High Contrast Imaging of the Close Environment of HD 142527 -

Abstract

Context. It has long been suggested that circumstellar disks surrounding young stars may be the signposts of planets, and still more since the recent discoveries of embedded substellar companions. The planet-disk interaction may create, according to models, large structures, gaps, rings or spirals, in the disk. In that sense, the Herbig star HD 142527 is particularly compelling as, its massive disk displays intriguing asymmetries that suggest the existence of a dynamical peturber of unknown nature. Aims. Our goal was to obtain deep thermal images of the close circumstellar environment of HD 142527 to re-image the reported close-in structures (cavity, spiral arms) of the disk and to search for stellar and substellar companions that could be connected to their presence. Results. The circumstellar environment of HD 142527 is revealed at an unprecedented spatial resolution down to the sub arcsecond level for the first time at 3.8 microns. Our images reveal important radial and azimuthal asymmetries which invalidate an elliptical shape for the disk as previously proposed. It rather suggests a bright inhomogeneous spiral arm plus various fainter spiral arms. We also confirm an inner cavity down to 30 AU and two important dips at position angles of 0 and 135 deg. The detection performance in angular differential imaging enables the exploration of the planetary mass regime for projected physical separations as close as 40 AU. The use of our detection map together with Monte Carlo simulations sets stringent constraints on the presence of planetary mass, brown dwarf or stellar companions as a function of the semi-major axis. They severely constrain the presence of massive giant planets with semi-major axis beyond 50AU, i.e. probably within the large disk's cavity that radially extends up to 145 AU or even further outside.

8 pages, 7 figures, accepted in A&A

References in corpus (11)

• Direct Imaging of Multiple Planets Orbiting the Star HR 8799
• Optical Images of an Exosolar Planet 25 Light Years from Earth
• The Two Modes of Gas Giant Planet Formation
• Direct Imaging and Spectroscopy of a Planetary Mass Candidate Companion to a Young Solar Analog
• Impact of angular differential imaging on circumstellar disk images
• A Likely Close-In Low-Mass Stellar Companion to the Transitional Disk Star HD 142527
• A novel L-band imaging search for giant planets in the Tucana and Beta Pictoris moving groups
• Outer edges of debris discs: how sharp is sharp?
• The dynamically disrupted gap in HD 142527
• The Asymmetric Thermal Emission of Protoplanetary Disk Surrounding HD 142527 Seen by Subaru/COMICS
• An insight in the surroundings of HR4796

Cited by in corpus (45)

• Asymmetric features in the protoplanetary disk MWC758
• Shadows cast by a warp in the HD 142527 protoplanetary disk
• Spiral Arms in the Asymmetrically Illuminated Disk of MWC 758 and Constraints on Giant Planets
• Structures in the protoplanetary disk of HD142527 seen in polarized scattered light
• Close-in planetesimal formation by pile-up of drifting pebbles
• Shadows cast on the transition disk of HD 135344B. Multiwavelength VLT/SPHERE polarimetric differential imaging
• Local Enhancement of Surface Density in the Protoplanetary Ring Surrounding HD 142527
• Three Wide Planetary-Mass Companions to FW Tau, ROXs 12, and ROXs 42B
• Asymmetric transition disks: Vorticity or eccentricity?
• An Enigmatic Pointlike Feature within the HD 169142 Transitional Disk
• Spiral arms in the disk of HD 142527 from CO emission lines with ALMA
• A compact concentration of large grains in the HD142527 protoplanetary dust trap
• A Close-up View of the Young Circumbinary Disk HD 142527
• Inferring Planet Mass from Spiral Structures in Protoplanetary Disks
• Exploring dust around HD142527 down to 0.025" / 4au using SPHERE/ZIMPOL
• CO gas inside the protoplanetary disk cavity in HD 142527: disk structure from ALMA
• Scattered light images of spiral arms in marginally gravitationally unstable discs with an embedded planet
• Near-Infrared Imaging Polarimetry of HD142527
• Fast Radial Flows in Transition Disk Holes
• Spiral Arms in Disks: Planets or Gravitational Instability?
• Two Different Grain Size Distributions within the Protoplanetary Disk around HD 142527 Revealed by ALMA Polarization Observation
• Multiple spiral patterns in the transitional disk of HD 100546
• SEEDS Adaptive Optics Imaging of the Asymmetric Transition Disk Oph IRS 48 in Scattered Light
• Characterization of the gaseous companion κ Andromedae b: New Keck and LBTI high-contrast observations
• Sculpting the disk around T Cha: an interferometric view
• SPHERE dynamical and spectroscopic characterization of HD142527B
• How large are the monomers of dust aggregates in planet-forming disks?: Insights from quantitative optical and near-infrared polarimetry
• Resolving structure of the disk around HD100546 at 7 mm with ATCA
• ISPY -- NACO Imaging Survey for Planets around Young stars: Survey description and results from the first 2.5 years of observations
• Stellar parameters and accretion rate of the transition disk star HD 142527 from X-Shooter
• Significant Gas-to-Dust Ratio Asymmetry and Variation in the Disk of HD 142527 and the Indication of Gas Depletion
• The abundance and thermal history of water ice in the disk surrounding HD142527 from the DIGIT Herschel Key Program
• Spatially resolved HCN J=4--3 and CS J=7--6 emission from the disk around HD 142527
• Characterization of low-mass companion HD 142527 B
• ISPY-NACO Imaging Survey for Planets around Young stars. The demographics of forming planets embedded in protoplanetary disks
• Low Level Carbon Monoxide Line Polarization in two Protoplanetary Disks: HD 142527 and IM Lup
• The water-ice feature in near-infrared disk-scattered light around HD 142527: Micron-sized icy grains lifted up to the disk surface?
• Near-Infrared Imaging of a Spiral in the CQ Tau Disk
• Lessons for WFIRST CGI from ground-based high-contrast systems
• Dynamical signatures of Rossby vortices in cavity-hosting disks
• High-contrast imaging constraints on gas giant planet formation - The Herbig Ae/Be star opportunity
• A model grid for the reflected light from transition disks
• A Dust Trap in the Young Multiple System HD 34700
• Very Large Telescope observations of Gomez's Hamburger: Insights into a young protoplanet candidate
• Early High-contrast Imaging Results with Keck/NIRC2-PWFS: The SR 21 Disk