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  • 21 Aug, 2019

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BP Tauri
BP Tauri is a young T Tauri star in the constellation of Taurus about 416 light years away, belonging to the Taurus Molecular Cloud.

Properties

BP Tauri is still accreting mass at the low rate of 9×10 M☉ and 1.6×10 M☉/year, as evidenced by X-rays produced by infalling matter, and may be still in the process of spin-up. Its chromospheric magnetic fields are rather strong at 2.5
−0.16 kilogauss, and contains strong non-dipole components. The star is producing 40% of its luminosity via the energy released by accretion.

Suspected companions

There were two suspected stellar companions to BP Tauri on projected separations 3.00 and 5.45 arcseconds. These were proven to be a background stars not related to BP Tauri with Gaia data though.

Protoplanetary system

The star is surrounded by a protoplanetary disk. The disk is strongly depleted in carbon and carbon monoxide.

The planetary system
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
protoplanetary disk 0–120 AU 30° —

Variability

BP Tauri varies in brightness, producing a strong flares due to unsteady accretion held by stellar magnetic field. The lightcurve period is variable from 6.1 to 7.6 days, and quiescent periods without variability are also known.

References

  1. ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 8 December 2021.
  2. ^ "V* BP Tau". SIMBAD. Centre de données astronomiques de Strasbourg.
  3. ^ 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.
  4. ^ Simon, M.; Dutrey, A.; Guilloteau, S. (2000), "Dynamical Masses of T Tauri Stars and Calibration of Pre–Main-Sequence Evolution", The Astrophysical Journal, 545 (2): 1034–1043, arXiv:astro-ph/0008370, Bibcode:2000ApJ...545.1034S, doi:10.1086/317838, S2CID 18064837
  5. ^ Errico, L.; Lamzin, S. A.; Vittone, A. A. (2001), "UV spectra of T Tauri stars from the HST and IUE satellites: BP Tau", Astronomy & Astrophysics, 377 (2): 557–565, Bibcode:2001A&A...377..557E, doi:10.1051/0004-6361:20011108
  6. ^ Flores, C.; Connelley, M. S.; Reipurth, B.; Boogert, A. (2019), "Measuring the Magnetic Field of Young Stars Using iSHELL Observations: BP Tau and V347 Aur", The Astrophysical Journal, 882 (2): 75, arXiv:1908.08583, Bibcode:2019ApJ...882...75F, doi:10.3847/1538-4357/ab35d4, S2CID 201645503
  7. ^ Long, M.; Romanova, M. M.; Kulkarni, A. K.; Donati, J.-F. (2010), "Global 3D simulations of disc accretion on to the classical T Tauri star BP Tauri", Monthly Notices of the Royal Astronomical Society, 413 (2): 1061–1071, arXiv:1009.3300, doi:10.1111/j.1365-2966.2010.18193.x, S2CID 55134816
  8. ^ Schmitt, J. H. M. M.; Robrade, J.; Ness, J.-U.; Favata, F.; Stelzer, B. (2005), "X-rays from accretion shocks in T Tauri stars: The case of BP Tau", Astronomy & Astrophysics, 432 (2): L35–L38, arXiv:astro-ph/0503144, Bibcode:2005A&A...432L..35S, doi:10.1051/0004-6361:200500014, S2CID 2457531
  9. ^ Ireland, Lewis G.; Zanni, Claudio; Matt, Sean P.; Pantolmos, George (2020), "Magnetic Braking of Accreting T Tauri Stars: Effects of Mass Accretion Rate, Rotation, and Dipolar Field Strength", The Astrophysical Journal, 906: 4, arXiv:2011.01087, doi:10.3847/1538-4357/abc828, S2CID 226236865
  10. ^ Long, Min; Romanova, Marina M.; Lamb, Frederick K. (2009), "Accretion onto stars with octupole magnetic fields: Matter flow, hot spots and phase shifts", New Astronomy, 17 (2): 232–245, arXiv:0911.5455, Bibcode:2012NewA...17..232L, doi:10.1016/j.newast.2011.08.001, S2CID 119113916
  11. ^ 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.
  12. ^ 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.
  13. ^ 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.
  14. ^ Kama, M.; Bruderer, S.; Carney, M.; Hogerheijde, M.; Van Dishoeck, E. F.; Fedele, D.; Baryshev, A.; Boland, W.; Güsten, R.; Aikutalp, A.; Choi, Y.; Endo, A.; Frieswijk, W.; Karska, A.; Klaassen, P.; Koumpia, E.; Kristensen, L.; Leurini, S.; Nagy, Z.; Perez Beaupuits, J. -P.; Risacher, C.; Van Der Marel, N.; Van Kempen, T. A.; Van Weeren, R. J.; Wyrowski, F.; Yıldız, U. A. (2016). "Observations and modelling of CO and [C I] in protoplanetary disks. First detections of [C I] and constraints on the carbon abundance". Astronomy and Astrophysics. 588: 588. arXiv:1601.01449. Bibcode:2016A&A...588A.108K. doi:10.1051/0004-6361/201526791. S2CID 53941444.
  15. ^ Dutrey, A.; Guilloteau, S.; Simon, M. (2003). "The BP Tau disk: A missing link between Class II and III objects?". Astronomy and Astrophysics. 402 (3): 1003. Bibcode:2003A&A...402.1003D. doi:10.1051/0004-6361:20030317.
  16. ^ Simon, Theodore; Vrba, Frederick J.; Herbst, William (1990). "The Ultraviolet and Visible Light Variability of BP Tauri: Possible Clues for the Origin of T Tauri Star Activity". The Astronomical Journal. 100: 1957. Bibcode:1990AJ....100.1957S. doi:10.1086/115651.
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