HD 36112

HD 36112, also known as MWC 758, is a young Herbig Ae star located in the constellation Taurus, surrounded by irregular rings of cosmic dust. The system is about 3.5 million years old. The disk has a cavity at 50 astronomical units and two spiral arms at 30-75 au that are seen in near-infrared scattered light, but only one spiral arm is seen in ALMA images.

The inner cavity was shown to be elliptical and not perfectly circular. This is not a projection effect but represents the shape of the cavity, with an eccentricity e ≈ 0.1 after the deprojection of the disk.

A 2018 study detected a possible exoplanet at a distance of about 20 au, designated MWC 758 b, and the observations with ALMA have also shown evidence of an unseen planet at 100 au. A study in 2019 came to the conclusion that a 1.5 planet at 35 au and a 5  planet at 140 au could explain the features seen with ALMA and the VLA.

In another 2019 study, a possible exoplanet or disk feature was detected with the Large Binocular Telescope, referred to as MWC 758 CC1 (Companion Candidate 1), with a non-detection of MWC 758 b. However, another study in 2021 failed to detect either of the point sources found in earlier studies. A 2023 study found further evidence for MWC 758 CC1, now designated MWC 758 c, orbiting at a distance of approximately 100 au.