Validation of HD 183579b using archival radial velocities: a warm-neptune orbiting a bright solar analog

Abstract

As exoplanetary science matures into its third decade, we are increasingly offered the possibility of pre existing, archival observations for newly detected candidates. This is particularly poignant for the TESS mission, whose survey spans bright, nearby dwarf stars in both hemispheres, which are precisely the types of sources targeted by previous radial velocity (RV) surveys. On this basis, we investigated whether any of the TESS Objects of Interest (TOIs) coincided with such observations, from which we find 18 single planet candidate systems. Of these, one exhibits an RV signature that has the correct period and phase matching the transiting planetary candidate with a false alarm probability of less than 1 percent. After further checks, we exploit this fact to validate HD 183579b (TOI-1055b). This planet is less than 4 Earth Radii and has better than 33 percent planetary mass measurements, thus advancing the TESS primary objective of finding 50 such worlds. We find that this planet is amongst the most accessible small transiting planets for atmospheric characterization. Our work highlights that the efforts to confirm and even precisely measure the masses of new transiting planet candidates need not always depend on acquiring new observations - that in some instances these tasks can be completed with existing data.

arXiv comment13 pages, 4 figures, accepted to ApJL, posteriors available at https://github.com/skypalat/toi_validation

References in corpus (53)

• emcee: The MCMC Hammer
• The Transiting Exoplanet Survey Satellite
• MultiNest: an efficient and robust Bayesian inference tool for cosmology and particle physics
• Analytic Lightcurves for Planetary Transit Searches
• The Dartmouth Stellar Evolution Database
• The WASP Project and the SuperWASP Cameras
• The false positive rate of Kepler and the occurrence of planets
• Characteristics of planetary candidates observed by Kepler, II: Analysis of the first four months of data
• The Revised TESS Input Catalog and Candidate Target List
• Efficient, uninformative sampling of limb darkening coefficients for two-parameter laws
• Gaia Data Release 2: using Gaia parallaxes
• Probabilistic Forecasting of the Masses and Radii of Other Worlds
• A Framework for Prioritizing the TESS Planetary Candidates Most Amenable to Atmospheric Characterization
• Wide-field millimagnitude photometry with HAT: A Tool for Extra-solar Planet Detection
• The Transiting Exoplanet Survey Satellite: Simulations of planet detections and astrophysical false positives
• RadVel: The Radial Velocity Modeling Toolkit
• Validation of Kepler's Multiple Planet Candidates. III: Light Curve Analysis & Announcement of Hundreds of New Multi-planet Systems
• The LCES HIRES/Keck Precision Radial Velocity Exoplanet Survey
• False positive probabilties for all Kepler Objects of Interest: 1284 newly validated planets and 428 likely false positives
• HAT-P-11b: A Super-Neptune Planet Transiting a Bright K Star in the Kepler Field
• Evidence for a systematic offset of -80 micro-arcseconds in the Gaia DR2 parallaxes
• Parametrizing the exoplanet eccentricity distribution with the Beta distribution
• Almost All of Kepler's Multiple Planet Candidates are Planets
• An Efficient Automated Validation Procedure for Exoplanet Transit Candidates
• Modeling Kepler transit light curves as false positives: Rejection of blend scenarios for Kepler-9, and validation of Kepler-9d, a super-Earth-size planet in a multiple system
• Exploring Exoplanet Populations with NASA's Kepler Mission
• SOPHIE velocimetry of Kepler transit candidates VII. A false-positive rate of 35% for Kepler close-in giant exoplanet candidates
• A public HARPS radial velocity database corrected for systematic errors
• The Chemical Homogeneity of Sun-like Stars in the Solar Neighborhood
• Evidence for a Large Exomoon Orbiting Kepler-1625b
• Identification of Background False Positives from Kepler Data
• Vetting of 384 TESS Objects of Interest with TRICERATOPS and Statistical Validation of 12 Planet Candidates
• Effects of Orbital Eccentricity on Extrasolar Planet Transit Detection and Lightcurves
• Testing blend scenarios for extrasolar transiting planet candidates. I. -- OGLE-TR-33: a false positive
• Validation of Twelve Small Kepler Transiting Planets in the Habitable Zone
• Investigations of approximate expressions for the transit duration
• The Solar Twin Planet Search III. The [Y/Mg] clock: estimating stellar ages of solar-type stars
• The Anglo-Australian Planet Search XXIV: The Frequency of Jupiter Analogs
• Impact of Orbital Eccentricity on the Detection of Transiting Extrasolar Planets
• Characterizing Distant Worlds with Asterodensity Profiling
• A High False Positive Rate for Kepler Planetary Candidates of Giant Stars using Asterodensity Profiling
• The KELT Follow-Up Network and Transit False Positive Catalog: Pre-vetted False Positives for TESS
• Objects in Kepler's Mirror May be Larger Than They Appear: Bias and Selection Effects in Transiting Planet Surveys
• Bayesian priors for the eccentricity of transiting planets
• Testing blend scenarios for extrasolar transiting planet candidates. II. -- OGLE-TR-56
• GJ 1214b revised. Improved trigonometric parallax, stellar parameters, orbital solution, and bulk properties for the super-Earth GJ 1214b
• Measuring Transit Signal Recovery in the Kepler Pipeline IV: Completeness of the DR25 Planet Candidate catalog
• A resonant pair of warm giant planets revealed by TESS
• Validation of small Kepler transiting planet candidates in or near the habitable zone
• SOPHIE velocimetry of Kepler transit candidates XVIII. Radial velocity confirmation, absolute masses and radii, and origin of the Kepler-419 multiplanetary system
• SOPHIE velocimetry of Kepler transit candidates. XIX. The transiting temperate giant planet KOI-3680b
• On the incidence of \textit{WISE} infrared excess among solar analog, twin and sibling stars
• Radial velocity constraints on the long-period transiting planet Kepler-1625 b with CARMENES

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• Resonant sub-Neptunes are puffier
• Hundreds of TESS exoplanets might be larger than we thought
• TOI-1055 b: Neptunian planet characterised with HARPS, TESS, and CHEOPS
• NIGHT: a compact, near-infrared, high-resolution spectrograph to survey helium in exoplanet systems
• HD 183579b: A Warm Sub-Neptune Transiting a Solar Twin Detected by TESS
• The Magnetically Induced Radial Velocity Variation of Gliese 341 and an Upper Limit to the Mass of Its Transiting Earth-sized Planet
• The Occurrence-weighted Median Planets Discovered by Transit Surveys Orbiting Solar-type Stars and Their Implications for Planet Formation and Evolution
• Improving exoplanet mass characterisation with Bayesian model selection using the Learned Harmonic Mean Estimator