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200 papers

The spatially resolved AU Mic debris disc is among the most famous and best-studied debris discs. We aim at a comprehensive understanding of the dust production and the dynamics of the disc objects with in depth collisional modelling…

Earth and Planetary Astrophysics · Physics 2015-09-16 Ch. Schüppler , T. Löhne , A. V. Krivov , S. Ertel , J. P. Marshall , S. Wolf , M. C. Wyatt , J. -C. Augereau , S. A. Metchev

We investigate the nature of the innermost regions of seven circumstellar disks around pre-main-sequence stars. Our object sample contains disks apparently at various stages of their evolution. Both single stars and spatially resolved…

Solar and Stellar Astrophysics · Physics 2015-05-13 A. A. Schegerer , S. Wolf , C. A. Hummel , S. P. Quanz , A. Richichi

We present new sub-arcsecond (0.7'') Combined Array for Research in Millimeter-wave Astronomy (CARMA) observations of the 1.3 mm continuum emission from circumstellar disks around 11 low and intermediate mass pre-main sequence stars. High…

Solar and Stellar Astrophysics · Physics 2009-07-24 Andrea Isella , John M. Carpenter , Anneila I. Sargent

PDS 70b is the most robustly detected young planet imaged in the gap of a transition disk so far, found at a separation of ~195 mas (~22 au) from its host star and at a position angle of about 155 deg. This system is therefore a unique…

We have obtained Spitzer IRS 5.5 - 35 micron spectroscopy of the debris disk around beta Pictoris. In addition to the 10 micron silicate emission feature originally observed from the ground, we also detect the crystalline silicate emission…

The disk around the Herbig Ae/Be star HD 100546 has been extensively studied and it is one of the systems for which there are observational indications of ongoing and/or recent planet formation. However, up until now no resolved image of…

Solar and Stellar Astrophysics · Physics 2015-06-19 Jaime E. Pineda , Sascha P. Quanz , Farzana Meru , Gijs D. Mulders , Michael R. Meyer , Olja Panić , Henning Avenhaus

We present ALMA observations of the 0.88 millimeter dust continuum, 13CO, and C18O J=3-2 line emission of the circumbinary disk HD142527 at a spatial resolution of about 0.25". This system is characterized by a large central cavity of…

Earth and Planetary Astrophysics · Physics 2017-05-10 Y. Boehler , E. Weaver , A. Isella , L. Ricci , C. Grady , J. Carpenter , L. Perez

FN Tau is a rare example of very low-mass T Tauri stars that exhibits a spatially resolved nebulosity in near-infrared scattering light. To directly derive the parameters of a circumstellar disk around FN Tau, observations of dust continuum…

Astrophysics of Galaxies · Physics 2015-05-18 Munetake Momose , Nagayoshi Ohashi , Tomoyuki Kudo , Motohide Tamura , Yoshimi Kitamura

We analyse Herschel/SPIRE images of the edge-on spiral galaxy NGC 891 at 250, 350 and 500 micron. Using a 3D radiative transfer model we confirm that the dust has a radial fall-off similar to the stellar disk. The dust disk shows a break at…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-28 Simone Bianchi , Emmanuel Xilouris

Debris disks can be seen as the left-overs of giant planet formation and the possible nurseries of rocky planets. While M-type stars out-number more massive stars we know very little about the time evolution of their circumstellar disks at…

We present detailed modeling of the spatial distributions of gas and dust in 57 circumstellar disks in the Upper Scorpius OB Association observed with ALMA at sub-millimeter wavelengths. We fit power-law models to the dust surface density…

Solar and Stellar Astrophysics · Physics 2017-12-27 Scott A. Barenfeld , John M. Carpenter , Anneila I. Sargent , Andrea Isella , Luca Ricci

Context. Circumstellar discs are the places where planets form, therefore knowledge of their evolution is crucial for our understanding of planet formation. The Herschel Space Observatory is providing valuable data for studying disc…

The recent findings of gas giant planets around young A-type stars suggest that disks surrounding Herbig Ae/Be stars will develop planetary systems. An interesting case is HD142527, for which previous observations revealed a complex…

In this first paper in a series we present a study of the global dust emission distribution in nearby edge-on spiral galaxies. Our sample consists of 16 angularly large and 13 less spatially resolved galaxies selected from the DustPedia…

There have been several model analyses of the near and mid IR flux from the circumstellar ring around HR4796A. In the vicinity of a young star, the possibility that the dust ring is embedded within a residual protostellar gas disk cannot be…

Astrophysics · Physics 2009-10-31 Hubert Klahr , D. N. C. Lin

We report on observations performed at 1.25 $mm$ of a southern galaxy sample, selected from the IRAS PSC and complete to $S_{60}=2 Jy$. We detected 18 sources and set significant limits on 10 further objects. We use these data to discuss…

Astrophysics · Physics 2009-10-22 A. Franceschini , P. Andreani

Two thirds of the F star members of the 12 Myr old Beta Pictoris Moving Group (BPMG) show significant excess emission in the mid-infrared, several million years after the expected dispersal of the protoplanetary disc. Theoretical models of…

Solar and Stellar Astrophysics · Physics 2015-05-19 Laura J. Churcher , Mark C. Wyatt , Rachel Smith

We report the discovery of a circumstellar disk around the young A0 star, HR 4796, in thermal infrared imaging carried out at the W.M. Keck Observatory. By fitting a model of the emission from a flat dusty disk to an image at lambda=20.8…

Astrophysics · Physics 2009-10-30 D. W. Koerner , M. E. Ressler , M. W. Werner , D. E. Backman

We conducted a detailed radiative transfer modeling of the dust emission from the circumstellar disk around HL Tau. The goal of our study is to derive the surface density profile of the inner disk and its structure. In addition to the…

We present ALMA observations of the Class 0 protostar IRAS 04166+2706, obtained as part of the ALMA large program Early Planet Formation in Embedded Disks (eDisk). These observations were made in the 1.3 mm dust continuum and molecular…

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