HST/NICMOS2 coronagraphic observations of the circumstellar environment of three old PMS stars: HD 100546, SAO 206462 and MWC 480

Abstract

The close environment of four old Pre-Main Sequence stars has been observed thanks to the coronagraphic mode of the HST/NICMOS2 camera at lambda=1.6 micron. In the course of this program, the detection of a circumstellar annulus around HD 141569 has already been presented in Augereau et al.(1999b). In this paper, we report the detection of an elliptical structure around the Herbig Be star HD 100546 extending from the very close edge of the coronagraphic mask (~50 AU) to 350-380 AU (3.5-3.8 arcsec) from the star. The axis ratio gives a disk inclination of 51+/-3 degrees to the line-of-sight and a position angle of 161+/-5 degrees, measured east of north. At 50 AU, the disk has a surface brightness between 10.5 and 11 mag/arcsec^2, then follows a -2.92+/-0.04 radial power law up to 250-270 AU and finally falls as r^{-5.5+/-0.2}. The inferred optical thickness suggests that the disk is at least marginally optically thick inside 80 AU and optically thin further out. Combined with anisotropic scattering properties, this could explain the shape of a brightness asymmetry observed along the minor axis of the disk. This asymmetry needs to be confirmed. The circumstellar disks around SAO 206462 and MWC 480 are not resolved, leading to constraints on the dust distribution. A tight binary system separated by only 0.32+/-0.04 arcsec is nevertheless detected in the close vicinity of SAO 206462.

13 pages, accepted for publication in Astronomy & Astrophysics

References in corpus (5)

• Detection of Planetary Transits Across a Sun-like Star
• HST/NICMOS Imaging of Disks and Envelopes Around Very Young Stars
• The Circumstellar Disk of HD 141569 Imaged with NICMOS
• The Age of Beta Pic
• Dust Emission from Herbig Ae/Be stars - Evidence for Disks and Envelopes

Cited by in corpus (72)

• The effect of dust settling on the appearance of protoplanetary disks
• A 10 micron spectroscopic survey of Herbig Ae star disks: grain growth and crystallization
• CO emission from discs around isolated HAeBe and Vega-excess stars
• LkH$\alpha$ 330: Evidence for dust clearing through resolved submillimeter imaging
• Evidence for dust clearing through resolved submillimeter imaging
• A young protoplanet candidate embedded in the circumstellar disk of HD100546
• Volatile carbon locking and release in protoplanetary disks. A study of TW Hya and HD 100546
• The origin of crystalline silicates in the Herbig Be star HD100546 and in comet Hale-Bopp
• [O I] 6300A emission in Herbig Ae/Be systems: signature of Keplerian rotation
• Resolving the inner dust disks surrounding LkCa 15 and MWC 480 at mm wavelengths
• The mass ratio distribution of B-type visual binaries in the Sco OB2 association
• The complex structure of the disk around HD100546: the inner few astronomical units
• ALMA hints at the presence of two companions in the disk around HD 100546
• Evolution of protoplanetary disks from their taxonomy in scattered light: spirals, rings, cavities, and shadows
• The SPHERE view of the planet-forming disk around HD100546
• Spatially extended PAHs in circumstellar disks around T Tauri and Herbig Ae stars
• Tracing the inner edge of the disk around HD 100546 with Ro-vibrational CO Emission Lines
• Complex Spiral Structure in the HD 100546 Transitional Disk as Revealed by GPI and MagAO
• Why circumstellar disks are so faint in scattered light: The case of HD 100546
• VLT/NACO Polarimetric Differential Imaging of HD100546 - Disk Structure and Dust Grain Properties between 10-140 AU
• Resolving the disk rotation of HD 97048 and HD 100546 in the [O I] 6300A line: evidence for a giant planet orbiting HD 100546
• On the origin of the X-ray emission from Herbig Ae/Be stars
• Probing the circumstellar structures of T Tauri stars and their relationship to those of Herbig stars
• The 2-D structure of dusty disks around Herbig Ae/Be stars, I. Models with grey opacities
• HD100546 Multi-Epoch Scattered-Light Observations
• A sub-millimeter Mapping Survey of Herbig AeBe Stars
• Observations of Solids in Protoplanetary Disks
• Searching for a link between the magnetic nature and other observed properties of Herbig Ae/Be stars and stars with debris disks
• Spiral Arms in Disks: Planets or Gravitational Instability?
• Constraining the structure of the planet-forming region in the disk of the Herbig Be star HD 100546
• A search for accreting young companions embedded in circumstellar disks: High-contrast H$\alpha$ imaging with VLT/SPHERE
• On the gas temperature in circumstellar disks around A stars
• First results of the Herschel Key Program 'Dust, Ice and Gas in Time': Dust and Gas Spectroscopy of HD 100546
• Multiple spiral patterns in the transitional disk of HD 100546
• Disks around the Young Stars TW Hya and HD 100546 Imaged at 3.4 Millimeters with the Australia Telescope Compact Array
• Spatially resolved PAH emission in the inner disks of Herbig Ae/Be stars
• Near infrared and the inner regions of protoplanetary disks
• Chemical analysis of 24 dusty (pre-)main-sequence stars
• The SEEDS High Contrast Imaging Survey of Exoplanets around Young Stellar Objects
• Polycyclic Aromatic Hydrocarbon in Protoplanetary Disks around Herbig Ae/Be and T Tauri Stars
• Adaptive Optics Imaging of the AU Microscopii Circumstellar Disk: Evidence for Dynamical Evolution
• HD 135344B: a young star has reached its rotational limit
• Warm molecular gas and kinematics in the disc around HD 100546
• Resolved images of the protoplanetary disk around HD 100546 with ALMA
• A Resolved Circumstellar Disk around the Herbig Ae Star HD 100546 in the Thermal Infrared
• High-Contrast NIR Polarization Imaging of MWC480
• Low abundance, strong features: Window-dressing crystalline forsterite in the disk wall of HD 100546
• Resolving HD 100546 disc in the mid-infrared: Small inner disc and asymmetry near the gap
• Resolving structure of the disk around HD100546 at 7 mm with ATCA
• Ground-based near-infrared imaging of the HD141569 circumstellar disk
• High-Contrast study of the candidate planets and protoplanetary disk around HD~100546
• First Two-Micron Imaging Polarimetry of Beta Pictoris
• High-Resolution Near Infrared Spectroscopy of HD 100546: II. Analysis of variable rovibrational CO emission lines
• Molecular hydrogen in the circumstellar environments of Herbig Ae/Be stars probed by FUSE
• The Warped Circumstellar Disk of HD100546
• Observational Possibility of the "Snow Line" on the Surface of Circumstellar Disks with the Scattered Light
• FUSE observations of H2 around the Herbig AeBe stars HD 100546 and HD 163296
• Is the HD 15115 inner disk really asymmetrical ?
• Flaring and self-shadowed disks around Herbig Ae stars: simulations for 10 micron interferometers
• HD 97048's Circumstellar Environment as Revealed by a HST/ACS Coronagraphic Study of Disk Candidate Stars
• Line emission from circumstellar disks around A stars
• The protoplanetary system HD 100546 in H$\alpha$ polarized light from SPHERE/ZIMPOL. A bar-like structure across the disk gap?
• The far-infrared behaviour of Herbig Ae/Be discs: Herschel PACS photometry
• Nano carbon dust emission in proto-planetary disks: the aliphatic-aromatic components
• First Resolved Scattered-Light Images of Four Debris Disks in Scorpius-Centaurus with the Gemini Planet Imager
• Where is the warm H2 ? A search for H2 emission from disks around Herbig Ae/Be stars
• On the asymmetry of the OH ro-vibrational lines in HD 100546
• High-contrast imaging constraints on gas giant planet formation - The Herbig Ae/Be star opportunity
• Near-Infrared Photometric Survey of Herbig Ae/Be Candidate Stars
• Spatial distribution of the aromatic and aliphatic carbonaceous nano-grain features in the protoplanetary disk around HD 100546
• The Disk Atmospheres of Three Herbig Ae/Be Stars
• The Disks In Scorpius-Centaurus Survey (DISCS) I: Four Newly-Resolved Debris Disks in Polarized Intensity Light