ExoAtmospheres
IAC community database for exoplanet atmospheric observations
WASP-18 b
| Planet status | Confirmed |
|---|---|
| Planet type | UltraHot Jupiter |
| Period | 0.9414518 d |
| Mass | 10.4296 MJ 3314.52688 M⊕ |
| Radius | 1.165 RJ 13.048 R⊕ |
| Semi major axis | 0.02047 AU |
| Star name | WASP-18 |
| Star distance | 100 pc |
| Star teff | 6400 K |
| Star radius | 1.23 R☉ |
| Temperature (calculated) | 2069 K |
| V | 9.3 mag |
| J | 8.409 mag |
| K | 8.131 mag |
| Alternate names | |
| Exoplanet Encyclopaedia |  |
Molecules
Dayside Temperature (occultation): 99999 K |
JWST-NIRISS | Horizontal and vertical exoplanet thermal structure from a JWST spectroscopic eclipse map2025, Ryan C. Challener, Megan Weiner Mansfield et al. |
Eclipse mapping |
CO: Detection Albedo: 0.027 Phase curve: Yes Dayside Temperature (occultation): 3000 K |
CHEOPS | Dark skies of the slightly eccentric WASP-18 b from its optical-to-infrared dayside emission2025, A. Deline, P. E. Cubillos et al. |
Combination of emission and phase curve observations from CHEOPS, TESS, Spitzer, and JWST |
Albedo: 0.05 Phase curve: Yes Dayside Temperature (occultation): 3130 K |
Spitzer | A Comprehensive Analysis Spitzer 4.5 $μ$m Phase Curve of Hot Jupiters2024, Lisa Dang, Taylor J. Bell et al. |
Dayside and nightside temperatures from phase curve at 4.5 um. |
CO: Detection
|
G-B: High resolution IR | CRIRES+ detection of CO emissions lines and temperature inversions on the dayside of WASP-18b and WASP-76b2023, F. Yan, L. Nortmann et al. |
|
H2O: Detection Phase curve: Yes |
JWST-NIRISS | A broadband thermal emission spectrum of the ultra-hot Jupiter WASP-18b2023, Louis-Philippe Coulombe, Björn Benneke et al. |
|
CO: Detection H2O: Detection OH: Detection
|
G-B: High resolution IR | The Roasting Marshmallows Program with IGRINS on Gemini South I: Composition and Climate of the Ultra Hot Jupiter WASP-18 b2022, Matteo Brogi, Vanessa Emeka-Okafor et al. |
Retrieval of C/O ratio |
H2O: Detection H-: Detection
|
HST WFC3 | Five key exoplanet questions answered via the analysis of 25 hot Jupiter atmospheres in eclipse2022, Quentin Changeat, Billy Edwards et al. |
|
Albedo: 0.025 |
TESS | Constraints on TESS albedos for five hot Jupiters2022, Martin Blažek, Petr Kabáth et al. |
3σ upper limit geometric albedo of 0.045 |
Phase curve: Yes |
TESS | Systematic Phase Curve Study of Known Transiting Systems from Year One of the TESS Mission2020, Wong, Ian, Shporer, Avi et al. |
Robust detections of secondary eclipse (D=339+/-21 ppm), planetary phase curve, ellipsoidal distortion, and beaming. |
Phase curve: Yes |
TESS | TESS Full Orbital Phase Curve of the WASP-18b System2019, Shporer, Avi, Wong, Ian et al. |
Upper limit on the geometric albedo in the TESS band of 0.048 (2σ) |