LkCa 15

LkCa 15 is a T Tauri star in the Taurus-Auriga Star Forming Region. These types of stars are relatively young pre-main-sequence stars that show irregular variations in brightness.[5] It has a mass that is about 97% of the Sun,[2] an effective temperature of 4370 K,[4] slightly cooler than the Sun. Its apparent magnitude is 11.91,[2] meaning it is not visible to the naked eye.

LkCa 15
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Taurus
Right ascension  04h 39m 17.796s[1]
Declination +22° 21′ 03.48″[1]
Apparent magnitude (V) +11.91[2]
Characteristics
Spectral type K5V[2]
Variable type T Tauri[1]
Astrometry
Proper motion (μ) RA: 9.4[1] mas/yr
Dec.: -13.2[1] mas/yr
Distance473[2] ly
(145[2] pc)
Details
Mass0.97 ± 0.03[2] M☉
Radius1.6[3] R☉
Luminosity1.22[4] L☉
Temperature4370[4] K
Age2[2] Myr
Other designations
V1079 Tau, GSC 01278-00193, TYC 1278-193-1[1]
Database references
SIMBADdata

LkCa 15 is surrounded by a protoplanetary disk, typical of many T Tauri stars.[5] The disk around the star is about 55 times more massive than Jupiter.[6] Small changes in the observed brightness of the disk may be due to a planetary companion; the star likely has a protoplanetary object or exoplanet orbiting it, known as LkCa 15 b[7][8] This name stems from an older survey.[9]

References
  1. "EM* LkCa 15". SIMBAD. Centre de données astronomiques de Strasbourg.
  2. "Notes on LKCA 15 b". Retrieved 26 December 2016.
  3. Espaillat, C.; d'Alessio, P.; Hernández, J.; Nagel, E.; Luhman, K. L.; Watson, D. M.; Calvet, N.; Muzerolle, J.; McClure, M. (2010). "Unveiling the Structure of Pre-Transitional Disks". The Astrophysical Journal. 717: 441. arXiv:1005.2365. Bibcode:2010ApJ...717..441E. doi:10.1088/0004-637X/717/1/441.
  4. Thalmann, C.; Mulders, G. D.; Hodapp, K.; Janson, M.; Grady, C. A.; Min, M.; De Juan Ovelar, M.; Carson, J.; Brandt, T.; Bonnefoy, M.; McElwain, M. W.; Leisenring, J.; Dominik, C.; Henning, T.; Tamura, M. (2014). "The architecture of the Lk Ca 15 transitional disk revealed by high-contrast imaging". Astronomy & Astrophysics. 566: A51. arXiv:1402.1766. Bibcode:2014A&A...566A..51T. doi:10.1051/0004-6361/201322915.
  5. "Encyclopedia of Science: T Tauri star". Retrieved 17 January 2017.
  6. Andrews, Sean M.; Williams, Jonathan P. (2005). "Circumstellar Dust Disks in Taurus‐Auriga: The Submillimeter Perspective". The Astrophysical Journal. 631 (2): 1134. arXiv:astro-ph/0506187. Bibcode:2005ApJ...631.1134A. doi:10.1086/432712.
  7. Kraus, Adam L.; Ireland, Michael J. (2012). "Lk Ca 15: A YOUNG EXOPLANET CAUGHT AT FORMATION?". The Astrophysical Journal. 745: 5. arXiv:1110.3808. Bibcode:2012ApJ...745....5K. doi:10.1088/0004-637x/745/1/5.
  8. Sallum, S.; Follette, K. B.; Eisner, J. A.; Close, L. M.; Hinz, P.; Kratter, K.; Males, J.; Skemer, A.; MacIntosh, B.; Tuthill, P.; Bailey, V.; Defrère, D.; Morzinski, K.; Rodigas, T.; Spalding, E.; Vaz, A.; Weinberger, A. J. (2015). "Accreting protoplanets in the Lk Ca 15 transition disk". Nature. 527 (7578): 342. arXiv:1511.07456. Bibcode:2015Natur.527..342S. doi:10.1038/nature15761. PMID 26581290.
  9. Herbig, G. H.; Vrba, F. J.; Rydgren, A. E. (1986). "A spectroscopic survey of the Taurus-Auriga dark clouds for pre-main-sequence stars having CA II H, K emission". The Astronomical Journal. 91: 575. Bibcode:1986AJ.....91..575H. doi:10.1086/114039.


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