Mapping the Skies of Ultracool Worlds: Detecting Storms and Spots with Extremely Large Telescopes

Abstract

Extremely large telescopes (ELTs) present an unparalleled opportunity to study the magnetism, atmospheric dynamics, and chemistry of very low mass stars (VLMs), brown dwarfs, and exoplanets. Instruments such as the Giant Magellan Telescope - Consortium Large Earth Finder (GMT/GCLEF), the Thirty Meter Telescope's Multi-Objective Diffraction-limited High-Resolution Infrared Spectrograph (TMT/MODHIS), and the European Southern Observatory's Mid-Infrared ELT Imager and Spectrograph (ELT/METIS) provide the spectral resolution and signal-to-noise (S/N) necessary to Doppler image ultracool targets' surfaces based on temporal spectral variations due to surface inhomogeneities. Using our publicly-available code, $Imber$, developed and validated in Plummer & Wang (2022), we evaluate these instruments' abilities to discern magnetic star spots and cloud systems on a VLM star (TRAPPIST-1); two L/T transition ultracool dwarfs (VHS J1256$-$1257 b and SIMP J0136+0933); and three exoplanets (Beta Pic b and HR 8799 d and e). We find that TMT/MODHIS and ELT/METIS are suitable for Doppler imaging the ultracool dwarfs and Beta Pic b over a single rotation. Uncertainties for longitude and radius are typically $\lesssim 10^{\circ }$, and latitude uncertainties range from $\sim 10^{\circ }\mathrm{to}30^{\circ }$. TRAPPIST-1's edge-on inclination and low $\upsilon \sin i$ provide a challenge for all three instruments while GMT/GCLEF and the HR 8799 planets may require observations over multiple rotations. We compare the spectroscopic technique, photometry-only inference, and the combination of the two. We find combining spectroscopic and photometric observations can lead to improved Bayesian inference of surface inhomogeneities and offers insight into whether ultracool atmospheres are dominated by spotted or banded features.

arXiv commentAccepted for publication in The Astrophysical Journal, 26 pages, 10 figures, 3 tables

References in corpus (141)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Astropy: A Community Python Package for Astronomy
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• Validation of the new Hipparcos reduction
• dynesty: A Dynamic Nested Sampling Package for Estimating Bayesian Posteriors and Evidences
• Direct Imaging of Multiple Planets Orbiting the Star HR 8799
• Habitable Zones Around Main-Sequence Stars: New Estimates
• Seven temperate terrestrial planets around the nearby ultracool dwarf star TRAPPIST-1
• The Limiting Effects of Dust in Brown Dwarf Model Atmospheres
• Images of a fourth planet orbiting HR 8799
• Models of Stars, Brown Dwarfs and Exoplanets
• A giant planet imaged in the disk of the young star Beta Pictoris
• Precipitating Condensation Clouds in Substellar Atmospheres
• The Evolution of L and T Dwarfs in Color-Magnitude Diagrams
• Temperate Earth-sized planets transiting a nearby ultracool dwarf star
• 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
• Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Southern Sample
• A self-consistent, absolute isochronal age scale for young moving groups in the solar neighbourhood
• Model Atmospheres for M (Sub)Dwarfs: I. The base model grid
• The fast spin-rotation of a young extrasolar planet
• Stellar and substellar companions of nearby stars from Gaia DR2 - Binarity from proper motion anomaly
• A seven-planet resonant chain in TRAPPIST-1
• Least squares deconvolution of the stellar intensity and polarization spectra
• Clouds and Chemistry: Ultracool Dwarf Atmospheric Properties from Optical and Infrared Colors
• Clouds and Chemistry in the Atmosphere of Extrasolar Planet HR8799b
• A Near-Infrared Spectroscopic Study of Young Field Ultracool Dwarfs
• Stellar Flares from the First Tess Data Release: Exploring a New Sample of M-dwarfs
• A stellar-mass-dependent drop in planet occurrence rates
• Dynamic nested sampling: an improved algorithm for parameter estimation and evidence calculation
• Masses, Radii, and Cloud Properties of the HR 8799 Planets
• The Tucana/Horologium, Columba, AB Doradus, and Argus Associations: New Members and Dusty Debris Disks
• Toroidal versus poloidal magnetic fields in Sun-like stars: a rotation threshold
• Parallel Implementation of the PHOENIX Generalized Stellar Atmosphere Program
• Chromospheric Activity, Rotation, and Rotational Braking in M and L Dwarfs
• Photometric Variability of the T2.5 Brown Dwarf SIMP J013656.5+093347; Evidence for Evolving Weather Patterns
• The Debris Disk Around HR 8799
• The Hawaii Infrared Parallax Program. II. Young Ultracool Field Dwarfs
• HST Spectral Mapping of L/T Transition Brown Dwarfs Reveals Cloud Thickness Variations
• A comparison of chemistry and dust cloud formation in ultracool dwarf model atmospheres
• Retrieving scattering clouds and disequilibrium chemistry in the atmosphere of HR 8799e
• A Patchy Cloud Model for the L to T Dwarf Transition
• Gaia Early Data Release 3: Summary of the contents and survey properties
• Near-Infrared Spectroscopy of the Extrasolar Planet HR 8799 b
• Large Amplitude Variations of an L/T Transition Brown Dwarf: Multi-Wavelength Observations of Patchy, High-Contrast Cloud Features
• A global cloud map of the nearest known brown dwarf
• Strong Brightness Variations Signal Cloudy-to-Clear Transition of Brown Dwarfs
• An advanced scattered moonlight model for Cerro Paranal
• A Volume-limited Sample of 63 M7-M9.5 Dwarfs II. Activity, magnetism, and the fade of the rotation-dominated dynamo
• Simultaneous Detection of Water, Methane and Carbon Monoxide in the Atmosphere of Exoplanet HR8799b
• Water Clouds in Y Dwarfs and Exoplanets
• First light of the VLT planet finder SPHERE. III. New spectrophotometry and astrometry of the HR8799 exoplanetary system
• The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems II: A 1 to 20 Micron Spectrum of the Planetary-Mass Companion VHS 1256-1257 b
• Frequent flaring in the TRAPPIST-1 system - unsuited for life?
• Model atmospheres for massive gas giants with thick clouds: Application to the HR 8799 planets and predictions for future detections
• Discovery of a young planetary mass companion to the nearby M dwarf VHS J125601.92-125723.9
• The CARMENES search for exoplanets around M dwarfs -- Planet occurrence rates from a subsample of 71 stars
• First direct detection of an exoplanet by optical interferometry; Astrometry and K-band spectroscopy of HR8799 e
• HELIOS-Retrieval: An Open-source, Nested Sampling Atmospheric Retrieval Code, Application to the HR 8799 Exoplanets and Inferred Constraints for Planet Formation
• First Light LBT AO Images of HR 8799 bcde at 1.65 and 3.3 Microns: New Discrepancies between Young Planets and Old Brown Dwarfs
• First light of the VLT planet finder SPHERE. IV. Physical and chemical properties of the planets around HR8799
• Directly Imaged L-T Transition Exoplanets in the Mid-Infrared
• Strong XUV irradiation of the Earth-sized exoplanets orbiting the ultracool dwarf TRAPPIST-1
• Peering into the formation history of beta Pictoris b with VLTI/GRAVITY long baseline interferometry
• Brown Dwarf Photospheres are Patchy: A Hubble Space Telescope Near-infrared Spectroscopic Survey Finds Frequent Low-level Variability
• Spatially resolved spectroscopy of the exoplanet HR 8799 c
• A Combined VLT and Gemini Study of the Atmosphere of the Directly-Imaged Planet, beta Pictoris b
• Spectral evidence for dust in late-type M dwarfs
• The near-infrared spectral energy distribution of β Pictoris b
• On the Age of the TRAPPIST-1 System
• The Carina-Near Moving Group
• Discovery of the brightest T dwarf in the northern hemisphere
• Modeling the RV jitter of early M dwarfs using tomographic imaging
• The mass of the young planet Pictoris b through the astrometric motion of its host star
• 1 to 2.4 micron Near-IR spectrum of the Giant Planet $\beta$ Pictoris b obtained with the Gemini Planet Imager
• The Viewing Geometry of Brown Dwarfs Influences Their Observed Colours and Variability Properties
• Atmospheric Regimes and Trends on Exoplanets and Brown Dwarfs
• Atmospheric mass loss by stellar wind from planets around main sequence M stars
• $ExtrasolarStorms$: Pressure-dependent Changes In Light Curve Phase In Brown Dwarfs From Simultaneous $Hubble$ and $Spitzer$ Observations
• Thermal Infrared MMTAO Observations of the HR 8799 Planetary System
• Magellan Adaptive Optics first-light observations of the exoplanet beta Pic b. II. 3-5 micron direct imaging with MagAO+Clio, and the empirical bolometric luminosity of a self-luminous giant planet
• UV Surface Habitability of the TRAPPIST-1 System
• The Onset of Methane in L Dwarfs
• Discovery of Rotational Modulations in the Planetary-Mass Companion 2M1207b: Intermediate Rotation Period and Heterogeneous Clouds in a Low Gravity Atmosphere
• Atmospheric Circulation of Brown Dwarfs: Jets, Vortices, and Time Variability
• Atmospheric Circulation of Brown Dwarfs and Jupiter and Saturn-like Planets: Zonal Jets, Long-term Variability, and QBO-type Oscillations
• An independent analysis of the brown dwarf atmosphere monitoring (BAM) data: large-amplitude variability is rare outside the L/T transition
• Detection and Bulk Properties of the HR 8799 Planets with High Resolution Spectroscopy
• K2 Ultracool Dwarfs Survey. III. White Light Flares are Ubiquitous in M6-L0 Dwarfs
• Starspot distributions on fully convective M dwarfs: implications for radial velocity planet searches
• Variability in a Young, L/T Transition Planetary-Mass Object
• Simultaneous, Multi-Wavelength Variability Characterization of the Free-Floating Planetary Mass Object PSO J318.5-22
• SIMP J013656.5+093347 is Likely a Planetary-Mass Object in the Carina-Near Moving Group
• Cloud structure of the nearest brown dwarfs: Spectroscopic variability of Luhman 16AB from the Hubble Space Telescope
• Deep Thermal Infrared Imaging of HR 8799 bcde: New Atmospheric Constraints and Limits on a Fifth Planet
• A Model-Independent Mass and Moderate Eccentricity for $\beta$ Pic b
• Patchy Forsterite Clouds in the Atmospheres of Two Highly Variable Exoplanet Analogs
• The Mega-MUSCLES Spectral Energy Distribution Of TRAPPIST-1
• GPI spectra of HR 8799 c, d, and e from 1.5 to 2.4$\mu$m with KLIP Forward Modeling
• Constrains on planets around beta Pic with Harps radial velocity data
• Spectral Variability of VHS J1256-1257 b from 1 to 5 $\mu$m
• Deep exploration of the planets HR 8799 b, c, and d with moderate resolution spectroscopy
• The Effects of Fe II NLTE on Nova Atmospheres and Spectra
• Weather on Other Worlds I: Detection of Periodic Variability in the L3 Dwarf DENIS-P J1058.7-1548 with Precise Multi-Wavelength Photometry
• Physical and orbital properties of Beta Pictoris b
• Possible Bright Starspots on TRAPPIST-1
• The Stellar Activity of TRAPPIST-1 and Consequences for the Planetary Atmospheres
• Surprisingly different starspot distributions on the near equal-mass equal-rotation-rate stars in the M dwarf binary GJ 65 AB
• Strong Near-Infrared Spectral Variability of the Young Cloudy L Dwarf Companion VHS J1256-1257 b
• Analysis of Keck High Resolution Spectra of VB10
• As the Worlds Turn: Constraining Spin Evolution in the Planetary-Mass Regime
• TESS Observations of the Luhman 16AB Brown Dwarf System: Rotational Periods, Lightcurve Evolution, and Zonal Circulation
• Preliminary Spectral Analysis of SN 1994I
• Maps of Evolving Cloud Structures in Luhman 16AB from HST Time-Resolved Spectroscopy
• Cloud Structure of the Nearest Brown Dwarfs II: High-amplitude variability for Luhman 16 A and B in and out of the 0.99 micron FeH feature
• On the Masses, Age, and Architecture of the VHS J1256-1257AB b System
• Retrieving the C and O Abundances of HR 7672~AB: a Solar-Type Primary Star with a Benchmark Brown Dwarf
• On the Chemical Abundance of HR 8799 and the Planet c
• Giant white-light flares on fully convective stars occur at high latitudes
• Roaring Storms in the Planetary-Mass Companion VHS 1256-1257 b: Hubble Space Telescope Multi-epoch Monitoring Reveals Vigorous Evolution in an Ultra-cool Atmosphere
• Rotational Modulation of M/L Dwarfs due to Magnetic Spots
• X-SHYNE: X-shooter spectra of young exoplanet analogs. I. A medium-resolution 0.65-2.5$\mu \mathrm{m}$ one-shot spectrum of VHS\,1256-1257 b
• An exact, generalised Laplace resonance in the HR 8799 planetary system
• A Reanalysis of the Fundamental Parameters and Age of TRAPPIST-1
• Detection of new strongly variable brown dwarfs in the L/T transition
• Non-LTE Treatment of Fe II in Astrophysical Plasmas
• Atmospheric Monitoring and Precise Spectroscopy of the HR 8799 Planets with SCExAO/CHARIS
• $K2$ Ultracool Dwarfs Survey. VI. White light superflares observed on an L5 dwarf and flare rates of L dwarfs
• METIS: The Mid-infrared ELT Imager and Spectrograph
• Kepler Monitoring of an L Dwarf II. Clouds with Multiyear Lifetimes
• Cloud Atlas: High-precision HST/WFC3/IR Time-Resolved Observations of Directly-Imaged Exoplanet HD106906b
• Moderate-Resolution $K$-Band Spectroscopy of the Substellar Companion VHS 1256 b
• KELT-9 as an eclipsing double-lined spectroscopic binary: a unique and self-consistent solution to the system
• Scaling K2. III. Comparable Planet Occurrence in the FGK Samples of Campaign 5 and Kepler
• Measuring the Obliquities of the TRAPPIST-1 Planets with MAROON-X
• EPIC 203868608: A low-mass quadruple star system in the Upper Scorpius OB association
• Dynamical Mass Estimates of the $\beta$ Pictoris Planetary System Through Gaussian Process Stellar Activity Modelling
• A Unified Spectroscopic and Photometric Model to Infer Surface Inhomogeneity: Application to Luhman 16B
• Time-Resolved High Spectral Resolution Observation of 2MASSW J0746425+200032AB
• Optical Variability, Rotation Period and Inclination Angle of the M9.5 dwarf BRI 0021-0214

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