GJ 1151

GJ 1151 is a star located in the northern circumpolar constellation of Ursa Major at a distance of 26.2 light years from the Sun. It has a reddish hue and is too faint to be visible to the naked eye with an apparent visual magnitude of 14.0[2] The star is moving closer with a radial velocity of −36 km/s,[4] and has a relatively large proper motion, traversing the celestial sphere at a rate of 1.815″·yr−1.[6]

GJ 1151

Imaginary diagram of GJ 1151 and GJ 1151 b.
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Ursa Major
Right ascension 11h 50m 57.72145s[1]
Declination +48° 22′ 38.5625″[1]
Apparent magnitude (V) 14.008[2]
Characteristics
Spectral type dM4.5[2]
B−V color index 1.787[3]
Astrometry
Radial velocity (Rv)−36.01±0.28[4] km/s
Proper motion (μ) RA: -1545.069[1] mas/yr
Dec.: -962.724[1] mas/yr
Parallax (π)124.3378 ± 0.0549[1] mas
Distance26.23 ± 0.01 ly
(8.043 ± 0.004 pc)
Absolute magnitude (MV)14.482±0.022[2]
Details
Mass0.1540[3] M☉
Radius0.1903[3] R☉
Temperature3,143±26[2] K
Metallicity [Fe/H]+0.04[2] dex
Rotational velocity (v sin i)2.0[4] km/s
Age2.5[3] Gyr
Other designations
GJ 1151, G 122-49, LHS 316, NLTT 28752, 2MASS J11505787+4822395, Gaia EDR3 786834302080370304[5]
Database references
SIMBADdata

This is a small red dwarf star of spectral type dM4.5.[2] It is 2.5[3] billion years old and is spinning with a projected rotational velocity of 2.0 km/s.[4] The star has 15.4%[3] of the mass of the Sun and 19.0%[3] of the Sun's radius, with an effective temperature of 3,143 K.[2]

Planetary system

In 2020, astronomers announced the discovery of radio emissions from the star which are consistent with the star having a magnetic interaction with a planet approximately the size of Earth, revolving in a 1-5 day long orbit.[7][8][9][10][11][12] Such an interaction would be analogous to a scaled-up version of the Jupiter-Io magnetic interaction, with GJ 1151 taking the role of Jupiter and its planet the role of Io. The discovery was confirmed in February 2021 utilizing a radial velocity method.[13]

The planetary system[8][13]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 2.5±0.5 M⊕ 0.01735+0.00065
−0.00070		 2.0183+0.0084
−0.0008		 — — 1.35+0.53
−0.29 R⊕

See also

References
  1. Brown, A. G. A.; et al. (Gaia collaboration). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics (in press). arXiv:2012.01533. doi:10.1051/0004-6361/202039657. S2CID 227254300. Gaia EDR3 record for this source at VizieR.
  2. Houdebine, Éric R.; et al. (August 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): 17. arXiv:1905.07921. Bibcode:2019AJ....158...56H. doi:10.3847/1538-3881/ab23fe. S2CID 159041104. 56.
  3. Mann, Andrew W.; et al. (May 2015). "How to Constrain Your M Dwarf: Measuring Effective Temperature, Bolometric Luminosity, Mass, and Radius". The Astrophysical Journal. 804 (1): 38. arXiv:1501.01635. Bibcode:2015ApJ...804...64M. doi:10.1088/0004-637X/804/1/64. S2CID 19269312. 64.
  4. Jeffers, S. V.; et al. (June 2018). "CARMENES input catalogue of M dwarfs. III. Rotation and activity from high-resolution spectroscopic observations". Astronomy & Astrophysics. 614: 19. arXiv:1802.02102. Bibcode:2018A&A...614A..76J. doi:10.1051/0004-6361/201629599. S2CID 56147445. A76.
  5. "G 122-49". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-03-02.
  6. Lépine, Sébastien; Shara, Michael M. (March 2005). "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)". The Astronomical Journal. 129 (3): 1483–1522. arXiv:astro-ph/0412070. Bibcode:2005AJ....129.1483L. doi:10.1086/427854. S2CID 2603568.
  7. Vedantham, H. K.; et al. (2020-02-17). "Coherent radio emission from a quiescent red dwarf indicative of star–planet interaction". Nature Astronomy. 4 (6): 577–583. arXiv:2002.08727. Bibcode:2020NatAs.tmp...34V. doi:10.1038/s41550-020-1011-9. ISSN 2397-3366. S2CID 211204712.
  8. Pope, Benjamin J. S.; et al. (17 February 2020). "No Massive Companion to the Coherent Radio-emitting M Dwarf GJ 1151". The Astrophysical Journal Letters. 890 (2): L19. arXiv:2002.07850. Bibcode:2020ApJ...890L..19P. doi:10.3847/2041-8213/ab5b99. S2CID 211171765. Retrieved 1 March 2020.
  9. Starr, Michelle (29 February 2020). "For The First Time, Astronomers Have Detected an Exoplanet Using Radio Waves". ScienceAlert.com. Retrieved 1 March 2020.
  10. "Radio telescope measures aurorae in distant planetary system". UPI. Retrieved 2020-02-26.
  11. Redd, Nola Taylor. "New Exoplanet Search Strategy Claims First Discovery". Quanta Magazine. Retrieved 2020-02-26.
  12. Clark, Stuart. "An exoplanet is generating radio waves from its red dwarf sun". New Scientist. Retrieved 2020-02-26.
  13. The Habitable-zone Planet Finder Detects a Terrestrial-mass Planet Candidate Closely Orbiting Gliese 1151: The Likely Source of Coherent Low-frequency Radio Emission from an Inactive Star, 2021, arXiv:2102.02233
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