ExoAtmospheres
IAC community database for exoplanet atmospheric observations
AU Mic b
| Planet status | Confirmed |
|---|---|
| Planet type | Warm Neptune |
| Period | 8.463446 d |
| Mass | 0.028 MJ 8.8984 M⊕ |
| Radius | 0.4273 RJ 4.78576 R⊕ |
| Semi major axis | 0.07 AU |
| Star name | AU Mic |
| Star distance | 9.79 pc |
| Star teff | 3700 K |
| Star radius | 0.75 R☉ |
| Temperature (calculated) | 569 K |
| V | 8.6 mag |
| J | 5.436 mag |
| K | 4.529 mag |
| Alternate names | |
| Exoplanet Encyclopaedia |  |
Molecules
Featureless spectra: Detection
|
HST WFC3 | The HST/WFC3 Transmission Spectrum of AU Mic b Part I: An Atmosphere Obscured by Contamination and Systematics2026, William C. Waalkes, Peter Gao et al. |
TLS effect dominates over atmospheric features |
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 observations does not show molecular signals |
Dayside Temperature (occultation): 1031 K |
Spitzer | Thermal Eclipse Observation of the Young Hot Neptune AU Mic b with Spitzer2026, Kevin I. Collins, Peter Plavchan et al. |
|
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. |
|
C+: Upper limit Si+: Upper limit
|
HST-COS | HST Far-ultraviolet Transit Observations of Two Neptune Progenitors Younger than 30 Myr2024, Feinstein, Adina D., France, Kevin et al. |
Upper limits for C II, C III, Si II, Si III |
H: Upper limit
|
HST STIS | The Variable Detection of Atmospheric Escape around the young, Hot Neptune AU Mic b2023, Keighley E. Rockcliffe, Elisabeth R. Newton et al. |
Lyα absorption in one visit, although another visit does not show evidence of absorption. |
He: Upper limit
|
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 <0.26% with SPIRou |
H: No detection
|
G-B: High resolution visible | Transmission spectroscopy and Rossiter-McLaughlin measurements of the young Neptune orbiting AU Mic2020, Palle, E., Oshagh, M. et al. |
Stellar activity prevents the detection of atoms/molecules via transmission spectra or cross-correlation. |
He: Upper limit
|
G-B: High resolution IR | Limits on the Spin-Orbit Angle and Atmospheric Escape for the 22 Myr-old Planet AU Mic b2020, Teruyuki Hirano, Vigneshwaran Krishnamurthy et al. |
Upper limit to the equivalent width of 3.7 mA at 99% confidence. |