A systematic validation of hot Neptunes in TESS data

Abstract

We statistically validated a sample of hot Neptune candidates applying a two-step vetting technique using DAVE and TRICERATOPS. We performed a systematic validation of 250 transit-like events in the Transiting Exoplanet Survey Satellite (TESS) archive in the parameter region defined by $P\le 4$ d and $3R_{\oplus }\le R\le 5R_{\oplus }$. Through our analysis, we identified 18 hot Neptune-sized candidates, with a false positive probability $<50\%$. Nine of these planet candidates still need to be confirmed. For each of the nine targets we retrieved the stellar parameters using ARIADNE and derived constraints on the planetary parameters by fitting the lightcurves with the juliet package. Within this sample of nine candidates, we statistically validated (i.e, with false positive probability < $0.3\%$) two systems (TOI-277 b and TOI-1288 b) by re-processing the candidates with TRICERATOPS along with follow-up observations. These new validated exoplanets expand the known hot Neptunes population and are high-priority targets for future radial velocities follow-up.

arXiv comment24 pages, 20 figures. Accepted for publication on MNRAS

References in corpus (54)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• Gaia Data Release 2. Summary of the contents and survey properties
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• The Transiting Exoplanet Survey Satellite
• MultiNest: an efficient and robust Bayesian inference tool for cosmology and particle physics
• The Eleventh and Twelfth Data Releases of the Sloan Digital Sky Survey: Final Data from SDSS-III
• dynesty: A Dynamic Nested Sampling Package for Estimating Bayesian Posteriors and Evidences
• Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties
• A new extensive library of PHOENIX stellar atmospheres and synthetic spectra
• X-ray spectral modelling of the AGN obscuring region in the CDFS: Bayesian model selection and catalogue
• A 3D Dust Map Based on Gaia, Pan-STARRS 1 and 2MASS
• Kepler Mission Design, Realized Photometric Performance, and Early Science
• batman: BAsic Transit Model cAlculatioN in Python
• Fast and scalable Gaussian process modeling with applications to astronomical time series
• Efficient, uninformative sampling of limb darkening coefficients for two-parameter laws
• Towards Better Age Estimates for Stellar Populations: The Y^2 Isochrones for Solar Mixture
• Architecture and Dynamics of Kepler's Candidate Multiple Transiting Planet Systems
• The TESS Input Catalog and Candidate Target List
• Understanding the Mass-Radius Relation for Sub-Neptunes: Radius as a Proxy for Composition
• Probabilistic Forecasting of the Masses and Radii of Other Worlds
• A Framework for Prioritizing the TESS Planetary Candidates Most Amenable to Atmospheric Characterization
• Validation of Kepler's Multiple Planet Candidates. III: Light Curve Analysis & Announcement of Hundreds of New Multi-planet Systems
• Dearth of short-period Neptunian exoplanets - a desert in period-mass and period-radius planes
• Juliet: a versatile modelling tool for transiting and non-transiting exoplanetary systems
• Dynamic nested sampling: an improved algorithm for parameter estimation and evidence calculation
• Understanding The Effects Of Stellar Multiplicity On The Derived Planet Radii From Transit Surveys: Implications for Kepler, K2, and TESS
• Atmospheric Escape and the Evolution of Close-in Exoplanets
• Hot super-Earths stripped by their host stars
• An Efficient Automated Validation Procedure for Exoplanet Transit Candidates
• The Kepler Follow-Up Observation Program. I. A Catalog of Companions to Kepler Stars from High-Resolution Imaging
• Photoevaporation and High-Eccentricity Migration Created the Sub-Jovian Desert
• SOAR TESS Survey. I: Sculpting of TESS planetary systems by stellar companions
• A short-period censor of sub-Jupiter mass exoplanets with low density
• Occurrence Rates of Planets orbiting FGK Stars: Combining Kepler DR25, Gaia DR2 and Bayesian Inference
• Photometric detection of non-transiting short-period low-mass companions through the beaming, ellipsoidal and reflection effects in Kepler and CoRoT lightcurves
• Emerging Trends in a Period-Radius Distribution of Close-in Planets
• A new catalogue of Stroemgren-Crawford uvbybeta photometry
• Vetting of 384 TESS Objects of Interest with TRICERATOPS and Statistical Validation of 12 Planet Candidates
• ARIADNE: Measuring accurate and precise stellar parameters through SED fitting
• Demystifying Kepler Data: A Primer for Systematic Artifact Mitigation
• The astrophysics of visible-light orbital phase curves in the space age
• Planetary population synthesis
• An Ultra-Hot Neptune in the Neptune desert
• The sub-Neptune desert and its dependence on stellar type: Controlled by lifetime X-ray irradiation
• Discovery and Vetting of Exoplanets I: Benchmarking K2 Vetting Tools
• Survival of a planet in short-period Neptunian desert under effect of photo-evaporation
• SOAR TESS Survey. II: The impact of stellar companions on planetary populations
• A Closer Look at Exoplanet Occurrence Rates: Considering the Multiplicity of Stars Without Detected Planets
• ShaneAO: wide science spectrum adaptive optics system for the Lick Observatory
• Architectures of Exoplanetary Systems. II: An Increase in Inner Planetary System Occurrence Toward Later Spectral Types for Kepler's FGK Dwarfs
• Commissioning ShARCS: the Shane Adaptive optics infraRed Camera-Spectrograph for the Lick Observatory 3-m telescope
• Search for H3+ in HD141569A
• The TESS Triple-9 Catalog: 999 uniformly vetted candidate exoplanets

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• Hundreds of TESS exoplanets might be larger than we thought
• The TESS Triple-9 Catalog II: a new set of 999 uniformly-vetted exoplanet candidates
• DIAmante TESS AutoRegressive Planet Search (DTARPS): II. Hundreds of New TESS Candidate Exoplanets
• DART-Vetter: A Deep LeARning Tool for automatic triage of exoplanet candidates