GJ 3929: High Precision Photometric and Doppler Characterization of an Exo-Venus and its Hot, Mini-Neptune-mass Companion

Abstract

We detail the follow up and characterization of a transiting exo-Venus identified by TESS, GJ 3929b, (TOI-2013b) and its non-transiting companion planet, GJ 3929c (TOI-2013c). GJ 3929b is an Earth-sized exoplanet in its star's Venus-zone (P${}_b$ = 2.616272 $\pm$ 0.000005 days; S${}_b$ = 17.3${}_{-0.7}^{+0.8}$ S${}_{\oplus }$) orbiting a nearby M dwarf. GJ 3929c is most likely a non-transiting sub-Neptune. Using the new, ultra-precise NEID spectrometer on the WIYN 3.5 m Telescope at Kitt Peak National Observatory, we are able to modify the mass constraints of planet b reported in previous works and consequently improve the significance of the mass measurement to almost 4$\sigma$ confidence (M${}_b$ = 1.75 $\pm$ 0.45 M${}_{\oplus }$). We further adjust the orbital period of planet c from its alias at 14.30 $\pm$ 0.03 days to the likely true period of 15.04 $\pm$ 0.03 days, and adjust its minimum mass to m$\sin i$ = 5.71 $\pm$ 0.92 M${}_{\oplus }$. Using the diffuser-assisted ARCTIC imager on the ARC 3.5 m telescope at Apache Point Observatory, in addition to publicly available TESS and LCOGT photometry, we are able to constrain the radius of planet b to R${}_p$ = 1.09 $\pm$ 0.04 R${}_{\oplus }$. GJ 3929b is a top candidate for transmission spectroscopy in its size regime (TSM = 14 $\pm$ 4), and future atmospheric studies of GJ 3929b stand to shed light on the nature of small planets orbiting M dwarfs.

arXiv commentAccepted for publication in ApJ. arXiv admin note: text overlap with arXiv:2204.09063

References in corpus (74)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Array Programming with NumPy
• Astropy: A Community Python Package for Astronomy
• emcee: The MCMC Hammer
• 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
• The Gaia mission
• The Transiting Exoplanet Survey Satellite
• Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
• Correcting for the Effects of Interstellar Extinction
• The James Webb Space Telescope
• Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
• Estimating distances from parallaxes IV: Distances to 1.33 billion stars in Gaia Data Release 2
• The generalised Lomb-Scargle periodogram. A new formalism for the floating-mean and Keplerian periodograms
• Habitable Zones Around Main-Sequence Stars: New Estimates
• A 3D Dust Map Based on Gaia, Pan-STARRS 1 and 2MASS
• Las Cumbres Observatory Global Telescope Network
• Fast and scalable Gaussian process modeling with applications to astronomical time series
• The Revised TESS Input Catalog and Candidate Target List
• A box-fitting algorithm in the search for periodic transits
• Efficient, uninformative sampling of limb darkening coefficients for two-parameter laws
• Kepler Presearch Data Conditioning I - Architecture and Algorithms for Error Correction in Kepler Light Curves
• EXOFAST: A fast exoplanetary fitting suite in IDL
• How to Constrain Your M Dwarf: measuring effective temperature, bolometric luminosity, mass, and radius
• The TESS Input Catalog and Candidate Target List
• AstroImageJ: Image Processing and Photometric Extraction for Ultra-Precise Astronomical Light Curves
• AstroImageJ: Image Processing and Photometric Extraction for Ultra-Precise Astronomical Light Curves (Expanded Edition)
• A Framework for Prioritizing the TESS Planetary Candidates Most Amenable to Atmospheric Characterization
• Growth Model Interpretation of Planet Size Distribution
• Wide-field millimagnitude photometry with HAT: A Tool for Extra-solar Planet Detection
• RadVel: The Radial Velocity Modeling Toolkit
• Planets and Stellar Activity: Hide and Seek in the CoRoT-7 system
• An asteroseismic view of the radius valley: stripped cores, not born rocky
• Improving the Efficiency of Markov Chain Monte Carlo for Analyzing the Orbits of Extrasolar Planets
• Spectrum radial velocity analyser (SERVAL). High-precision radial velocities and two alternative spectral indicators
• Exoplanet Atmospheres
• STARRY: Analytic Occultation Light Curves
• Precision Stellar Characterization of FGKM Stars using an Empirical Spectral Library
• KELT-1b: A Strongly Irradiated, Highly Inflated, Short Period, 27 Jupiter-mass Companion Transiting a mid-F Star
• Transit Least Squares: Optimized transit detection algorithm to search for periodic transits of small planets
• eleanor: An open-source tool for extracting light curves from the TESS Full-Frame Images
• On the Metal-Richness of M Dwarfs with Planets
• The Habitable-Zone Planet Finder: A Stabilized Fiber-Fed NIR Spectrograph for the Hobby-Eberly Telescope
• A planetary system around the nearby M dwarf GJ 667C with at least one super-Earth in its habitable zone
• Ten Year Review of Queue Scheduling of the Hobby-Eberly Telescope
• Analytic Planetary Transit Light Curves and Derivatives for Stars with Polynomial Limb Darkening
• The CARMENES search for exoplanets around M dwarfs -- Planet occurrence rates from a subsample of 71 stars
• Correcting for Telluric Absorption: Methods, Case Studies, and Release of the TelFit Code
• The California-Kepler Survey. X. The Radius Gap as a Function of Stellar Mass, Metallicity, and Age
• Python Leap Second Management and Implementation of Precise Barycentric Correction (barycorrpy)
• Atmospheres from very low-mass stars to extrasolar planets
• The Precision of Mass Measurements Required for Robust Atmospheric Characterization of Transiting Exoplanets
• Kepler-21b: A rocky planet around a V = 8.25 magnitude star
• Towards Space-like Photometric Precision from the Ground with Beam-Shaping Diffusers
• Masses and compositions of three small planets orbiting the nearby M dwarf L231-32 (TOI-270) and the M dwarf radius valley
• A Versatile Technique to Enable sub-milli-Kelvin Instrument Stability for Precise Radial Velocity Measurements: Tests with the Habitable-zone Planet Finder
• The Warm Neptune GJ 3470b has a Polar Orbit
• Radial velocity follow-up of GJ1132 with HARPS. A precise mass for planet 'b' and the discovery of a second planet
• GJ 367b: A dense ultra-short period sub-Earth planet transiting a nearby red dwarf star
• 44 Validated Planets from K2 Campaign 10
• A sub-Neptune sized planet transiting the M2.5-dwarf G 9-40: Validation with the Habitable-zone Planet Finder
• Mass-Radius relationship for M dwarf exoplanets: Comparing nonparametric and parametric methods
• Overview of the spectrometer optical fiber feed for the Habitable-zone Planet Finder
• The TESS-Keck Survey II: An Ultra-Short Period Rocky Planet and its Siblings Transiting the Galactic Thick-Disk Star TOI-561
• AstraLux: the Calar Alto Lucky Imaging Camera
• TESS-Keck Survey IX: Masses of Three Sub-Neptunes Orbiting HD 191939 and the Discovery of a Warm Jovian Plus a Distant Sub-Stellar Companion
• Predicting the Yield of Potential Venus Analogs from TESS and their Potential for Atmospheric Characterization
• HATS-25b through HATS-30b: A Half-dozen New Inflated Transiting Hot Jupiters from the HATSouth Survey
• An Increase in Small-planet Occurrence with Metallicity for Late-type Dwarf Stars in the Kepler Field and Its Implications for Planet Formation
• TOI-532b: The Habitable-zone Planet Finder confirms a Large Super Neptune in the Neptune Desert orbiting a metal-rich M dwarf host
• Discovery and mass measurement of the hot, transiting, Earth-sized planet GJ 3929 b
• Swimming with ShARCS: Comparison of On-sky Sensitivity With Model Predictions for ShaneAO on the Lick Observatory 3-meter Telescope
• A hot Mars-sized exoplanet transiting an M dwarf
• TOI-1696 and TOI-2136: Constraining the Masses of Two Mini-Neptunes with HPF

Cited by in corpus (4)

• The JWST Rocky Worlds DDT Program reveals GJ 3929b to likely be a bare rock
• KOBE-1: The first planetary system from the KOBE survey. Two planets likely residing in the sub-Neptune mass regime around a late K-dwarf
• Atmospheric collapse and re-inflation through impacts for terrestrial planets around M dwarfs
• GJ 3929 b as the First Complete Rocky Worlds DDT Data Set