MULTI-WAVELENGTH PHOTOMETRY OF THE T TAURI BINARY V582 Mon (KH 15D): A NEW EPOCH OF OCCULTATIONS

Windemuth, Diana; Herbst, W.

doi:10.1088/0004-6256/147/1/9

Cited by 17 publications

(39 citation statements)

References 31 publications

(39 reference statements)

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“…Wider binaries can experience periodic dimming as components of the binary pass behind a circumbinary disk, as is the case in KH 15D (e.g., Windemuth & Herbst 2014;Arulanantham et al 2016). The 131-day-period WL 4 system and the 93-day-period YLW 16A system (Plavchan et al 2013) show similar dimming behavior, suggesting a similar origin for their variability.…”

Section: Discussionmentioning

confidence: 86%

Spitzer Observations of Long-Term Infrared Variability Among Young Stellar Objects in Chamaeleon I

Flaherty

DeMarchi

Muzerolle

et al. 2016

ApJ

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Infrared variability is common among young stellar objects, with surveys finding daily to weekly fluctuations of a few tenths of a magnitude. Space-based observations can produce highly sampled infrared light curves, but are often limited to total baselines of about 1 month due to the orientation of the spacecraft. Here we present observations of the Chameleon I cluster, whose low declination makes it observable by the Spitzer Space Telescope over a 200-day period. We observe 30 young stellar objects with a daily cadence to better sample variability on timescales of months. We find that such variability is common, occurring in ∼80% of the detected cluster members. The change in [3.6]-[4.5] color over 200 days for many of the sources falls between that expected for extinction and fluctuations in disk emission. With our high cadence and long baseline we can derive power spectral density curves covering two orders of magnitude in frequency and find significant power at low frequencies, up to the boundaries of our 200-day survey. Such long timescales are difficult to explain with variations driven by the interaction between the disk and stellar magnetic field, which has a dynamical timescale of days to weeks. The most likely explanation is either structural or temperature fluctuations spread throughout the inner ∼0.5 au of the disk, suggesting that the intrinsic dust structure is highly dynamic.

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Section: Discussionmentioning

confidence: 86%

Spitzer Observations of Long-Term Infrared Variability Among Young Stellar Objects in Chamaeleon I

Flaherty

DeMarchi

Muzerolle

et al. 2016

ApJ

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“…An extensive analysis of Hα profiles and associated emission variability is provided in Hamilton et al (2012). The analyzed spectra covered five contiguous ened by 0.77 magnitude in the R band from December 20 to 21 (Windemuth & Herbst 2014) and this magnitude is used to convert the line equivalent width into flux, an incorrect assignment of the R band can explain the factor of ∼ 2 underestimation in the [O I] λ6300 flux. The out of eclipse and ingress spectra (left panel) are characterized by an inverse P-Cygni-type profile with a strong redshifted absorption whose changes in centroid velocity can be explained by an accretion stream onto A .…”

Section: Hα Profilesmentioning

confidence: 99%

Double-peaked [O i] Profile: A Likely Signature of the Gaseous Ring around KH 15D

Fang

Pascucci

Kim

et al. 2019

ApJL

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KH 15D is a well-known spectroscopic binary because of its unique and dramatic photometric variability. The variability is explained by a circumbinary dust ring but the ring itself was never directly detected. We present a new interpretation of the double-peaked [O I] λ6300 profiles as originating from the hot disk surface of KH 15D. By modeling these profiles, we measure emitting radii between ∼0.5-5 au, basically a gaseous ring very similar in radial extent to the dust ring inferred from modeling the system's photometric variability. We also discuss the possibility that external photoevaporation driven by UV photons from the nearby massive star HD 47887 has truncated the outer edge of the disk to the observed value.

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“…During the time between 2010 and 2012, both stars A and B were only detectable through scattered light. Currently, the brightness of the system has increased as star B's orbit has become uncovered from the the trailing edge of the precessing disc (Capelo et al 2012;Windemuth & Herbst 2014;Arulanantham et al 2016;Aronow et al 2018).…”

Section: Circumbinary Disc Of Kh 15dmentioning

confidence: 99%

Alignment of a circumbinary disc around an eccentric binary with application to KH 15D

Smallwood

Lubow

Franchini

et al. 2019

Monthly Notices of the Royal Astronomical Society

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We analyse the evolution of a mildly inclined circumbinary disc that orbits an eccentric orbit binary by means of smoother particle hydrodynamic (SPH) simulations and linear theory. We show that the alignment process of an initially misaligned circumbinary disc around an eccentric orbit binary is significantly different than around a circular orbit binary and involves tilt oscillations. The more eccentric the binary, the larger the tilt oscillations and the longer it takes to damp these oscillations. A circumbinary disc that is only mildly inclined may increase its inclination by a factor of a few before it moves towards alignment. The results of the SPH simulations agree well with those of linear theory. We investigate the properties of the circumbinary disc/ring around KH 15D. We determine disc properties based on the observational constraints imposed by the changing binary brightness. We find that the inclination is currently at a local minimum and will increase substantially before setting to coplanarity. In addition, the nodal precession is currently near its most rapid rate. The recent observations that show a reappearance of Star B impose constraints on the thickness of the layer of obscuring material. Our results suggest that disc solids have undergone substantial inward drift and settling towards to disc midplane. For disc masses ∼ 0.001M ⊙ , our model indicates that the level of disc turbulence is low α ≪ 0.001. Another possibility is that the disc/ring contains little gas.

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MULTI-WAVELENGTH PHOTOMETRY OF THE T TAURI BINARY V582 Mon (KH 15D): A NEW EPOCH OF OCCULTATIONS

Cited by 17 publications

References 31 publications

Spitzer Observations of Long-Term Infrared Variability Among Young Stellar Objects in Chamaeleon I

Spitzer Observations of Long-Term Infrared Variability Among Young Stellar Objects in Chamaeleon I

Double-peaked [O i] Profile: A Likely Signature of the Gaseous Ring around KH 15D

Alignment of a circumbinary disc around an eccentric binary with application to KH 15D

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