The Matryoshka Disk: Keck/Nirc2 Discovery of a Solar-System-Scale, Radially Segregated Residual Protoplanetary Disk Around Hd 141569a

Currie, Thayne; Grady, C. A.; Cloutier, Ryan; Konishi, Mihoko; Stassun, Keivan G.; Debes, John H.; Marel, Nienke van der; Muto, Takayuki; Jayawardhana, Ray; Ratzka, Thorsten

doi:10.3847/2041-8205/819/2/l26

Cited by 19 publications

(35 citation statements)

References 49 publications

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“…The second interesting feature is an arc-like structure to the South East at a radius r 0".6. A reminiscent feature is reported in Currie et al (2016), and in the near-infrared SPHERE images. In the SPHERE images, it is identified as ring "R2" (Perrot et al 2016).…”

Section: Detection Of the Third Inner Disk Componentsupporting

confidence: 54%

“…We also note two recent independent detections of complex inner disk features from Currie et al (2016) and Perrot et al (2016). Currie et al (2016) reported the detection in the L' band, using Keck/NIRC2 in saturated mode and using angular differential imaging. Perrot et al (2016) presented Y, J, H and Ks-band images obtained with the second-generation extreme-adaptive optics planet-finder SPHERE at the Very Large Telescope (VLT), using angular differential imaging as well.…”

Section: Introductionsupporting

confidence: 57%

“…The low-significance detection could also be a dust clump embedded in the inner disk component. We also note that, while other point-like feautres are seen in their images, our particular detection is not reported in the saturated Keck/NIRC2 data set of Currie et al (2016) nor in the SPHERE near-infrared images of Perrot et al (2016).…”

Section: Detection Of the Third Inner Disk Componentmentioning

confidence: 42%

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Characterization of the Inner Disk Around Hd 141569 a From Keck/Nirc2 L-Band Vortex Coronagraphy

Mawet

Choquet

Absil

et al. 2017

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HD 141569 A is a pre-main sequence B9.5 Ve star surrounded by a prominent and complex circumstellar disk, likely still in a transition stage from protoplanetary to debris disk phase. Here, we present a new image of the third inner disk component of HD 141569 A made in the L' band (3.8 µm) during the commissioning of the vector vortex coronagraph recently installed in the near-infrared imager and spectrograph NIRC2 behind the W.M. Keck Observatory Keck II adaptive optics system. We used reference point spread function subtraction, which reveals the innermost disk component from the inner working distance of 23 AU and up to 70 AU. The spatial scale of our detection roughly corresponds to the optical and near-infrared scattered light, thermal Q, N and 8.6µm PAH emission reported earlier. We also see an outward progression in dust location from the L'-band to the H-band (VLT/SPHERE image) to the visible (HST/STIS image), likely indicative of dust blowout. The warm disk component is nested deep inside the two outer belts imaged by HST NICMOS in 1999 (respectively at 406 and 245 AU). We fit our new L'-band image and spectral energy distribution of HD 141569 A with the radiative transfer code MCFOST. Our best-fit models favor pure olivine grains, and are consistent with the composition of the outer belts. While our image shows a putative very-faint point-like clump or source embedded in the inner disk, we did not detect any true companion within the gap between the inner disk and the first outer ring, at a sensitivity of a few Jupiter masses.

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Section: Detection Of the Third Inner Disk Componentsupporting

confidence: 54%

Section: Introductionsupporting

confidence: 57%

Section: Detection Of the Third Inner Disk Componentmentioning

confidence: 42%

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Characterization of the Inner Disk Around Hd 141569 a From Keck/Nirc2 L-Band Vortex Coronagraphy

Mawet

Choquet

Absil

et al. 2017

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“…arms in the disks around SAO 206462 and HD 100453, while Augereau et al (1999), Biller et al (2015), Currie et al (2016) and Perrot et al (2016) found asymmetric rings and gaps with increasing detail in the transitional disk around HD 141569 A. These structures may be signposts of ongoing planet formation.…”

Section: Introductionmentioning

confidence: 88%

Direct detection of scattered light gaps in the transitional disk around HD 97048 with VLT/SPHERE

Ginski

Stolker

Pinilla

et al. 2016

A&A

132

158

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Aims. We studied the well-known circumstellar disk around the Herbig Ae/Be star HD 97048 with high angular resolution to reveal undetected structures in the disk which may be indicative of disk evolutionary processes such as planet formation. Methods. We used the IRDIS near-IR subsystem of the extreme adaptive optics imager SPHERE at the ESO/VLT to study the scattered light from the circumstellar disk via high resolution polarimetry and angular differential imaging. Results. We imaged the disk in unprecedented detail and revealed four ring-like brightness enhancements and corresponding gaps in the scattered light from the disk surface with radii between 39 au and 341 au. We derived the inclination and position angle as well as the height of the scattering surface of the disk from our observational data. We found that the surface height profile can be described by a single power law up to a separation ∼270 au. Using the surface height profile we measured the scattering phase function of the disk and found that it is consistent with theoretical models of compact dust aggregates. We discuss the origin of the detected features and find that low mass (≤1 M Jup ) nascent planets are a possible explanation.

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“…Either an interaction with two M-type companion stars (e.g., Augereau & Papaloizou 2004) or planet formation (Wyatt 2005), or both, can account for the disk structures. Recent observations have further discovered an inner disk component inside the inner ring (e.g., Currie et al 2016;Konishi et al 2016), but no point-like source has been detected within the gap between the inner disk and the inner ring (Konishi et al 2016). Li & Lunine (2003) modeled the IR emission from the HD 141569 disk using a porous dust model together with a population of PAH molecules and found that PAHs in the disk are largely charged and dust grains with a high porosity are preferred.…”

Section: A29 Hd 141569mentioning

confidence: 99%

Polycyclic Aromatic Hydrocarbons in Protoplanetary Disks around Herbig Ae/Be and T Tauri Stars

Seok¹,

Li²

2017

ApJ

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A distinct set of broad emission features at 3. 3, 6.2, 7.7, 8.6, 11.3, and 12.7 µm, is often detected in protoplanetary disks (PPDs). These features are commonly attributed to polycyclic aromatic hydrocarbons (PAHs). We model these emission features in the infrared spectra of 69 PPDs around 14 T Tauri and 55 Herbig Ae/Be stars in terms of astronomical-PAHs. For each PPD, we derive the size distribution and the charge state of PAHs. We then examine the correlations of the PAH properties (i.e., sizes and ionization fractions) with the stellar properties (e.g., stellar effective temperature, luminosity, and mass). We find that the characteristic size of PAHs shows a tendency of correlating with the stellar effective temperature (T eff ) and interpret this as the preferential photodissociation of small PAHs in systems with higher T eff of which the stellar photons are more energetic. In addition, the PAH size shows a moderate correlation with the red-ward wavelength-shift of the 7.7 µm PAH feature that is commonly observed in disks around cool stars. The ionization fraction of PAHs does not seem to correlate with any stellar parameters. This is because the charging of PAHs depends on not only the stellar properties (e.g., T eff , luminosity) but also the spatial distribution of PAHs in the disks. The mere negative correlation between the PAH size and the stellar age suggests that continuous replenishment of PAHs via the outgassing of cometary bodies and/or the collisional grinding of planetesimals and asteroids is required to maintain the abundance of small PAHs against complete destruction by photodissociation.

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The Matryoshka Disk: Keck/Nirc2 Discovery of a Solar-System-Scale, Radially Segregated Residual Protoplanetary Disk Around Hd 141569a

Cited by 19 publications

References 49 publications

Characterization of the Inner Disk Around Hd 141569 a From Keck/Nirc2 L-Band Vortex Coronagraphy

Characterization of the Inner Disk Around Hd 141569 a From Keck/Nirc2 L-Band Vortex Coronagraphy

Direct detection of scattered light gaps in the transitional disk around HD 97048 with VLT/SPHERE

Polycyclic Aromatic Hydrocarbons in Protoplanetary Disks around Herbig Ae/Be and T Tauri Stars

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