Resolved debris discs around A stars in the Herschel DEBRIS survey

Booth, Mark; Kennedy, Grant M.; Sibthorpe, B.; Matthews, Brenda C.; Wyatt, M. C.; Duchêne, Gaspard; Kavelaars, J. J.; Rodríguez, David; Greaves, J. S.; Koning, Alice; Vican, Laura; Rieke, G. H.; Su, K. Y. L.; Moro‐Martín, Amaya; Kalas, Paul

doi:10.1093/mnras/sts117

Cited by 159 publications

(165 citation statements)

References 80 publications

(85 reference statements)

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“…In debris disks the dust temperature at a given radius is often found to be higher than that for blackbody grains, or conversely the observed radial location of the dust grains is larger than predicted for blackbody grains (Booth et al 2013). Previous models of dust emission from the HD 141569 system (Li & Lunine 2003;Nilsson et al 2010) find typical dust temperatures of 50-200 K in the outer disk, higher than our estimated blackbody temperature of 51 K, consistent with the presence of small dust grains.…”

Section: Discussionmentioning

confidence: 95%

Resolved Co Gas Interior to the Dust Rings of the Hd 141569 Disk

Flaherty

Hughes

Andrews

et al. 2016

ApJ

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The disk around HD 141569 is one of a handful of systems whose weak infrared emission is consistent with a debris disk, but still has a significant reservoir of gas. Here we report spatially resolved millimeter observations of the CO(3-2) and CO(1-0) emission as seen with the Submillimeter Array and CARMA. We find that the excitation temperature for CO is lower than expected from cospatial blackbody grains, similar to previous observations of analogous systems, and derive a gas mass that lies between that of gas-rich primordial disks and gas-poor debris disks. The data also indicate a large inner hole in the CO gas distribution and an outer radius that lies interior to the outer scattered light rings. This spatial distribution, with the dust rings just outside the gaseous disk, is consistent with the expected interactions between gas and dust in an optically thin disk. This indicates that gas can have a significant effect on the location of the dust within debris disks.

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Section: Discussionmentioning

confidence: 95%

Resolved Co Gas Interior to the Dust Rings of the Hd 141569 Disk

Flaherty

Hughes

Andrews

et al. 2016

ApJ

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“…For two stars, IRS spectra from Spitzer were available (green line). For HIP 10670 Herschel data (the three longest wavelength points in blue) were available from the DEBRIS survey (Booth et al 2013). (A color version of this figure is available in the online journal.…”

Section: Discussionmentioning

confidence: 99%

Young Stars Near Earth: The Octans-Near Association and Castor Moving Group

Zuckerman

Vican

Song

et al. 2013

ApJ

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All cataloged stellar moving groups and associations with ages 100 Myr and within 100 pc of Earth have Galactic space motions (UVW) situated in a "good box" with dimensions ∼20 km s −1 on a side. Torres et al. defined the Octans Association as a group of 15 stars with age "20 Myr?" and located ∼140 pc from Earth, but with average V space velocity −3.6 km s −1 that is well outside of the good box. We present a list of 14 Hipparcos star systems within 100 pc of Earth that we call "Octans-Near"; these systems have UVW similar to those of the much more distant Octans Association. The Octans-Near stars have apparent ages between about 30 and 100 Myr and their relationship to the Octans Association stars is unclear. Six additional star systems have UVW similar to those of Octans-Near stars and likely ages 200 Myr. These six systems include the late-type binary star EQ Peg-6.2 pc from Earth with likely age 100 Myr and thus likely to be the nearest known pre-main sequence star system. The UVW of stars in a previously proposed ∼200 Myr old Castor moving group are not too dissimilar from the UVW of Octans-Near stars. However, stars in the Castor group-if it exists at all-are mostly substantially older than 200 Myr and thus generally can readily be distinguished from the much younger Octans-Near stars.

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“…That blackbody radii are a lower limit to actual debris disc radii is a well known fact (see e.g. Booth et al 2013).…”

Section: Notes On the Individual Sedsmentioning

confidence: 91%

Gas and dust in the beta Pictoris moving group as seen by theHerschelSpace Observatory

Riviére-Marichalar

Barrado

Montesinos

et al. 2014

A&A

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Context. Debris discs are thought to be formed through the collisional grinding of planetesimals, and then can be considered as the outcome of planet formation. Understanding the properties of gas and dust in debris discs can help us comprehend the architecture of extrasolar planetary systems. Herschel Space Observatory far-infrared (IR) photometry and spectroscopy have provided a valuable dataset for the study of debris discs gas and dust composition. This paper is part of a series of papers devoted to the study of Herschel-PACS observations of young stellar associations. Aims. This work aims at studying the properties of discs in the beta Pictoris moving group (BPMG) through far-IR PACS observations of dust and gas. Methods. We obtained Herschel-PACS far-IR photometric observations at 70, 100, and 160 μm of 19 BPMG members, together with spectroscopic observations for four of them. These observations were centred at 63.18 μm and 157 μm, aiming to detect [OI] and [CII] emission. We incorporated the new far-IR observations in the SED of BPMG members and fitted modified blackbody models to better characterise the dust content. Results. We have detected far-IR excess emission towards nine BPMG members, including the first detection of an IR excess towards HD 29391.The star HD 172555, shows [OI] emission, while HD 181296 shows [CII] emission, expanding the short list of debris discs with a gas detection. No debris disc in BPMG is detected in both [OI] and [CII]. The discs show dust temperatures in the range 55-264 K, with low dust masses (<6.6 × 10 −5 M ⊕ to 0.2 M ⊕ ) and radii from blackbody models in the range 3 to ∼82 AU. All the objects with a gas detection are early spectral type stars with a hot dust component.

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Resolved debris discs around A stars in the Herschel DEBRIS survey

Cited by 159 publications

References 80 publications

Resolved Co Gas Interior to the Dust Rings of the Hd 141569 Disk

Resolved Co Gas Interior to the Dust Rings of the Hd 141569 Disk

Young Stars Near Earth: The Octans-Near Association and Castor Moving Group

Gas and dust in the beta Pictoris moving group as seen by theHerschelSpace Observatory

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