MASCARA-1b

MASCARA-1b

Discovery
Discovered by	MASCARA
Discovery date	17 July 2017
Orbital characteristics
Semi-major axis	0.040352 AU
Orbital period (sidereal)	2.1 d
Star	MASCARA-1
Physical characteristics
Mean radius	1.597 RJ
Mass	3.7 MJ
Temperature	3062 K

MASCARA-1b is a confirmed superjovian exoplanet, orbiting the A-type star MASCARA-1 (HD 201585).

Characteristics

MASCARA-1b is a hot Jupiter transiting its parent A-type star; its orbit is misaligned with the star's rotation. The planet was found unusually reflective for hot Jupiter with the measured geometric albedo of 0.171^+0.066
_−0.068 and dayside temperature of 3062⁺⁶⁶
₋₆₈ K.^[1] Attempts to spectroscopically characterize its composition were failing as in 2022 due to relatively high planetary surface gravity resulting in compact atmosphere.^[2]

References

1. Spi-OPS:Spitzer and CHEOPS confirm the near-polar orbit of MASCARA-1b and reveal a hint of dayside reflection, 2021, arXiv:2109.05031
2. Transmission spectroscopy of MASCARA-1b with ESPRESSO:Challenges of overlapping orbital and Doppler tracks, 2022, arXiv:2206.09443