A Layered Debris Disk around M Star TWA 7 in Scattered Light

Abstract

We have obtained Hubble Space Telescope (HST) coronagraphic observations of the circumstellar disk around M star TWA 7 using the STIS instrument in visible light. Together with archival observations including HST/NICMOS using the F160W filter and Very Large Telescope/SPHERE at $H$-band in polarized light, we investigate the system in scattered light. By studying this nearly face-on system using geometric disk models and Henyey--Greenstein phase functions, we report new discovery of a tertiary ring and a clump. We identify a layered architecture: three rings, a spiral, and an $\approx 150$ au${}^2$ elliptical clump. The most extended ring peaks at $28$ au, and the other components are on its outskirts. Our point source detection limit calculations demonstrate the necessity of disk modeling in imaging fainter planets. Morphologically, we witness a clockwise spiral motion, and the motion pattern is consistent with both solid body and local Keplerian; we also observe underdensity regions for the secondary ring that might result from mean motion resonance or moving shadows: both call for re-observations to determine their nature. Comparing multi-instrument observations, we obtain blue STIS-NICMOS color, STIS-SPHERE radial distribution peak difference for the tertiary ring, and high SPHERE-NICMOS polarization fraction; these aspects indicate that TWA 7 could retain small dust particles. By viewing the debris disk around M star TWA 7 at a nearly face-on vantage point, our study allows for the understanding of such disks in scattered light in both system architecture and dust property.

arXiv comment20 pages, 10 figures, 3 tables, ApJ accepted. Data and animation available in the ancillary folder. Citation fixed, author list updated

References in corpus (66)

• emcee: The MCMC Hammer
• Gaia Data Release 2. Summary of the contents and survey properties
• Planet Occurrence within 0.25 AU of Solar-type Stars from Kepler
• Detection and Characterization of Exoplanets and Disks using Projections on Karhunen-Loeve Eigenimages
• The TESS Input Catalog and Candidate Target List
• Very Low Mass Stars and Brown Dwarfs in Taurus-Auriga
• New Mass Loss Measurements from Astrospheric Lyman-alpha Absorption
• An Optical Spectroscopic Study of T Tauri Stars. I. Photospheric Properties
• Accretion in Brown Dwarfs: an Infrared View
• The Luminosity & Mass Function of the Trapezium Cluster: From B stars to the Deuterium Burning Limit
• Spectral and Photometric Diagnostics of Giant Planet Formation Scenarios
• Search for Associations Containing Young stars (SACY): I. Sample & Searching Method
• Stellar Multiplicity and the IMF: Most Stars Are Single
• Discovery of a large dust disk around the nearby star AU Microscopium
• Dust Dynamics, Surface Brightness Profiles, and Thermal Spectra of Debris Disks: The Case of AU Mic
• Polarimetry with the Gemini Planet Imager: Methods, Performance at First Light, and the Circumstellar Ring around HR 4796A
• Detection and Characterization of Exoplanets using Projections on Karhunen-Loeve Eigenimages: Forward Modeling
• The TRENDS High-Contrast Imaging Survey. IV. The Occurrence Rate of Giant Planets around M-Dwarfs
• X-Shooter spectroscopy of young stellar objects: II. Impact of chromospheric emission on accretion rate estimates
• Predictions for the secondary CO, C and O gas content of debris discs from the destruction of volatile-rich planetesimals
• Where Are The M Dwarf Disks Older Than 10 Million Years?
• $\beta$ Pictoris' inner disk in polarized light and new orbital parameters for $\beta$ Pictoris b
• The polarimetric imaging mode of VLT/SPHERE/IRDIS II: Characterization and correction of instrumental polarization effects
• Infrared Views of the TW Hya Disk
• Analysis of the Herschel DEBRIS Sun-like star sample
• Non-negative Matrix Factorization: Robust Extraction of Extended Structures
• A Far-ultraviolet Atlas of Low-resolution Hubble Space Telescope Spectra of T Tauri Stars
• Outer edges of debris discs: how sharp is sharp?
• An Infrared Coronagraphic Survey for Substellar Companions
• Chasing Shadows: Rotation of the Azimuthal Asymmetry in the TW Hya Disk
• First images of debris disks around TWA 7, TWA 25, HD 35650, and HD 377
• Revealing Asymmetries in the HD 181327 Debris Disk: A Recent Massive Collision or ISM Warping
• Keck/NIRC2 $L$'-Band Imaging of Jovian-Mass Accreting Protoplanets around PDS 70
• A Primer on Unifying Debris Disk Morphologies
• SPHERE IRDIS and IFS astrometric strategy and calibration
• BANYAN. IX. The Initial Mass Function and Planetary-Mass Object Space Density of the TW Hya Association
• Vertical structure of debris discs
• How Spirals and Gaps Driven by Companions in Protoplanetary Disks Appear in Scattered Light at Arbitrary Viewing Angles
• The Detectability of Exo-Earths and Super-Earths Via Resonant Signatures in Exozodiacal Clouds
• On the AU Mic debris disk: density profiles, grain properties and dust dynamics
• The effect of dust composition and shape on radiation-pressure forces and blowout sizes of particles in debris disks
• Collisional modelling of the AU Microscopii debris disc
• Saturn's G and D rings provide nearly complete measured scattering/phase functions of nearby debris disks
• On the Ubiquity and Stellar Luminosity Dependence of Exocometary CO Gas: Detection around M Dwarf TWA 7
• Mass and Temperature of the TWA 7 Debris Disk
• An Exo-Kuiper Belt and An Extended Halo around HD 191089 in Scattered Light
• Resolving faint structures in the debris disk around TWA7
• Gas and dust in the TW Hydrae Association as seen by the Herschel Space Observatory
• Formation of Gaps in Self-Gravitating Debris Disks by Secular Resonance in a Single-planet System I: A Simplified Model
• The HIP 79977 debris disk in polarized light
• Dynamical Evidence of a Spiral Arm--Driving Planet in the MWC 758 Protoplanetary Disk
• A $75\%$ Occurrence Rate of Debris Discs around F stars in the $\beta$ Pic Moving Group
• An exact, generalised Laplace resonance in the HR 8799 planetary system
• New disk discovered with VLT/SPHERE around the M star GSC 07396-00759
• The HR 4796A Debris System: Discovery of Extensive Exo-Ring Dust Material
• HST Scattered Light Imaging and Modeling of the Edge-on Protoplanetary Disk ESO-H$\alpha$ 569
• Archival Legacy Investigations of Circumstellar Environments: Overview and First Results
• Stellar Winds and Dust Avalanches in the AU Mic Debris Disk
• A Decade of MWC 758 Disk Images: Where Are the Spiral-Arm-Driving Planets?
• Observability of Debris Discs around M-stars
• Coronal Mass Ejections As a Mechanism for Producing IR Variability in Debris Disks
• ALICE Data Release: A revaluation of HST-NICMOS coronagraphic images
• Spiral Arm Pattern Motion in the SAO 206462 Protoplanetary Disk
• Dust Spreading in Debris Discs: Do Small Grains Cling on to Their Birth Environment?
• Sub-millimeter non-contaminated detection of the disk around TWA\,7 by ALMA
• A kinematically hot population of young stars in the solar neighbourhood

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• Reference-star differential imaging on SPHERE/IRDIS
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• Apocenter pile-up and arcs: a narrow dust ring around HD 129590
• The ALMA survey to Resolve exoKuiper belt Substructures (ARKS): VI. Asymmetries and offsets
• Improving Planet Detection with Disk Modeling: Keck/NIRC2 Imaging of the HD 34282 Single-armed Protoplanetary Disk
• Water ice in the debris disk around HD 181327
• Characterization of debris disks observed with SPHERE
• ALMA's view of the M-dwarf GSC 07396-00759's edge-on debris disc: AU Mic's coeval twin
• The apparent absence of forward scattering in the HD 53143 debris disk
• Nearby Young Stars and Young Moving Groups