Name | HAT-P-18 b | ||
Planet Status | Confirmed | ||
Discovered in | 2010 | ||
Mass | 0.183 ( -0.032 +0.034 ) MJ | ![]() |
|
Mass*sin(i) | — | ||
Semi-Major Axis | 0.0559 (± 0.0007) AU | ![]() |
|
Orbital Period | 5.508029 (± 4.2e-06) day | ![]() |
+ |
Eccentricity | 0.106 ( -0.084 +0.15 ) | ![]() |
|
ω | 120.0 (± 56.0) deg | ![]() |
|
Tperi | — | ||
Radius | 0.947 ( -0.044 +0.044 ) RJ | ![]() |
|
Inclination | 88.79 (± 0.21) deg | ![]() |
+ |
Update | 2022-07-07 | ||
Detection Method | Primary Transit | ||
Mass Detection Method | — | ||
Radius Detection Method | — | ||
Primary transit | 2454715.02254 (± 0.00039) JD | ![]() |
+ |
Secondary transit | 2454717.65 (± 0.13) JD | ||
λ | 132.0 (± 15.0) deg | ![]() |
|
Impact Parameter b | 0.324 (± 0.057) | ![]() |
|
Time Vr=0 | — | ||
Velocity Semiamplitude K | — | ||
Calculated temperature | 841.0 K | ![]() |
+ |
Measured temperature | — | ||
Hottest point longitude | — | ||
Geometric albedo | — | ||
Surface gravity log(g/gH) | 2.734 | ![]() |
|
Alternate Names | HAT-18b |
Data Source | Type | Result Value | Result Figure | Notes | Reference |
Molecule | Data Source | Type | Result Value | Result Figure | Notes | Reference |
H2O | Measurements | Detected | 2018 - TSIARAS A. | |||
He | Measurements | Detected | 2021 - PARAGAS K. | |||
Towards a new era in giant exoplanet characterisation
2023
MÜLLER S. & HELLED R.
Astron. & Astrophys., 669, A24
paper arxiv
Featureless transmission spectra of 12 giant exoplanets observed by GTC/OSIRIS
2023
JIANG C., CHEN G., PALLE E., MURGAS F., PARVIAINEN H. & MA Y.
Astron. & Astrophys., in press
paper
The Sensitivity of Eclipse Mapping to Planetary Rotation
2023
ADAMS A. & RAUSCHER E.
ApJ, 165, 24
paper arxiv
The Upper Edge of the Neptune Desert Is Stable Against Photoevaporation
2022
VISSAPRAGADA Sh., KNUTSON H., GREKLEK-McKEON M., OKLOPIC A., DAI F. et al.
Astron. J., 164, 234
paper arxiv
Constraining planetary mass-loss rates by simulating Parker wind profiles with Cloudy
2022
LINSSEN D., OKLOPCIC A. & MACLEOD M.
Astron. & Astrophys., 667, A54
paper arxiv
Water and an escaping helium tail detected in the hazy and methane-depleted atmosphere of HAT-P-18b from JWST NIRISS/SOSS
2022
FU G., ESPINOZA N., SING D., LOTHRINGER J., DOS SANTOS L. et al.
ApJ. Letters, accepted
arxiv
Original Research By Young Twinkle Students (ORBYTS): Ephemeris Refinement of Transiting Exoplanets III
2021
EDWARDS B., HO C., OSBORNE H., DEEN N., HATGORN E. et al.
Astronomy Theory, Observations and Methods Journal., accepted
arxiv
Metastable Helium Reveals an Extended Atmosphere for the Gas Giant HAT-P-18b
2021
PARAGAS K., VISSAPRAGADA Sh., KNUTSON H., OKLOPCIC A., CHACHAN Y. et al.
ApJ. Lett., 909, L10
paper arxiv
Investigating Trends in Atmospheric Compositions of Cool Gas Giant Planets Using Spitzer Secondary Eclipses
2019
WALLACK N., KNUTSON H., MORLEY C., MOSES J., THOMAS N. et al.
Astron J., 158, 217
paper arxiv
A population study of hot Jupiter atmospheres
2018
TSIARAS A., WALDMANN I., ZINGALES T., ROCCHETTO M., MORELLO G. et al.
Astron. J., 155, 156
paper arxiv
Rayleigh scattering in the transmission spectrum of HAT-P-18b
2017
KIRK J., WHEATLEY P., LOUDEN T., DOYLE A., SKILLEN I. et al.
MNRAS, 468, 3907
paper arxiv ADS
Ground-based transit observations of the HAT-P-18, HAT-P-19, HAT-P-27/WASP-40 and WASP-21 systems
2015
SEELIGER M., KITZE M., EMMANN R., RICHTER S., OHLERT J. et al.
MNRAS, 451, 4060
paper arxiv
Friends of Hot Jupiters III: An Infrared Spectroscopic Search for Low-Mass Stellar Companions
2015
PISKORZ D., KNUTSON H., NGO H., MUIRHEAD Ph., BATYGIN K. et al.
ApJ, 814, 148
paper arxiv ADS
Friends of Hot Jupiters II: No Correspondence Between Hot-Jupiter Spin-Orbit Misalignment and the Incidence of Directly Imaged Stellar Companions
2015
NGO R., KNUTSON H., HINKLEY S., CREPP J., BECHLER E. et al.
ApJ, 800, 138
paper arxiv ADS
The GAPS Programme with HARPS-N at TNG. III: The retrograde orbit of HAT-P-18b
2014
ESPOSITO M., COVINO E., MANCINI L., HARUTYUNYAN A., SOUTHWORTH J. & 20 co-authors
Astron. & Astrophys., 564, L13
paper arxiv ADS
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
Friends of Hot Jupiters I: A Radial Velocity Search for Massive, Long-Period Companions to Close-In Gas Giant Planets
2014
KNUTSON H., FULTON B., MONTET B., KAO M., NGO H. & 8 additional authors
ApJ, 785, 126
paper arxiv ADS
The Mass of KOI-94d and a Relation for Planet Radius, Mass, and Incident Flux
2013
WEISS L., MARCY G., ROWE J., HOWARD A.,
ISAACSON H. & 13 additional authors
ApJ, 768, 14
paper arxiv ADS
The coronal X-ray–age relation and its implications for the evaporation of exoplanets
2012
JACKSON A., DAVIS T. & WHEATLEY P.
MNRAS, 422, 2024
paper arxiv ADS
Constraining Tidal Dissipation in Stars from The Destruction Rates of Exoplanets
2012
PENEV K., JACKSON B., SPADA F. & THOM N.
ApJ., 751, 96
paper arxiv ADS
Factors Affecting the Radii of Close-in Transiting Exoplanets
2012
ENOCH B., COLLIER CAMERON A. & HORNE K.
Astron. & Astrophys., 540, A99
paper arxiv ADS
HAT-P-18b and HAT-P-19b: Two Low-Density Saturn-Mass Planets Transiting Metal-Rich K Stars
2011
HARTMAN J., BAKOS G., SATO B., TORRES G., NOYES R. & 18 co-authors
ApJ., 726, 52
paper arxiv ADS
The Exoplanet Handbook
2011
Michael Perryman
Content
Content and Chapter 5
Mass-loss rates for transiting exoplanets
2011
EHRENREICH D. & DESERT J.-M.
Astron. & Astrophys., 529, A136
paper arxiv ADS
The Heavy Element Masses of Extrasolar Giant Planets, Revealed
2011
MILLER N. & FORTNEY J.
ApJ. Letters, 736, L29
paper arxiv ADS
Quantization of Planetary Systems and its Dependency on Stellar Rotation
2011
ZOGHBI J.-P.
Publ. Astron. Soc. Australia, 28, 177
paper arxiv ADS