ALMA 1.3 mm Map of the HD 95086 System

Su, Kate; MacGregor, Meredith A.; Booth, Mark; Wilner, David J.; Flaherty, Kevin; Hughes, A. Meredith; Phillips, Neil; Malhotra, Renu; Hales, Antonio; Morrison, Sarah J.; Matthews, Brenda C.; Dent, W. R. F.; Casassus, S.

doi:10.3847/1538-3881/aa906b

Cited by 68 publications

(49 citation statements)

References 58 publications

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“…In section 4 we make use of the new band 3 and 7 data to give us a much more accurate measure of the spectral index and confirm that the spectral index of the bright source is indeed steep with a value at the peak of 3.6±0.3 compared to 2.41±0.12 for the rest of the disc (as discussed in section 5.4). As discussed in Su et al (2017), this steep spectral index is consistent with this source being a background galaxy. For instance, Casey (2012) found from a sample of luminous and ultraluminous infrared galaxies, that the spectral slope in the Rayleigh-Jeans regime is 3.60±0.38.…”

Section: Nature Of the Compact Continuum Sourcessupporting

confidence: 79%

“…Nonetheless, it seems unlikely that the bright continuum source is contributing any CO around the stellar velocity. Su et al (2017) also noted the steeper spectral index of the bright source compared to the disc using just the band 6 data. In section 4 we make use of the new band 3 and 7 data to give us a much more accurate measure of the spectral index and confirm that the spectral index of the bright source is indeed steep with a value at the peak of 3.6±0.3 compared to 2.41±0.12 for the rest of the disc (as discussed in section 5.4).…”

Section: Nature Of the Compact Continuum Sourcesmentioning

confidence: 88%

“…The debris disc was first resolved by Herschel (Moór et al 2013a;Su et al 2015). Analysis of recent images from ALMA shows the cold component of the disc to extend from around 100 to 320 AU (Su et al 2017;Zapata et al 2018). In addition to the disc, two bright, compact sources are found on the West side of the disc and are thought to be background contamination.…”

Section: Introductionmentioning

confidence: 99%

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Deep ALMA search for CO gas in the HD 95086 debris disc

Booth

Matrà

et al. 2018

Monthly Notices of the Royal Astronomical Society

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One of the defining properties of debris discs compared to protoplanetary discs used to be their lack of gas, yet small amounts of gas have been found around an increasing number of debris discs in recent years. These debris discs found to have gas tend to be both young and bright. In this paper we conduct a deep search for CO gas in the system HD 95086 -a 17 Myr old, known planet host that also has a debris disc with a high fractional luminosity of 1.5×10 −3 . Using the Atacama Large Millimeter/submillimeter Array (ALMA) we search for CO emission lines in bands 3, 6 and 7. By implementing a spectro-spatial filtering technique, we find tentative evidence for CO J=2-1 emission in the disc located at a velocity, 8.5±0.2 km s −1 , consistent with the radial velocity of the star. The tentative detection suggests that the gas on the East side of the disc is moving towards us. In the same region where continuum emission is detected, we find an integrated line flux of 9.5±3.6 mJy km s −1 , corresponding to a CO mass of (1.4-13)×10 −6 M ⊕ . Our analysis confirms that the level of gas present in the disc is inconsistent with the presence of primordial gas in the system and is consistent with second generation production through the collisional cascade.

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Section: Nature Of the Compact Continuum Sourcessupporting

confidence: 79%

Section: Nature Of the Compact Continuum Sourcesmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

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Deep ALMA search for CO gas in the HD 95086 debris disc

Booth

Matrà

et al. 2018

Monthly Notices of the Royal Astronomical Society

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“…About a hundred debris disks have been spatially resolved to date, mostly in thermal emission at 70-160μm with the Herschel Space Observatory (e.g., Booth et al 2013;Eiroa et al 2013;Matthews et al 2014;Morales et al 2016;Vican et al 2016) or at submillimeter/millimeter wavelengths with JCMT (Holland et al 2017) and ALMA (e.g., MacGregor et al 2013, 2016aSu et al 2017). Using the measured radii of a sample of Herschel-resolved disks, Pawellek et al (2014) interestingly showed that the typical grain size in these disks does not directly scale with the radiative pressure blowout particle size, but decreases with stellar luminosity.…”

Section: Introductionmentioning

confidence: 99%

HD 104860 and HD 192758: Two Debris Disks Newly Imaged in Scattered Light with the Hubble Space Telescope

Choquet

Bryden

Perrin

et al. 2018

ApJ

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We present the first scattered-light images of two debris disks around the F8 star HD104860 and the F0V star HD192758, respectively ∼45 and ∼67pc away. We detected these systems in the F110W and F160W filters through our reanalysis of archival Hubble Space Telescope (HST) NICMOS data with modern starlight-subtraction techniques. Our image of HD104860 confirms the morphology previously observed by Herschel in thermal emission with a well-defined ring at a radius of ∼114au inclined by ∼58°. Although the outer edge profile is consistent with dynamical evolution models, the sharp inner edge suggests sculpting by unseen perturbers. Our images of HD192758 reveal a disk at radius ∼95au inclined by ∼59°, never resolved so far. These disks have low scattering albedos of 10% and 13%, respectively, inconsistent with water ice grain compositions. They are reminiscent of several other disks with similar inclination and scattering albedos: Fomalhaut, HD92945, HD202628, and HD207129. They are also very distinct from brighter disks in the same inclination bin, which point to different compositions between these two populations. Varying scattering albedo values can be explained by different grain porosities, chemical compositions, or grain size distributions, which may indicate distinct formation mechanisms or dynamical processes at work in these systems. Finally, these faint disks with large infrared excesses may be representative of an underlying population of systems with low albedo values. Searches with more sensitive instruments on HST or on the James Webb Space Telescope and using state-of-the art starlightsubtraction methods may help discover more of such faint systems.

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“…The HD 95086 and HD 145560 systems present cases in which there is clear evidence or a strong indication of a very extended disk with a central clearing or low dust density region. For HD 95086, the central clearing is large enough to make the disk undetected in scattered light within the limited GPI field-of-view while a large ring is imaged in wider field ALMA maps (Su et al 2017). Higher sensitivity wider field infrared imaging of these systems may detect lower surface brightness extended disks or halos.…”

Section: Compilation Of Infrared Scattered Light Disk Properties In Smentioning

confidence: 99%

First Resolved Scattered-light Images of Four Debris Disks in Scorpius-Centaurus with the Gemini Planet Imager

Hom

Patience

Espósito

et al. 2020

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We present the first spatially resolved scattered-light images of four debris disks around members of the Scorpius-Centaurus (Sco-Cen) OB Association with high-contrast imaging and polarimetry using the Gemini Planet Imager (GPI). All four disks are resolved for the first time in polarized light and one disk is also detected in total intensity. The three disks imaged around HD 111161, HD 143675, and HD 145560 are symmetric in both morphology and brightness distribution. The three systems span a range of inclinations and radial extents. The disk imaged around HD 98363 shows indications of asymmetries in morphology and brightness distribution, with some structural similarities to the HD 106906 planet-disk system. Uniquely, HD 98363 has a wide co-moving stellar companion Wray 15-788 with a recently resolved disk with very different morphological properties. HD 98363 A/B is the first binary debris disk system with two spatially resolved disks. All four targets have been observed with ALMA, and their continuum fluxes range from one non-detection to one of the brightest disks in the region. With the new results, a total of 15 A/F-stars in Sco-Cen have resolved scattered light debris disks, and approximately half of these systems exhibit some form of asymmetry. Combining the GPI disk structure results with information from the literature on millimeter fluxes and imaged planets reveals a diversity of disk properties in this young population. Overall, the four newly resolved disks contribute to the census of disk structures measured around A/F-stars at this important stage in the development of planetary systems.

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ALMA 1.3 mm Map of the HD 95086 System

Cited by 68 publications

References 58 publications

Deep ALMA search for CO gas in the HD 95086 debris disc

Deep ALMA search for CO gas in the HD 95086 debris disc

HD 104860 and HD 192758: Two Debris Disks Newly Imaged in Scattered Light with the Hubble Space Telescope

First Resolved Scattered-light Images of Four Debris Disks in Scorpius-Centaurus with the Gemini Planet Imager

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