The First Habitable-zone Earth-sized Planet from TESS. II. Spitzer Confirms TOI-700 d

2020/01/31 by Joseph E. Rodriguez, Andrew Vanderburg, Sebastian Zieba +43 · 43 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics and Star Formation Studies #Atmosphere (unit) #Exoplanet #Planet #Planetary habitability #Planetary system #RADIUS #Radial velocity #Satellite #Spitzer Space Telescope #Stellar, planetary, and galactic studies #Transit (satellite) #astro-ph.EP #astro-ph.IM #astro-ph.SR

paper · pdf · doi:10.3847/1538-3881/aba4b3

published in The Astronomical Journal 160(3), 117 (Institute of Physics) · 14 Pages, 5 Figures, 2 Tables, Accepted to AJ

openalex created_date 2020/01/10 · arxiv created 2020/06/11 · openalex publication_date 2020/08/14 · arxiv updated 2020/08/26 · openalex updated_date 2026/08/05

Abstract

Abstract We present Spitzer 4.5 μ m observations of the transit of TOI-700 d, a habitable-zone Earth-sized planet in a multiplanet system transiting a nearby M-dwarf star (TIC 150428135, 2MASS J06282325–6534456). TOI-700 d has a radius of and orbits within its host star’s conservative habitable zone with a period of 37.42 days ( T eq ∼ 269 K). TOI-700 also hosts two small inner planets ( R b = and R c = ) with periods of 9.98 and 16.05 days, respectively. Our Spitzer observations confirm the Transiting Exoplanet Survey Satellite (TESS) detection of TOI-700 d and remove any remaining doubt that it is a genuine planet. We analyze the Spitzer light curve combined with the 11 sectors of TESS observations and a transit of TOI-700 c from the LCOGT network to determine the full system parameters. Although studying the atmosphere of TOI-700 d is not likely feasible with upcoming facilities, it may be possible to measure the mass of TOI-700 d using state-of-the-art radial velocity (RV) instruments (expected RV semiamplitude of ∼70 cm s −1 ).

Citations

• batman: BAsic Transit Model cAlculatioN in Python
• A Technique for Extracting Highly Precise Photometry for the Two-WheeledKeplerMission
• Kepler-62: A Five-Planet System with Planets of 1.4 and 1.6 Earth Radii in the Habitable Zone
• Habitable Zones around Main Sequence Stars
• The Transit Light Curve Project. IX. Evidence for a Smaller Radius of the Exoplanet XO‐3b
• Habitable Zones Around Main-Sequence Stars: Dependence on Planetary Mass
• Validation of Twelve Small Kepler Transiting Planets in the Habitable Zone
• STABILIZING CLOUD FEEDBACK DRAMATICALLY EXPANDS THE HABITABLE ZONE OF TIDALLY LOCKED PLANETS
• The Infrared Array Camera (IRAC) for the Spitzer Space Telescope
• THE MASS OF Kepler-93b AND THE COMPOSITION OF TERRESTRIAL PLANETS
• Detection of Thermal Emission from an Extrasolar Planet
• The effect of red noise on planetary transit detection
• AstroImageJ: Image Processing and Photometric Extraction for Ultra-Precise Astronomical Light Curves (Expanded Edition)
• Probabilistic Forecasting of the Masses and Radii of Other Worlds
• FALSE POSITIVE PROBABILITIES FOR ALL KEPLER OBJECTS OF INTEREST: 1284 NEWLY VALIDATED PLANETS AND 428 LIKELY FALSE POSITIVES
• Seven temperate terrestrial planets around the nearby ultracool dwarf star TRAPPIST-1
• Gaia Data Release 2
• Estudos moleculares em pacientes com fibrose cística do sul do Brasil
• The First Habitable-zone Earth-sized Planet from TESS. III. Climate States and Characterization Prospects for TOI-700 d
• A Habitable-Zone Earth-Sized Planet Rescued from False Positive Status
• The James Webb Space Telescope

Cited by

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