Infrared variability from circumbinary disc temperature modulations

Bodman, Eva H. L.; Quillen, Alice C.

doi:10.1093/mnras/stv1769

Cited by 3 publications

(3 citation statements)

References 32 publications

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“…This is especially true beyond several×a b , where the time-varying non-axisymmetric disk structures become subdominant. The same is true for the variability in time and space of the irradiation flux impinging on the disk surface (Clanton 2013;Shadmehri & Khajenabi 2015;Bodman & Quillen 2015).…”

Section: Icelinementioning

confidence: 83%

“…Second, illumination of the disk by the binary plays important role in setting its thermal structure ( §4.1, 8.1). Orbital motion of the binary leads to periodic variations of the stellar flux impinging on disk surface, the effect of which has been explored in Clanton (2013) and Bodman & Quillen (2015). We neglect this variability of irradiation and study only its time-averaged effect in this work.…”

Section: General Setupmentioning

confidence: 99%

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Tatooine Nurseries: Structure and Evolution of Circumbinary Protoplanetary Disks

Vartanyan

Garmilla

Rafikov³

2016

ApJ

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Recent discoveries of circumbinary planets by Kepler mission provide motivation for understanding their birthplaces -protoplanetary disks around stellar binaries with separations 1 AU. We explore properties and evolution of such circumbinary disks focusing on modification of their structure caused by tidal coupling to the binary. We develop a set of analytical scaling relations describing viscous evolution of the disk properties, which are verified and calibrated using 1D numerical calculations with realistic inputs. Injection of angular momentum by the central binary suppresses mass accretion onto the binary and causes radial distribution of the viscous angular momentum flux F J to be different from that in a standard accretion disk around a single star with no torque at the center. Disks with no mass accretion at the center develop F J profile which is flat in radius. Radial profiles of temperature and surface density are also quite different from those in disks around single stars. Damping of the density waves driven by the binary and viscous dissipation dominate heating of the inner disk (within 1-2 AU), pushing the iceline beyond 3-5 AU, depending on disk mass and age. Irradiation by the binary governs disk thermodynamics beyond ∼ 10 AU. However, self-shadowing by the hot inner disk may render central illumination irrelevant out to ∼ 20 AU. Spectral energy distribution of a circumbinary disk exhibits a distinctive bump around 10µm, which may facilitate identification of such disks around unresolved binaries. Efficient tidal coupling to the disk drives orbital inspiral of the binary and may cause low-mass and relatively compact binaries to merge into a single star within the disk lifetime. We generally find that circumbinary disks present favorable sites for planet formation (despite their wider zone of volatile depletion), in agreement with the statistics of Kepler circumbinary planets.

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Section: Icelinementioning

confidence: 83%

Section: General Setupmentioning

confidence: 99%

Tatooine Nurseries: Structure and Evolution of Circumbinary Protoplanetary Disks

Vartanyan

Garmilla

Rafikov³

2016

ApJ

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“…We prescribed a fixed temperature profile. Since we did not account for radiation from the central stars we have an axisymmetric temperature profile, rather than one which oscillates during the orbit of the stars (Nagel et al 2010;Bodman & Quillen 2015). This azimuthal temperature variation would lead to local fluctuations in viscosity.…”

Section: R / Amentioning

confidence: 99%

On the cavity size in circumbinary discs

Hirsh,

Price,

Gonzalez

et al. 2020

Preprint

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How does the cavity size in circumbinary discs depend on disc and binary properties? We investigate by simulating disc cavities carved by binary companions using smoothed particle hydrodynamics (SPH). We find that a cavity is quickly opened on the dynamical time, while the cavity size is set on the viscous time. In agreement with previous findings, we find long term cavity sizes of 2-5 times the binary semi-major axis, increasing with eccentricity and decreasing with disc aspect ratio. When considering binaries inclined with respect to the disc we find three regimes: i) discs that evolve towards a coplanar orbit have a large cavity, slightly smaller than that of an initially coplanar disc; ii) discs that evolve towards a polar orbit by breaking have a small cavity, equal in size to that of an initially polar disc; iii) discs that evolve towards a polar orbit via warping have an intermediate-sized cavity. We find typical gas depletions inside the cavity of 2 orders of magnitude in surface density.

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On the cavity size in circumbinary discs

Hirsh

Price

Gonzalez

et al. 2020

Monthly Notices of the Royal Astronomical Society

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How does the cavity size in circumbinary discs depend on disc and binary properties? We investigate by simulating disc cavities carved by binary companions using smoothed particle hydrodynamics (SPH). We find that a cavity is quickly opened on the dynamical time, while the cavity size is set on the viscous time. In agreement with previous findings, we find long term cavity sizes of 2–5 times the binary semi-major axis, increasing with eccentricity and decreasing with disc aspect ratio. When considering binaries inclined with respect to the disc we find three regimes: i) discs that evolve towards a coplanar orbit have a large cavity, slightly smaller than that of an initially coplanar disc; ii) discs that evolve towards a polar orbit by breaking have a small cavity, equal in size to that of an initially polar disc; iii) discs that evolve towards a polar orbit via warping have an intermediate-sized cavity. We find typical gas depletions inside the cavity of ≳ 2 orders of magnitude in surface density.

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Infrared variability from circumbinary disc temperature modulations

Cited by 3 publications

References 32 publications

Tatooine Nurseries: Structure and Evolution of Circumbinary Protoplanetary Disks

Tatooine Nurseries: Structure and Evolution of Circumbinary Protoplanetary Disks

On the cavity size in circumbinary discs

On the cavity size in circumbinary discs

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