RY Tauri

Summary

Coordinates: Sky map 04h 21m 57.4133s, +28° 26′ 35.5340″

RY Tauri
Observation data
Epoch J2000      Equinox J2000
Constellation Taurus
Right ascension 04h 21m 57.4133s[1]
Declination +28° 26′ 35.5340″[1]
Apparent magnitude (V) 9.5 - 11.5[2]
Characteristics
Evolutionary stage pre-main-sequence star
Spectral type F7[3]
Apparent magnitude (G) 10.706[4]
Variable type T Tau[5]
Astrometry
Radial velocity (Rv)24.3±1.9 km/s
Proper motion (μ) RA: 8.744[4] mas/yr
Dec.: −27.002[4] mas/yr
Parallax (π)7.2349 ± 0.2031[4] mas
Distance450 ± 10 ly
(138 ± 4 pc)
Absolute magnitude (MV)+2.11 (at magnitude 9.55)[2]
Position (relative to RY Tauri)[6]
Component2MASS J04215810+2826300
Angular distance10.83
Position angle122.41°
Observed separation
(projected)
1500 AU
Details
Mass2.0[7] M
Radius3.2[7] R
Luminosity11.6[7] L
Surface gravity (log g)3.8[7] cgs
Temperature5,945[7] K
Age4.7+1.00
−0.90
[2] Myr
Other designations
BD+28 645, Gaia DR2 164551162164119424, HD 283571, HIP 20387, TYC 1828-129-1, GSC 01828-00129, 2MASS J04215740+2826355
Database references
SIMBADdata

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.[8]

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.[6] It was proven to be a background star not related to RY Tauri with Gaia data though.[9]

Protoplanetary system

The star is surrounded by a protoplanetary disk discovered in 2006.[8] The disk is massive at 0.3M and consists mostly of gas.[10] 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.[11] The jets contain detectable amounts of oxygen and sulfur.[3] A superjovian planet on a 0.2 AU orbit is suspected since 2021.[12]

The planetary system[10]
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)[11] obscured Orion variable, producing fluctuations of brightness as the star shines through the inhomogeneities of the inner part of the protoplanetary disk.[10] It also produces irregular brightening events with a duration of about a month and amplitude of one magnitude.[13] 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.[14]

References

  1. ^ a b "V* RY Tau". SIMBAD. Centre de données astronomiques de Strasbourg.
  2. ^ 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
  3. ^ 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
  4. ^ 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. Gaia EDR3 record for this source at VizieR.
  5. ^ 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.
  6. ^ 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, doi:10.1093/pasj/60.2.209
  7. ^ 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
  8. ^ 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
  9. ^ 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. Gaia EDR3 record for this source at VizieR.
  10. ^ 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
  11. ^ 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
  12. ^ 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
  13. ^ 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
  14. ^ 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