HATS-70b: A 13 Mjup brown dwarf transiting an A star
arXiv:1811.06925 · doi:10.3847/1538-3881/aaf1bb
Abstract
We report the discovery of HATS-70b, a transiting brown dwarf at the deuterium burning limit. HATS-70b has a mass of Mp=12.9 +1.8/-1.6 Mjup and a radius of Rp=1.384 +0.079/-0.074 Rjup, residing in a close-in orbit with a period of 1.89 days. The host star is a M*=1.78 +/- 0.12 Msun A star rotating at vsini=40.61 +0.32/-0.35 km/s, enabling us to characterize the spectroscopic transit of the brown dwarf via Doppler tomography. We find that HATS-70b, like other massive planets and brown dwarfs previously sampled, orbits in a low projected-obliquity orbit with lambda=8.9 +5.6/-4.5 deg. The low obliquities of these systems is surprising given all brown dwarf and massive planets with obliquities measured orbit stars hotter than the Kraft break. This trend is tentatively inconsistent with dynamically chaotic migration for systems with massive companions, though the stronger tidal influence of these companions makes it difficult to draw conclusions on the primordial obliquity distribution of this population. We also introduce a modeling scheme for planets around rapidly rotating stars, accounting for the influence of gravity darkening on the derived stellar and planetary parameters.
arXiv commentAccepted for publication in AJ
References in corpus (88)
- emcee: The MCMC Hammer
- Gaia Data Release 2. Summary of the contents and survey properties
- Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
- The generalised Lomb-Scargle periodogram. A new formalism for the floating-mean and Keplerian periodograms
- The Dartmouth Stellar Evolution Database
- Grids of stellar models with rotation - I. Models from 0.8 to 120 Msun at solar metallicity (Z = 0.014)
- Evolutionary models for cool brown dwarfs and extrasolar giant planets. The case of HD 20945
- Stellar Multiplicity
- Las Cumbres Observatory Global Telescope Network
- Planetary Radii across Five Orders of Magnitude in Mass and Stellar Insolation: Application to Transits
- A box-fitting algorithm in the search for periodic transits
- Hot Stars with Hot Jupiters Have High Obliquities
- Giant Planet Occurrence in the Stellar Mass-Metallicity Plane
- Optimal Techniques in Two-dimensional Spectroscopy: Background Subtraction for the 21st Century
- Obliquities of Hot Jupiter host stars: Evidence for tidal interactions and primordial misalignments
- Origins of Eccentric Extrasolar Planets: Testing the Planet-Planet Scattering Model
- Spin-orbit angle measurements for six southern transiting planets; New insights into the dynamical origins of hot Jupiters
- Stellar, Brown Dwarf, and Multiple Star Properties from Hydrodynamical Simulations of Star Cluster Formation
- HAT-P-11b: A Super-Neptune Planet Transiting a Bright K Star in the Kepler Field
- How Dry is the Brown Dwarf Desert?: Quantifying the Relative Number of Planets, Brown Dwarfs and Stellar Companions around Nearby Sun-like Stars
- Possible Solutions to the Radius Anomalies of Transiting Giant Planets
- Evidence for a systematic offset of -80 micro-arcseconds in the Gaia DR2 parallaxes
- The Transit Light Curve Project. IX. Evidence for a Smaller Radius of the Exoplanet XO-3b
- Line-profile tomography of exoplanet transits -- II. A gas-giant planet transiting a rapidly-rotating A5 star
- KELT-1b: A Strongly Irradiated, Highly Inflated, Short Period, 27 Jupiter-mass Companion Transiting a mid-F Star
- Inflating Hot Jupiters With Ohmic Dissipation
- A Trend Filtering Algorithm for wide field variability surveys
- Exoplanetary Spin-Orbit Alignment: Results from the Ensemble of Rossiter-McLaughlin Observations
- Characterization of exoplanets from their formation II: The planetary mass-radius relationship
- Gravity darkening in rotating stars
- Transiting exoplanets from the CoRoT space mission VI. CoRoT-Exo-3b: The first secure inhabitant of the brown-dwarf desert
- CERES: A Set of Automated Routines for Echelle Spectra
- Tidal Evolution of Close-in Planets
- The Evolution of Early-Type Galaxies in Distant Clusters II: Internal Kinematics of 55 Galaxies in the z=0.33 Cluster CL1358+62
- HATSouth: a global network of fully automated identical wide-field telescopes
- Misaligned spin-orbit in the XO-3 planetary system?
- Search for brown-dwarf companions of stars
- HD147506b: A Super-Massive Planet in an Eccentric Orbit Transiting a Bright Star
- The Rossiter-McLaughlin effect of CoRoT-3b & HD189733b
- The Sun as a planet-host star: Proxies from SDO images for HARPS radial-velocity variations
- XO-3b: A Massive Planet in an Eccentric Orbit Transiting an F5V Star
- Evidence of an Upper Bound on the Masses of Planets and its Implications for Giant Planet Formation
- Statistical Properties of Brown Dwarf Companions: Implications for Different Formation Mechanisms
- The Dependence of Brown Dwarf Radii on Atmospheric Metallicity and Clouds: Theory and Comparison with Observations
- Two Classes of Hot Jupiters
- WASP-30b: a 61 Mjup brown dwarf transiting a V=12, F8 star
- Transit Lightcurves of Extrasolar Planets Orbiting Rapidly-Rotating Stars
- The TESS-HERMES survey Data Release 1: high-resolution spectroscopy of the TESS southern continuous viewing zone
- Atmospheric Characterization of the Hot Jupiter Kepler-13Ab
- On the Spin-Orbit Misalignment of the XO-3 Exoplanetary System
- Bayesian Ages for Early-Type Stars from Isochrones Including Rotation, and a Possible Old Age for the Hyades
- Calibration of Equilibrium Tide Theory for Extrasolar Planet Systems II
- Constraining Tidal Dissipation in Stars from The Destruction Rates of Exoplanets
- Detection Of KOI-13.01 Using The Photometric Orbit
- Transiting exoplanets from the CoRoT space mission. XV. CoRoT-15b: a brown dwarf transiting companion
- LHS6343C: A Transiting Field Brown Dwarf Discovered by the Kepler Mission
- The properties of planets around giant stars
- Factors Affecting the Radii of Close-in Transiting Exoplanets
- Spin-Orbit Alignment for the Eccentric Exoplanet HD 147506b
- On internal wave breaking and tidal dissipation near the centre of a solar-type star
- SOPHIE velocimetry of Kepler transit candidates III. KOI-423b: an 18 Mjup transiting companion around an F7IV star
- HATS-1b: The First Transiting Planet Discovered by the HATSouth Survey
- Refined parameters and spectroscopic transit of the super-massive planet HD147506b
- Hierarchical Bayesian calibration of tidal orbit decay rates among hot Jupiters
- SOPHIE velocimetry of Kepler transit candidates IX. KOI-415 b: a long-period, eccentric transiting brown dwarf to an evolved Sun
- Transiting exoplanets from the CoRoT space mission XXVIII. CoRoT-33b, an object in the brown dwarf desert with 2:3 commensurability with its host star
- NLTT 41135: a field M-dwarf + brown dwarf eclipsing binary in a triple system, discovered by the MEarth observatory
- Companions to APOGEE Stars I: A Milky Way-Spanning Catalog of Stellar and Substellar Companion Candidates and their Diverse Hosts
- EPIC 219388192 b - an inhabitant of the brown dwarf desert in the Ruprecht 147 open cluster
- Ks band secondary eclipses of WASP-19b and WASP-43b with the Anglo-Australian Telescope
- EPIC201702477b: A Long Period Transiting Brown Dwarf from K2
- WASP-167b/KELT-13b: Joint discovery of a hot Jupiter transiting a rapidly-rotating F1V star
- Improved parameters of seven Kepler giant companions characterized with SOPHIE and HARPS-N
- HATS-8b: A Low-Density Transiting Super-Neptune
- SOPHIE velocimetry of Kepler transit candidates. XIII. KOI-189 B and KOI-686 B: two very low-mass stars in long-period orbits
- KELT-19Ab: A P~4.6 Day Hot Jupiter Transiting a Likely Am Star with a Distant Stellar Companion
- KOI-200b and KOI-889b: two transiting exoplanets detected and characterized with Kepler, SOPHIE and HARPS-N
- WASP-128b: a transiting brown dwarf in the dynamical-tide regime
- HAT-P-67b: An Extremely Low Density Saturn Transiting an F-Subgiant Confirmed via Doppler Tomography
- The Broadband and Spectrally-Resolved H-band Eclipse of KELT-1b and the Role of Surface Gravity in Stratospheric Inversions in Hot Jupiters
- The warm Neptunes around HD 106315 have low stellar obliquities
- Tidal Downsizing Model. III. Planets from sub-Earths to Brown Dwarfs: structure and metallicity preferences
- Further Observations of the Tilted Planet XO-3: A New Determination of Spin-Orbit Misalignment, and Limits on Differential Rotation
- Binaries among low-mass stars in nearby young moving groups
- HATS-25b through HATS-30b: A Half-dozen New Inflated Transiting Hot Jupiters from the HATSouth Survey
- On the diversity in mass and orbital radius of giant planets formed via disk instability
- Transiting exoplanets from the CoRoT space mission XXV. CoRoT-27b: a massive and dense planet on a short-period orbit
- Spin-Orbit Misalignment and Precession in the Kepler-13Ab Planetary System
Cited by in corpus (43)
- Stellar obliquities in exoplanetary systems
- Two new HATNet hot Jupiters around A stars, and the first glimpse at the occurrence rate of hot Jupiters from TESS
- TESS Transit Timing of Hundreds of Hot Jupiters
- Mass loss rate and local thermodynamic state of KELT-9 b thermosphere from the hydrogen Balmer series
- ExoClock Project III: 450 new exoplanet ephemerides from ground and space observations
- Two intermediate-mass transiting brown dwarfs from the TESS mission
- A well aligned orbit for the 45 Myr old transiting Neptune DS Tuc Ab
- TOI-2109b: An Ultrahot Gas Giant on a 16 hr Orbit
- Populating the brown dwarf and stellar boundary: Five stars with transiting companions near the hydrogen-burning mass limit
- TOI-811b and TOI-852b: New transiting brown dwarfs with similar masses and very different radii and ages from the TESS mission
- TOI-503: The first known brown dwarf-Am star binary from the TESS mission
- DREAM II. The spin-orbit angle distribution of close-in exoplanets under the lens of tides
- Obliquities of Exoplanet Host Stars: 19 New and Updated Measurements, and Trends in the Sample of 205 Measurements
- KELT-25b and KELT-26b: A Hot Jupiter and a Substellar Companion Transiting Young A-stars Observed by TESS
- New substellar discoveries from Kepler and K2: Is there a brown dwarf desert?
- NLTT5306B: an inflated, weakly irradiated brown dwarf
- The PLATO field selection process. II. Characterization of LOPS2, the first long-pointing field
- Three new brown dwarfs and a massive hot Jupiter revealed by TESS around early-type stars
- NGTS-19b : A high mass transiting brown dwarf in a 17-day eccentric orbit
- Improved radius determinations for the transiting brown dwarf population in the era of Gaia and TESS
- An eccentric Brown Dwarf eclipsing an M dwarf
- TOI 694 b and TIC 220568520 b: Two Low-Mass Companions Near the Hydrogen Burning Mass Limit Orbiting Sun-like Stars
- Sub-stellar Companions of Intermediate-mass Stars with CoRoT: CoRoT-34b, CoRoT-35b, and CoRoT-36b
- The GAPS Programme at TNG: XXXVI. Measurement of the Rossiter-McLaughlin effect and revising the physical and orbital parameters of the HAT-P-15, HAT-P-17, HAT-P-21, HAT-P-26, HAT-P-29 eccentric planetary systems
- An Extreme-mass Ratio, Short-period Eclipsing Binary Consisting of a B Dwarf Primary and a Pre-main Sequence M Star Companion Discovered by KELT
- The OATMEAL Survey. I. Low Stellar Obliquity in the Transiting Brown Dwarf System GPX-1
- Discovery of a massive giant planet with extreme density around a sub-giant star TOI-4603
- Efficient and precise transit light curves for rapidly-rotating, oblate stars
- The First Spin-Orbit Obliquity of an M dwarf/brown dwarf System: An eccentric and aligned TOI-2119 b
- Greening of the Brown Dwarf Desert. EPIC 212036875 b -- a 51 M object in a 5 day orbit around an F7 V star
- Spinning up a Daze: TESS Uncovers a Hot Jupiter orbiting the Rapid-Rotator TOI-778
- TOI-2005b: An Eccentric Warm Jupiter in Spin-Orbit Alignment
- A New Brown Dwarf Orbiting an M star and An Investigation on the Eccentricity Distribution of Transiting Long-Period Brown Dwarfs
- The OATMEAL Survey. III. An Aligned Transiting Warm Brown Dwarf and Evidence for Quiescent Brown Dwarf Migration
- Are Am stars and hot-Jupiter planets related?
- True spin-orbit obliquities distribution: data-driven confirmation of no clustering of misaligned planets
- The Sonora Brown Dwarf Atmosphere and Evolution Models I. Model Description and Application to Cloudless Atmospheres in Rainout Chemical Equilibrium
- BD-14 3065b (TOI-4987b): from giant planet to brown dwarf: evidence for deuterium burning in old age?
- Magnetic field strengths of hot giant exoplanets consistent with Solar System values
- Uncovering the Rapidly Evolving Orbits of the Dynamic TOI-201 System
- Discovery of a young low-mass brown dwarf transiting a fast-rotating F-type star by the Galactic Plane eXoplanet (GPX) survey
- Evidence of Radius Inflation Based on 50 Transiting Brown Dwarfs and Low-mass Stellar Companions
- TOI-1518b: A Misaligned Ultra-hot Jupiter with Iron in its Atmosphere