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| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Taurus[1] |
| 2MASS J04414489+2301513 (2M J044144 B) | |
| Right ascension | 04h 41m 44.898s[2] |
| Declination | +23° 01′ 51.39″[2] |
| 2MASS J04414565+2301580 (2M J044145 A) | |
| Right ascension | 04h 41m 45.652s[2] |
| Declination | +23° 01′ 58.07″[2] |
| Apparent magnitude (V) | 15.20[3] |
| Characteristics | |
| Spectral type | M4.5[4]/M8.5[5] |
| Variable type | T Tau[6] |
| Astrometry | |
| 2MASS J04414489+2301513 (2M 044144) | |
| Proper motion (μ) | RA: 7.918[7] mas/yr Dec.: -20.152[7] mas/yr |
| Parallax (π) | 8.1822±0.3044 mas[7] |
| Distance | 400 ± 10 ly (122 ± 5 pc) |
| 2MASS J04414565+2301580 (2M 044145) | |
| Proper motion (μ) | RA: 7.914[8] mas/yr Dec.: -22.086[8] mas/yr |
| Parallax (π) | 8.0887±0.0713 mas[8] |
| Distance | 403 ± 4 ly (124 ± 1 pc) |
| Details[4] | |
| Aa | |
| Mass | 0.2+0.1 −0.05 M☉ |
| Radius | 1.1±0.2 R☉ |
| Luminosity | 0.138+0.026 −0.032 L☉ |
| Temperature | 3400 K |
| Ab | |
| Mass | 35±5 MJup |
| Radius | 3.60[a] RJup |
| Luminosity | 7.41+1.41 −1.71 × 10-3 L☉ |
| Temperature | 2800 K |
| Ba | |
| Mass | 19±3 MJup |
| Radius | 4.34[a] RJup |
| Luminosity | 3.47+0.65 −0.80 × 10-3 L☉ |
| Temperature | 2100 K |
| Bb | |
| Mass | 9.8±1.8 MJup |
| Radius | 3.05[a] RJup |
| Luminosity | 9.33+1.75 −2.15 × 10-4 L☉ |
| Temperature | 1800 K |
| Other designations | |
| WDS J04417+2302AB | |
| 2MASS J04414565+2301580: ATO J070.4402+23.0326, TIC 118893901, UCAC2 39972132, UCAC4 566-011236, UGCS J044145.65+230158.0, WISE J044145.65+230157.8, WISEA J044145.65+230157.7, Gaia DR3 146487560507840768, Gaia DR2 146487560507840768 | |
| 2MASS J04414489+2301513: Gaia DR3 146487556211644544, Gaia DR2 146487556211644544, UGCS J044144.89+230151.3, USNO-B1.0 1130-00071517, TIC 118893899 | |
| Database references | |
| SIMBAD | 2M J044144 |
| 2M J044145 | |
2MASS J0441+2301 (abbreviated as 2M 0441+23) is a young quadruple system hosting a planetary-mass object, a red dwarf star and two brown dwarfs, approximately 470 light years (145 parsecs) away.
The 2MASS J04414489+2301513 Bab (abbreviated as 2M J044144) primary (a brown dwarf) has a large separation (12.4 arcseconds) companion, 2MASS J04414565+2301580 Aab (abbreviated as 2M J044145), which in turn has a nearby small separation substellar companion (separation of 0.23 arcseconds to the northeast). 2M J044145 has similar proper motion to 2M J044144 and is likely physically associated with the system.[9] The entire system of 4 objects is then a hierarchical quadruple of two binary objects orbiting each other.[9] The primary component Aa has a spectral type of M4.5 and a red apparent magnitude of 14.2.[4] Both components seem to be accreting mass from their stellar disks, as shown by their emission lines.[4] The four objects have a total mass of only 26% of the Sun, making it the quadruple star system with the lowest mass known.[4]
Planetary system
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The primary is orbited by a companion about 5–10 times the mass of Jupiter.[10] The mass of the primary brown dwarf is roughly 20 times the mass of Jupiter and its age is roughly one million years.[5] 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 and must have formed within 1 million years or so, apparently too big and too fast to form like a regular planet from a disk around the central object.[5] It also fails the mass ratio criterion of the IAU definition of an exoplanet; the mass ratio with the primary is closer than 1/25.[11] Nevertheless, it is still considered a planet by the NASA Exoplanet Archive and Extrasolar Planets Encyclopaedia.[12][13]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (years) |
Eccentricity | Inclination (°) |
Radius |
|---|---|---|---|---|---|---|
| b | 9.8±1.8 MJ | 15±0.6 | 411 | — | — | 3.05 RJ |
See also
[edit]Notes
[edit]- 1 2 3 Based on the estimated temperature and luminosity via the Stefan-Boltzmann law.
References
[edit]- ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
- 1 2 3 4 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.
- ↑ Zacharias, N. (2012). "The fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". VizieR On-line Data Catalog. 1322. Bibcode:2012yCat.1322....0Z.
- 1 2 3 4 5 6 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:1509.01658. Bibcode:2015ApJ...811L..30B. doi:10.1088/2041-8205/811/2/L30. S2CID 22608263.
- 1 2 3 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 (1): L84–L88. arXiv:1004.0539. Bibcode:2010ApJ...714L..84T. doi:10.1088/2041-8205/714/1/L84. S2CID 119242529.
- ↑ Furlan, E.; Luhman, K. L.; Espaillat, C.; D'Alessio, P.; Adame, L.; Manoj, P.; Kim, K. H.; Watson, Dan M.; Forrest, W. J.; McClure, M. K.; Calvet, N.; Sargent, B. A.; Green, J. D.; Fischer, W. J. (2011-07-01). "THE SPITZER INFRARED SPECTROGRAPH SURVEY OF T TAURI STARS IN TAURUS". The Astrophysical Journal Supplement Series. 195 (1): 3. Bibcode:2011ApJS..195....3F. doi:10.1088/0067-0049/195/1/3. ISSN 0067-0049.
- 1 2 3 Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- 1 2 3 Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- 1 2 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 (1): 40. arXiv:1404.0213. Bibcode:2014ApJ...788...40T. doi:10.1088/0004-637X/788/1/40. S2CID 16636388.
- ↑ "Hubble spots giant planet orbiting tiny star". USA Today. 2010-04-07. Retrieved 2013-02-24.
- ↑ Lecavelier des Etangs, A.; Lissauer, Jack J. (June 2022). "The IAU working definition of an exoplanet". New Astronomy Reviews. 94 101641. arXiv:2203.09520. Bibcode:2022NewAR..9401641L. doi:10.1016/j.newar.2022.101641. IAU website link
- ↑ "2MASS J04414489+2301513 Overview". NASA Exoplanet Archive.
- ↑ "The Extrasolar Planet Encyclopaedia — 2MASS J0441+2301 Bb". Encyclopaedia of Exoplanetary Systems. Paris Observatory.
- Jean Schneider (2011). "Notes for star 2M J044144". Extrasolar Planets Encyclopaedia. Archived from the original on 19 January 2012. Retrieved 30 September 2011.
