The First Habitable Zone Earth-sized Planet from TESS. III: Climate States and Characterization Prospects for TOI-700 d

Abstract

We present self-consistent three-dimensional climate simulations of possible habitable states for the newly discovered Habitable Zone Earth-sized planet, TOI-700 d. We explore a variety of atmospheric compositions, pressures, and rotation states for both ocean-covered and completely desiccated planets in order to assess the planet's potential for habitability. For all 20 of our simulated cases, we use our climate model outputs to synthesize transmission spectra, combined-light spectra, and integrated broadband phase curves. These climatologically-informed observables will help the community assess the technological capabilities necessary for future characterization of this planet - as well as similar transiting planets discovered in the future - and will provide a guide for distinguishing possible climate states if one day we do obtain sensitive spectral observations of a habitable planet around a M-star. We find that TOI-700 d is a strong candidate for a habitable world and can potentially maintain temperate surface conditions under a wide variety of atmospheric compositions. Unfortunately, the spectral feature depths from the resulting transmission spectra and the peak flux and variations from our synthesized phase curves for TOI-700 d do not exceed 10 ppm. This will likely prohibit the James Webb Space Telescope (JWST) from characterizing its atmosphere; however, this motivates the community to invest in future instrumentation that perhaps can one day reveal the true nature of TOI-700 d, and to continue to search for similar planets around less distant stars.

arXiv commentAccepted to the Astronomical Journal. 21 pages, 11 figures

References in corpus (93)

• The Transiting Exoplanet Survey Satellite
• Habitable Zones Around Main-Sequence Stars: New Estimates
• Seven temperate terrestrial planets around the nearby ultracool dwarf star TRAPPIST-1
• New evolutionary models for pre-main sequence and main sequence low-mass stars down to the hydrogen-burning limit
• A terrestrial planet candidate in a temperate orbit around Proxima Centauri
• Clouds in the atmosphere of the super-Earth exoplanet GJ 1214b
• Evolution of the Solar Activity over Time and Effects on Planetary Atmospheres: I. High-energy Irradiances (1-1700 A)
• Most 1.6 Earth-Radius Planets are not Rocky
• The evaporation valley in the Kepler planets
• Understanding the Mass-Radius Relation for Sub-Neptunes: Radius as a Proxy for Composition
• Temperate Earth-sized planets transiting a nearby ultracool dwarf star
• Probabilistic Forecasting of the Masses and Radii of Other Worlds
• Extreme Water Loss and Abiotic O${}_2$ Buildup On Planets Throughout the Habitable Zones of M Dwarfs
• Habitable planets around the star Gl 581?
• Biosignatures from Earth-Like Planets Around M Dwarfs
• Roche lobe effects on the atmospheric loss of "Hot Jupiters"
• Planetary evaporation by UV & X-ray radiation: basic hydrodynamics
• Stabilizing Cloud Feedback Dramatically Expands the Habitable Zone of Tidally Locked Planets
• The Transit Light Source Effect: False Spectral Features and Incorrect Densities for M-dwarf Transiting Planets
• Characterizing transiting exoplanet atmospheres with JWST
• The Climate of Early Mars
• Global modelling of the early Martian climate under a denser CO2 atmosphere: Water cycle and ice evolution
• 3D modelling of the early Martian Climate under a denser CO2 atmosphere: Temperatures and CO2 ice clouds
• Planetary Spectrum Generator: an accurate online radiative transfer suite for atmospheres, comets, small bodies and exoplanets
• The Pale Orange Dot: The Spectrum and Habitability of Hazy Archean Earth
• Was Venus the First Habitable World of our Solar System?
• Stellar Activity Masquerading as Planets in the Habitable Zone of the M dwarf Gliese 581
• The habitability of Proxima Centauri b II. Possible climates and Observability
• Strong Dependence of the Inner Edge of the Habitable Zone on Planetary Rotation Rate
• Water loss from Earth-sized planets in the habitable zones of ultracool dwarfs: Implications for the planets of TRAPPIST-1
• Absence of a thick atmosphere on the terrestrial exoplanet LHS 3844b
• The inner edge of the habitable zone for synchronously rotating planets around low-mass stars using general circulation models
• Gliese 581d is the first discovered terrestrial-mass exoplanet in the habitable zone
• The Detectability and Characterization of the TRAPPIST-1 Exoplanet Atmospheres with JWST
• Abiotic oxygen-dominated atmospheres on terrestrial habitable zone planets
• Tidal Locking of Habitable Exoplanets
• Assessing the Habitability of the TRAPPIST-1 System Using a 3D Climate Model
• Habitable Moist Atmospheres On Terrestrial Planets Near the Inner Edge Of the Habitable Zone Around M-dwarfs
• Modelling climate diversity, tidal dynamics and the fate of volatiles on TRAPPIST-1 planets
• The Effect of Host Star Spectral Energy Distribution and Ice-Albedo Feedback on the Climate of Extrasolar Planets
• Water loss from terrestrial planets with CO2-rich atmospheres
• Evolved Climates and Observational Discriminants for the TRAPPIST-1 Planetary System
• Exploring the faint young Sun problem and the possible climates of the Archean Earth with a 3-D GCM
• K-H_2 Quasi-molecular absorption detected in the T-dwarf epsilon Indi Ba
• Pale Orange Dots: The Impact of Organic Haze on the Habitability and Detectability of Earthlike Exoplanets
• Exploring the climate of Proxima B with the Met Office Unified Model
• Impact of Clouds and Hazes on the Simulated JWST Transmission Spectra of Habitable Zone Planets in the TRAPPIST-1 System
• The Mid-Infrared Instrument for the James Webb Space Telescope, III: MIRIM, The MIRI Imager
• Resolving Orbital and Climate Keys of Earth and Extraterrestrial Environments with Dynamics 1.0: A General Circulation Model for Simulating the Climates of Rocky Planets
• Demarcating circulation regimes of synchronously rotating terrestrial planets within the habitable zone
• Habitable Climate Scenarios for Proxima Centauri b With a Dynamic Ocean
• The Near-Infrared Transmission Spectra of TRAPPIST-1 Planets b, c, d, e, f, and g and Stellar Contamination in Multi-Epoch Transit Spectra
• Thermal phase curves of nontransiting terrestrial exoplanets 1. Characterizing atmospheres
• Habitability of Terrestrial-Mass Planets in the HZ of M Dwarfs. I. H/He-Dominated Atmospheres
• Probing the Blow-Off Criteria of Hydrogen-Rich "Super-Earths"
• XUV exposed non-hydrostatic hydrogen-rich upper atmospheres of terrestrial planets. Part I: Atmospheric expansion and thermal escape
• On the Frequency of Potential Venus Analogs from Kepler Data
• The First Habitable Zone Earth-sized Planet from TESS. I: Validation of the TOI-700 System
• Suppression of the water ice and snow albedo feedback on planets orbiting red dwarf stars and the subsequent widening of the habitable zone
• The habitability of super-Earths in Gliese 581
• The Upper Atmospheres of Terrestrial Planets: Carbon Dioxide Cooling and the Earth's Thermospheric Evolution
• Connecting the dots II: Phase changes in the climate dynamics of tidally locked terrestrial exoplanets
• Detecting and Constraining N${}_2$ Abundances in Planetary Atmospheres Using Collisional Pairs
• Deciphering thermal phase curves of dry, tidally locked terrestrial planets
• The atmospheric circulation and climate of terrestrial planets orbiting Sun-like and M-dwarf stars over a broad range of planetary parameters
• Stellar parameters for TRAPPIST-1
• Water Cycling Between Ocean and Mantle: Super-Earths Need Not be Waterworlds
• Identifying Candidate Atmospheres on Rocky M dwarf Planets via Eclipse Photometry
• TRAPPIST-1 Habitable Atmosphere Intercomparison (THAI). Motivations and protocol version 1.0
• No snowball on habitable tidally locked planets
• NIR-Driven Moist Upper Atmospheres of Synchronously Rotating Temperate Terrestrial Exoplanets
• Differences in water vapor radiative transfer among 1D models can significantly affect the inner edge of the habitable zone
• Ocean Dynamics and the Inner Edge of the Habitable Zone for Tidally Locked Terrestrial Planets
• Habitability and Spectroscopic Observability of Warm M-dwarf Exoplanets Evaluated with a 3D Chemistry-Climate Model
• Clouds will likely prevent the detection of water vapor in JWST transmission spectra of terrestrial exoplanets
• How terrestrial planets traverse spin-orbit resonances: A camel goes through a needle's eye
• The persistence of oceans on Earth-like planets: insights from the deep-water cycle
• Simulations of Water Vapor and Clouds on Rapidly Rotating and Tidally Locked Planets: a 3D Model Intercomparison
• Dim Prospects for Transmission Spectra of Ocean Earths Around M Stars
• The 0.8-4.5$\mu$m broadband transmission spectra of TRAPPIST-1 planets
• The First Habitable Zone Earth-Sized Planet From TESS II: $Spitzer$ Confirms TOI-700 d
• N2-associated surface warming on early Mars
• Thermal phase curves of non-transiting terrestrial exoplanets 2. Characterizing airless planets
• No Snowball on Habitable Tidally Locked Planets with a Dynamic Ocean
• Simulated Phase-dependent Spectra of Terrestrial Aquaplanets in M Dwarf Systems
• The dependence of the ice-albedo feedback on atmospheric properties
• Effect of surface-mantle water exchange parameterizations on exoplanet ocean depths
• Wetter Stratospheres on High Obliquity Planets
• Stellar Activity Effects on Moist Habitable Terrestrial Atmospheres Around M dwarfs
• Rapid Water Loss can Extend the Lifetime of the Planetary Habitability
• Multi-messenger Extended Emission from the compact remnant in GW170817
• Scaling Relations for Terrestrial Exoplanet Atmospheres from Baroclinic Criticality
• Aquaplanet Models on Eccentric Orbits: Effects of Rotation Rate on Observables

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• The TESS Objects of Interest Catalog from the TESS Prime Mission
• The First Habitable Zone Earth-sized Planet from TESS. I: Validation of the TOI-700 System
• The TRAPPIST-1 Habitable Atmosphere Intercomparison (THAI). Part III: Simulated Observables -- The return of the spectrum
• Formation and dynamics of water clouds on temperate sub-Neptunes: The example of K2-18b
• Nitrogen Dioxide Pollution as a Signature of Extraterrestrial Technology
• The First Habitable Zone Earth-Sized Planet From TESS II: $Spitzer$ Confirms TOI-700 d
• The CARMENES search for exoplanets around M dwarfs, Wolf 1069 b: Earth-mass planet in the habitable zone of a nearby, very low-mass star
• Detectability of Chlorofluorocarbons in the Atmospheres of Habitable M-dwarf Planets
• ExoPlaSim: Extending the Planet Simulator for Exoplanets
• Alternative Methylated Biosignatures I: Methyl Bromide, A Capstone Biosignature
• Detecting Biosignatures in the Atmospheres of Gas Dwarf Planets with the James Webb Space Telescope
• The Atmospheres of Rocky Exoplanets II. Influence of surface composition on the diversity of cloud condensates
• Habitable Zone and Atmosphere Retention Distance (HaZARD) Stellar-evolution-dependent loss models of secondary atmospheres
• From Global Climate Models (GCMs) to Exoplanet Spectra with the Global Emission Spectra (GlobES)
• Snowball Bistability Vanishes at Moderate Orbital Eccentricity
• The climates and thermal emission spectra of prime nearby temperate rocky exoplanet targets
• New models of reflection spectra for terrestrial exoplanets: Present and prebiotic Earth orbiting around stars of different spectral types
• Evaluating Habitability and Biosignature Detection on TOI-700 d: The Role of UV Environment and Atmospheric Pressure
• Chemistry, Climate, and Transmission Spectra of TRAPPIST-1 e Explored with a Multimodel Sparse Sampled Ensemble