The Giant Accreting Protoplanet Survey (GAPlanetS) -- Results from a Six Year Campaign to Image Accreting Protoplanets

Abstract

Accreting protoplanets represent a window into planet formation processes. We report Hα differential imaging results from the deepest and most comprehensive accreting protoplanet survey to date, acquired with the Magellan Adaptive Optics (MagAO) system's VisAO camera. The fourteen transitional disks targeted are ideal candidates for protoplanet discovery due to their wide, heavily depleted central cavities, wealth of non-axisymmetric circumstellar disk features evocative of ongoing planet formation, and ongoing stellar accretion. To address the twin challenges of morphological complexity in the target systems and PSF instability, we develop novel approaches for frame selection and optimization of the Karhounen-Loeve Image Processing algorithm pyKLIP. We detect one new candidate protoplanet, CS Cha "c", at a separation of 75mas and a Delta mag of 5.1 and robustly recover the HD142527 B and HD100453 B low mass stellar companions across multiple epochs. Though we cannot rule out a substantial scattered light contribution to its emission, we also recover LkCa 15 b. Its presence inside of the cleared disk cavity and consistency with a forward-modeled point source suggest that it remains a viable protoplanet candidate. The protoplanet PDS 70 c was marginally recovered under our conservative general methodology. However, through targeted optimization in H-alpha} imagery, we tentatively recover PDS 70 c in three epochs and PDS 70 b in one epoch. Of the many other previously-reported companions and companion candidates around objects in the sample, we do not recover any additional robust candidates. However, lack of recovery at moderate H-alpha contrast does not rule out the presence of protoplanets at these locations, and we report limiting H-alpha contrasts in such cases.

Final version, in press at AJ

References in corpus (78)

• New evolutionary models for pre-main sequence and main sequence low-mass stars down to the hydrogen-burning limit
• The Gemini Planet Imager: First Light
• Basic physical parameters of a selected sample of evolved stars
• The Gemini Planet Imager Exoplanet Survey: Giant Planet and Brown Dwarf Demographics From 10-100 AU
• Two accreting protoplanets around the young star PDS 70
• X-Shooter spectroscopy of young stellar objects in Lupus: Accretion properties of class II and transitional objects
• Fundamental limitations of high contrast imaging set by small sample statistics
• Accretion Rates in Herbig Ae stars
• A Circumplanetary Disk Around PDS70c
• A statistical test for Nested Sampling algorithms
• Three radial gaps in the disk of TW Hydrae imaged with SPHERE
• Mass Estimates of a Giant Planet in a Protoplanetary Disk from the Gap Structures
• Multiple Disk Gaps and Rings Generated by a Single Super-Earth
• Submillimeter emission associated with candidate protoplanets
• Dust depleted inner disks in a large sample of transition disks through long-baseline ALMA observations
• Discovery of a Companion Candidate in the HD169142 Transition Disk and the Possibility of Multiple Planet Formation
• On the gas content of transitional disks: a VLT/X-Shooter study of accretion and winds
• Images of Embedded Jovian Planet Formation At A Wide Separation Around AB Aurigae
• On the formation of multiple concentric rings and gaps in protoplanetary disks
• Constraining the Nature of the PDS 70 Protoplanets with VLTI/GRAVITY
• Characterization of exoplanets from their formation III: The statistics of planetary luminosities
• An Enigmatic Pointlike Feature within the HD 169142 Transitional Disk
• Pre-main sequence spectroscopic binaries suitable for VLTI observations
• Dust unveils the formation of a mini-Neptune planet in a protoplanetary ring
• No Clear, Direct Evidence for Multiple Protoplanets Orbiting LkCa 15: LkCa 15 bcd are Likely Inner Disk Signals
• Five steps in the evolution from protoplanetary to debris disk
• Exploring dust around HD142527 down to 0.025" / 4au using SPHERE/ZIMPOL
• The Orbit and Transit Prospects for $\beta$ Pictoris b constrained with One Milliarcsecond Astrometry
• Imaging the Inner and Outer Gaps of the Pre-Transitional Disk of HD 169142 at 7 mm
• Polarized disk emission from Herbig Ae/Be stars observed using Gemini Planet Imager: HD 144432, HD 150193, HD 163296, and HD 169142
• The Structure of Pre-transitional Protoplanetary Disks. II. Azimuthal Asymmetries, Different Radial Distributions of Large and Small Dust Grains in PDS~70
• VLT/SPHERE exploration of the young multiplanetary system PDS70
• Dust-trapping vortices and a potentially planet-triggered spiral wake in the pre-transitional disk of V1247 Orionis
• Resolving the planet-hosting inner regions of the LkCa 15 disk
• Calibrated griz magnitudes of Tycho stars: All-sky photometric calibration using bright stars
• Investigation of the inner structures around HD169142 with VLT/SPHERE
• Hubble Space Telescope UV and H$\alpha$ Measurements of the Accretion Excess Emission from the Young Giant Planet PDS 70 b
• Annular substructures in the transition disks around LkCa 15 and J1610
• Magellan Adaptive Optics first-light observations of the exoplanet $\beta$ Pic b. I. Direct imaging in the far-red optical with MagAO+VisAO and in the near-IR with NICI
• Millimetre spectral indices of transition disks and their relation to the cavity radius
• Variable dynamics in the inner disk of HD 135344B revealed with multi-epoch scattered light imaging
• Spiral Structure in the Gas Disk of TW Hya
• Spatial segregation of dust grains in transition disks. SPHERE observations of 2MASS J16083070-3828268 and RXJ1852.3-3700
• The widest H$\alpha$ survey of accreting protoplanets around nearby transition disks
• Blobs, spiral arms, and a possible planet around HD 169142
• Orbital Motion in Pre-Main Sequence Binaries
• HD 169142 in the eyes of ZIMPOL/SPHERE
• Multi-epoch Ultraviolet HST Observations of Accreting Low-mass Stars
• A dusty filament and turbulent CO spirals in HD135344B-SAO206462
• Comparison of planetary Hα-emission models: A new correlation with accretion luminosity
• MagAO: Status and on-sky performance of the Magellan adaptive optics system
• SPHERE dynamical and spectroscopic characterization of HD142527B
• Variability of Disk Emission in Pre-Main Sequence and Related Stars. III. Exploring Structural Changes in the Pre-transitional Disk in HD 169142
• HST/WFC3 H$\alpha$ Direct-Imaging Detection of a Point-like Source in the Disk Cavity of AB Aur
• ALMA study of the HD 100453 AB system and the tidal interaction of the companion with the disk
• Variable Accretion onto Protoplanet Host Star PDS 70
• Stellar parameters and accretion rate of the transition disk star HD 142527 from X-Shooter
• Young stars and brown dwarfs surrounding Alnilam (eps Ori) and Mintaka (del Ori)
• Near-infrared Accretion Signatures from the Circumbinary Planetary Mass Companion Delorme 1 (AB)b
• HD142527: Quantitative disk polarimetry with SPHERE
• Scattered Light from Dust in the Cavity of the V4046 Sgr Transition Disk
• Constraining Protoplanetary Disk Accretion and Young Planets Using ALMA Kinematic Observations
• ALMA 870 $\mu$m continuum observations of HD 100546. Evidence of a giant planet on a wide orbit
• Spirals, shadows & precession in HD 100453 -- I. The orbit of the binary
• Non-Keplerian spirals, a gas-pressure dust trap and an eccentric gas cavity in the circumbinary disc around HD 142527
• Searching for H${}_{\alpha }$-emitting sources in the gaps of five transitional disks. SPHERE/ZIMPOL high-contrast imaging
• The Separation and H-alpha Contrasts of Massive Accreting Planets in the Gaps of Transitional Disks: Predicted H-alpha Protoplanet Yields for Adaptive Optics Surveys
• Constrained Reference Star Differential Imaging: Enabling High-Fidelity Imagery of Highly Structured Circumstellar Disks
• Efficiently Imaging Accreting Protoplanets from Space: Reference Star Differential Imaging of the PDS 70 Planetary System using the HST/WFC3 Archival PSF Library
• Unveiling the outer dust disc of TW Hya with deep ALMA observations
• The Giant Accreting Protoplanet Survey (GAPlanetS): Optimization Techniques for Robust Detections of Protoplanets
• MagAO: Status and Science
• A Survey for a Coeval, Comoving Group Associated with HD 141569
• High-resolution ALMA observations of V4046Sgr: a circumbinary disc with a thin ring
• CS Cha B: A disc-obscured M-type star mimicking a polarised planetary companion
• Imaging protoplanets: observing transition disks with non-redundant masking
• Tiny Grains Shining Bright in the Gaps of Herbig Ae Transitional Discs
• Chamaeleon

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