ExoAtmospheres
IAC community database for exoplanet atmospheric observations
GJ 3470 b
| Planet status | Confirmed |
|---|---|
| Planet type | Warm Neptune |
| Period | 3.336649 d |
| Mass | 0.0437 MJ 13.88786 M⊕ |
| Radius | 0.3883 RJ 4.34896 R⊕ |
| Semi major axis | 0.03557 AU |
| Star name | GJ 3470 |
| Star distance | 30.7 pc |
| Star teff | 3652 K |
| Star radius | 0.48 R☉ |
| Temperature (calculated) | 590 K |
| V | 12.3 mag |
| J | 8.794 mag |
| K | 7.989 mag |
| Alternate names | |
| Exoplanet Encyclopaedia |  |
Molecules
Featureless spectra: Detection
|
G-B: High resolution IR | Searching for Molecular Signatures in 14 Transiting Exoplanets with SPIRou2026, A. Masson, S. Vinatier et al. |
SPIRou cross-correlation tentatively detect the planet atmosphere |
He: Upper limit
|
G-B: High resolution IR | Probing atmospheric escape through metastable He I triplet lines in 15 exoplanets observed with SPIRou2024, A. Masson, S. Vinatier et al. |
Tentative detection |
H2O: Detection CO: Detection CH4: Detection SO2: Detection
|
JWST-NIRCam | Sulfur Dioxide and Other Molecular Species in the Atmosphere of the Sub-Neptune GJ 3470 b2024, Thomas G. Beatty, Luis Welbanks et al. |
|
H2O: Upper limit
|
G-B: High resolution IR | Constraints on atmospheric water abundance and cloud deck pressure in the warm Neptune GJ 3470 b via CARMENES transmission spectroscopy2024, Spandan Dash, Matteo Brogi et al. |
No evidence of water in the CARMENES dataset |
He: Detection
|
G-B: High resolution IR | LV: A HeI survey of close-in giant planets hosted by M-K dwarf stars with GIANO-B2024, G. Guilluy, M. C. D'Arpa et al. |
Detection of He absorption (1.75±0.39%) and evidence of variability with GIANO-B |
He: No detection
|
G-B: High resolution IR | Homogeneous search for helium in the atmosphere of 11 gas giant exoplanets with SPIRou2023, R. Allart, P. -B. Lemée-Joliecoeur et al. |
3sigma upper limit of <0.63% with SPIRou, not fully consistent with previous detections. |
He: Detection
|
G-B: High resolution IR | A He I upper atmosphere around the warm Neptune GJ 3470b2020, E. Palle, L. Nortmann et al. |
|
He: Detection
|
G-B: High resolution IR | 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 Finder2019, Joe P. Ninan, Gudmundur Stefansson et al. |
With the Habitable-zone Planet Finder (HPF) spectrograph |
H: Detection
|
HST STIS | Hubble PanCET: An extended upper atmosphere of neutral hydrogen around the warm Neptune GJ 3470 b2018, V. Bourrier, A. Lecavelier des Etangs et al. |
Ly-alpha detection in three transits |
Rayleigh Scattering: Detection
|
G-B: Low resolution visible | The blue sky of GJ3470b: the atmosphere of a low-mass planet unveiled by ground-based photometry2013, Nascimbeni, V., Piotto, G. et al. |