TZ Arietis (also known as Gliese 83.1, GJ 9066, or 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 at a distance of 14.6 light-years (4.47 parsecs). It is a flare star, which means it can suddenly increase in brightness for short periods of time.

Variability

A light curve for TZ Arietis, plotted from TESS data.[10] The blue points show the BY Draconis-type variability, and the red points show a flare. The inset plot shows the flare with an expanded horizontal scale. The star's 2.0 day rotation period[11] is marked in green.

William E. Kunkel announced that TZ Arietis is a variable star in 1968.[12] 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.[13] It was given the variable star designation TZ Arietis in 1970.[14]

Planetary system

In a preprint submitted to arXiv in June 2019, three candidate planets were reported in orbit around this star (GJ 83.1) with orbital periods of 2, 240, and 770 days.[15] A paper published in August 2020 reported a confirmation of the 240-day and 770-day planets, designating them "b" and "c", respectively.[16]

In March 2022, astronomers using the Calar Alto Observatory in Spain, as part of the CARMENES survey project, reported an independent confirmation of the 770-day planet, which they designated "b". However, they found no evidence for the 240-day planet, and confidently defined the 2-day candidate as nothing more than a spurious chromatic effect of the star, linked to its rotation.[17] The NASA Exoplanet Archive still refers to the confirmed, 770-day planet as "c".[18]

The TZ Arietis planetary system[17]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b[note 1] ≥0.21±0.02 MJ 0.88±0.02 771.36+1.34
−1.23 		0.46±0.04 — —

References

  1. ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ 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.
  3. ^ 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, S2CID 6282011.
  4. ^ 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.
  5. ^ 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, arXiv:1803.11123, Bibcode:2018A&A...616A.108B, doi:10.1051/0004-6361/201629518, S2CID 118915212.
  6. ^ 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.
  7. ^ 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.
  8. ^ a b McLean, M.; Berger, E.; Reiners, Ansgar (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.
  9. ^ "TZ Ari -- Flare Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-08-18.
  10. ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 27 November 2023.
  11. ^ Shan, Y.; Revilla, D.; Skrzypinski, S. L.; Dreizler, S.; Béjar, V. J. S.; Caballero, J. A.; Cardona Guillén, C.; Cifuentes, C.; Fuhrmeister, B.; Reiners, A.; Vanaverbeke, S.; Ribas, I.; Quirrenbach, A.; Amado, P. J.; Aceituno, F. J.; Casanova, V.; Cortés-Contreras, M.; Dubois, F.; Gorrini, P.; Henning, Th.; Herrero, E.; Jeffers, S. V.; Kemmer, J.; Lalitha, S.; Lodieu, N.; Logie, L.; López González, M. J.; Martín-Ruiz, S.; Montes, D.; Morales, J.C.; Nagel, E.; Pallé, E.; Perdelwitz, V.; Pérez-Torres, M.; Pollacco, D.; Rau, S.; Rodríguez-López, C.; Rodríguez, E.; Schöfer, P.; Seifert, W.; Sota, A.; Zapatero Osorio, M. R.; Zechmeister, M. (April 2024). "CARMENES input catalog of M dwarfs. VII. New rotation periods for the survey stars and their correlations with stellar activity" (PDF). Astronomy & Astrophysics. 684. Bibcode:2024A&A...684A...9S. doi:10.1051/0004-6361/202346794. Retrieved 28 November 2024.
  12. ^ Kunkel, W. E. (August 1968). "Observations of the Flare Stars G3-33 and G24-16" (PDF). Information Bulletin on Variable Stars. 294: 1–4. Bibcode:1968IBVS..294....1K. Retrieved 28 November 2024.
  13. ^ 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.
  14. ^ 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.
  15. ^ Barnes, J. R.; et al. (2019-06-11), Frequency of planets orbiting M dwarfs in the Solar neighbourhood, arXiv:1906.04644.
  16. ^ Feng, Fabo; Shectman, Stephen A.; Clement, Matthew S.; Vogt, Steven S.; Tuomi, Mikko; Teske, Johanna K.; Burt, Jennifer; Crane, Jeffrey D.; Holden, Bradford; Wang, Sharon Xuesong; Thompson, Ian B.; Díaz, Matías R.; Butler, R. Paul (2020), "Search for Nearby Earth Analogs .III. Detection of 10 New Planets, 3 Planet Candidates, and Confirmation of 3 Planets around 11 Nearby M Dwarfs", The Astrophysical Journal Supplement Series, 250 (2): 29, arXiv:2008.07998, Bibcode:2020ApJS..250...29F, doi:10.3847/1538-4365/abb139, S2CID 221150644.
  17. ^ a b Quirrenbach, A.; et al. (2022), "The CARMENES search for exoplanets around M dwarfs", Astronomy & Astrophysics, 663: A48, arXiv:2203.16504, Bibcode:2022A&A...663A..48Q, doi:10.1051/0004-6361/202142915, S2CID 247835988.
  18. ^ "GJ 9066". NASA Exoplanet Archive. Retrieved 27 September 2022.

Notes

  1. ^ Referred to as c by some sources.

Further reading

Allikas: https://en.wikipedia.org/wiki/TZ_Arietis
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