L1551 IRS 5

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]

L1551 IRS 5

HH 154 in mid-infrared around L1551 IRS 5 (bright red star in the middle) and L1551 NE (less bright red star to the left) Credit: NASA Spitzer Space Telescope
Observation data Epoch J2000      Equinox J2000
Constellation	Taurus
Right ascension	04h 31m 34.077s[1]
Declination	18° 08′ 04.90″[1]
Characteristics
Spectral type	K3V/M3III[2]
Astrometry
Distance	450 ly (140[3] pc)
Details
A
Mass	0.68[3] M☉
Radius	4[3] R☉
Luminosity	4.2[3] L☉
B
Mass	0.13[3] M☉
Other designations
L551 IRS 5, 2MASS J04313407+1808049, IRAS 04287+1801, WISE J043134.12+180804.9 EPIC 210683818
Database references
SIMBAD	data

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

A Kepler light curve for L1551 IRS 5, adapted from Cody et al. (2022)^[7]

The L1551 NE planetary system^[5]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	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°	—

References

1. 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. S2CID 121971148.
3. 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. 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".
7. Cody, Ann Marie; Hillenbrand, Lynne A.; Rebull, Luisa M. (May 2022). "The Many-faceted Light Curves of Young Disk-bearing Stars in Taurus as Seen by K2". The Astronomical Journal. 153 (5): 212. arXiv:2204.06646. Bibcode:2022AJ....163..212C. doi:10.3847/1538-3881/ac5b73.

External links

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