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Douglas N. C

As seen in: arXiv, Oxford Academic, Oxford University Press (OUP)
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Articles by Douglas N. C

Astrophysics > Solar and Stellar Astrophysics

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By Douglas N. C, Douglas Lin
| arXiv
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Astrophysics > Astrophysics of Galaxies

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By Douglas N. C
| arXiv
Gravitationally unstable outer regions of AGN discs may host in situ formation of massive stars whose heating produces localized vertical "pillars" on the disc surface, in the same region that emits the broad lines. Here we investigate the reverberation-mapping signatures that such pillars would produce. We compute velocity-delay maps $Ψ(λ, τ)$, time-evolving emission-line spectra, and continuum reverberation lag spectra for these structures.
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Astrophysics > Astrophysics of Galaxies

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By Douglas N. C
| arXiv
We report spectroscopic observations of a remarkable QSO, J115724.80-000455.56 at $z=0.287$ from the Dark Energy Spectroscopic Instrument (DESI) survey. This QSO exhibits variability in its hydrogen Balmer absorption over a time interval of 10 months in the observed frame between 2021 and 2022.
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Numerical simulations of the interaction between the stellar magnetic field and a planet

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By Douglas N. C
| Oxford Academic Verified
Among the thousands of exoplanets recently discovered, a significant portion orbits in close proximity to their host stars, with some even completing orbital periods in less than one day (i.e. ultrashort period planets; USP hereafter). The in situ formation of these planets poses a challenge, since the orbital distances of the USP planets are within the dust sublimation zone (Flock et al. 2019).
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Dust accumulation near the magnetospheric truncation of protoplanetary discs. II. The effects of opacity and thermal evolution

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By Douglas N. C
| Oxford University Press (OUP)
Dust trapping in the global pressure bump induced by magnetospheric truncation offers a promising formation mechanism for close-in super-Earths/sub-Neptunes. These planets likely form in evolved protoplanetary discs, where the gas temperature at the expanding truncation radius become amiable to refractory solids. However, dust accumulation may alter the disc opacity such that thermal evolution is inevitable.
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Stellar/BH population in AGN Disks: Direct binary formation from capture objects in nuclei clusters

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By Douglas N. C
| Oxford University Press (OUP)
The Active Galatic Nuclei(AGN) disk has been proposed as a potential channel for the merger of binary black holes. The population of massive stars and black holes in AGN disks captured from the nuclei cluster plays a crucial role in determining the efficiency of binary formation and final merger rate within the AGN disks. In this paper, we investigate the capture process using analytical and numerical approaches. We discover a new constant integral of motion for one object’s capture process.
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3D global simulations of accretion onto gap-opening planets: implications for circumplanetary disc structures and accretion rates

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By Douglas N. C
| Oxford University Press (OUP)
In the widely accepted core accretion model for planet formation (Bodenheimer & Pollack 1986; Pollack et al. 1996; Ida & Lin 2004), the quasi-steady atmosphere accretion driven by slow Kelvin–Helmholtz contraction is followed by unstable runaway accretion, when an atmosphere’s mass grows beyond a critical core mass and thermal equilibrium is disrupted (e.g. Pollack et al. 1996; Lee, Chiang & Ormel 2014; Ormel, Shi & Kuiper 2015; Chen et al. 2020a; Zhong & Yu 2022).
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Hydrodynamical simulations of circumbinary accretion: balance between heating and cooling

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By Wilberforce Road, Douglas N. C, Tsinghua Univeristy
| Oxford University Press (OUP)
Circumbinary discs (CBDs) can be present in a wide range of binary systems and play a crucial role in their evolution. In the star formation context, CBDs can form as a natural product of disc or core fragmentations and dynamical interactions (Boss 1986; Bonnell & Bate 1994a, b; Kratter, Matzner & Krumholz 2008).
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The impermanent fate of massive stars in AGN disks

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By Space science, Abu Dhabi, Douglas N. C
| Oxford University Press (OUP)
Stars are likely to form or to be captured in AGN disks. Their mass reaches an equilibrium when their rate of accretion is balanced by that of wind. If the exchanged gas is well mixed with the stellar core, this metabolic process would indefinitely sustain an ‘immortal’ state on the main sequence (MS) and pollute the disk with He byproducts.
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[2004.07218] Tidal fragmentation as the origin of 1I/2017 U1 ('Oumuamua)

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By Douglas N. C
| arXiv
[Submitted on 15 Apr 2020] Authors:Yun Zhang, Douglas N. C. Lin Download PDF Abstract: The first discovered interstellar object (ISO), `Oumuamua (1I/2017 U1) shows a dry and rocky surface, an unusually elongated short-to-long axis ratio $c/a \lesssim 1/6$, a low velocity relative to the local standard of rest ($\sim 10$ km s$^{-1}$), non-gravitational accelerations, and tumbles on a few hours timescale.
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