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.[3][4]

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

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]

References
  1. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. Vieira, S. L. A; Corradi, W. J. B; Alencar, S. H. P; Mendes, L. T. S; Torres, C. A. O; Quast, G. R; Guimares, M. M; Da Silva, L (2003). "Investigation of 131 Herbig Ae/Be Candidate Stars". The Astronomical Journal. 126 (6): 2971. Bibcode:2003AJ....126.2971V. doi:10.1086/379553.
  3. "ALMA spies a new planetary nursery". www.eso.org. Retrieved 2 July 2018.
  4. Dong, Ruobing; Liu, Sheng-yuan; Eisner, Josh; Andrews, Sean; Fung, Jeffrey; Zhu, Zhaohuan; Chiang, Eugene; Hashimoto, Jun; Liu, Hauyu Baobab; Casassus, Simon; Esposito, Thomas (June 2018). "The Eccentric Cavity, Triple Rings, Two-armed Spirals, and Double Clumps of the MWC 758 Disk". Astrophysical Journal. 860 (2): 124. arXiv:1805.12141. Bibcode:2018ApJ...860..124D. doi:10.3847/1538-4357/aac6cb. ISSN 0004-637X.
  5. Reggiani, M.; Christiaens, V.; et al. (March 2018). "Discovery of a point-like source and a third spiral arm in the transition disk around the Herbig Ae star MWC 758". Astronomy & Astrophysics. 611: A74. arXiv:1710.11393. Bibcode:2018A&A...611A..74R. doi:10.1051/0004-6361/201732016. S2CID 73557538.
  6. Baruteau, Clément; Barraza, Marcelo; Pérez, Sebastián; Casassus, Simon; Dong, Ruobing; Lyra, Wladimir; Marino, Sebastián; Christiaens, Valentin; Zhu, Zhaohuan; Carmona, Andrés; Debras, Florian (June 2019). "Dust traps in the protoplanetary disc MWC 758: two vortices produced by two giant planets?". MNRAS. 486 (1): 304–319. arXiv:1903.06537. Bibcode:2019MNRAS.486..304B. doi:10.1093/mnras/stz802. hdl:10150/633974. ISSN 0035-8711. S2CID 119356534.
  7. Wagner, Kevin; Stone, Jordan M.; Spalding, Eckhart; Apai, Daniel; Dong, Ruobing; Ertel, Steve; Leisenring, Jarron; Webster, Ryan (September 2019). "Thermal Infrared Imaging of MWC 758 with the Large Binocular Telescope: Planetary-driven Spiral Arms?". Astrophysical Journal. 882 (1): 20. arXiv:1907.06655. Bibcode:2019ApJ...882...20W. doi:10.3847/1538-4357/ab32ea. hdl:10150/634582. ISSN 0004-637X. S2CID 196831464.
  8. Boccaletti, A.; Pantin, E.; Ménard, F.; Galicher, R.; Langlois, M.; Benisty, M.; Gratton, R.; Chauvin, G.; Ginski, C.; Lagrange, A.-M.; Zurlo, A.; Biller, B.; Bonavita, M.; Bonnefoy, M.; Brown-Sevilla, S.; Cantalloube, F.; Desidera, S.; d'Orazi, V.; Feldt, M.; Hagelberg, J.; Lazzoni, C.; Mesa, D.; Meyer, M.; Perrot, C.; Vigan, A.; Sauvage, J.-F.; Ramos, J.; Rousset, G.; Magnard, Y. (2021). "Investigating point sources in MWC 758 with SPHERE". Astronomy & Astrophysics. 652: L8. arXiv:2107.07850. Bibcode:2021A&A...652L...8B. doi:10.1051/0004-6361/202141177. S2CID 236034288.
  9. Wagner, Kevin; Stone, Jordan; et al. (July 2023). "Direct images and spectroscopy of a giant protoplanet driving spiral arms in MWC 758". Nature Astronomy. 7 (10): 1208–1217. arXiv:2307.04021. Bibcode:2023NatAs...7.1208W. doi:10.1038/s41550-023-02028-3. S2CID 259501395.
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