A sub-Neptune transiting the young field star HD 18599 at 40 pc
arXiv:2210.08179 · doi:10.1093/mnras/stad894
Abstract
Transiting exoplanets orbiting young nearby stars are ideal laboratories for testing theories of planet formation and evolution. However, to date only a handful of stars with age <1 Gyr have been found to host transiting exoplanets. Here we present the discovery and validation of a sub-Neptune around HD 18599, a young (300 Myr), nearby (d=40 pc) K star. We validate the transiting planet candidate as a bona fide planet using data from the TESS, Spitzer, and Gaia missions, ground-based photometry from IRSF, LCO, PEST, and NGTS, speckle imaging from Gemini, and spectroscopy from CHIRON, NRES, FEROS, and Minerva-Australis. The planet has an orbital period of 4.13 d, and a radius of 2.7Rearth. The RV data yields a 3-sigma mass upper limit of 30.5Mearth which is explained by either a massive companion or the large observed jitter typical for a young star. The brightness of the host star (V~9 mag) makes it conducive to detailed characterization via Doppler mass measurement which will provide a rare view into the interior structure of young planets.
arXiv commentsubmitted to MNRAS
References in corpus (102)
- Gaia Data Release 2. Summary of the contents and survey properties
- dynesty: A Dynamic Nested Sampling Package for Estimating Bayesian Posteriors and Evidences
- 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
- The California-Kepler Survey. III. A Gap in the Radius Distribution of Small Planets
- Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics
- Las Cumbres Observatory Global Telescope Network
- Kepler Presearch Data Conditioning II - A Bayesian Approach to Systematic Error Correction
- Efficient, uninformative sampling of limb darkening coefficients for two-parameter laws
- Ages for illustrative field stars using gyrochronology: viability, limitations and errors
- Kepler Presearch Data Conditioning I - Architecture and Algorithms for Error Correction in Kepler Light Curves
- Gaia Data Release 2: using Gaia parallaxes
- 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)
- Star counts in the Galaxy. Simulating from very deep to very shallow photometric surveys with the TRILEGAL code
- A Framework for Prioritizing the TESS Planetary Candidates Most Amenable to Atmospheric Characterization
- BANYAN. XI. The BANYAN multivariate Bayesian algorithm to identify members of young associations within 150 pc
- Accurate, Empirical Radii and Masses of Planets and their Host Stars with Gaia Parallaxes
- On the use of empirical bolometric corrections for stars
- Sculpting the Valley in the Radius Distribution of Small Exoplanets as a by-product of Planet Formation: The Core-Powered Mass-Loss Mechanism
- The Lick Planet Search: Detectability and Mass Thresholds
- Dearth of short-period Neptunian exoplanets - a desert in period-mass and period-radius planes
- 3.6 and 4.5 Micron Phase Curves and Evidence for Non-Equilibrium Chemistry in the Atmosphere of Extrasolar Planet HD 189733b
- Evidence for a systematic offset of -80 micro-arcseconds in the Gaia DR2 parallaxes
- Prospects for the Characterization and Confirmation of Transiting Exoplanets via the Rossiter-McLaughlin Effect
- Kepler Data Validation I -- Architecture, Diagnostic Tests, and Data Products for Vetting Transiting Planet Candidates
- Limb and gravity-darkening coefficients for the TESS satellite at several metallicities, surface gravities, and microturbulent velocities
- KELT-1b: A Strongly Irradiated, Highly Inflated, Short Period, 27 Jupiter-mass Companion Transiting a mid-F Star
- Clusters and mirages: cataloguing stellar aggregates in the Milky Way
- Water Delivery and Giant Impacts in the 'Grand Tack' Scenario
- An Efficient Automated Validation Procedure for Exoplanet Transit Candidates
- Chromospheric activity catalogue of 4454 cool stars. Questioning the active branch of stellar activity cycles
- Transit Least Squares: Optimized transit detection algorithm to search for periodic transits of small planets
- A planet within the debris disk around the pre-main-sequence star AU Microscopii
- CERES: A Set of Automated Routines for Echelle Spectra
- 197 Candidates and 104 Validated Planets in K2's First Five Fields
- Eclipsing Binary Stars as Benchmarks for Trigonometric Parallaxes in the Gaia Era
- TESS Discovery of a Transiting Super-Earth in the Mensae System
- A Neptune-sized transiting planet closely orbiting a 5-10-million-year-old star
- The Gaia-Kepler Stellar Properties Catalog. II. Planet Radius Demographics as a Function of Stellar Mass and Age
- Empirical, Accurate Masses and Radii of Single Stars with TESS and Gaia
- Zodiacal Exoplanets in Time (ZEIT) III: A short-period planet orbiting a pre-main-sequence star in the Upper Scorpius OB Association
- 275 Candidates and 149 Validated Planets Orbiting Bright Stars in K2 Campaigns 0-10
- Vetting of 384 TESS Objects of Interest with TRICERATOPS and Statistical Validation of 12 Planet Candidates
- TESS Hunt for Young and Maturing Exoplanets (THYME): A planet in the 45 Myr Tucana-Horologium association
- The KELT-South Telescope
- ELLC - a fast, flexible light curve model for detached eclipsing binary stars and transiting exoplanets
- Four newborn planets transiting the young solar analog V1298 Tau
- BANYAN. XIII. A First Look at Nearby Young Associations with Gaia Data Release 2
- Minerva-Australis I: Design, Commissioning, & First Photometric Results
- TESS Hunt for Young and Maturing Exoplanets (THYME) II: A 17 Myr Old Transiting Hot Jupiter in the Sco-Cen Association
- The Formation of Jupiter's Diluted Core by a Giant Impact
- Transiting exoplanet candidates from K2 Campaigns 5 and 6
- Variability Properties of 4 Million Sources in the Input Catalog Observed with the Kilodegree Extremely Little Telescope Survey
- Separating planetary reflex Doppler shifts from stellar variability in the wavelength domain
- TESS reveals that the nearby Pisces-Eridanus stellar stream is only 120 Myr old
- Repeatability and Accuracy of Exoplanet Eclipse Depths Measured with Post-Cryogenic Spitzer
- Forming Mercury by Giant Impacts
- TESS Hunt for Young and Maturing Exoplanets (THYME) VI: an 11 Myr giant planet transiting a very low-mass star in Lower Centaurus Crux
- TESS delivers its first Earth-sized planet and a warm sub-Neptune
- 60 Validated Planets from K2 Campaigns 5-8
- Consequences of Giant Impacts on Early Uranus for Rotation, Internal Structure, Debris, and Atmospheric Erosion
- Simulated JWST/NIRISS Transit Spectroscopy of Anticipated TESS Planets Compared to Select Discoveries from Space-Based and Ground-Based Surveys
- The consequences of planetary migration on the minor bodies of the early Solar System
- The discovery and mass measurement of a new ultra-short-period planet: EPIC~228732031b
- Predicting Exoplanets Mass and Radius: A Nonparametric Approach
- Cluster Difference Imaging Photometric Survey. II. TOI 837: A Young Validated Planet in IC 2602
- Solar System Physics for Exoplanet Research
- The Capture of Trojan Asteroids by the Giant Planets During Planetary Migration
- Evolutionary Models of Super-Earths and Mini-Neptunes Incorporating Cooling and Mass Loss
- SOAR TESS Survey. II: The impact of stellar companions on planetary populations
- Origin and Dynamical Evolution of Neptune Trojans - II: Long Term Evolution
- IRSF SIRIUS JHKs Simultaneous Transit Photometry of GJ1214b
- Simultaneous TESS and NGTS Transit Observations of WASP-166b
- A Relationship Between Stellar Age and Spot Coverage
- Unresolved Binary Exoplanet Host Stars Fit as Single Stars: Effects on the Stellar Parameters
- The young HD 73583 (TOI-560) planetary system: Two 10-M mini-Neptunes transiting a 500-Myr-old, bright, and active K dwarf
- KELT-10b: The First Transiting Exoplanet from the KELT-South Survey -- A Hot Sub-Jupiter Transiting a V = 10.7 Early G-Star
- A well aligned orbit for the 45 Myr old transiting Neptune DS Tuc Ab
- BAFFLES: Bayesian Ages for Field Lower-Mass Stars
- Spin-orbit alignment and magnetic activity in the young planetary system AU Mic
- Three Small Planets Transiting a Hyades Star
- The EBLM project III. A Saturn-size low-mass star at the hydrogen-burning limit
- The Elusive Majority of Young Moving Groups. I. Young Binaries and Lithium-Rich Stars in the Solar Neighborhood
- Zodiacal Exoplanets in Time. X. The Orbit and Atmosphere of the Young "Neptune Desert"-Dwelling Planet K2-100b
- Contamination from a nearby star cannot explain the anomalous transmission spectrum of the ultra-short period giant planet WASP-103b
- Discovery of a Transiting Adolescent Sub-Neptune Exoplanet with K2
- An Aligned Orbit for the Young Planet V1298 Tau b
- A HARPS RV search for planets around young nearby stars
- Spitzer Observations of Exoplanets Discovered with The Kepler K2 Mission
- Know thy star, know thy planet: Chemo-kinematically characterizing TESS targets
- Shallow transit follow-up from NGTS: simultaneous observations of HD106315 with 11 identical telescopes
- Spitzer transit follow-up of planet candidates from the K2 mission
- TOI-942b: A Prograde Neptune in a ~60 Myr old Multi-transiting System
- The Young Planet DS Tuc Ab has a Low Obliquity
- A 38 Million Year Old Neptune-Sized Planet in the Kepler Field
- TOI-1842b: A Transiting Warm Saturn Undergoing Re-Inflation around an Evolving Subgiant
- A dense mini-Neptune orbiting the bright young star HD 18599
- The Surface Magnetic Activity of the Weak-Line T Tauri Stars TWA 7 and TWA 25
- First radial velocity results from the MINiature Exoplanet Radial Velocity Array (MINERVA)
- Allesfitter: Flexible Star and Exoplanet Inference From Photometry and Radial Velocity
- Formation and Dynamical Evolution of the Neptune Trojans - the Influence of the Initial Solar System Architecture