Planet HAT-P-18 b

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

Star

HAT-P-18
Name HAT-P-18
Distance 166.0 (± 9.0) pc
Spectral type K
Apparent magnitude V 12.76
Mass 0.77 (± 0.031) MSun
Age 12.4 ( -6.4 +6.4 ) Gyr
Effective temperature 4870.0 (± 50.0) K
Radius 0.717 (± 0.026) RSun
Metallicity [Fe/H] 0.1 (± 8.0)
Detected Disc
Magnetic Field
RA2000 17:05:24.0
Dec2000 +33:00:45
Alternate Names
Planetary system 1 planet

Remarks

Alias GSC 2594-00646
Alias 2MASS 17052315+3300450

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
H2O Measurements Detected 2018 - TSIARAS A.
He Measurements Detected 2021 - PARAGAS K.

Observability Predictor


Related publications

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