Astronomy:L 1159-16
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Short description: Nearby flare star in the constellation Aries
Coordinates: 
02h 00m 12.959s, +13° 03′ 07.01″
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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) | 223.7321 ± 0.0699[5] mas |
| Distance | 14.578 ± 0.005 ly (4.470 ± 0.001 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 Location of L 1159-16 in the constellation Aries | |
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[15] | ≥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 |
— | — |
In March 2022, astronomers using the Calar Alto Observatory in Spain, as part of the CARMENES survey project, reported they had found no evidence for the planet L 1159-16 b at a period of 241.59 days, and confidently defined candidate L 1159-16 d as nothing more than a spurious chromatic effect of the star, linked to its rotation. They did confirm L 1159-16 c, re-designated it as L 1159-16 b, and updated its parameters.[16]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b[17] | ≥0.23±0.02 MJ | 0.88±0.02 | 772.05+2.41 −1.84 |
0.49+0.06 −0.07 |
— | — |
See also
References
- ↑ 1.0 1.1 1.2 1.3 Zacharias, N. et al. (2003), "The Second U.S. Naval Observatory CCD Astrograph Catalog (UCAC2)", CDS/ADC Collection of Electronic Catalogues 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, doi:10.1086/116242, Bibcode: 1992AJ....104..340L.
- ↑ 3.0 3.1 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, doi:10.1086/505632, Bibcode: 2006AJ....132..866R.
- ↑ 4.0 4.1 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. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ Boro Saikia, S. et al. (2018), "Chromospheric activity catalogue of 4454 cool stars. Questioning the active branch of stellar activity cycles", Astronomy and Astrophysics 616: A108, doi:10.1051/0004-6361/201629518, Bibcode: 2018A&A...616A.108B.
- ↑ 7.0 7.1 7.2 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, doi:10.3847/1538-4357/836/1/77, Bibcode: 2017ApJ...836...77Y.
- ↑ 8.0 8.1 8.2 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, doi:10.3847/1538-3881/ab23fe, Bibcode: 2019AJ....158...56H.
- ↑ 9.0 9.1 McLean, M.; Berger, E.; Reiners, Ansgar (February 2012), "The Radio Activity-Rotation Relation of Ultracool Dwarfs", The Astrophysical Journal 746 (1): 23, doi:10.1088/0004-637X/746/1/23, Bibcode: 2012ApJ...746...23M.
- ↑ "TZ Ari -- Flare Star", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-id?Ident=TZ+Arietis, 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, doi:10.1051/aas:1999407, Bibcode: 1999A&AS..139..555G.
- ↑ 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) (in en), Frequency of planets orbiting M dwarfs in the Solar neighbourhood, Bibcode: 2019arXiv190604644T.
- ↑ 14.0 14.1 Feng, Fabo et al. (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. doi:10.3847/1538-4365/abb139.
- ↑ 15.0 15.1 Planet GJ 9066 b, Extrasolar Planets Encyclopaedia, http://exoplanet.eu/catalog/gj_9066_b/, retrieved 31 March 2022, "Planet Status: Confirmed"
- ↑ 16.0 16.1 Quirrenbach, A.; et al. (2022). "The CARMENES search for exoplanets around M dwarfs: Two Saturn-mass planets orbiting active stars". arXiv:2203.16504 [astro-ph.EP].
- ↑ 17.0 17.1 Planet TZ Ari b, Extrasolar Planets Encyclopaedia, http://exoplanet.eu/catalog/tz_ari_b/, retrieved 31 March 2022, "Planet Status: Confirmed"
Further reading
- Harrington, R. S.; Dahn, C. C. (April 1980), "Summary of U.S. Naval Observatory parallaxes", Astronomical Journal 85: 454–465, doi:10.1086/112696, Bibcode: 1980AJ.....85..454H.
- Riaz, Basmah; Gizis, John E.; Harvin, James (2006), "Identification of New M Dwarfs in the Solar Neighborhood", The Astronomical Journal 132 (2): 866–872, doi:10.1086/505632, Bibcode: 2006AJ....132..866R 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, doi:10.1088/0004-637X/784/2/156, Bibcode: 2014ApJ...784..156D Table with parallaxes.
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