 A visual band light curve for RY Tauri, shawing variability on three different time scales, adapted from Ismailov and Adygezalzade (2012),[1] Ismailov et al. (2011)[2] and Siwak et al. (2011)[3] | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Taurus |
| Right ascension | 04h 21m 57.4133s[4] |
| Declination | +28° 26′ 35.5340″[4] |
| Apparent magnitude (V) | 9.5 - 11.5[5] |
| Characteristics | |
| Evolutionary stage | pre-main-sequence star |
| Spectral type | F7[6] |
| Apparent magnitude (G) | 10.706[7] |
| Variable type | T Tau[8] |
| Astrometry | |
| Radial velocity (Rv) | 24.3±1.9 km/s |
| Proper motion (μ) | RA: 8.744[7] mas/yr Dec.: −27.002[7] mas/yr |
| Parallax (π) | 7.2349 ± 0.2031 mas[7] |
| Distance | 450 ± 10 ly (138 ± 4 pc) |
| Absolute magnitude (MV) | +2.11 (at magnitude 9.55)[5] |
| Position (relative to RY Tauri)[9] | |
| Component | 2MASS J04215810+2826300 |
| Angular distance | 10.83″ |
| Position angle | 122.41° |
| Observed separation (projected) | 1500 AU |
| Details | |
| Mass | 2.0[10] M☉ |
| Radius | 3.2[10] R☉ |
| Luminosity | 11.6[10] L☉ |
| Surface gravity (log g) | 3.8[10] cgs |
| Temperature | 5,945[10] K |
| Age | 4.7+1.00 −0.90[5] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
RY Tauri is a young T Tauri star in the constellation of Taurus about 450 light years away, belonging to the Taurus Molecular Cloud. It is more massive than typical T Tauri stars, and may be an intermediate between this class and the Herbig Ae/Be star type.[11]
Stellar system
There was one suspected stellar companion to RY Tauri, a 14.81 magnitude object 2MASS J04215810+2826300 discovered in 2008 at a projected separation of 1500 AU.[9] It was proven to be a background star not related to RY Tauri with Gaia data though.[12]
Protoplanetary system
The star is surrounded by a protoplanetary disk discovered in 2006.[11] The disk is massive at 0.3M☉ and consists mostly of gas.[13] The existence of a protoplanetary disk is disputed; the signal can also be attributed to the birth envelope partially disrupted by the young star. Also, polar jets were detected.[14] The jets contain detectable amounts of oxygen and sulfur.[6] A superjovian planet on a 0.2 AU orbit is suspected since 2021.[15]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| protoplanetary disk | 0.21–80 AU | 65° | — | |||
Variability
RY Tauri varies in brightness. It is a highly (by 1.5 magnitudes)[14] obscured Orion variable, producing fluctuations of brightness as the star shines through the inhomogeneities of the inner part of the protoplanetary disk.[13] It also produces irregular brightening events with a duration of about a month and amplitude of one magnitude.[16] The light curve of RY Tauri varies by 2-3 magnitudes over a decade and by roughly one magnitude over a year. The star was gradually brightening during the 20th century, possibly changing the variability mechanism in the process.[17]
References
- ^ Ismailov, N. Z.; Adygezalzade, A. N. (February 2012). "Light Curve Analysis for RY Tau". Astronomy Reports. 56 (2): 131–137. Bibcode:2012ARep...56..131I. doi:10.1134/S1063772912020023. S2CID 255203421. Retrieved 3 April 2022.
- ^ Ismailov, N. Z.; Shustarev, P. N.; Adigezalzade, A. N.; Bahaddinova, G. R. (January 2011). "Variability of the Spectrum and Brightness of RY Tau". Astronomy Letters. 37 (11): 783–790. Bibcode:2011AstL...37..783I. doi:10.1134/S1063773711100033. S2CID 119973584. Retrieved 3 April 2022.[permanent dead link]
- ^ Siwak, Michal; Rucinski, Slavek M.; Matthews, Jaymie M.; Kuschnig, Rainer; Guenther, David B.; Moffat, Anthony F. J.; Sasselov, Dimitar; Weiss, Werner W. (August 2011). "Analysis of MOST light curves of five young stars in Taurus–Auriga and Lupus 3 star-forming regions". Monthly Notices of the Royal Astronomical Society. 415 (2): 1119–1124. arXiv:1101.5806. Bibcode:2011MNRAS.415.1119S. doi:10.1111/j.1365-2966.2011.18683.x.
- ^ a b "V* RY Tau". SIMBAD. Centre de données astronomiques de Strasbourg.
- ^ a b c Gorda, S Yu; Mkrtichian, D. E.; Fernandez, M.; Irsmambetova, T. R.; Shenavrin, V. I.; Gahm, G. F.; Djupvik, A. A.; De Albuquerque, R M G.; Babina, E. V.; Artemenko, S. A.; Gameiro, J. F.; Grankin, K. N.; Petrov, P. P. (2019), "Dynamics of wind and the dusty environments in the accreting T Tauri stars RY Tauri and SU Aurigae", Monthly Notices of the Royal Astronomical Society, 483: 132–146, arXiv:1811.08635, doi:10.1093/mnras/sty3066
- ^ a b Giannini, T.; Nisini, B.; Antoniucci, S.; Biazzo, K.; Alcalá, J.; Bacciotti, F.; Fedele, D.; Frasca, A.; Harutyunyan, A.; Munari, U.; Rigliaco, E.; Vitali, F. (2019), "GIARPS High-resolution Observations of T Tauri stars (GHOsT). I: Jet line emission", Astronomy & Astrophysics, A44: 631, arXiv:1909.10392, Bibcode:2019A&A...631A..44G, doi:10.1051/0004-6361/201936085, S2CID 202719615
- ^ a b c d Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1: B/gcvs. Bibcode:2009yCat....102025S.
- ^ a b Itoh, Yoichi; Tamura, Motohide; Hayashi, Masahiko; Oasa, Yumiko; Hayashi, Saeko S.; Fukagawa, Misato; Kudo, Tomoyuki; Mayama, Satoshi; Ishii, Miki; Pyo, Tae-Soo; Yamashita, Takuya; Morino, Junichi (2008), "Near-Infrared Spectroscopy of Faint Companions around Young Stellar Objects Associated with the Taurus Molecular Cloud", Publications of the Astronomical Society of Japan, 60 (2): 209–218, Bibcode:2008PASJ...60..209I, doi:10.1093/pasj/60.2.209, hdl:20.500.14094/90001427
- ^ a b c d e Davies, Claire L.; Kraus, Stefan; Harries, Tim J.; Monnier, John D.; Kloppenborg, Brian; Aarnio, Alicia; Baron, Fabien; Lopez, Rebeca Garcia; Millan-Gabet, Rafael; Parks, Robert; Pedretti, Ettore; Perraut, Karine; Sturmann, Judit; Sturmann, Laszlo; Ten Brummelaar, Theo A.; Touhami, Yamina (2020), "The Inner Disk of RY Tau: Evidence of Stellar Occultation by the Disk Atmosphere at the Sublimation Rim from K-band Continuum Interferometry", The Astrophysical Journal, 897 (1): 31, arXiv:2005.06932, Bibcode:2020ApJ...897...31D, doi:10.3847/1538-4357/ab93c1, S2CID 218628839
- ^ a b Monnier, J. D.; Berger, J.-P.; Millan-Gabet, R.; Traub, W. A.; Schloerb, F. P.; Pedretti, E.; Benisty, M.; Carleton, N. P.; Haguenauer, P.; Kern, P.; Labeye, P.; Lacasse, M. G.; Malbet, F.; Perraut, K.; Pearlman, M.; Zhao, M. (2006), "Few Skewed Disks Found in First Closure-Phase Survey of Herbig Ae/Be stars", The Astrophysical Journal, 647 (1): 444–463, arXiv:astro-ph/0606052, Bibcode:2006ApJ...647..444M, doi:10.1086/505340, S2CID 7357373
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ a b c Davies, Claire L.; Kraus, Stefan; Harries, Tim J.; Monnier, John D.; Kloppenborg, Brian; Aarnio, Alicia; Baron, Fabien; Lopez, Rebeca Garcia; Millan-Gabet, Rafael; Parks, Robert; Pedretti, Ettore; Perraut, Karine; Sturmann, Judit; Sturmann, Laszlo; Ten Brummelaar, Theo A.; Touhami, Yamina (2020), "The inner disk of RY Tau: evidence of stellar occultation by the disk atmosphere at the sublimation rim from K-band continuum interferometry", The Astrophysical Journal, 897 (1): 31, arXiv:2005.06932, Bibcode:2020ApJ...897...31D, doi:10.3847/1538-4357/ab93c1, S2CID 218628839
- ^ a b Garufi, A.; et al. (2019), "The SPHERE view of the jet and the envelope of RY Tau", Astronomy & Astrophysics, 628: A68, arXiv:1906.06910, Bibcode:2019A&A...628A..68G, doi:10.1051/0004-6361/201935546, S2CID 189927976
- ^ Petrov, P. P.; Romanova, M. M.; Grankin, K. N.; Artemenko, S. A.; Babina, E. V.; Gorda, S Yu (2021), "Modulated accretion in the T Tauri star RY Tau – a stable MHD propeller or a planet at 0.2 au?", Monthly Notices of the Royal Astronomical Society, 504: 871–877, arXiv:2104.00433, doi:10.1093/mnras/stab904
- ^ Zajtseva, G.; Petrov, P.; Ilyin, I.; Duemler, R.; Tuominen, I. (1996), "RY Tauri at High Brightness", Information Bulletin on Variable Stars, 4408: 1, Bibcode:1996IBVS.4408....1Z
- ^ Beck, Tracy L.; Simon, M. (2001), "The Variability of T Tauri, RY Tauri, and RW Aurigae from 1899 to 1952", The Astronomical Journal, 122 (1): 413–417, arXiv:astro-ph/0104268, Bibcode:2001AJ....122..413B, doi:10.1086/321133, S2CID 14520286
This page was last edited on 4 January 2024, at 18:56