The EBLM Project IV. Spectroscopic orbits of over 100 eclipsing M dwarfs masquerading as transiting hot-Jupiters

Abstract

We present 2271 radial velocity measurements taken on 118 single-line binary stars, taken over eight years with the CORALIE spectrograph. The binaries consist of F/G/K primaries and M-dwarf secondaries. They were initially discovered photometrically by the WASP planet survey, as their shallow eclipses mimic a hot-Jupiter transit. The observations we present permit a precise characterisation of the binary orbital elements and mass function. With modelling of the primary star this mass function is converted to a mass of the secondary star. In the future, this spectroscopic work will be combined with precise photometric eclipses to draw an empirical mass/radius relation for the bottom of the mass sequence. This has applications in both stellar astrophysics and the growing number of exoplanet surveys around M-dwarfs. In particular, we have discovered 34 systems with a secondary mass below $0.2M_{\odot }$, and so we will ultimately double the known number of very low-mass stars with well characterised mass and radii. We are able to detect eccentricities as small as 0.001 and orbital periods to sub-second precision. Our sample can revisit some earlier work on the tidal evolution of close binaries, extending it to low mass ratios. We find some binaries that are eccentric at orbital periods < 3 days, while our longest circular orbit has a period of 10.4 days. By collating the EBLM binaries with published WASP planets and brown dwarfs, we derive a mass spectrum with twice the resolution of previous work. We compare the WASP/EBLM sample of tightly-bound orbits with work in the literature on more distant companions up to 10 AU. We note that the brown dwarf desert appears wider, as it carves into the planetary domain for our short-period orbits. This would mean that a significantly reduced abundance of planets begins at $\sim 3M_{\mathrm{Jup}}$, well before the Deuterium-burning limit. [abridged]

arXiv comment14 pages, 12 figures, 7 Tables. Under review at A&A, corrections after comments by the referee

References in corpus (80)

• emcee: The MCMC Hammer
• Galactic Stellar and Substellar Initial Mass Function
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• The USNO-B Catalog
• The Dartmouth Stellar Evolution Database
• The K2 Mission: Characterization and Early results
• Seven temperate terrestrial planets around the nearby ultracool dwarf star TRAPPIST-1
• New evolutionary models for pre-main sequence and main sequence low-mass stars down to the hydrogen-burning limit
• Shrinking binary and planetary orbits by Kozai cycles with tidal friction
• The PLATO 2.0 Mission
• The WASP Project and the SuperWASP Cameras
• Planet Occurrence within 0.25 AU of Solar-type Stars from Kepler
• The Occurrence and Architecture of Exoplanetary Systems
• No planet for HD 166435
• Obliquities of Hot Jupiter host stars: Evidence for tidal interactions and primordial misalignments
• Temperate Earth-sized planets transiting a nearby ultracool dwarf star
• Probabilistic Forecasting of the Masses and Radii of Other Worlds
• Stellar, brown dwarf and multiple star properties from a radiation hydrodynamical simulation of star cluster formation
• Absolute dimensions of the M-type eclipsing binary YY Geminorum (Castor C): a challenge to evolutionary models in the lower main-sequence
• The Solar Neighborhood XVII: Parallax Results from the CTIOPI 0.9m Program -- Twenty New Members of the RECONS 10 Parsec Sample
• Spin-orbit angle measurements for six southern transiting planets; New insights into the dynamical origins of hot Jupiters
• Tertiary companions to close spectroscopic binaries
• The signature of orbital motion from the dayside of the planet tau Bootis b
• Design Considerations for a Ground-based Transit Search for Habitable Planets Orbiting M dwarfs
• How Dry is the Brown Dwarf Desert?: Quantifying the Relative Number of Planets, Brown Dwarfs and Stellar Companions around Nearby Sun-like Stars
• The N2K Consortium. II. A Transiting Hot Saturn Around HD 149026 With a Large Dense Core
• A seven-planet resonant chain in TRAPPIST-1
• Efficient identification of exoplanetary transit candidates from SuperWASP light curves
• Friends of Hot Jupiters I: A Radial Velocity Search for Massive, Long-Period Companions to Close-In Gas Giant Planets
• A new list of thorium and argon spectral lines in the visible
• A Robust Measure of Tidal Circularization in Coeval Binary Populations: The solar-type spectroscopic Binary Population in The Open Cluster M35
• Science performance of Gaia, ESA's space-astrometry mission
• SOPHIE velocimetry of Kepler transit candidates XVII. The physical properties of giant exoplanets within 400 days of period
• A giant planet undergoing extreme ultraviolet irradiation by its hot massive-star host
• Stellar Diameters and Temperatures III. Main Sequence A, F, G, & K Stars: Additional high-precision measurements and empirical relations
• The CORALIE survey for southern extra-solar planets IX. A 1.3-day period brown dwarf disguised as a planet
• HATSouth: a global network of fully automated identical wide-field telescopes
• The Mass of the Convective Zone in FGK Main Sequence Stars and the Effect of Accreted Planetary Material on Apparent Metallicity Determinations
• A combined transmission spectrum of the Earth-sized exoplanets TRAPPIST-1 b and c
• WASP-17b: an ultra-low density planet in a probable retrograde orbit
• Search for brown-dwarf companions of stars
• On the tidal interaction of a solar-type star with an orbiting companion: Excitation of g mode oscillation and orbital evolution
• Mass-radius relation of low and very low-mass stars revisited with the VLTI
• Statistical properties of exoplanets. I. The period distribution: constraints for the migration scenario
• Weighing The Non-Transiting Hot Jupiter Tau BOO b
• The KELT-South Telescope
• Statistical Properties of Brown Dwarf Companions: Implications for Different Formation Mechanisms
• The HARPS search for southern extra-solar planets XIX. Characterization and dynamics of the GJ876 planetary system
• The HARPS-N Rocky Planet Search I. HD219134b: A transiting rocky planet in a multi-planet system at 6.5 pc from the Sun
• WASP-4b: a 12th-magnitude transiting hot-Jupiter in the Southern hemisphere
• The EBLM Project I-Physical and orbital parameters, including spin-orbit angles, of two low-mass eclipsing binaries on opposite sides of the Brown Dwarf limit
• A Definition for Giant Planets Based on the Mass-Density Relationship
• WASP-80b has a dayside within the T-dwarf range
• EL CVn-type binaries - Discovery of 17 helium white dwarf precursors in bright eclipsing binary star systems
• On the tidal origin of hot Jupiter stellar obliquity trends
• The CORALIE survey for southern extrasolar planets. XVI. Discovery of a planetary system around HD 147018 and of two long period and massive planets orbiting HD 171238 and HD 204313
• Line-profile variations in radial-velocity measurements: Two alternative indicators for planetary searches
• WIYN Open Cluster Study. LX. Spectroscopic Binary Orbits in NGC 6819
• HAT-P-14b: A 2.2 Jupiter-mass exoplanet transiting a bright F star
• Hot Jupiters with relatives: discovery of additional planets in orbit around WASP-41 and WASP-47
• The CORALIE survey for southern extrasolar planets XVII. New and updated long period and massive planets
• The SDSS-2MASS-WISE Ten Dimensional Stellar Color Locus
• The GAPS Programme with HARPS-N at TNG. III: The retrograde orbit of HAT-P-18b
• Characterization of a spurious one-year signal in HARPS data
• Eccentricity and Spin-Orbit Misalignment in Short-Period Stellar Binaries as a Signpost of Hidden Tertiary Companions
• WASP-94 A and B planets: hot-Jupiter cousins in a twin-star system
• The BANANA project. V. Misaligned and precessing stellar rotation axes in CV Velorum
• The Tidal Circularization Cutoff Period of the Old Open Cluster NGC188
• First limits on the occurrence rate of short-period planets orbiting brown dwarfs
• WASP-23b: a transiting hot Jupiter around a K dwarf and its Rossiter-McLaughlin effect
• SOPHIE velocimetry of Kepler transit candidates. XIII. KOI-189 B and KOI-686 B: two very low-mass stars in long-period orbits
• The EBLM project III. A Saturn-size low-mass star at the hydrogen-burning limit
• WASP-117b: a 10-day-period Saturn in an eccentric and misaligned orbit
• Rossiter-McLaughlin Observations of 55 Cnc e
• The EBLM project. II. A very hot, low-mass M dwarf in an eccentric and long period eclipsing binary system from SuperWASP
• Colour-Magnitude Diagrams of Transiting Exoplanets. I - Systems with parallaxes
• WASP-120b, WASP-122b and WASP-123b: Three newly discovered planets from the WASP-South survey
• ASTEP South: An Antarctic Search for Transiting ExoPlanets around the celestial South pole
• The SOPHIE search for northern extrasolar planets VIII. Follow-up of ELODIE candidates: long-period brown-dwarf companions
• Photometric transit search for planets around cool stars from the western Italian Alps: A pilot study

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