astro.wikisort.org - StarGliese 176 is a red dwarf in the constellation of Taurus. Based upon parallax measurements from the Hipparcos mission, it is located approximately 30 light-years away.[1] The star is orbited by a Super-Earth.
Red dwarf star in the constellation Taurus
Gliese 176
Observation data
Epoch J2000.0 Equinox J2000.0 |
| Constellation |
Taurus |
|
| Right ascension |
04h 42m 55.7749s[1] |
| Declination |
+18° 57′ 29.399″[1] |
| Apparent magnitude (V) |
9.95 |
| Characteristics |
|
| Spectral type |
M2V[2] |
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| B−V color index |
1.523 ± 0.025[3] |
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| Variable type |
BY Dra |
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| Astrometry |
|---|
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| Radial velocity (Rv) | 26.4105 ± 0.0004[2] km/s |
| Proper motion (μ) | RA: 656.744±0.166[1] mas/yr
Dec.: −1116.790±0.104[1] mas/yr |
| Parallax (π) | 105.4275 ± 0.0210 mas[4] |
| Distance | 30.937 ± 0.006 ly
(9.485 ± 0.002 pc) |
| Absolute magnitude (MV) | 10.10 ± 0.06[2] |
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|---|
| Details |
|---|
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|---|
| Mass | 0.485 ± 0.012[5] M☉ |
| Radius | 0.474 ± 0.015[5] R☉ |
| Luminosity | 0.03516 ± 0.00032[5] L☉ |
| Temperature | 3,632+58
−56[5] K |
| Metallicity [Fe/H] | –0.1 ± 0.2[2] dex |
| Rotation | 40.00 ± 0.11[2] days |
| Rotational velocity (v sin i) | ≤0.8[2] km/s |
| Age | 0.56 Gyr |
|
|---|
| Other designations |
|---|
BD+18° 683, HD 285968, HIP 21932, Ross 33, 2MASS J04425581+1857285 |
| Database references |
|---|
| SIMBAD | data |
Extrasolar Planets
Encyclopaedia | data |
Planetary system
A planetary companion to Gliese 176 was announced in 2008.[6] Radial velocity observations with the Hobby-Eberly Telescope (HET) showed a 10.24-day periodicity, which was interpreted as being caused by a planet. With a semi-amplitude of 11.6 m/s, its minimum mass equated to 24.5 Earth masses, or approximately 1.4 Neptune masses.
Observations with the HARPS spectrograph could not confirm the 10.24-day variation.[2] Instead, two other periodicities were detected at 8.78 and 40.0 days, with amplitudes below the HET observational errors. The 40-day variation coincides with the rotational period of the star and is therefore caused by activity, but the shorter-period variation is not explained by activity and is therefore caused by a planet. Its semi-amplitude of 4.1 m/s corresponds to a minimum mass of 8.4 Earth masses, making the planet a Super-Earth.
In an independent study, observations with Keck-HIRES also failed to confirm the 10.24-day signal.[7] An 8.77-day periodicity - corresponding to the planet announced by the HARPS team - was detected to intermediate significance, though it was not deemed significant enough to claim a planetary cause with their data alone.
The Gliese 176 planetary system[8]
Companion
(in order from star) |
Mass |
Semimajor axis
(AU) |
Orbital period
(days) |
Eccentricity |
Inclination |
Radius |
| b |
≥9.06+1.54
−0.70 M🜨 |
0.066±0.001 |
8.776+0.001
−0.002 |
0.148+0.249
−0.036 |
— |
— |
See also
References
- Brown, A. G. A.; et al. (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics. 595. A2. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512. S2CID 1828208.Gaia Data Release 1 catalog entry
- Forveille, Thierry; Bonfils, Xavier; Delfosse, Xavier; Gillon, Michaël; Udry, Stéphane; Bouchy, François; Lovis, Christophe; Mayor, Michel; Pepe, Francesco; Perrier, Christian; Queloz, Didier; Santos, Nuno C.; Bertaux, Jean-Loup (2009). "The HARPS search for southern extra-solar planets. XIV. Gl 176b, a super-Earth rather than a Neptune, and at a different period". Astronomy and Astrophysics. 493 (2): 645–650. arXiv:0809.0750. Bibcode:2009A&A...493..645F. doi:10.1051/0004-6361:200810557.
- van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
- Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- Pineda, J. Sebastian; et al. (September 2021). "The M-dwarf Ultraviolet Spectroscopic Sample. I. Determining Stellar Parameters for Field Stars". The Astrophysical Journal. 918 (1): 23. arXiv:2106.07656. Bibcode:2021ApJ...918...40P. doi:10.3847/1538-4357/ac0aea. 40.
- Endl, Michael; et al. (2008). "An m sin i = 24 M🜨 Planetary Companion to the Nearby M Dwarf GJ 176". The Astrophysical Journal. 673 (2): 1165–1168. arXiv:0709.0944. Bibcode:2008ApJ...673.1165E. doi:10.1086/524703. S2CID 118332426.
- Butler, R. Paul; et al. (2009). "Nondetection of the Neptune-Mass Planet Reported Around GJ 176". The Astrophysical Journal. 691 (2): 1738–1743. Bibcode:2009ApJ...691.1738B. doi:10.1088/0004-637X/691/2/1738.
- Trifonov, Trifon; Kürster, Martin; Zechmeister, Mathias; Tal-Or, Lev; Caballero, José A.; Quirrenbach, Andreas; Amado, Pedro J.; Ribas, Ignasi; Reiners, Ansgar; et al. (2018). "The CARMENES search for exoplanets around M dwarfs. First visual-channel radial-velocity measurements and orbital parameter updates of seven M-dwarf planetary systems". Astronomy and Astrophysics. 609. A117. arXiv:1710.01595. Bibcode:2018A&A...609A.117T. doi:10.1051/0004-6361/201731442. S2CID 119340839.
На других языках
[de] Gliese 176
Gliese 176 (kurz: Gl 176 oder GJ 176 genannt), auch als HD 285968 katalogisiert, ist ein etwa 30 Lichtjahre von der Erde entfernter Roter Zwerg im Sternbild Stier. Er ist mit einer scheinbaren Helligkeit von 9,95 mag mit dem bloßen Auge auch unter optimalen Beobachtungsbedingungen nicht mehr zu sehen. Im Jahre 2007 entdeckte Michael Endl mit Hilfe der Radialgeschwindigkeitsmethode einen Exoplaneten, der diesen Stern umkreist und mit Gliese 176 b oder HD 285968 b bezeichnet wird.
- [en] Gliese 176
[es] Gliese 176
Gliese 176 (GJ 176 / HD 285968 / LHS 196)[1] es una estrella de magnitud aparente +10,08 situada en la constelación de Tauro. Desde 2007 se conoce la existencia de un planeta extrasolar en órbita alrededor de esta estrella.
[ru] Глизе 176
Глизе 176 (лат. Gliese 176) — звезда в созвездии Тельца. Находится на расстоянии около 31 светового года (9,42 пк) от Солнца. Вокруг звезды обращается, как минимум, одна планета.
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