2MASS J04414489+2301513 is a brown dwarf with a companion about 5–10 times the mass of Jupiter.
Epoch J2000 Equinox J2000
|Right ascension||04h 41m 44.898s|
|Declination||+23° 01′ 51.39″|
|Apparent magnitude (V)|
|Right ascension||04h 41m 45.652s|
|Declination||+23° 01′ 58.07″|
|Apparent magnitude (V)||15.20|
|Distance||470 ± 50 ly
(145 ± 15 pc)
|Proper motion (μ)||RA: 5.6 mas/yr
Dec.: −22.1 mas/yr
|Mass||19 ± 3 / 9.8 ± 1.8 MJup|
|Luminosity||0.00347 / 0.00093 L☉|
|Temperature||2100 / 1800 K|
−0.05 0.20M☉ / 35 ± 5 MJup
|Luminosity||0.14 / 0.00741 L☉|
|Temperature||3400 / 2800 K|
2MASS J04414489+2301513 (often abbreviated as 2M J044144) is a young brown dwarf approximately 470 light years (145 parsecs) away with an orbiting companion about 5–10 times the mass of Jupiter. The mass of the primary brown dwarf is roughly 20 times the mass of Jupiter and its age is roughly one million years.
It is not clear whether this companion object is a sub-brown dwarf or a planet. The companion is very large with respect to its parent brown dwarf, and must have formed within 1 million years or so. This seems to be too big and too fast to form like a regular planet from a disk around the central object.
|b||7.5 ± 2.5 MJ||15 ± 0.6||2010|
2MASS J04414489+2301513 has another companion, 2MASS J04414565+2301580 (abbreviated as 2M J044145), which is another binary star. At a separation of 0.23 arcseconds to the northeast, it has a similar proper motion to 2M J044144 and is likely physically associated with the system. The primary component has a spectral type of M4.5 and a red apparent magnitude of 14.2. Both components seem to be accreting mass from their stellar disks, as shown by their emission lines. The four stars have a total mass of only 26% of the Sun, making it the quadruple star system with the lowest mass known.
- Cutri, R. M.; et al. (2003). "2MASS All-Sky Catalog of Point Sources". VizieR On-line Data Catalog. 2246. Bibcode:2003yCat.2246....0C.
- Zacharias, N. (2012). "The fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". VizieR On-line Data Catalog. 1322. Bibcode:2012yCat.1322....0Z.
- Todorov, K.; Luhman, K. L.; McLeod, K. K. (2010). "Discovery of a Planetary-Mass Companion to a Brown Dwarf in Taurus". The Astrophysical Journal. 714: L84. arXiv: . doi:10.1088/2041-8205/714/1/L84.
- Bowler, Brendan P.; Hillenbrand, Lynne A. (2015). "Near-infrared Spectroscopy of 2M0441+2301 AabBab: A Quadruple System Spanning the Stellar to Planetary Mass Regimes". The Astrophysical Journal. 811 (2): L30. arXiv: . Bibcode:2015ApJ...811L..30B. doi:10.1088/2041-8205/811/2/L30.
- "Hubble spots giant planet orbiting tiny star". USA Today. 2010-04-07. Retrieved 2013-02-24.
- Todorov, K. O.; Luhman, K. L.; Konopacky, Q. M.; McLeod, K. K.; Apai, D.; Ghez, A. M.; Pascucci, I.; Robberto, M. (2014). "A Search for Companions to Brown Dwarfs in the Taurus and Chamaeleon Star-Forming Regions". The Astrophysical Journal. 788: 40. arXiv: . Bibcode:2014ApJ...788...40T. doi:10.1088/0004-637X/788/1/40.