Draft:TOI-715
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Last edited by InTheAstronomy32 (talk | contribs) 3 months ago. (Update) |
TOI-715 is a red dwarf star located 42 parsecs (140 ly) from the Earth in the constellation Volans[note 1], very close to the southern celestial pole.[2] It hosts one confirmed exoplanet, named TOI-715 b, is an super-Earth orbiting on its habitable zone.[2] Another planet in the system is suspected.[2] The star has an apparent magnitude of 16.7 and is too faint to be seen with the naked eye or even a small telescope.[3] It is smaller and cooler than the Sun, having a radius of 0.24 R☉ and a temperature of 3,075 K (2,802 °C).[2] Its age is estimated at 6.2 billion years, which is older than the Sun, but the marging of error of +3.2
−2.2 implies that its age is between 4 and 9.4 billion years.[2]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Volans |
| Right ascension | 07h 35m 24.26s[1] |
| Declination | −73° 34′ 38.83″[1] |
| Apparent magnitude (V) | 16.683[4] |
| Characteristics | |
| Evolutionary stage | Red dwarf |
| Spectral type | M4V |
| Astrometry | |
| Proper motion (μ) | RA: 82.6344±0.0779 mas/yr[4] Dec.: 9.9872±0.0982 mas/yr[4] |
| Parallax (π) | 23.5534 mas[4][5] |
| Distance | 138.24±0.28 ly (42.41±0.09 pc)[4] |
| Details[2] | |
| Mass | 0.225±0.012 M☉ |
| Radius | 0.24±0.012 R☉ |
| Temperature | 3075±75 K |
| Metallicity [Fe/H] | 0.09±0.2 dex |
| Age | 6.6+3.3 −2.2 Gyr |
| Other designations | |
Characteristics[edit]
TOI-715 is a red dwarf star, a type of stars that are smaller, cooler and dimmer than the Sun, and are the most common type of stars in the Universe.[6] TOI-715 in particular has 24% of the Sun's radius, 23% of its mass, and a surface temperature of 3,075 K (2,802 °C),[2] while the Sun has a surface temperature of 5,772 K (5,499 °C). TOI-715 b is older than the Sun and has an age of 6.6+3.3
−2.2 billion years,[7] and therefore has an lower magnetic activity. Its metalicity, i.e the abundance of elements other than hydrogen and helium, is 23% larger than the Sun's metalicity.[a]
Planetary system[edit]
In 2023, a planetary companion was detected around TOI-715. The planet was initially indentified by the Transiting Exoplanet Survey Satellite (TESS), in May 24, 2019, and later confirmed using ground-based photometry.[2] Designated TOI-715 b, the planet is a super-Earth (radius = 1.55 R🜨) that is orbiting within its star's conservative habitable zone, and was the first TESS discovery in this region.[2] The planet has an orbital period of 19 days and is orbiting its star at a distance of 0.083 astronomical units (12,400,000 km).[2] It receives a insolation from its host star equivalent to 67% of the insolation received of Earth from the Sun, and has a equilibrium temperature of -39 °C.
Another planet in the system is suspected. This planet has an orbital period of 25.6 days and has a radius of 1.066 R🜨. It is located in the outer edge of the habitable zone. If confirmed, it would be the smallest habitable-zone planet discovered by TESS.
The planet TOI-715 b could be more closely scrutinized by the James Webb Space Telescope for confirming the existence of an atmosphere.[8] If TOI-715 b is an ocean planet, its atmosphere would be more proeminent and easier to detect than that of a massive, dense, dry planet.[8] The planet can also be characterizied with precise radial velocity measurements and transmission spectroscopy, and detailed follow-up research of this planet can help the undestaining of the formation of small and close-in planets.[2]
The planetary system of TOI-715 is located relatively close to Earth, at a distance of 137 light-years.
Conservative habitable zone[edit]
The concept of "conservative habitable zone" was defined by Koparappu et al. in 2014.[9] It is the region where the planet receives a insolation equivalent to 0.42 to 0.842 times equivalente to the insolation recieved from Earth by the Sun.[9] As both planets have insolations equivalent to 0.67+0.15
−0.20 S🜨 and 0.48+0.12
−0.17 S🜨 respectively, they are located inside the conservative habitable zone.[2]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | — | 0.0830±0.0027 | 19.288 | — | 89.856+0.018 −0.017° |
1.55±0.064 R🜨 |
| TOI-715.02 (unconfirmed) | — | 0.0986±0.0054 | 25.607 | — | 89.72+0.14 −0.12° |
1.066±0.092 R🜨 |
References[edit]
- ^ a b c 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.
- ^ a b c d e f g h i j k l m Dransfield, Georgina; Timmermans, Mathilde; Triaud, Amaury H. M. J.; Dévora-Pajares, Martín; Aganze, Christian; Barkaoui, Khalid; Burgasser, Adam J.; Collins, Karen A.; Cointepas, Marion; Ducrot, Elsa; Günther, Maximilian N.; Howell, Steve B.; Murray, Catriona A.; Niraula, Prajwal; Rackham, Benjamin V. (2024-01-01). "A 1.55 R⊕ habitable-zone planet hosted by TOI-715, an M4 star near the ecliptic South Pole". Monthly Notices of the Royal Astronomical Society. 527: 35–52. doi:10.1093/mnras/stad1439. ISSN 0035-8711.
- ^ "★ TOI 715". Stellar Catalog. Retrieved 2024-02-09.
- ^ a b c d "TOI-715 | NASA Exoplanet Archive". exoplanetarchive.ipac.caltech.edu. Retrieved 2024-02-05.
- ^ a b "TOI-715". SIMBAD. Retrieved February 5, 2024.
- ^ "Red dwarf star | Definition, Facts, & Temperature | Britannica". Britannica. Retrieved 2024-02-14.
- ^ Anderson, Natali (2024-02-05). "Astronomers Find Super-Earth Exoplanet in Habitable Zone of TOI-715 | Sci.News". Sci.News: Breaking Science News. Retrieved 2024-02-14.
- ^ a b Brennan, Pat (January 31, 2024). "Discovery Alert: A 'Super-Earth' in the Habitable Zone - NASA Science". science.nasa.gov. Retrieved February 14, 2024.
- ^ a b Gough, Evan (2024-02-02). "A Super-Earth (and Possible Earth-Sized) Exoplanet Found in the Habitable Zone". Universe Today. Retrieved 2024-02-14.