Zodiacal Exoplanets in Time (ZEIT) XII: A Directly-Imaged Planetary-Mass Companion to a Young Taurus M Dwarf Star

Abstract

We report the discovery of a resolved (0".9) substellar companion to a member of the 1-5 Myr Taurus star-forming region. The host star (2M0437) is a single mid-M type ($T_{eff}\approx$3100K) dwarf with a position, space motion, and color-magnitude that support Taurus membership, and possible affiliation with a $\sim$2.5 Myr-old sub-group. A comparison with stellar models suggests a 2-5 Myr age and a mass of 0.15-0.18M${}_{\odot }$. Although K2 detected quasi-periodic dimming from close-in circumstellar dust, the star lacks detectable excess infrared emission from a circumstellar disk and its H$\alpha$ emission is not commensurate with accretion. Astrometry based on three years of AO imaging shows that the companion (2M0437b) is co-moving, while photometry of two other sources at larger separation indicates they are likely heavily-reddened background stars. A comparison of the luminosity of 2M0437b with models suggests a mass of 3-5$M_{\mathrm{jup}}$, well below the deuterium burning limit, and an effective temperature of 1400-1500K, characteristic of a late L spectral type. The $H$-$K$ color is redder than the typical L dwarf, but comparable to other directly detected young planets, e.g. those around HR 8799. The discovery of a super-Jupiter around a very young, very low mass star challenges models of planet formation by either core accretion (which requires time) or disk instability (which requires mass). We also detected a second, co-moving, widely-separated (75") object which appears to be a heavily-extincted star. This is certainly a fellow member of this Taurus sub-group and statistically likely to be a bound companion.

arXiv commentAccepted to MNRAS 14 October 2021

References in corpus (116)

• Astropy: A Community Python Package for Astronomy
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
• Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-Main Sequence Stars
• Gaia Data Release 2: The astrometric solution
• A new extensive library of PHOENIX stellar atmospheres and synthetic spectra
• Direct Imaging of Multiple Planets Orbiting the Star HR 8799
• The Dartmouth Stellar Evolution Database
• New evolutionary models for pre-main sequence and main sequence low-mass stars down to the hydrogen-burning limit
• A Non-Gray Theory of Extrasolar Giant Planets and Brown Dwarfs
• Evolutionary models for very-low-mass stars and brown dwarfs with dusty atmospheres
• A Method of Correcting Near-Infrared Spectra for Telluric Absorption
• Images of a fourth planet orbiting HR 8799
• The UKIRT Infrared Deep Sky Survey ZYJHK Photometric System: Passbands and Synthetic Colours
• The Infrared Telescope Facility (IRTF) Spectral Library: Cool Stars
• How to Constrain Your M Dwarf: measuring effective temperature, bolometric luminosity, mass, and radius
• Discovery of a planetary-mass companion within the gap of the transition disk around PDS 70
• Evolutionary models for low-mass stars and brown dwarfs: uncertainties and limits at very young ages
• An Infrared Spectroscopic Sequence of M, L and T Dwarfs
• A Technique for Extracting Highly Precise Photometry for the Two-Wheeled Kepler Mission
• VOSA: Virtual Observatory SED Analyzer. An application to the Collinder 69 open cluster
• Very Low Mass Stars and Brown Dwarfs in Taurus-Auriga
• Discovery and spectroscopy of the young Jovian planet 51 Eri b with the Gemini Planet Imager
• 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
• Galactic Reddening in 3D from Stellar Photometry - An Improved Map
• A Steeper than Linear Disk Mass-Stellar Mass Scaling Relation
• An Optical Spectroscopic Study of T Tauri Stars. I. Photospheric Properties
• The Disk Population of the Taurus Star-Forming Region
• Stellar and substellar companions of nearby stars from Gaia DR2 - Binarity from proper motion anomaly
• Unresolved stellar companions with Gaia DR2 astrometry
• Spectral and Photometric Diagnostics of Giant Planet Formation Scenarios
• Empirical extinction coefficients for the GALEX, SDSS, 2MASS and WISE passbands
• Fundamental Parameters and Spectral Energy Distributions of Young and Field Age Objects with Masses Spanning the Stellar to Planetary Regime
• Magnetic Inhibition of Convection and the Fundamental Properties of Low-Mass Stars. III. A Consistent 10 Myr Age for the Upper Scorpius OB Association
• The 2MASS Wide-Field T Dwarf Search. III. Seven New T Dwarfs and Other Cool Dwarf Discoveries
• Debris Disks: Structure, Composition, and Variability
• The K2 Ecliptic Plane Input Catalog (EPIC) and Stellar Classifications of 138,600 Targets in Campaigns 1-8
• A Combined Subaru/VLT/MMT 1--5 Micron Study of Planets Orbiting HR 8799: Implications for Atmospheric Properties, Masses, and Formation
• On the use of Gaia magnitudes and new tables of bolometric corrections
• The Taurus Spitzer Survey: New Candidate Taurus Members Selected Using Sensitive Mid-Infrared Photometry
• Trumpeting M Dwarfs with CONCH-SHELL: a Catalog of Nearby Cool Host-Stars for Habitable ExopLanets and Life
• Protoplanetary disk lifetimes vs stellar mass and possible implications for giant planet populations
• Masses, Radii, and Cloud Properties of the HR 8799 Planets
• Parallax Systematics and Photocenter Motions of Benchmark Eclipsing Binaries in Gaia EDR3
• The Tucana/Horologium, Columba, AB Doradus, and Argus Associations: New Members and Dusty Debris Disks
• Direct Imaging of a Cold Jovian Exoplanet in Orbit around the Sun-like Star GJ 504
• The Impact of Stellar Multiplicity on Planetary Systems, I.: The Ruinous Influence of Close Binary Companions
• Synthetic Spectra and Colors of Young Giant Planet Atmospheres: Effects of Initial Conditions and Atmospheric Metallicity
• EVEREST: Pixel Level Decorrelation of K2 Light curves
• The Effective Temperature Scale of M dwarfs
• Discovery of a probable 4-5 Jupiter-mass exoplanet to HD 95086 by direct-imaging
• A Resolved Census of Millimeter Emission from Taurus Multiple Star Systems
• Discovery of a warm, dusty giant planet around HIP65426
• Population-Level Eccentricity Distributions of Imaged Exoplanets and Brown Dwarf Companions: Dynamical Evidence for Distinct Formation Channels
• Improved Modeling of the Rossiter-McLaughlin Effect for Transiting Exoplanets
• The Planetary Mass Companion 2MASS1207-3932 B: Temperature, Mass and Evidence for an Edge-On Disk
• A library of near-infrared integral field spectra of young M-L dwarfs
• Constraining the initial entropy of directly-detected exoplanets
• The VISTA ZYJHKs Photometric System: Calibration from 2MASS
• First light of the VLT planet finder SPHERE. IV. Physical and chemical properties of the planets around HR8799
• Three Wide Planetary-Mass Companions to FW Tau, ROXs 12, and ROXs 42B
• The Stellar Membership of the Taurus Star-forming Region
• A Young Brown Dwarf Companion to DH Tauri
• New insights into the nature of transition disks from a complete disk survey of the Lupus star forming region
• Direct Imaging and Spectroscopy of a Candidate Companion Below/Near the Deuterium-Burning Limit In The Young Binary Star System, ROXs 42B
• The SPOTS Models: A Grid of Theoretical Stellar Evolution Tracks and Isochrones For Testing The Effects of Starspots on Structure and Colors
• The many-faceted light curves of young disk-bearing stars in Upper Sco and $\rho$ Oph observed by $K2$ Campaign 2
• No Clear, Direct Evidence for Multiple Protoplanets Orbiting LkCa 15: LkCa 15 bcd are Likely Inner Disk Signals
• Direct evidence of a sub-stellar companion around CT Cha
• Spatial Distributions of Young Stars
• Evidence Against an Edge-On Disk Around the Extrasolar Planet 2MASS 1207 b and a New Thick Cloud Explanation for its Under-Luminosity
• A Disk-Wind Model for the Near-Infrared Excess Emission in Protostars
• Gaia EDR3 Reveals the Substructure and Complicated Star Formation History of the Greater Taurus-Auriga Star Forming Complex
• The Greater Taurus-Auriga Ecosystem I: There Is A Distributed Older Population
• Discovery of a Wide Binary Brown Dwarf Born in Isolation
• A Probabilistic Approach to Kepler Completeness and Reliability for Exoplanet Occurrence Rates
• Rotation of Low-Mass Stars in Taurus with K2
• A Widely-Separated, Highly-Occluded Companion to the Nearby Low-Mass T Tauri Star TWA 30
• The GJ 504 system revisited. Combining interferometric, radial velocity, and high contrast imaging data
• Two Directly Imaged, Wide-orbit Giant Planets around the Young, Solar Analog TYC 8998-760-1
• Limits on the Spin-Orbit Angle and Atmospheric Escape for the 22 Myr-old Planet AU Mic b
• Orbiting Clouds of Material at the Keplerian Co-Rotation Radius of Rapidly Rotating Low Mass WTTs in Upper Sco
• Chemical composition of the Taurus-Auriga association
• A survey of the linear polarization of directly imaged exoplanets and brown dwarf companions with SPHERE-IRDIS. First polarimetric detections revealing disks around DH Tau B and GSC 6214-210 B
• Warping a protoplanetary disc with a planet on an inclined orbit
• Connecting planet formation and astrochemistry: Refractory carbon depletion leading to super-stellar C/O in giant planetary atmospheres
• Precision radial velocity measurements by the forward-modeling technique in the near-infrared
• Characterizing Undetected Stellar Companions with Combined Datasets
• A 3D view of the Taurus star-forming region by Gaia and Herschel: multiple populations related to the filamentary molecular cloud
• Multiplicity and clustering in Taurus star forming region. II. From ultra-wide pairs to dense NESTs
• Shock-driven Accretion in Circumplanetary Disks: Observables and Satellite Formation
• Spectral and orbital characterisation of the directly imaged giant planet HIP 65426 b
• A Relationship Between Stellar Age and Spot Coverage
• Dipper disks not inclined towards edge-on orbits
• A Survey For Planetary-mass Brown Dwarfs in the Taurus and Perseus Star-forming Regions
• Planets Around Low-Mass Stars (PALMS). VI. Discovery of a Remarkably Red Planetary-Mass Companion to the AB Dor Moving Group Candidate 2MASS J22362452+4751425
• Demographics of disks around young very low-mass stars and brown dwarfs in Lupus
• Excess C/H in Protoplanetary Disk Gas from Icy Pebble Drift across the CO Snowline
• Searching for Scatterers: High-Contrast Imaging of Young Stars Hosting Wide-Separation Planetary-Mass Companions
• The composition of hot Jupiter atmospheres assembled within chemically evolved protoplanetary discs
• The nearby population of M dwarfs with WISE: A search for warm circumstellar dust
• Discovery of a directly imaged planet to the young solar analog YSES 2
• The K2-ESPRINT Project III: A Close-in Super-Earth around a Metal-rich Mid-M Dwarf
• The Near-Ultraviolet Luminosity Function of Young, Early M-Type Dwarf Stars
• The Effect of Binarity on Circumstellar Disk Evolution
• New Extinction and Mass Estimates from Optical Photometry of the Very Low Mass Brown Dwarf Companion CT Chamaeleontis B with the Magellan AO System
• The Age of the Carina Young Association and Potential Membership of HD 95086
• The search for disks or planetary objects around directly imaged companions: A candidate around DH Tau B
• ALMA 0.88 mm Survey of Disks around Planetary-mass Companions
• The ASAS-SN Catalog of Variable Stars VIII: "Dipper" Stars in the Lupus Star-Forming Region
• The old moving groups in the field of Taurus
• A faint companion around CrA-9: protoplanet or obscured binary?
• CS Cha B: A disc-obscured M-type star mimicking a polarised planetary companion
• Formation of Giant Planets

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• Rotation Periods, Inclinations, and Obliquities of Cool Stars Hosting Directly Imaged Substellar Companions: Spin-Orbit Misalignments are Common
• A Census of the Taurus Star-forming Region and Neighboring Associations with Gaia
• Mid-to-Late M Dwarfs Lack Jupiter Analogs
• Very-wide-orbit planets from dynamical instabilities during the stellar birth cluster phase
• On the survivability of a population of gas giant planets on wide orbits
• Searching for substellar companion candidates with Gaia. II. A catalog of 9,698 planet candidate solar-type hosts
• Climate Change in Hell: Long-Term Variation in Transits of the Evaporating Planet K2-22b