SCExAO/CHARIS and Gaia Direct Imaging and Astrometric Discovery of a Superjovian Planet 3--4 lambda/D from the Accelerating Star HIP 54515

Abstract

We present the discovery of a superjovian planet around the young A5 star HIP 54515, detected using precision astrometry from the Hipparcos Gaia Catalogue of Accelerations and high-contrast imaging with SCExAO/CHARIS from the recently-commenced OASIS program. SCExAO/CHARIS detects HIP 54515 b in five epochs 0\farcs{}145--0\farcs{}192 from the star ($\sim$3--4 $\lambda$/D at 1.65 $\mu m$), exhibiting clockwise orbital motion. HIP 54515 b lies near the M/L transition with a luminosity of log(L/L${}_{\odot }$) $\sim$ -3.52 $\pm$ 0.03. Dynamical modeling constrains its mass and mass ratio to be ${17.7}_{-4.9}^{+7.6}$ $M_{\mathrm{Jup}}$ and ${0.0090}_{-0.0024}^{+0.0036}$ and favors a $\sim$25 au semimajor axis. HIP 54515 b adds to a growing list of superjovian planets with moderate eccentricities (e $\approx$ 0.4). Now the third planet discovered from surveys combining high-contrast extreme adaptive optics imaging with precision astrometry, HIP 54515 b should help improve empirical constraints on the luminosity evolution and eccentricity distribution of the most massive planets. It may also provide a key technical test of the Roman Space Telescope Coronagraph Instrument's performance in the low stellar flux, small angular separation limit and a demonstration of its ability to yield constrainable planet spectral properties.

arXiv comment18 pages, 7 figures, 4 tables; AJ in press; 3rd joint direct imaging + astrometric discovery of an extrasolar planet

References in corpus (67)

• emcee: The MCMC Hammer
• Gaia Data Release 3: Summary of the content and survey properties
• Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-Main Sequence Stars
• Angular Differential Imaging: a Powerful High-Contrast Imaging Technique
• Models of Stars, Brown Dwarfs and Exoplanets
• The Theory of Brown Dwarfs and Extrasolar Giant Planets
• BANYAN. XI. The BANYAN $\Sigma$ multivariate Bayesian algorithm to identify members of young associations within 150 pc
• A new algorithm for point spread function subtraction in high-contrast imaging: a demonstration with angular differential imaging
• The Gemini Planet Imager Exoplanet Survey: Giant Planet and Brown Dwarf Demographics From 10-100 AU
• Fundamental limitations of high contrast imaging set by small sample statistics
• On the age of the $\beta$ Pictoris moving group
• The Runts of the Litter: Why planets formed through gravitational instability can only be failed binary stars
• The Deuterium-Burning Mass Limit for Brown Dwarfs and Giant Planets
• A Combined Subaru/VLT/MMT 1--5 Micron Study of Planets Orbiting HR 8799: Implications for Atmospheric Properties, Masses, and Formation
• A catalogue of young runaway Hipparcos stars within 3kpc from the Sun
• Stellar and substellar companions from Gaia EDR3 -- Proper motion anomaly and resolved common proper motion pairs
• Improving Galactic Center Astrometry by Reducing the Effects of Geometric Distortion
• BANYAN. VII. A New Population of Young Substellar Candidate Members of Nearby Moving Groups from the BASS Survey
• Search for brown-dwarf companions of stars
• Population-Level Eccentricity Distributions of Imaged Exoplanets and Brown Dwarf Companions: Dynamical Evidence for Distinct Formation Channels
• Dust depleted inner disks in a large sample of transition disks through long-baseline ALMA observations
• All-Sky spectrally matched UBVRI-ZY and u'g'r'i'z' magnitudes for stars in the Tycho2 catalog
• A self-consistent cloud model for brown dwarfs and young giant exoplanets: comparison with photometric and spectroscopic observations
• Detection and Characterization of Exoplanets using Projections on Karhunen-Loeve Eigenimages: Forward Modeling
• Images of Embedded Jovian Planet Formation At A Wide Separation Around AB Aurigae
• Resolving the HD 100546 Protoplanetary System with the Gemini Planet Imager: Evidence for Multiple Forming, Accreting Planets
• Precise Dynamical Masses of Directly Imaged Companions from Relative Astrometry, Radial Velocities, and Hipparcos-Gaia DR2 Accelerations
• High Orbital Eccentricities of Extrasolar Planets Induced by the Kozai Mechanism
• Direct Imaging Confirmation and Characterization of a Dust-Enshrouded Candidate Exoplanet Orbiting Fomalhaut
• Direct confirmation of the radial-velocity planet $\beta$ Pic c
• orvara: An Efficient Code to Fit Orbits using Radial Velocity, Absolute, and/or Relative Astrometry
• High-contrast imaging of Sirius~A with VLT/SPHERE: Looking for giant planets down to one astronomical unit
• 3-D selection of 167 sub-stellar companions to nearby stars
• The Gemini NICI Planet-Finding Campaign: Discovery of a Multiple System Orbiting the Young A Star HD 1160
• The mass of Beta Pictoris c from Beta Pictoris b orbital motion
• AF Lep b: the lowest mass planet detected coupling astrometric and direct imaging data
• Direct imaging discovery of a super-Jovian around the young Sun-like star AF Leporis
• Direct Imaging and Astrometric Detection of a Gas Giant Planet Orbiting an Accelerating Star
• Improved Dynamical Masses for Six Brown Dwarf Companions Using Hipparcos and Gaia EDR3
• Astrometric Accelerations as Dynamical Beacons: A Giant Planet Imaged Inside the Debris Disk of the Young Star AF Lep
• The Measurement, Treatment, and Impact of Spectral Covariance and Bayesian Priors in Integral-Field Spectroscopy of Exoplanets
• The Ages of A-Stars I: Interferometric Observations and Age Estimates for Stars in the Ursa Major Moving Group
• Direct Imaging Discovery and Dynamical Mass of a Substellar Companion Orbiting an Accelerating Hyades Sun-like Star with SCExAO/CHARIS
• The detection and characterisation of 54 massive companions with the SOPHIE spectrograph -- 7 new brown dwarfs and constraints on the BD desert
• A temperate super-Jupiter imaged with JWST in the mid-infrared
• SCExAO/CHARIS Near-Infrared Direct Imaging, Spectroscopy, and Forward-Modeling of kappa And b: A Likely Young, Low-Gravity Superjovian Companion
• Could the planets around HR 8799 be brown dwarfs?
• The Nancy Grace Roman Space Telescope Coronagraph Instrument (CGI) Technology Demonstration
• SCExAO/CHARIS Direct Imaging Discovery of a 20 au Separation, Low-Mass Ratio Brown Dwarf Companion to an Accelerating Sun-like Star
• Dynamical Masses of Young M Dwarfs: Masses and Orbital Parameters of GJ 3305 AB, the Wide Binary Companion to the Imaged Exoplanet Host 51 Eri
• Artificial incoherent speckles enable precision astrometry and photometry in high-contrast imaging
• The First Dynamical Mass Measurement in the HR 8799 System
• The Age of the Directly-Imaged Planet Host Star $\kappa$ Andromedae Determined From Interferometric Observations
• The Impact of Bayesian Hyperpriors on the Population-Level Eccentricity Distribution of Imaged Planets
• Results from The COPAINS Pilot Survey: four new brown dwarfs and a high companion detection rate for accelerating stars
• The Masses of a Sample of Radial-Velocity Exoplanets with Astrometric Measurements
• Limits on the Mass and Initial Entropy of 51 Eri b from Gaia EDR3 Astrometry
• Low Wind Effect on VLT/SPHERE : impact, mitigation strategy, and results
• Surveying Nearby Brown Dwarfs with HGCA: Direct Imaging Discovery of a Faint, High-Mass Brown Dwarf Orbiting HD 176535 A
• Direct-imaging Discovery of a Substellar Companion Orbiting the Accelerating Variable Star, HIP 39017
• Prospects for Directly Imaging Young Giant Planets at Optical Wavelengths
• Dynamical Mass of the Young Brown Dwarf Companion PZ Tel B
• AO3000 at Subaru: Combining for the first time a NIR WFS using First Light's C-RED ONE and ALPAO's 64x64 DM
• VLTI/GRAVITY Observations and Characterization of the Brown Dwarf Companion HD 72946 B
• A young gas giant and hidden substructures in a protoplanetary disk
• Post-processing CHARIS integral field spectrograph data with PyKLIP
• OASIS Survey Direct Imaging and Astrometric Discovery of HIP 71618 B: A Substellar Companion Suitable for the Roman Coronagraph Technology Demonstration

Cited by in corpus (1)

• OASIS Survey Direct Imaging and Astrometric Discovery of HIP 71618 B: A Substellar Companion Suitable for the Roman Coronagraph Technology Demonstration