Zobrazeno 1 - 10
of 118
pro vyhledávání: '"Sergei Nayakshin"'
Publikováno v:
The Astrophysical Journal, Vol 965, Iss 2, p 110 (2024)
Current imaging observations of protoplanetary disks using the Atacama Large Millimeter/submillimeter Array (ALMA) primarily focus on the submillimeter wavelength, leaving a gap in effective observational approaches for centimeter-sized dust, which i
Externí odkaz:
https://doaj.org/article/a8a83bae50284338ab8a8f2611a88be8
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 518:791-809
3D simulations of high mass young stellar object (HMYSO) growth show that their circumstellar discs fragment onto multiple self-gravitating objects. Accretion of these by HMYSO may explain episodic accretion bursts discovered recently. We post-proces
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 515:3113-3125
Planets open deep gaps in protoplanetary discs when their mass exceeds a gap opening mass, $M_{\rm gap}$. We use one- and two-dimensional simulations to study planet gap opening in discs with angular momentum transport powered by MHD disc winds. We p
Resolved dust continuum and CO line ALMA imaging, and in some cases detection of H$\alpha$ emission, hint that young massive planets are abundant at wide separations in protoplanetary discs. Here, we show how these observations can probe the runaway
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ffaddc12a3b245f720844264daa70842
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 488:4873-4889
Direct imaging (DI) surveys suggest that gas giants beyond 20 AU are rare around FGK stars. However, it is not clear what this means for the formation frequency of Gravitational Instability (GI) protoplanets due to uncertainties in gap opening and mi
Autor:
Farzana Meru, W. Dehnen, Hongping Deng, Lucio Mayer, Ken Rice, Dimitris Stamatellos, Mark Fletcher, Sergei Nayakshin
Publikováno v:
Fletcher, M, Nayakshin, S, Stamatellos, D, Dehnen, W, Meru, F, Mayer, L, Deng, H & Rice, K 2019, ' Giant planets and brown dwarfs on wide orbits : a code comparison project ', Monthly Notices of the Royal Astronomical Society . https://doi.org/10.1093/mnras/stz1123
Gas clumps formed within massive gravitationally unstable circumstellar discs are potential seeds of gas giant planets, brown dwarfs and companion stars. Simulations show that competition between three processes -- migration, gas accretion and tidal
Autor:
Jochen Eislöffel, Sergei Nayakshin, Vardan G. Elbakyan, Alessio Caratti o Garatti, Eduard I. Vorobyov
It is well known that low mass young stellar objects (LMYSOs) gain a significant portion of their final mass through episodes of very rapid accretion, with mass accretion rates up to $\dot M_* \sim 10^{-4} M_{\odot}$~yr$^{-1}$. Recent observations of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d9f6942a17a5a391d1e132d8e778babb
Searches for young gas giant planets at wide separations have so far focused on techniques appropriate for compact (Jupiter sized) planets. Here we point out that protoplanets born through Gravitational Instability (GI) may remain in an initial pre-c
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::76497e2a42e22ec559d41df8069fb973
http://arxiv.org/abs/2008.04014
http://arxiv.org/abs/2008.04014
Autor:
Ravit Helled, Farzana Meru, J. Humphries, Patrick Neunteufel, Sergei Nayakshin, Takashi Tsukagoshi, Allona Vazan, O. Panić, Cassandra Hall
Dark rings with bright rims are the indirect signposts of planets embedded in protoplanetary discs. In a recent first, an azimuthally elongated AU-scale blob, possibly a planet, was resolved with ALMA in TW Hya. The blob is at the edge of a cliff-lik
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8c1ee9dc0aa1c3d5eb5ca7c9c08fc508
https://doi.org/10.5167/uzh-199768
https://doi.org/10.5167/uzh-199768
Autor:
Sergei Nayakshin
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 470:2387-2409