A ~5 M_earth Super-Earth Orbiting GJ 436?: The Power of Near-Grazing Transits
arXiv:0801.3230 · doi:10.1086/587961
Abstract
Most of the presently identified exoplanets have masses similar to that of Jupiter and therefore are assumed to be gaseous objects. With the ever-increasing interest in discovering lower-mass planets, several of the so-called super-Earths (1 M_earth<M<10 M_earth), which are predicted to be rocky, have already been found. Here we report the possible discovery of a planet around the M-type star GJ 436 with a minimum mass of 4.7+/-0.6 M_earth and a true mass of ~5 M_earth, which would make it the least massive planet around a main-sequence star found to date. The planet is identified from its perturbations on an inner Neptune-mass transiting planet (GJ 436b), by pumping eccentricity and producing variations in the orbital inclination. Analysis of published radial velocity measurements indeed reveals a significant signal corresponding to an orbital period that is very close to the 2:1 mean motion resonance with the inner planet. The near-grazing nature of the transit makes it extremely sensitive to small changes in the inclination.
arXiv comment5 pages, 3 figures, accepted for publication in The Astrophysical Journal Letters
References in corpus (21)
- Analytic Lightcurves for Planetary Transit Searches
- Towards a Deterministic Model of Planetary Formation I: a Desert in the Mass and Semi Major Axis Distributions of Extra Solar Planets
- DHP Framework: Digital Health Passports Using Blockchain -- Use case on international tourism during the COVID-19 pandemic
- On detecting terrestrial planets with timing of giant planet transits
- Discovery of a Cool Planet of 5.5 Earth Masses Through Gravitational Microlensing
- Habitable planets around the star Gl 581?
- A Neptune-Mass Planet Orbiting the Nearby M Dwarf GJ 436
- A ~ 7.5 Earth-Mass Planet Orbiting the Nearby Star, GJ 876
- The HARPS search for southern extra-solar planets XI. Super-Earths (5 & 8 M_Earth) in a 3-planet system
- Detailed Models of super-Earths: How well can we infer bulk properties?
- Detection of transits of the nearby hot Neptune GJ 436 b
- Orbital perturbations on transiting planets: A possible method to measure stellar quadrupoles and to detect Earth-mass planets
- The HARPS search for southern extra-solar planets. X. A m sin i = 11 Mearth planet around the nearby spotted M dwarf GJ 674
- Spitzer Transit and Secondary Eclipse Photometry of GJ 436b
- Accurate Spitzer infrared radius measurement for the hot Neptune GJ 436b
- The M Dwarf GJ 436 and its Neptune-Mass Planet
- The transiting exoplanet host star GJ 436: a test of stellar evolution models in the lower main sequence, and revised planetary parameters
- Characterization of the hot Neptune GJ 436b with Spitzer and ground-based observations
- The GJ 876 Planetary System -- A Progress Report
- The change in the inclination angle of the non-eclipsing binary SS Lacertae: future eclipses
- Limits to Transits of the Neptune-mass planet orbiting Gl 581
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- The CARMENES search for exoplanets around M dwarfs. First visual-channel radial-velocity measurements and orbital parameter updates of seven M-dwarf planetary systems
- Forward and Inverse Modeling of the Emission and Transmission Spectrum of GJ 436b: Investigating Metal Enrichment, Tidal Heating, and Clouds
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- A Spitzer Transmission Spectrum for the Exoplanet GJ 436b, Evidence for Stellar Variability, and Constraints on Dayside Flux Variations
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- Determining Eccentricities of Transiting Planets: A Divide in the Mass-Period Plane
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- Limits to the planet candidate GJ 436c
- HAT-P-27b: A hot Jupiter transiting a G star on a 3 day orbit
- Transit infrared spectroscopy of the hot neptune around GJ 436 with the Hubble Space Telescope
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- Observational Consequences of the Recently Proposed Super-Earth Orbiting GJ436
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- A Hubble Space Telescope Search for a Sub-Earth-Sized Exoplanet in the GJ 436 System
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- K2-146: Discovery of Planet c, Precise Masses from Transit Timing, and Observed Precession
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- Dynamical evolution of the Gliese 436 planetary system - Kozai migration as a potential source for Gliese 436b's eccentricity
- High Cadence Near Infrared Timing Observations of Extrasolar Planets: I. GJ 436b and XO-1b
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- Long-Term Evolution in Transit Duration of Extrasolar Planets from Magnetic Activity in their Parent Stars
- Eccentricity modulation of a close-in planet by a companion - application to GJ 436 system
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- Formation and tidal evolution of hot super-Earths in multiple planetary systems
- What to Expect from Transiting Multiplanet Systems
- The case for a close-in perturber to GJ 436 b
- A large sub-Neptune transiting the thick-disk M4V TOI-2406