Planet GJ 3470 b

Name GJ 3470 b
Planet Status Confirmed
Discovered in 2012
Mass 0.03958 ( -0.00403 +0.00412 ) MJ
Mass*sin(i) +
Semi-Major Axis 0.03557 (± 0.001) AU +
Orbital Period 3.336649 ( -8.1e-05 +8.4e-05 ) day +
Eccentricity 0.114 (± 0.052) +
ω 278.0 ( -2.3 +5.7 ) deg
Tperi
Radius 0.3738074294 ( -0.0526363683404 +0.0526363683404 ) RJ +
Inclination 88.3 (± 0.5) deg
Update 2020-08-27
Detection Method Primary Transit
Mass Detection Method
Radius Detection Method Primary Transit
Primary transit 2455953.663 (± 0.0035) JD +
Secondary transit
λ
Impact Parameter b
Time Vr=0
Velocity Semiamplitude K 8.21 (± 0.47) m/s
Calculated temperature
Measured temperature
Hottest point longitude
Geometric albedo
Surface gravity log(g/gH)
Alternate Names

Star

GJ 3470
Name GJ 3470
Distance 30.7 ( -1.7 +2.1 ) pc +
Spectral type M1.5
Apparent magnitude V 12.3
Mass 0.51 (± 0.06) MSun +
Age 1.6 (± 1.3) Gyr +
Effective temperature 3652.0 (± 50.0) K +
Radius 0.48 (± 0.04) RSun +
Metallicity [Fe/H] 0.2 (± 0.1) +
Detected Disc
Magnetic Field
RA2000 07:59:06.0
Dec2000 +15:23:30
Alternate Names
Planetary system 1 planet

More data

Atmospheric parameters

Temperatures

Data Source Type Result Value Result Figure Notes Reference

Molecules

Molecule Data Source Type Result Value Result Figure Notes Reference
CO Measurements Detected 2019 - BENNEKE B.
H Measurements Detected 2018 - BOURRIER V.
Modeling 2020 - SHAIKHISLAMOV I.
H2O Measurements Detected 5σ 2019 - BENNEKE B.
He Measurements Detected 2020 - PALLE E.
Modeling 2020 - SHAIKHISLAMOV I.

Observability Predictor


Related publications

On the Temperature Profiles and Emission Spectra of Mini-Neptune Atmospheres
2020 PIETTE A. & MADHUSUDHAN N.
ApJ, accepted
arxiv

Evidence for He I 10830 Å~ absorption during the transit of a warm Neptune around the M-dwarf GJ 3470 with the Habitable-zone Planet Finder
2020 NINAN J., STEFANSON G., MAHADEVAN S., BENDER Ch.,ROBERTSON P.
ApJ., 894, 97
paper   arxiv  

Beyond Equilibrium Temperature: How the Atmosphere/Interior Connection Affects the Onset of Methane, Ammonia, and Clouds in Warm Transiting Giant Planets
2020 FORTNEY J., VISSCHER Ch., MARLEY M., HOOD C., LINE M. et al.
Astron. J., 160, 288
paper  arxiv  

Global 3D hydrodynamic modeling of absorption in Lyα and He 10830 A lines at transits of GJ3470b
2020 SHAIKHISLAMOV I., KHODACHENKO M., LAMMER H., BEREZUTSKY A., MIROSHNICHENKOI. et al.
MNRAS, in press
paper  

Colour-magnitude diagrams of transiting Exoplanets -- III. A public code, nine strange planets, and the role of Phosphine
2020 DRANSFIELD G. & TRIAUD A.
MNRAS, in press
paper  arxiv  

GJ 3470 c: A Saturn-like Exoplanet Candidate in the Habitable Zone of GJ 3470
2020 SCOTT Ph., WALTER B., YE ., MITCHELL D. HEILAND L., GAO X. et al.
arxiv  

A He I upper atmosphere around the warm Neptune GJ 3470b
2020 PALLE E., NORTMANN L., CASASAYAS-BARRIS N., LAMPON M., LOPEZ-PUERTS M. et al.
Astron. & Astrophys., 638, A61
paper   arxiv

Why do warm Neptunes present nonzero eccentricity?
2020 CORREIA A., BOURRIER V. & DELISLE J.-B.
Astron. & Astrophys., 635, A37
paper  arxiv

Dusty outflows in planetary atmospheres: Understanding "super-puffs" and transmission spectra of sub-Neptunes
2019 WANG L. & DAI F.
ApJ. Letters, accepted
arxiv  

Analyzing Eight Years of Transiting Exoplanet Observations Using WFC3's Spatial Scan Monitor
2019 STEVENSON K. & FOWLER J.
Instrument Science Report WFC3 2019-12

A Sub-Neptune Exoplanet with a Low-Metallicity Methane-Depleted Atmosphere and Mie-Scattering Clouds
2019 BENNEKE B., KNUTSON H., LOTHRINGER J., CROSSFIELD I., MOSES J. et al.
Nature Astronomy
paper  arxiv  

Impact of Space Weather on Climate and Habitability of Terrestrial Type Exoplanets
2019 AIRAPETIAN V., BARNES R., COHEN O., COLLINSON G., DANCHI W. et al.
Int. J. Astrobiol., in press
paper

Exoplanet Spectroscopy and Photometry with the Twinkle Space Telescope
2018 EDWARDS B., RICE M., ZINGALES T., TESSENYI M., WALDMANN I. et al.
MNRAS, submitted
arxiv  

Bright Opportunities for Atmospheric Characterization of Small Planets: Masses and Radii of K2-3 b, c, d and GJ3470 b from Radial Velocity Measurements and Spitzer Transits
2018 KOSIAREK M., CROSSFIELD I., HARDEGREE-ULLMAN K., LIVINGSTON J., BENNEKE B. et al.
Astron. J., accepted
arxiv  

Hubble PanCET: An extended upper atmosphere of neutral hydrogen around the warm Neptune GJ 3470 b
2018 BOURRIER V., LECAVELIER DESC ETANGS A., EHRENREICH D., SANCHEZ-FORCADA J., ALLART R. et al.
Astron. & Astrophys., 620, A147
paper   arxiv  

The GTC exoplanet transit spectroscopy survey. VI. A spectrally-resolved Rayleigh scattering slope in GJ 3470b
2017 CHEN G., GUENTHER E., PALLE E., NORTMANN L., NOWAK G. et al.
Astron. & Astrophys., 600, A138
paper  arxiv  ADS

Observing transiting planets with JWST -- Prime targets and their synthetic spectral observations
2017 MOLLIERE P., van BOEKEL R., BOUWMAN J., HENNING Th., LAGAGE P.-O. & MIN M.
Astron. & Astrophy., 600, A10
paper  arxiv  ADS

Trends in Atmospheric Properties of Neptune-Size Exoplanets
2017 CROSSFIELD I. & KREIDBERG L.
Astron. J., 154, 261
paper  arxiv  

Trigonometric Parallaxes and Proper Motions of 134 Southern Late M, L, and T Dwarfs from the Carnegie Astrometric Planet Search Program
2016 WEINBERGER A., BOSS A., KEISER S., ANGLADA-ESCUDE G., THOMPSON I. & BURLEY G.
Astron. J., 152, 24
paper  arxiv  ADS  

Marginalising instrument systematics in HST WFC3 transit lightcurves
2016 WAKEFORD H., SING D., EVANS T.,DEMING D. & MANDELL A.
ApJ, accepted
arxiv  

Energy-limited escape revised. The transition from strong planetary winds to stable thermospheres
2016 SALZ M., SCHNEIDER P., CZESLA S. & SCHMITT J.
Astron. & Astrophys., 585, L2
paper   arxiv   ADS  

Transit timing variation and transmission spectroscopy analyses of the hot Neptune GJ3470b
2016 AWIPHAN S., KERINS E., PICHADEE S., KOMONJINDA S., DHILLON V. et al.
MNRAS, 463, 2574
paper  arxiv  ADS

Rayleigh Scattering in the Atmosphere of the Warm Exo-Neptune GJ 3470b
2015 DRAGOMIR D., BENNEKE B., PEARSON K., CROSSFIELD I. et al.
ApJ, 814, 102
paper  arxiv  ADS

Using near infra-red spectroscopy for characterization of transiting exoplanets
2015 ARONSON E., WALDEN P. & PISKUNOV N.
Astron. & Astrophys., 578, A133
paper  arxiv  ADS

Exoplanetary Geophysics -- An Emerging Discipline
2015 LAUGHLIN G. & LISSAUER J.
Review Chapter in Treatise on Geophysics, accepted
arxiv  

Warm Ice Giant GJ 3470b. II Revised Planetary and Stellar Parameters from Optical to Near-infrared Transit Photometry
2014 BIDDLE L., PEARSON K., CROSSFIELD I., FULTON B., CICERI S. et al.
ApJ, submitted
arxiv  

Near-infrared transmission spectrum of the warm-uranus GJ 3470b with the Wide Field Camera-3 on the Hubble Space Telescope
2014 EHRENREICH D., BONFILS X., LOVIS Ch., DELFOSSE X., FORVEILLE Th. et al.
Astron. & Astrophys., 570, A89
paper  arxiv 

Understanding the Mass-Radius Relation for Sub-Neptunes: Radius as a Proxy for Composition
2014 LOPEZ E. & FORTNEY J.
ApJ, 792, 1
paper   arxiv   ADS  

The atmospheric chemistry of the warm Neptune GJ 3470b: influence of metallicity and temperature on the CH4/CO ratio
2014 VENOT O., AGUNDEZ M., SELSIS F., TESSENYI M. & IRO N.
Astron. & Astrophys., 562, A51
paper  arxiv 

Spitzer Observations of GJ3470b: a Very Low-density Neptune-size Planet Orbiting a Metal-rich M dwarf
2013 DEMORY B.-O., TORRES G., NEVES V., ROGERS L., GILLON M. & 11 additional authors
ApJ, submitted
arxiv  

Optical-to-Near-Infrared Simultaneous Observations for the Hot Uranus GJ3470b: A Hint for Cloud-free Atmosphere
2013 FUKUI A., NARITA N., KUROSAKI K., IKOMA M., YANAGISAWA K. & 13 additional authors
ApJ, 770, 95
paper  arxiv  

Warm Ice Giant GJ 3470b. I. A Flat Transmission Spectrum Indicates a Hazy, Low-methane, and/or Metal-rich Atmosphere
2013 CROSSFIELD I., BARMAN, T. HANSEN B. &HOWARD A.
Astron. & Astrophys., 559, A33
paper  arxiv 

The blue sky of GJ3470b: the atmosphere of a low-mass planet unveiled by ground-based photometry
2013 NASCIMBENI V., PIOTTO G., PAGANO I., SCANDARIATO G., SANI E. & FUMANA M.
Astron. & Astrophys., 559, A32
paper  arxiv 

A hot Uranus transiting the nearby M dwarf GJ3470. Detected with HARPS velocimetry. Captured in transit with TRAPPIST photometry
2012 BONFILS X., GILLON M., UDRY S., ARMSTRONG D., BOUCHY F. & 13 additional authors
Astron. & Astrophys., 546, A27
paper   arxiv