L1551 IRS 5


L1551 IRS 5
Observation data
Epoch J2000      Equinox J2000
Constellation Taurus
Right ascension 04h 31m 34.077s[1]
Declination 18° 08′ 04.90″[1]
Spectral type K3V/M3III[2]
Distance450 ly
(140[3] pc)
Mass0.68[3] M
Radius4[3] R
Luminosity4.2[3] L
Mass0.13[3] M
Other designations
L551 IRS 5, 2MASS J04313407+1808049, IRAS 04287+1801, WISE J043134.12+180804.9
Database references

L1551 IRS 5 is a protostellar envelope surrounding a binary protostar system in the constellation of Taurus 450 light-years from Earth. The binary system itself is known as L1551 NE,[4] and each star is surrounded by protoplanetary disk.[5] The system is one of Jim Kaler's The 100 greatest stars.[6]

The binary is surrounded by a complex, gas-rich protoplanetary disk system.[5]

The L1551 NE planetary system[5]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
North protoplanetary disk 13.3±3.5 AU 35±14°
South protoplanetary disk 14.0±5.0 AU 45±15°
Circumbinary protoplanetary disk 141.9±7.4 AU 61.5±1.7°


  1. ^ a b Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues. 2246: II/246. Bibcode:2003yCat.2246....0C.
  2. ^ Gramajo, Luciana V.; Rodón, Javier A.; Gómez, Mercedes (2014). "Spectral Energy Distribution Analysis of Class I and Class II FU Orionis Stars". The Astronomical Journal. 147 (6): 140. arXiv:1402.3240. Bibcode:2014AJ....147..140G. doi:10.1088/0004-6256/147/6/140.
  3. ^ a b c d e Takakuwa, Shigehisa; Saigo, Kazuya; Matsumoto, Tomoaki; Saito, Masao; Lim, Jeremy; Hanawa, Tomoyuki; Yen, Hsi-Wei; Ho, Paul T. P. (2017). "Spiral Arms, Infall, and Misalignment of the Circumbinary Disk from the Circumstellar Disks in the Protostellar Binary System L1551 NE". The Astrophysical Journal. 837 (1): 86. arXiv:1702.05562. Bibcode:2017ApJ...837...86T. doi:10.3847/1538-4357/aa6116. S2CID 119186924.
  4. ^ Takakuwa, Shigehisa; Kiyokane, Kazuhiro; Saigo, Kazuya; Saito, Masao (2015). "Dispersing Envelope around the Keplerian Circumbinary Disk in L1551 NE and Its Implications for Binary Growth". The Astrophysical Journal. 814 (2): 160. arXiv:1510.08353. Bibcode:2015ApJ...814..160T. doi:10.1088/0004-637X/814/2/160. S2CID 119258719.
  5. ^ a b c Cruz-Sáenz De Miera, Fernando; Kóspál, Ágnes; Ábrahám, Péter; Liu, Hauyu Baobab; Takami, Michihiro (2019), "Resolved ALMA Continuum Image of the Circumbinary Ring and Circumstellar Disks in the L1551 IRS 5 System", The Astrophysical Journal, 882 (1): L4, arXiv:1908.04649, Bibcode:2019ApJ...882L...4C, doi:10.3847/2041-8213/ab39ea, S2CID 199552023
  6. ^ "The 100 Greatest Stars".

External links

  • L1551 IRS 5: A curious case of a young and active binary star