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

RY Tauri

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RY Tauri

Nebula around RY Tauri observed with Gemini
Observation data
Epoch J2000      Equinox J2000
Constellation Taurus[1]
Right ascension 04h 21m 57.4133s[2]
Declination +28° 26′ 35.5340″[2]
Apparent magnitude (V) 9.5 - 11.5[3]
Characteristics
Evolutionary stage pre-main-sequence star
Spectral type F7[4]
Apparent magnitude (G) 10.706[5]
Variable type T Tau[6]
Astrometry
Radial velocity (Rv)24.3±1.9 km/s
Proper motion (μ) RA: 8.744[5] mas/yr
Dec.: −27.002[5] mas/yr
Parallax (π)7.2349±0.2031 mas[5]
Distance450 ± 10 ly
(138 ± 4 pc)
Absolute magnitude (MV)+2.11 (at magnitude 9.55)[3]
Position (relative to RY Tauri)[7]
Component2MASS J04215810+2826300
Angular distance10.83″
Position angle122.41°
Projected separation1500 AU
Details
Mass2.0[8] M☉
Radius3.2[8] R☉
Luminosity11.6[8] L☉
Surface gravity (log g)3.8[8] cgs
Temperature5,945[8] K
Age4.7+1.00
−0.90[3] 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.[9]

Stellar system

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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.[7] It was proven to be a background star not related to RY Tauri with Gaia data though.[10]

Protoplanetary system

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The star is surrounded by a protoplanetary disk discovered in 2006.[9] The disk is massive at 0.3M☉ and consists mostly of gas.[11] 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.[12] The jets contain detectable amounts of oxygen and sulfur.[4] A superjovian planet on a 0.2 AU orbit is suspected since 2021.[13]

The planetary system[11]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
protoplanetary disk 0.21–80 AU 65° —

Variability

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A visual band light curve for RY Tauri, shawing variability on three different time scales, adapted from Ismailov and Adygezalzade (2012),[14] Ismailov et al. (2011)[15] and Siwak et al. (2011)[16]

Henrietta Swan Leavitt's discovery that RY Tauri is a variable star was reported in 1907.[17] It is a highly (by 1.5 magnitudes)[12] obscured Orion variable, producing fluctuations of brightness as the star shines through the inhomogeneities of the inner part of the protoplanetary disk.[11] It also produces irregular brightening events with a duration of about a month and amplitude of one magnitude.[18] 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.[19]

References

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  1. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). Constellation record for this object at VizieR.
  2. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  3. ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  4. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  5. ^ a b c d Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). (Erratum: Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).). Gaia EDR3 record for this source at VizieR.
  6. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  7. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  8. ^ a b c d e Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  9. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  10. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value). (Erratum: Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).). Gaia EDR3 record for this source at VizieR.
  11. ^ a b c Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  12. ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  13. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  14. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  15. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).[permanent dead link]
  16. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  17. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  18. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  19. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
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