Planet MASCARA-2 b/KELT-20 b

Name MASCARA-2 b/KELT-20 b
Planet Status Confirmed
Discovered in 2017
Mass 3.518 ( -3.517 +0.0 ) MJ
Mass*sin(i)
Semi-Major Axis 0.0542 ( -0.0021 +0.0014 ) AU +
Orbital Period 3.4741085 (± 1.9e-06) day +
Eccentricity
ω
Tperi
Radius 1.83 (± 0.07) RJ
Inclination 86.2 (± 0.1) deg
Update 2022-09-16
Detection Method Primary Transit
Mass Detection Method Radial Velocity
Radius Detection Method Primary Transit
Primary transit
Secondary transit
λ 0.6 (± 4.0) deg +
Impact Parameter b
Time Vr=0
Velocity Semiamplitude K
Calculated temperature 2230.0 ( -70.0 +60.0 ) K
Measured temperature
Hottest point longitude
Geometric albedo
Surface gravity log(g/gH)
Alternate Names HD 185603 b, MASCARA-2 b

Star

MASCARA-2
Name MASCARA-2
Distance
Spectral type A2
Apparent magnitude V 3.0
Mass 1.89 (± 0.06) MSun
Age 0.2 ( -0.05 +0.1 ) Gyr
Effective temperature 8980.0 ( -90.0 +130.0 ) K
Radius 1.6 (± 0.06) RSun
Metallicity [Fe/H] -0.02 (± 0.07)
Detected Disc
Magnetic Field
RA2000 19:38:39.0
Dec2000 +31:13:09
Alternate Names HD 185603
Planetary system 1 planet

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
CO Measurements Detected 2022 - FU G.
Ca+ Measurements Detected 2019 - CASASAYAS-BARRIS N.
Cr II Measurements Detected 2020 - HOEIJMAKERS H.
Fe Measurements Detected 2022 - YAN F.
Measurements Detected 2020 - HOEIJMAKERS H.
Fe I Measurements Detected 2022 - YAN F.
Measurements Detected 2022 - BORSA F.
Fe II Measurements Detected 2022 - BELLO-ARUFE A.
Measurements Detected 2022 - YAN F.
Measurements Detected 2022 - BORSA F.
Measurements Detected 2022 - BELLO-ARUFE A.
Fe+ Measurements Detected 2019 - CASASAYAS-BARRIS N.
H Measurements Detected 2019 - CASASAYAS-BARRIS N.
H2O Measurements Detected 2022 - FU G.
Mg Measurements Detected 2020 - HOEIJMAKERS H.
Na Measurements Detected 2020 - HOEIJMAKERS H.
Measurements Detected 2019 - CASASAYAS-BARRIS N.
Si Measurements Detected 2022 - CONT D.
Measurements Detected 2022 - CONT D.

Observability Predictor

Remarks

5-7-2017 : This object is simultaneously annouced as MASCARA-2 b by Talens et al. and as KELT-20 b by Lund et al.

Related publications

Silicon in the dayside atmospheres of two ultra-hot Jupiters
2022 CONT D., YAN RF., REINERS A., NORTMANN L., MOLAVERDIKHANI K. et al.
Astron. & Astrophys., 657, L2
paper   arxiv  

Detection of iron emission lines and a temperature inversion on the dayside of the ultra-hot Jupiter KELT-20b
2022 YAN F., REINERS A., PALLE E., SHULYAK D., STANGRET M. et al.
Astron. & Astrophys., 658, A7
paper   arxiv  

Characterization of exoplanetary atmospheres with SLOPpy
2022 SICILIA D., MALAVOLTA L., PINO L., SCANDARIATO G., NASCIMBENI V. et al.
Astron. & Astrophys., in press
paper   arxiv  

Unifying High- and Low-resolution Observations to Constrain the Dayside Atmosphere of KELT-20b/MASCARA-2b
2022 KASPER D., BEAN J., LINE M., SEIFAHRT A., LOTHRINGER J. et al.
Astron. J., submitted
paper  

The PEPSI-LBT Exoplanet Transit Survey (PETS). II. A Deep Search for Thermal Inversion Agents in KELT-20 b/MASCARA-2 b with Emission and Transmission Spectroscopy
2022 JOHNSON M., WANG J., ASNODKAR A., BONOMO A., SCOTT GAUDI B. et al.
Astron. J., submitted
arxiv  

The GAPS Programme at TNG XXXIII. HARPS-N detects multiple atomic species in emission from the dayside of KELT-20b
2022 BORSA F., GIACCOBE P., BONOMO A., BROGI M., PINO L. et al.
Astron. & Astrophys., 663, A141
paper   arxiv  

Exoplanet atmospheres at high resolution through a modest-size telescope. Fe II in MASCARA-2b and KELT-9b with FIES on the Nordic Optical Telescope
2022 BELLO-ARUFE A., BUCHHAVE L., MENDONÇA J., TRONSGAARD R., HENG K. et al.
Astron. & Astrophys., 662, A51
paper   arxiv  

Strong H2O and CO emission features in the spectrum of KELT-20b driven by stellar UV irradiation
2022 FU G., SING D., LOTHRINGER J., DEMING D., IH J. et al.
ApJ Lett., 925, L3
paper   arxiv

The GAPS programme at TNG XXX. Atmospheric Rossiter-McLaughlin effect and atmospheric dynamics of KELT-20b
2021 RAINER M., BORSA F., PINO L., FRUSTAGLI G., BROGI M. et al.
Astron. & Astrophys., in press
paper   arxiv

Detection of Fe I and Fe II in the atmosphere of MASCARA-2b using a cross-correlation method
2020 STANGRET M., CASASAYAS-BARRIS N., PALLE E., YAN F., SANCHEZ-LOPEZ A. & LOPEZ-PUERTAS M.
Astron. & Astrophys., 638, A26
paper   arxiv  

Searching for Thermal Inversion Agents in the Transmission Spectrum of MASCARA-2b/KELT-20b: Detection of Neutral Iron and Ionised Calcium H&K Lines
2020 NUGROHO S., GIBSON N., de MOOIJ E., WATSON Ch., KAWAHARA H. & MERRITT S.
MNRAS, in press
paper   arxiv  

High-resolution Transmission Spectroscopy of MASCARA-2 b with EXPRES
2020 HOEIJMAKERS H., CABROL S., ZHAO L., BUCHHAVE L., TRONSGAARD R. et al.
Astron. & Astrophys., 641, A120
paper  arxiv

A Search for FeH in Hot-Jupiter Atmospheres with High-Dispersion Spectroscopy
2020 KESSELI A., SNELLEN I., ALONSO-FLORIANO F., MOLLIERE P. & SERINDAG D.
Astron. J., 160, 228
paper  arxiv  

Atmospheric characterization of the ultra-hot Jupiter MASCARA-2b/KELT-20b
2019 CASASAYAS-BARRIS N., PALLE E., YAN F., CHEN G. et al.
Astron. & Astrophys., 628, A9
paper  arxiv  

The DEdicated MONitor of EXotransits and Transients (DEMONEXT): System Overview and Year One Results from a Low-Cost Robotic Telescope for Follow-Up of Exoplanetary Transits and Transients
2018 VILLANUEVA S., GAUDI S., POGGE R., EASTMAN J., STASSUN K. te al.
PASP, 130, 015001
paper  arxiv  

MASCARA-2 b: A hot Jupiter transiting a $m_V=7.6$ A-star
2018 TALENS G., JUSTENSEN A., ALBRECHT S., McCORMAC J., VAN EYLEN V. et al.
Astron. & Astrophys., 612, A57
paper  

Na I and Hα absorption features in the atmosphere of MASCARA-2b/KELT-20b
2018 CASASAYAS-BARRIS N., PALLE E., YAN F., CHEN G. et al.
Astron. & Astrophys., in press
paper  arxiv  

KELT: The Kilodegree Extremely Little Telescope, a Survey for Exoplanets Transiting Bright, Hot Stars
2018 PEPPER J., STASSUN K. & GAUDI S.
in the 'Handbook of Exoplanets,' Springer
arxiv  

KELT-20b: A giant planet with a period of P~ 3.5 days transiting the V~ 7.6 early A star HD 185603
2017 LUND M., RODRIGUEZ J., ZHOU G., SCOTT GAUDI B., STASSUN K. et al.
Astron. J., 154, 194
paper  arxiv