TZ Arietis
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TZ Arietis (also known as Gliese 83.1, GJ 9066, or L 1159-16) is a
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in the
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constellation A constellation is an area on the celestial sphere in which a group of visible stars forms Asterism (astronomy), a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object. The origins of the e ...
of
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. 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 . It is a flare star, which means it can suddenly increase in brightness for short periods of time.


Variability

TZ Arietis 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. It was given the
variable star designation In astronomy, a variable star designation is a unique identifier given to variable stars. It uses a variation on the Bayer designation format, with an identifying label (as described below) preceding the Latin genitive of the name of the constell ...
TZ Arietis in 1970.


Planetary system

In a
preprint In academic publishing, a preprint is a version of a scholarly or scientific paper that precedes formal peer review and publication in a peer-reviewed scholarly or scientific journal. The preprint may be available, often as a non-typeset versio ...
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. A paper published in August 2020 reported a confirmation of the 240-day and 770-day planets, designating them "b" and "c", respectively. In March 2022, astronomers using the
Calar Alto Observatory The Calar Alto Observatory (Centro Astronómico Hispano en Andalucía or "Spanish Astronomical Centre in Andalusia") is an astronomical observatory located in Almería province in Spain on Calar Alto, a mountain in the Sierra de Los Filabres ra ...
in Spain, as part of the
CARMENES The CARMENES survey (Calar Alto high-Resolution search for M-dwarfs with Exoearths with Near-infrared and optical Échelle Spectrographs) is a project to examine approximately 300 M-dwarf stars for signs of exoplanets with the CARMENES instrument o ...
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. The NASA Exoplanet Archive still refers to the confirmed, 770-day planet as "c".


See also

* List of nearest stars and brown dwarfs


References


Notes


Further reading

* * tp://cdsarc.u-strasbg.fr/pub/J/AJ/132/866/table1.dat Table 1
Table with parallaxes


External links




luyten-1159-16

Image luyten-1159-16

GJ 83.1

Image TZ Arietis
{{Stars of Aries Local Bubble M-type main-sequence stars Aries (constellation) Flare stars 0083.1 Arietis, TZ J02001278+1303112 Planetary systems with one confirmed planet