TZ Arietis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aries |
| Right ascension | 02h 00m 12.959s[1] |
| Declination | +13° 03′ 07.01″[1] |
| Apparent magnitude (V) | 12.298[2] |
| Characteristics | |
| Spectral type | M4.5 V[3] |
| U−B color index | +1.37[4] |
| B−V color index | +1.80[4] |
| R−I color index | 1.39[3] |
| Variable type | Flare star |
| Astrometry | |
| Proper motion (μ) | RA: +1092.0[1] mas/yr Dec.: –1772.9[1] mas/yr |
| Parallax (π) | 223.6349 ± 0.1066 mas[5] |
| Distance | 14.584 ± 0.007 ly (4.472 ± 0.002 pc) |
| Absolute magnitude (MV) | 14.03[6] |
| Details | |
| Mass | 0.14[7] M☉ |
| Radius | 0.161[8] R☉ |
| Luminosity | 0.00135[9] L☉ |
| Surface gravity (log g) | 5.05[7] cgs |
| Temperature | 3,158[8] K |
| Metallicity [Fe/H] | −0.14[8] dex |
| Rotational velocity (v sin i) | 3.8[9] km/s |
| Age | 4.8[7] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
L 1159-16 is a red dwarf in the northern constellation of Aries. With a normal apparent visual magnitude of 12.3, it is too faint to be seen by the naked eye, although it lies relatively close to the Sun at a distance of about 14.6 light-years (4.5 parsecs). It is a flare star, which means it can suddenly increase in brightness for short periods of time.
Variability
L 1159-16 is a variable star. It is a flare star, showing brief increases in brightness due to eruptions from its surface. In the ultraviolet, flares of over a magnitude have been observed. In addition it shows longterm variations in brightness which may be due to starspots and rotation, possibly classifying it as a BY Draconis variable.[11] It was given the variable star designation TZ Arietis in 1970.[12]
Planetary system
In June 2019 three candidate planets were reported in orbit around L 1159-16 (GJ 83.1),[13] and two were confirmed in August 2020.[14]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| d (unconfirmed) | ≥4.0+1.9 −1.8 M🜨 |
0.016+0.001 −0.002 |
1.93177+0.00016 −0.00020 |
0.09+0.26 −0.09 |
— | — |
| b | ≥27.9+19 −11 M🜨 |
0.403+0.039 −0.047 |
241.590+4.6 −4.0 |
0.16+0.32 −0.16 |
— | — |
| c | ≥70.7+26.3 −21.5 M🜨 |
0.871+0.087 −0.100 |
766.954+16.710 −19.237 |
0.39+0.18 −0.32 |
— | — |
See also
References
- ^ a b c d Zacharias, N.; et al. (2003), "The Second U.S. Naval Observatory CCD Astrograph Catalog (UCAC2)", CDS/ADC Collection of Electronic Catalogues, vol. 1289, Bibcode:2003yCat.1289....0Z.
- ^ Landolt, Arlo U. (July 1992), "UBVRI photometric standard stars in the magnitude range 11.5-16.0 around the celestial equator", Astronomical Journal, 104 (1): 340–371, 436–491, Bibcode:1992AJ....104..340L, doi:10.1086/116242.
- ^ a b Riaz, Basmah; Gizis, John E.; Harvin, James (August 2006), "Identification of New M Dwarfs in the Solar Neighborhood", The Astronomical Journal, 132 (2): 866–872, arXiv:astro-ph/0606617, Bibcode:2006AJ....132..866R, doi:10.1086/505632.
- ^ a b Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series, 34: 1–49, Bibcode:1978A&AS...34....1N.
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ Boro Saikia, S.; Marvin, C. J.; Jeffers, S. V.; Reiners, A.; Cameron, R.; Marsden, S. C.; Petit, P.; Warnecke, J.; Yadav, A. P.; Teske, J. K.; Shectman, S. A.; Crane, J. D.; Thompson, I.; Keiser, S.; Jenkins, J. S.; Berdiñas, Z.; Diaz, M.; Kiraga, M.; Barnes, J. R. (2018), "Chromospheric activity catalogue of 4454 cool stars. Questioning the active branch of stellar activity cycles", Astronomy and Astrophysics, 616: A108, arXiv:1803.11123, Bibcode:2018A&A...616A.108B, doi:10.1051/0004-6361/201629518, S2CID 118915212.
- ^ a b c Yee, Samuel W.; Petigura, Erik A.; von Braun, Kaspar (2017), "Precision Stellar Characterization of FGKM Stars using an Empirical Spectral Library", The Astrophysical Journal, 836 (1): 77, arXiv:1701.00922, Bibcode:2017ApJ...836...77Y, doi:10.3847/1538-4357/836/1/77, S2CID 6302522.
{{citation}}: CS1 maint: unflagged free DOI (link) - ^ a b c Houdebine, Éric R.; Mullan, D. J.; Doyle, J. G.; de la Vieuville, Geoffroy; Butler, C. J.; Paletou, F. (2019), "The Mass–Activity Relationships in M and K Dwarfs. I. Stellar Parameters of Our Sample of M and K Dwarfs", The Astronomical Journal, 158 (2): 56, arXiv:1905.07921, Bibcode:2019AJ....158...56H, doi:10.3847/1538-3881/ab23fe, S2CID 159041104.
{{citation}}: CS1 maint: unflagged free DOI (link) - ^ a b McLean, M.; Berger, E.; Reiners, A. (February 2012), "The Radio Activity-Rotation Relation of Ultracool Dwarfs", The Astrophysical Journal, 746 (1): 23, arXiv:1108.0415, Bibcode:2012ApJ...746...23M, doi:10.1088/0004-637X/746/1/23, S2CID 119159519.
- ^ "TZ Ari -- Flare Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-08-18.
- ^ Gershberg, R. E.; Katsova, M. M.; Lovkaya, M. N.; Terebizh, A. V.; Shakhovskaya, N. I. (1999), "Catalogue and bibliography of the UV Cet-type flare stars and related objects in the solar vicinity", Astronomy and Astrophysics Supplement Series, 139 (3): 555–558, Bibcode:1999A&AS..139..555G, doi:10.1051/aas:1999407.
- ^ Kukarkin, B. V.; Kholopov, P. N.; Perova, N. B. (October 1970), "57th Name-List of Variable Stars", Information Bulletin on Variable Stars, 480 (1): 1, Bibcode:1970IBVS..480....1K.
- ^ Barnes, J. R.; et al. (2019-06-11), Frequency of planets orbiting M dwarfs in the Solar neighbourhood, arXiv:1906.04644v1, Bibcode:2019arXiv190604644T.
- ^ a b Feng, Fabo; Shectman, Stephen A.; Clement, Matthew S.; Vogt, Steven S.; Tuomi, Mikko; Teske, Johanna K.; Burt, Jennifer; Crane, Jeffrey D.; Holden, Bradford; Sharon Xuesong Wang; Thompson, Ian B.; Diaz, Matias R.; Paul Butler, R. (2020), Search for Nearby Earth Analogs. III. Detection of ten new planets, three planet candidates, and confirmation of three planets around eleven nearby M dwarfs, arXiv:2008.07998, doi:10.3847/1538-4365/abb139, S2CID 221150644
{{citation}}: CS1 maint: unflagged free DOI (link)
Further reading
- Harrington, R. S.; Dahn, C. C. (April 1980), "Summary of U.S. Naval Observatory parallaxes", Astronomical Journal, 85: 454–465, Bibcode:1980AJ.....85..454H, doi:10.1086/112696.
- Riaz, Basmah; Gizis, John E.; Harvin, James (2006), "Identification of New M Dwarfs in the Solar Neighborhood", The Astronomical Journal, 132 (2): 866–872, arXiv:astro-ph/0606617, Bibcode:2006AJ....132..866R, doi:10.1086/505632 Table 1.
- Dittmann, Jason A.; Irwin, Jonathan M.; Charbonneau, David; Berta-Thompson, Zachory K. (2014), "Trigonometric Parallaxes for 1507 Nearby Mid-to-late M Dwarfs", The Astrophysical Journal, 784 (2): 156, arXiv:1312.3241, Bibcode:2014ApJ...784..156D, doi:10.1088/0004-637X/784/2/156, S2CID 18789867 Table with parallaxes.
