of the Royal Astronomical Society (2011) 413:1462-1478 (Journal article) DOI for this publication
  • Power C., Nayakshin S., King A., The accretion disc particle method for simulations of black hole feeding and feedback Monthly Notices of the Royal Astronomical Society (2011) 412:269-276 (Journal article) DOI for this publication
  • Nayakshin S., Rotation of the Solar system planets and the origin of the Moon in the context of the tidal downsizing hypothesis Monthly Notices of the Royal Astronomical Society (2011) 410:L1-L5 (Journal article) DOI for this publication

2010

  • Nayakshin S., Grain sedimentation inside giant planet embryos Monthly Notices of the Royal Astronomical Society (2010) 408:2381-2396 (Journal article) DOI for this publication
  • Nayakshin S., Formation of planets by tidal downsizing of giant planet embryos Monthly Notices of the Royal Astronomical Society (2010) 408:L36-L40 (Journal article) DOI for this publication
  • Cha S.-H., Inutsuka S.-I., Nayakshin S., Kelvin-Helmholtz instabilities with Godunov smoothed particle hydrodynamics Monthly Notices of the Royal Astronomical Society (2010) 403:1165-1174 (Journal article) DOI for this publication
  • Nayakshin S., Power C., Simulations of momentum feedback by black hole winds Monthly Notices of the Royal Astronomical Society (2010) 402:789-802 (Journal article) DOI for this publication
  • Bartko H., et al., An Extremely Top-Heavy Initial Mass Function in the Galactic Center Stellar Disks The Astrophysical Journal (2010) 708:834-840 (Journal article) DOI for this publication

Media

  • Lectures at the BBC Stargazing Live event at the department; Lectures for the British amateur astronomer society and local historical societies, etc.

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Contact Details

Tel.: +44 (0)116 252 3506
Fax: +44 (0)116 252 2770

Department of Physics & Astronomy,
University of Leicester,
University Road,
Leicester, LE1 7RH,
United Kingdom.

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