Gliese 555

Gliese 555
	; A visual band light curve for HN Librae, adapted from Weis (1994)[1]
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Libra
Right ascension	14h 34m 16.81166s[2]
Declination	−12° 31′ 10.4145″[2]
Apparent magnitude (V)	11.317
Characteristics
Spectral type	M4.0V[3]
Variable type	BY Dra
Astrometry
Radial velocity (Rv)	−1.36±0.20[2] km/s
Proper motion (μ)	RA: −355.138 mas/yr[2] ; Dec.: 593.040 mas/yr[2]
Parallax (π)	159.9225 ± 0.0546 mas[2]
Distance	20.395 ± 0.007 ly ; (6.253 ± 0.002 pc)
Details[3]
Mass	0.291±0.013 M☉
Radius	0.299±0.009 R☉
Luminosity (bolometric)	0.010106±0.000069 L☉
Surface gravity (log g)	4.76±0.13 cgs
Temperature	3347±50 K
Metallicity [Fe/H]	−0.18±0.15 dex
Rotation	96±2 d
Rotational velocity (v sin i)	<2.0 km/s
Age	0.8–8.0 Gyr
Other designations
	HN Lib, BD−11 3759[4], GJ 555[5], HIP 71253[6], Ci 20 870[7], LFT 1120, LHS 2945[8], LPM 532, LTT 5759, NLTT 37751[9], PLX 3296[10], PM 14316-1219, Wolf 1481[11], TYC 5572-804-1[12][13], GSC 05572-00804, 2MASS J14341683-1231106
Database references
SIMBAD	data
	Gliese 555 Location of Gliese 555 in the constellation Libra;

Gliese 555, also known as HN Librae, is a red dwarf star of spectral type M4.0V, located in the constellation Libra at a distance of 20.4 light-years (6.3 parsecs) from Earth.[2]

Planetary system

In 2019, one planet candidate detected by radial velocity was reported in a preprint, among 118 planets around M dwarf stars. This would have a minimum mass about 30 times that of Earth and orbit with a period of about 450 days.[14]

However, later radial velocity observations by the CARMENES survey published in 2023 did not confirm a planet at this period, but instead found a different planet.[15] This is a super-Earth or mini-Neptune (the discovery paper uses the term "sub-Neptune") with a minimum mass of 5.5 Earths and a period of 36 days, placing it within the habitable zone. A second planet candidate was also found, with a minimum mass of 9.7 Earths and a period of 113 days, but this signal could not be confirmed as having a planetary origin due to its similarity to the rotation period of the star.[3]

The Gliese 555 planetary system[3]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	≥5.46±0.75 M_🜨	0.1417±0.0023	36.116+0.027 −0.029	0.079+0.090 −0.055	—	—
c (unconfirmed)	≥9.7±1.9 M_🜨	0.3040+0.0048 −0.0051	113.46+0.19 −0.20	—	—	—

References

Weis, Edward W. (March 1994). "Long Term Variability in Dwarf M Stars". The Astronomical Journal. 107: 1135–1140. Bibcode:1994AJ....107.1135W. doi:10.1086/116925. Retrieved 20 January 2022.
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.
González-Álvarez, E.; Kemmer, J.; et al. (July 2023). "The CARMENES search for exoplanets around M dwarfs. A sub-Neptunian mass planet in the habitable zone of HN Lib". Astronomy & Astrophysics. 675: A141. arXiv:2305.19677. Bibcode:2023A&A...675A.141G. doi:10.1051/0004-6361/202346276.
Schönfeld, Eduard; et al. (1886). "BD -11 3759". Southern Durchmusterung.
Gliese, W.; Jahreiß, H. (1991). "Gl 555". Preliminary Version of the Third Catalogue of Nearby Stars.
Perryman; et al. (1997). "HIP 71253". The Hipparcos and Tycho Catalogues.
Porter, J. G.; Yowell, E. J.; Smith, E. S. (1930). "A catalogue of 1474 stars with proper motion exceeding four-tenths year". Publications of the Cincinnati Observatory. 20: 1–32. Bibcode:1930PCinO..20....1P. Page 20 (Ci 20 870).
Luyten, Willem Jacob (1979). "LHS 2945". LHS Catalogue, 2nd Edition.
Luyten, Willem Jacob (1979). "NLTT 37751". NLTT Catalogue.
Van Altena W. F.; Lee J. T.; Hoffleit E. D. (1995). "GCTP 3296". The General Catalogue of Trigonometric Stellar Parallaxes (Fourth ed.).
Wolf, M. (1925). "Einige bewegte Sterne in Virgo und Libra". Astronomische Nachrichten. 225 (12): 215–216. Bibcode:1925AN....225R.215W. doi:10.1002/asna.19252251205. Page 215/216 (Wolf 1481)
Perryman; et al. (1997). "HIP 71253". The Hipparcos and Tycho Catalogues.
Hog; et al. (2000). "TYC 5572-804-1". The Tycho-2 Catalogue.
Barnes, J. R.; Kiraga, M.; Diaz, M.; Berdiñas, Z.; Jenkins, J. S.; Keiser, S.; Thompson, I.; Crane, J. D.; Shectman, S. A. (2019-06-11). "Frequency of planets orbiting M dwarfs in the Solar neighbourhood". arXiv:1906.04644 [astro-ph.EP].
Ribas, I.; Reiners, A.; et al. (February 2023). "The CARMENES search for exoplanets around M dwarfs. Guaranteed time observations Data Release 1 (2016-2020)". Astronomy & Astrophysics. 670: A139. arXiv:2302.10528. Bibcode:2023A&A...670A.139R. doi:10.1051/0004-6361/202244879.

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[Weis-1] Weis, Edward W. (March 1994). "Long Term Variability in Dwarf M Stars". The Astronomical Journal. 107: 1135–1140. Bibcode:1994AJ....107.1135W. doi:10.1086/116925. Retrieved 20 January 2022.

[GaiaDR3-2] 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.

[González-Álvarez2023-3] González-Álvarez, E.; Kemmer, J.; et al. (July 2023). "The CARMENES search for exoplanets around M dwarfs. A sub-Neptunian mass planet in the habitable zone of HN Lib". Astronomy & Astrophysics. 675: A141. arXiv:2305.19677. Bibcode:2023A&A...675A.141G. doi:10.1051/0004-6361/202346276.

[SD-4] Schönfeld, Eduard; et al. (1886). "BD -11 3759". Southern Durchmusterung.

[Gliese1991-5] Gliese, W.; Jahreiß, H. (1991). "Gl 555". Preliminary Version of the Third Catalogue of Nearby Stars.

[Perryman1997-6] Perryman; et al. (1997). "HIP 71253". The Hipparcos and Tycho Catalogues.

[Porter1930-7] Porter, J. G.; Yowell, E. J.; Smith, E. S. (1930). "A catalogue of 1474 stars with proper motion exceeding four-tenths year". Publications of the Cincinnati Observatory. 20: 1–32. Bibcode:1930PCinO..20....1P. Page 20 (Ci 20 870).

[Luyten1979_LHS-8] Luyten, Willem Jacob (1979). "LHS 2945". LHS Catalogue, 2nd Edition.

[Luyten1979_NLTT-9] Luyten, Willem Jacob (1979). "NLTT 37751". NLTT Catalogue.

[van_Altena1995-10] Van Altena W. F.; Lee J. T.; Hoffleit E. D. (1995). "GCTP 3296". The General Catalogue of Trigonometric Stellar Parallaxes (Fourth ed.).

[Wolf1925-11] Wolf, M. (1925). "Einige bewegte Sterne in Virgo und Libra". Astronomische Nachrichten. 225 (12): 215–216. Bibcode:1925AN....225R.215W. doi:10.1002/asna.19252251205. Page 215/216 (Wolf 1481)

[Perryman1997_tyc-12] Perryman; et al. (1997). "HIP 71253". The Hipparcos and Tycho Catalogues.

[Hog2000-13] Hog; et al. (2000). "TYC 5572-804-1". The Tycho-2 Catalogue.

[Tuomi2019-14] Barnes, J. R.; Kiraga, M.; Diaz, M.; Berdiñas, Z.; Jenkins, J. S.; Keiser, S.; Thompson, I.; Crane, J. D.; Shectman, S. A. (2019-06-11). "Frequency of planets orbiting M dwarfs in the Solar neighbourhood". arXiv:1906.04644 [astro-ph.EP].

[Ribas2023-15] Ribas, I.; Reiners, A.; et al. (February 2023). "The CARMENES search for exoplanets around M dwarfs. Guaranteed time observations Data Release 1 (2016-2020)". Astronomy & Astrophysics. 670: A139. arXiv:2302.10528. Bibcode:2023A&A...670A.139R. doi:10.1051/0004-6361/202244879.