HD 36112

HD 36112

HD 36112 and the surrounding dusty disk. The rings in the disk were measured as being elliptical in shape rather than being perfectly circular.
Credit: ESO/R. Dong et al.; ALMA (ESO/NAOJ/NRAO)
Observation data
Epoch J2000      Equinox J2000
Constellation Taurus
Right ascension 05h 30m 27.52856s[1]
Declination +25° 19′ 57.0763″[1]
Characteristics
Spectral type A8Ve[2]
Astrometry
Proper motion (μ) RA: 3.685(33) mas/yr[1]
Dec.: −26.373(22) mas/yr[1]
Parallax (π)6.4157 ± 0.0314 mas[1]
Distance508 ± 2 ly
(155.9 ± 0.8 pc)
Other designations
MWC 758, BD+25 843, HIP 25793, 2MASS J05302753+2519571, IRAS 05273+2517
Database references
SIMBADdata

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.[3][4]

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.[4]

A 2018 study detected a possible exoplanet at a distance of about 20 au, designated MWC 758 b,[5] and the observations with ALMA have also shown evidence of an unseen planet at 100 au.[4] A study in 2019 came to the conclusion that a 1.5 MJ planet at 35 au and a 5 MJ planet at 140 au could explain the features seen with ALMA and the VLA.[6]

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.[7] However, another study in 2021 failed to detect either of the point sources found in earlier studies.[8] A 2023 study found further evidence for MWC 758 CC1, now designated MWC 758 c, orbiting at a distance of approximately 100 au.[9]

  1. ^ a b c d Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference vieira was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference alma was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Dong2018 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Reggiani2018 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Baruteau2019 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Wagner2019 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Boccaletti2021 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Wagner2023 was invoked but never defined (see the help page).