An M-dwarf star in the transition disk of Herbig HD 142527; Physical parameters and orbital elements

Abstract

HD 142527A is one of the most studied Herbig Ae/Be stars with a transitional disk, as it has the largest imaged gap in any protoplanetary disk: the gas is cleared from 30 to 90 AU. The HD142527 system is also unique in that it has a stellar companion with a small mass compared to the mass of the primary star. This factor of ~20 in mass ratio between the two objects makes this binary system different from any other YSO. The HD142527 system could therefore provide a valuable test bed. This low-mass stellar object may be responsible for both the gap and dust trapping observed by ALMA at longer distances. We observed this system with the NACO and GPI instruments using the aperture masking technique. Aperture masking is ideal for providing high dynamic range even at very small angular separations. We present the spectral energy distribution for HD142527A and B. Brightness of the companion is now known from the R band up to the M' band. We also followed the orbital motion of HD 142527B over a period of more than two years. The SED of the companion is compatible with a T=3000+/-100K object in addition to a 1700K blackbody environment (likely a circus-secondary disk). From evolution models, we find that it is compatible with an object of mass 0.13+/-0.03Msun, radius 0.90+/-0.15Rsun, and age $1.0_{-0.75}^{+1.0}$Myr. This age is significantly younger than the age previously estimated for HD142527A. Computations to constrain the orbital parameters found a semi major axis of $140_{-70}^{+120}$mas, an eccentricity of 0.5+/-0.2, an inclination of 125+/-15 degrees, and a position angle of the right ascending node of -5+/-40 degrees. Inclination and position angle of the ascending node are in agreement with an orbit coplanar with the inner disk, not coplanar with the outer disk. Despite its high eccentricity, it is unlikely that HD142527B is responsible for truncating the inner edge of the outer disk.

arXiv commentpublished in A&A; 8 pages

References in corpus (31)

• Astropy: A Community Python Package for Astronomy
• emcee: The MCMC Hammer
• Validation of the new Hipparcos reduction
• Dust Grain Size Distributions and Extinction in the Milky Way, LMC, and SMC
• New evolutionary models for pre-main sequence and main sequence low-mass stars down to the hydrogen-burning limit
• A Hipparcos census of the nearby OB associations
• Protoplanetary Disks and Their Evolution
• Models of Stars, Brown Dwarfs and Exoplanets
• Towards Better Age Estimates for Stellar Populations: The Y^2 Isochrones for Solar Mixture
• A Major Asymmetric Dust Trap in a Transition Disk
• Observations of gas flows inside a protoplanetary gap
• The Y^2 Stellar Evolutionary Tracks
• Shadows cast by a warp in the HD 142527 protoplanetary disk
• Episodic accretion at early stages of evolution of low mass stars and brown dwarfs: a solution for the observed luminosity spread in HR diagrams?
• Structures in the protoplanetary disk of HD142527 seen in polarized scattered light
• A Likely Close-In Low-Mass Stellar Companion to the Transitional Disk Star HD 142527
• Observed luminosity spread in young clusters and Fu Ori stars: a unified picture
• STIS Coronagraphic Imaging of Fomalhaut: Main Belt Structure and the Orbit of Fomalhaut b
• Comments on Inferences of Star Formation Histories and Birthlines
• Discovery of H-alpha Emission from the Close Companion Inside the Gap of Transitional Disk HD142527
• Accretion kinematics through the warped transition disk in HD142527 from resolved CO(6-5) observations
• The complex circumstellar environment of HD142527
• A compact concentration of large grains in the HD142527 protoplanetary dust trap
• CO gas inside the protoplanetary disk cavity in HD 142527: disk structure from ALMA
• Sparse aperture masking at the VLT I. Faint companion detection limits for the two debris disk stars HD 92945 and HD 141569
• A kinematic study and membership analysis of the Lupus star-forming region
• Polarized Light Imaging of the HD 142527 Transition Disk with the Gemini Planet Imager: Dust around the Close-in Companion
• Stellar parameters and accretion rate of the transition disk star HD 142527 from X-Shooter
• Constraining the orbits of sub-stellar companions imaged over short orbital arcs
• Gemini Planet Imager Observational Calibrations IV: Wavelength Calibration and Flexure Correction for the Integral Field Spectrograph
• Sparse Aperture Masking (SAM) at NAOS/CONICA on the VLT

Cited by in corpus (74)

• Imaging Extrasolar Giant Planets
• Shadows and spirals in the protoplanetary disk HD 100453
• Circumbinary, not transitional: On the spiral arms, cavity, shadows, fast radial flows, streamers and horseshoe in the HD142527 disc
• Dust depleted inner disks in a large sample of transition disks through long-baseline ALMA observations
• The Ophiuchus DIsc Survey Employing ALMA (ODISEA)-III: the evolution of substructures in massive discs at 3-5 au resolution
• Characterization of exoplanets from their formation III: The statistics of planetary luminosities
• On the origin of horseshoes in transitional discs
• The Degree of Alignment Between Circumbinary Disks and Their Binary Hosts
• Signatures of broken protoplanetary discs in scattered light and in sub-millimetre observations
• On the diversity of asymmetries in gapped protoplanetary disks
• Discovery of a point-like source and a third spiral arm in the transition disk around the Herbig Ae star MWC 758
• A Close-up View of the Young Circumbinary Disk HD 142527
• ALMA observations of the $\eta$ Corvi debris disc: inward scattering of CO-rich exocomets by a chain of 3-30 M${}_{\oplus }$ planets?
• Exploring dust around HD142527 down to 0.025" / 4au using SPHERE/ZIMPOL
• An inner warp in the DoAr 44 T Tauri transition disk
• Inclined Massive Planets in a Protoplanetary Disc: Gap Opening, Disc Breaking, and Observational Signatures
• Inclination Evolution of Protoplanetary Disks Around Eccentric Binaries
• Spiral Arms in Disks: Planets or Gravitational Instability?
• A search for accreting young companions embedded in circumstellar disks: High-contrast H$\alpha$ imaging with VLT/SPHERE
• Two Different Grain Size Distributions within the Protoplanetary Disk around HD 142527 Revealed by ALMA Polarization Observation
• Variable Outer Disk Shadowing Around the Dipper Star RX J1604.3-2130
• Shadowing and multiple rings in the protoplanetary disk of HD 139614
• Polycyclic Aromatic Hydrocarbon in Protoplanetary Disks around Herbig Ae/Be and T Tauri Stars
• Separating extended disc features from the protoplanet in PDS 70 using VLT/SINFONI
• A population of transition disks around evolved stars: Fingerprints of planets? Catalog of disks surrounding Galactic post-AGB binaries
• Signatures of an eccentric disc cavity: Dust and gas in IRS 48
• SPHERE dynamical and spectroscopic characterization of HD142527B
• The mass and size of Herbig disks as seen by ALMA
• Transition disks: the observational revolution from SEDs to imaging
• Save the Planet, Feed the Star: How Super-Earths Survive Migration and Drive Disk Accretion
• Generating large misalignments in gapped and binary discs
• ALMA Reveals a Misaligned Inner Gas Disk inside the Large Cavity of a Transitional Disk
• Long-term Evolution of Binary Orbits Induced by Circumbinary Disks
• The abundance and thermal history of water ice in the disk surrounding HD142527 from the DIGIT Herschel Key Program
• The Planetary Luminosity Problem: "Missing Planets" and the Observational Consequences of Episodic Accretion
• Characterizing the protolunar disk of the accreting companion GQ Lupi B
• Circumbinary and circumstellar discs around the eccentric binary IRAS 04158+2805 -- a testbed for binary-disc interaction
• HD 143006: circumbinary planet or misaligned disc?
• What happened before? -- The disks around the precursors of young Herbig Ae/Be stars
• Non-Keplerian spirals, a gas-pressure dust trap and an eccentric gas cavity in the circumbinary disc around HD 142527
• Rocking shadows in broken circumbinary discs
• Dusty clumps in circumbinary discs
• Binary-induced spiral arms inside the disc cavity of AB Aurigae
• Characterization of low-mass companion HD 142527 B
• The Architecture of the GW Ori Young Triple Star System and Its Disk: Dynamical Masses, Mutual Inclinations, and Recurrent Eclipses
• Structure of a protobinary system: an asymmetric circumbinary disk and spiral arms
• ISPY-NACO Imaging Survey for Planets around Young stars. The demographics of forming planets embedded in protoplanetary disks
• Investigating the asymmetric chemistry in the disk around the young star HD 142527
• The protoplanetary system HD 100546 in H$\alpha$ polarized light from SPHERE/ZIMPOL. A bar-like structure across the disk gap?
• The Near Infrared Imager and Slitless Spectrograph for the James Webb Space Telescope -- IV. Aperture Masking Interferometry
• Dust Traps and the Formation of Cavities in Transition Discs: A millimetre to sub-millimetre comparison survey
• 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?
• Investigating the gas-to-dust ratio in the protoplanetary disk of HD 142527
• Kinematical signs of dust trapping and feedback in a local pressure bump in the protoplanetary disk around HD 142527 revealed with ALMA
• Interferometric study on the temporal variability of the brightness distributions of protoplanetary disks
• On the frequencies of circumbinary discs in protostellar systems
• The protoplanetary disc around HD 169142: circumstellar or circumbinary?
• An extended scattered light disk around AT Pyx -- Possible planet formation in a cometary globule
• Observational Signatures of Circumbinary Discs I: Kinematics
• SUBARU Near-Infrared Imaging Polarimetry of Misaligned Disks Around The SR24 Hierarchical Triple System
• A Dust Trap in the Young Multiple System HD 34700
• Discovery of an M-type Companion to the Herbig Ae Star V1787 Ori
• Astrometric view of companions in the inner dust cavities of protoplanetary disks
• Simulation of the Free Fall of a Gas Stream on a Protoplanetary Disk
• The Circumbinary Disk of HD 34700A: I. CO gas kinematics indicate spirals, infall, and vortex motions
• Mid-infrared Multi-wavelength Imaging of Ophiuchus\,IRS\,48\,Transitional Disk
• Variability of the Great Disk Shadow in Serpens
• Performance of the Gemini Planet Imager Non-Redundant Mask and spectroscopy of two close-separation binaries HR 2690 and HD 142527
• Polarimetric differential imaging with VLT/NACO. A comprehensive PDI pipeline for NACO data (PIPPIN)
• Evolutionary Status of T Tauri Stars
• The asymmetric structure of the inner disc around HD 142527 A with VLTI/MATISSE
• Dynamical Stability of Polar Circumbinary Orbits and Planet-Formation in Planetary Disc of 99 Herculis
• The Circumbinary Disc of HD 34700A II. Analysis of a strong dust asymmetry