We report the discovery of MASCARA-1 b, the first exoplanet discovered with the Multi-site All-Sky CAmeRA (MASCARA). It is a hot Jupiter orbiting a bright mV=8.3, rapidly rotating (vsini⋆>100kms−1) A8 star with a period of 2.148780±8×10−6days. The planet has a mass and radius of 3.7±0.9MJup and 1.5±0.3RJup, respectively. As with most hot Jupiters transiting early-type stars we find a misalignment between the planet orbital axis and the stellar spin axis, which may be signature of the formation and migration histories of this family of planets. MASCARA-1 b has a mean density of 1.5±0.9gcm−3 and an equilibrium temperature of 2570−30+50K, one of the highest temperatures known for a hot Jupiter to date. The system is reminiscent of WASP-33, but the host star lacks apparent delta-scuti variations, making the planet an ideal target for atmospheric characterization. We expect this to be the first of a series of hot Jupiters transiting bright early-type stars that will be discovered by MASCARA.
@article{arxiv.1707.04262,
title = {MASCARA-1 b: A hot Jupiter transiting a bright $m_V=8.3$ A-star in a misaligned orbit},
author = {G. J. J. Talens and S. Albrecht and J. F. P. Spronck and A. -L. Lesage and G. P. P. L. Otten and R. Stuik and V. Van Eylen and H. Van Winckel and D. Pollacco and J. McCormac and F. Grundahl and M. Fredslund Andersen and V. Antoci and I. A. G Snellen},
journal= {arXiv preprint arXiv:1707.04262},
year = {2018}
}
Comments
7 pages, 5 figures, Published in A&A. A typo in the value of the spectroscopic impact parameter was corrected