L1551 IRS 5

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
Distance450 ly
(140[3] pc)
Details
A
Mass0.68[3] M☉
Radius4[3] R☉
Luminosity4.2[3] L☉
B
Mass0.13[3] M☉
Other designations
L551 IRS 5, 2MASS J04313407+1808049, IRAS 04287+1801, WISE J043134.12+180804.9
Database references
SIMBADdata

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]
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° —
  1. ^ a b Cite error: The named reference 2mass was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference gramajo was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference takakuwa2017 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference takakuwa2015 was invoked but never defined (see the help page).
  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".