Evolution from protoplanetary to debris discs: the transition disc around HD 166191

Kennedy, Grant M.; Murphy, Simon J.; Lisse, C. M.; Ménard, F.; Sitko, Michael L.; Wyatt, M. C.; Bayliss, Daniel; DeMeo, Francesca E.; Crawford, K.B.; Kim, D. L.; Rudy, R. J.; Russell, R. W.; Sibthorpe, B.; Skinner, Mark A.; Zhou, George

doi:10.1093/mnras/stt2435

Cited by 16 publications

(17 citation statements)

References 102 publications

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“…We selected 25 systems whose properties are similar to the recently identified gas-rich debris disks, thereby focusing on A-type stars younger than 100 Myr and with a large dust radius R dust >30 au. The sources were collected from various IRAS, Spitzer, WISE, and Herschel debris disks studies (Rhee et al 2007;Wyatt et al 2007;Zuckerman & Song 2004;Patel et al 2014;Morales et al 2009;Chen et al 2006;Riviere-Marichalar et al 2014;Kennedy et al 2014). Among the 25 selected targets, 17 are new sources for the search of CO and 8 sources had been observed in only one of these two CO transitions.…”

Section: Apex and Iram Observationsmentioning

confidence: 99%

The hybrid disks: a search and study to better understand evolution of disks

Péricaud

Folco

Dutrey

et al. 2017

A&A

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Context. The increased sensitivity of millimeter-wave facilities now makes possible the detection of low amounts of gas in debris disks. Some of the gas-rich debris disks harbor peculiar properties, with possible pristine gas and secondary generated dust. The origin of the gas in these hybrid disks is strongly debated and the current sample is too sparse to understand this phenomenon. Aims. More detections are necessary to increase the statistics on this population. Lying at the final stages of evolution of protoplanetary disks and at the beginning of the debris disk phase, these objects could provide new insight into the processes involved in the making of planetary systems. Methods. We carried out a deep survey of the CO J=2→1 and CO J=3→2 lines with the APEX and IRAM radiotelescopes in young debris disks selected according to hybrid disk properties. The survey is complemented with a bibliographic study of the ratio between the emission of the gas and the continuum (S CO /F cont ) in CTTS, Herbig Ae, WTTS, hybrid, and debris disks. Results. Our sub-mm survey comprises 25 stars, including 17 new targets, and we increase the sensitivity limit by a factor 2 on eight sources compared to similar published studies. We report a 4 σ tentative detection of a double-peaked CO J=2→1 line around HD 23642; an eclipsing binary located in the Pleiades. We also reveal a correlation between the emission of the CO gas and the dust continuum from CTTS, Herbig Ae and few debris disks. The observed trend of the gas to dust flux ratio suggests a concurrent dissipation of the dust and gas components. Hybrid disks systematically lie above this trend, suggesting that these systems may witness a transient phase, when the dust has evolved more rapidly than the gas, with a flux ratio S CO /F cont enhanced by a factor of between 10 and 100 compared to standard (proto-)planetary disks.

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Section: Apex and Iram Observationsmentioning

confidence: 99%

The hybrid disks: a search and study to better understand evolution of disks

Péricaud

Folco

Dutrey

et al. 2017

A&A

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“…To explore possible geometries we use a simple relation between fractional luminosity L disc / L ⋆ , (uniform) geometrical optical depth τ , and the disc opening angle θ [ 12 ],

which says that the fractional luminosity is the optical depth of the dust multiplied by the fraction of the sky covered as seen from the star. The dust belt must therefore have an opening angle of at least 8 ° to capture 7% of the starlight.…”

Section: Disc Structure and Evolutionary Statementioning

confidence: 99%

“…Similarly, the state and origin of the debris disc is uncertain. At stellocentric distances near 1 AU, the region of interest in this article, it could be that dust observed at this time is related to the final stages of planet formation [ 8 , 9 ], originates in young analogues of our asteroid belt [ 10 ], is a signature of comets scattered inwards from more distant regions [ 11 ] or is simply a remnant of the gas-rich disc that has yet to be dispersed [ 12 ]. In the absence of gas detections that argue for the latter scenario, discerning among these various scenarios, which are not mutually exclusive, is difficult.…”

Section: Introductionmentioning

confidence: 99%

The transiting dust clumps in the evolved disc of the Sun-like UXor RZ Psc

et al. 2017

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RZ Psc is a young Sun-like star, long associated with the UXor class of variable stars, which is partially or wholly dimmed by dust clumps several times each year. The system has a bright and variable infrared excess, which has been interpreted as evidence that the dimming events are the passage of asteroidal fragments in front of the host star. Here, we present a decade of optical photometry of RZ Psc and take a critical look at the asteroid belt interpretation. We show that the distribution of light curve gradients is non-uniform for deep events, which we interpret as possible evidence for an asteroidal fragment-like clump structure. However, the clumps are very likely seen above a high optical depth midplane, so the disc’s bulk clumpiness is not revealed. While circumstantial evidence suggests an asteroid belt is more plausible than a gas-rich transition disc, the evolutionary status remains uncertain. We suggest that the rarity of Sun-like stars showing disc-related variability may arise because (i) any accretion streams are transparent and/or (ii) turbulence above the inner rim is normally shadowed by a flared outer disc.

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“…All of them are reported as debris disks candidates in previous works (Oudmaijer et al 1992;Clarke et al 2005;McDonald et al 2012;Fujiwara et al 2013). It should be noted that HD 166191 was studied by both Schneider et al (2013) and Kennedy et al (2014) and the conclusions were different. Additional observations are certainly needed to clarify the nature of these objects.…”

Section: Debris-disk Candidates With Akari 18 µM Excess Emissionmentioning

confidence: 94%

Faint warm debris disks around nearby bright stars explored by AKARI and IRSF

Ishihara

Takeuchi

Kobayashi

et al. 2017

A&A

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Context. Debris disks are important observational clues for understanding planetary-system formation process. In particular, faint warm debris disks may be related to late planet formation near 1 au. A systematic search of faint warm debris disks is necessary to reveal terrestrial planet formation. Aims. Faint warm debris disks show excess emission that peaks at mid-IR wavelengths. Thus we explore debris disks using the AKARI mid-IR all-sky point source catalog (PSC), a product of the second generation unbiased IR all-sky survey. Methods. We investigate IR excess emission for 678 isolated main-sequence stars for which there are 18 µm detections in the AKARI mid-IR all-sky catalog by comparing their fluxes with the predicted fluxes of the photospheres based on optical to near-IR fluxes and model spectra. The near-IR fluxes are first taken from the 2MASS PSC. However, 286 stars with Ks<4.5 in our sample have large flux errors in the 2MASS photometry due to saturation. Thus we have measured accurate J, H, and Ks band fluxes, applying neutral density (ND) filters for Simultaneous InfraRed Imager for Unbiased Survey (SIRIUS) on IRSF, the φ1.4 m near-IR telescope in South Africa, and improved the flux accuracy from 14% to 1.8% on average. Results. We identified 53 debris-disk candidates including eight new detections from our sample of 678 main-sequence stars. The detection rate of debris disks for this work is ∼8%, which is comparable with those in previous works by Spitzer and Herschel. Conclusions. The importance of this study is the detection of faint warm debris disks around nearby field stars. At least nine objects have a large amount of dust for their ages, which cannot be explained by the conventional steady-state collisional cascade model.

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Evolution from protoplanetary to debris discs: the transition disc around HD 166191

Cited by 16 publications

References 102 publications

The hybrid disks: a search and study to better understand evolution of disks

The hybrid disks: a search and study to better understand evolution of disks

The transiting dust clumps in the evolved disc of the Sun-like UXor RZ Psc

Faint warm debris disks around nearby bright stars explored by AKARI and IRSF

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