WIde Separation Planets In Time (WISPIT): Two directly imaged exoplanets around the Sun-like stellar binary WISPIT 1

Abstract

Wide separation gas giant planets present a challenge to current planet formation theories, and the detection and characterisation of these systems enables us to constrain their formation pathways. The WIde Separation Planets In Time (WISPIT) survey aims to detect and characterise wide separation planetary-mass companions over a range of ages from <5 to 20 Myr around solar-type host stars at distances of 75-500 (median: 140) parsecs. The WISPIT survey carries out two 5 minute H-band exposures with the VLT/SPHERE instrument and IRDIS camera, separated by at least six months to identify co-moving companions via proper motion analysis. These two H-band observations in combination with a follow-up Ks-band observation were used to determine the colour-magnitude of the co-moving companions and to derive their masses by comparing to AMES-COND and AMES-DUSTY evolutionary tracks. We report the discovery of WISPIT 1b and WISPIT 1c, two gas giant exoplanets that are co-moving with the stellar binary WISPIT 1, which itself consists of a K4 star and M5.5 star in a multi-decadal orbit. The planets are at projected separations of 338 au and 840 au and have masses of 10 Mj and 4 Mj respectively. We identified two common proper motion planetary companions to a (previously unknown) stellar binary with a Sun-like primary. These targets are ideal for follow up characterisation with both ground and space-based telescopes. Monitoring of the orbit with the GRAVITY interferometer will place constraints on their eccentricity, and spectroscopic characterisation will identify the composition and metallicity, providing information on their formation pathways.

Accepted for publication in Astronomy & Astrophysics section "10. Planets, planetary systems, and small bodies" on August 25, 2025

References in corpus (88)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Array Programming with NumPy
• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• Astropy: A Community Python Package for Astronomy
• emcee: The MCMC Hammer
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• On the variation of the Initial Mass Function
• The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
• Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
• Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-Main Sequence Stars
• The SIMBAD astronomical database
• Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
• Direct Imaging of Multiple Planets Orbiting the Star HR 8799
• A Hipparcos census of the nearby OB associations
• Evolutionary models for very-low-mass stars and brown dwarfs with dusty atmospheres
• The Limiting Effects of Dust in Brown Dwarf Model Atmospheres
• The Revised TESS Input Catalog and Candidate Target List
• Images of a fourth planet orbiting HR 8799
• Rapid growth of gas-giant cores by pebble accretion
• Initial Performance of the NEOWISE Reactivation Mission
• The Gemini Planet Imager: First Light
• The GALAH+ Survey: Third Data Release
• VOSA: Virtual Observatory SED Analyzer. An application to the Collinder 69 open cluster
• SPHERE: the exoplanet imager for the Very Large Telescope
• A probable giant planet imaged in the Beta Pictoris disk
• Discovery and spectroscopy of the young Jovian planet 51 Eri b with the Gemini Planet Imager
• Extrasolar planet population synthesis I: Method, formation tracks and mass-distance distribution
• Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Southern Sample
• Gravitational Instabilities in Circumstellar Disks
• Second ROSAT all-sky survey (2RXS) source catalogue
• The Gemini Planet Imager Exoplanet Survey: Giant Planet and Brown Dwarf Demographics From 10-100 AU
• Neglected Clouds in T and Y Dwarf Atmospheres
• The Star-formation History and Accretion-Disk Fraction Among the K-Type Members of the Scorpius-Centaurus OB Association
• Fundamental limitations of high contrast imaging set by small sample statistics
• The GALAH Survey: Second Data Release
• Extrasolar planet population synthesis IV. Correlations with disk metallicity, mass and lifetime
• The SRG/eROSITA all-sky survey: First X-ray catalogues and data release of the western Galactic hemisphere
• PynPoint: An Image Processing Package for Finding Exoplanets
• The Gemini Deep Planet Survey -- GDPS
• 3D maps of the local ISM from inversion of individual color excess measurements
• The Wide Field Spectrograph (WiFeS)
• Direct Imaging and Spectroscopy of a Planetary Mass Candidate Companion to a Young Solar Analog
• The SPHERE infrared survey for exoplanets (SHINE). III. The demographics of young giant exoplanets below 300 au with SPHERE
• Apodized Pupil Lyot Coronagraphs for Arbitrary Telescope Apertures
• Mapping the Shores of the Brown Dwarf Desert I.: Upper Scorpius
• The Formation Mechanism of Gas Giants on Wide Orbits
• Discovery of a warm, dusty giant planet around HIP65426
• Two Wide Planetary-Mass Companions to Solar-Type Stars in Upper Scorpius
• HD 106906 b: A planetary-mass companion outside a massive debris disk
• 3D mapping of young stars in the solar neighbourhood with Gaia DR2
• MIRACLES: atmospheric characterization of directly imaged planets and substellar companions at 4-5 $\mu$m. I. Photometric analysis of $\beta$ Pic b, HIP 65426 b, PZ Tel B and HD 206893 B
• Formation, Survival, and Detectability of Planets Beyond 100 AU
• The VLT/NaCo large program to probe the occurrence of exoplanets and brown dwarfs at wide orbits. IV. Gravitational instability rarely forms wide, giant planets
• Direct confirmation of the radial-velocity planet $\beta$ Pic c
• Clouds in the Coldest Brown Dwarfs: FIRE Spectroscopy of Ross 458C
• A Disk Around the Planetary-Mass Companion GSC 06214-00210 b: Clues About the Formation of Gas Giants on Wide Orbits
• Stars with Photometrically Young Gaia Luminosities Around the Solar System (SPYGLASS) I: Mapping Young Stellar Structures and their Star Formation Histories
• The mass of the young planet Pictoris b through the astrometric motion of its host star
• Towards a population synthesis model of self-gravitating disc fragmentation and tidal downsizing II: The effect of fragment-fragment interactions
• A narrow, edge-on disk resolved around HD 106906 with SPHERE
• The properties of the T8.5p dwarf Ross 458C
• Hip 63510C, Hip 73786B, and nine new isolated high proper motion T dwarf candidates from UKIDSS DR6 and SDSS DR7
• Two Directly Imaged, Wide-orbit Giant Planets around the Young, Solar Analog TYC 8998-760-1
• Astrometric Accelerations as Dynamical Beacons: A Giant Planet Imaged Inside the Debris Disk of the Young Star AF Lep
• PynPoint: a modular pipeline architecture for processing and analysis of high-contrast imaging data
• The Young Suns Exoplanet Survey: Detection of a wide orbit planetary mass companion to a solar-type Sco-Cen member
• Characterization of Low-mass, Wide-separation Substellar Companions to Stars in Upper Scorpius: Near-infrared Photometry and Spectroscopy
• A wide-orbit giant planet in the high-mass b Centauri binary system
• A sextet of clusters in the Vela OB2 region revealed by Gaia
• The Second Discovery from the COol Companions ON Ultrawide orbiTS (COCONUTS) Program: A Cold Wide-Orbit Exoplanet around a Young Field M Dwarf at 10.9 pc
• On the Masses, Age, and Architecture of the VHS J1256-1257AB b System
• Discovery of a directly imaged planet to the young solar analog YSES 2
• On the origin of the wide-orbit circumbinary giant planet HD 106906: A dynamical scenario and its impact on the disk
• The Hawaii Infrared Parallax Program. III. 2MASS J0249-0557 c: A Wide Planetary-mass Companion to a Low-mass Binary in the beta Pic Moving Group
• 15000 Ellipsoidal Binary Candidates in TESS: Orbital Periods, Binary Fraction, and Tertiary Companions
• Cloud Atlas: Rotational Spectral Modulations and potential Sulfide Clouds in the Planetary-mass, Late T-type Companion Ross 458C
• The ESO SupJup Survey III: Confirmation of 13CO in YSES 1 b and Atmospheric Detection of YSES 1 c with CRIRES+
• First detection of orbital motion for HD 106906 b: A wide-separation exoplanet on a Planet Nine-like orbit
• Silicate clouds and a circumplanetary disk in the YSES-1 exoplanet system
• Discovery of a directly imaged disk in scattered light around the Sco-Cen member Wray 15-788
• Gaia EDR3 comparative study of protoplanetary disk fractions in young stellar clusters
• The puzzle of the formation of T8 dwarf Ross 458c
• A spectroscopically confirmed Gaia-selected sample of 318 new young stars within $\sim$200 pc
• Formation History of HD106906 and the Vertical Warping of Debris Disks by an External Inclined Companion
• Giant planets population around B stars from the first part of the BEAST survey
• High-Contrast Coronagraphy
• Exoplanet Atmosphere Measurements from Direct Imaging
• YSES 2b is a background star: Differential astrometric M-dwarf measurements in time

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