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 |
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
Retrieval Survey of Metals in Six Ultrahot Jupiters: Trends in Chemistry, Rain-out, Ionization, and Atmospheric Dynamics
2023
GANDHI S., KESSELI A., ZHANG Y., LOUCA A., SNELLEN I. et al.
Astron. J., 165, 242
paper arxiv
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
2023
JOHNSON M., WANG J., ASNODKAR A., BONOMO A., SCOTT GAUDI B. et al.
Astron. J., 165, 157
paper arxiv
A survey of sodium absorption in ten giant exoplanets with high-resolution transmission spectroscopy
2022
LANGEVELD A. B., MADHUSUDHAN N., CABOT S. H. C.
MNRAS, 514, 5192
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., 667, A19
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., 165, 7
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
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
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
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
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
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
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
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
