<i>HERSCHEL</i>-RESOLVED OUTER BELTS OF TWO-BELT DEBRIS DISKS AROUND A-TYPE STARS: HD 70313, HD 71722, HD 159492, AND F-TYPE: HD 104860

Morales, Farisa Y.; Bryden, G.; Werner, M. W.; Stapelfeldt, K.

doi:10.1088/0004-637x/776/2/111

Cited by 38 publications

(55 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These values are consistent with the morphology of the disk observed at 100μm and 160μm by Morales et al (2013). We find a relatively low value for the Henyey-Greenstein parameter of anisotropic scattering, with =  | | g 0.17 0.13, indicative of grains favoring forward scattering.…”

Section: Hd104860 Analysissupporting

confidence: 89%

“…The disk was first resolved in thermal emission at 100 and 160μm with Herschel-PACS (Morales et al 2013) then marginally resolved at 1.3mm with CARMA (Steele et al 2016). The Herschel image at 100μm shows a disk of radius 116±6au, three times smaller than the radius inferred from SED modeling, and inclined by 54°±7°from face-on with a position angle (PA) of 1°±7°.…”

Section: Hd104860mentioning

confidence: 93%

“…They were identified through our reanalysis of archival coronagraphic data from the Hubble Space Telescope (HST) NICMOS instrument as part of the Archival Legacy Investigations of Circumstellar Environments (ALICE) project, 11 using modern starlight-subtraction techniques to reveal the faint disk emissions. The disk around HD104860 has been previously resolved in thermal emission with Herschel-PACS at 100 and 160μm (Morales et al 2013(Morales et al , 2016, but that around HD192758 has not been resolved so far. These two new detections bring the number of debris disks first imaged in scattered light by the ALICE program to 11, demonstrating the efficacy of our post-processing method in detecting faint resolved circumstellar material Choquet et al 2016Choquet et al , 2017.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Hd104860 Analysissupporting

confidence: 89%

Section: Hd104860mentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Self Cite

View full text Add to dashboard Cite

show abstract

“…Since small dust grains are not perfect blackbodies, it is not surprising that the actual resolved scattered light radius is larger than the inferred disk radius from the SED fitting (Booth et al 2013). The R disk /R BB ratio has been found to scale with luminosity due to radiation pressure more effectively blowing out the smaller grains, which have non-blackbody behavior (Morales et al 2013). Applying these relations to this star, we would expect the R disk to be 2-3 times that measured by the SED, which is about 108-162 AU, or right at the edge of the GPI FOV.…”

Section: Spectral Energy Distributionmentioning

confidence: 99%

The Peculiar Debris Disk of Hd 111520 as Resolved by the Gemini Planet Imager

Draper

Duchêne

Millar-Blanchaer

et al. 2016

ApJ

View full text Add to dashboard Cite

Using the Gemini Planet Imager, we have resolved the circumstellar debris disk around HD 111520 at a projected range of ∼30-100 AU in both total and polarized H-band intensity. The disk is seen edge-on at a position angle of 165°along the spine of emission. A slight inclination and asymmetric warp are covariant and alter the interpretation of the observed disk emission. We employ three point-spread function subtraction methods to reduce the stellar glare and instrumental artifacts to confirm that there is a roughly 2:1 brightness asymmetry between the NW and SE extension. This specific feature makes HD 111520 the most extreme example of asymmetric debris disks observed in scattered light among similar highly inclined systems, such as HD 15115 and HD 106906. We further identify a tentative localized brightness enhancement and scale height enhancement associated with the disk at ∼40 AU away from the star on the SE extension. We also find that the fractional polarization rises from 10% to 40% from 0 5 to 0 8 from the star. The combination of large brightness asymmetry and symmetric polarization fraction leads us to believe that an azimuthal dust density variation is causing the observed asymmetry.

show abstract

“…We compared our radius ratios to those of similar programs (Morales et al 2013, Booth et al 2013 in Figure 4. We find that, in most cases, f R increases for lower-luminosity stars.…”

Section: Disk Radiimentioning

confidence: 99%

Herschel Observations of Dusty Debris Disks

Vican

Schneider

Bryden

et al. 2016

ApJ

View full text Add to dashboard Cite

We present results from two Herschel observing programs using the Photodetector Array Camera and Spectrometer. During three separate campaigns, we obtained Herschel data for 24 stars at 70, 100, and 160 µm. We chose stars that were already known or suspected to have circumstellar dust based on excess infrared emission previously measured with IRAS or Spitzer, and used Herschel to examine long-wavelength properties of the dust. Fifteen stars were found to be uncontaminated by background sources, and possess infrared emission most likely due to a circumstellar debris disk. We analyzed the properties of these debris disks to better understand the physical mechanisms responsible for dust production and removal. Seven targets were spatially resolved in the Herschel images. Based on fits to their spectral energy distributions, nine disks appear to have two temperature components. Of these nine, in three cases, the warmer dust component is likely the result of a transient process rather than a steady state collisional cascade. The dust belts at four stars are likely stirred by an unseen planet, and merit further investigation.

show abstract

HERSCHEL-RESOLVED OUTER BELTS OF TWO-BELT DEBRIS DISKS AROUND A-TYPE STARS: HD 70313, HD 71722, HD 159492, AND F-TYPE: HD 104860

Cited by 38 publications

References 42 publications

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

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

The Peculiar Debris Disk of Hd 111520 as Resolved by the Gemini Planet Imager

Herschel Observations of Dusty Debris Disks

Contact Info

Product

Resources

About