HD 260655

Last updated
HD 260655
Observation data
Epoch J2000        Equinox J2000
Constellation Gemini
Right ascension 06h 37m 10.79880s [1]
Declination +17° 33′ 53.3332″ [1]
Apparent magnitude  (V)9.77±0.11 [2]
Characteristics
Evolutionary stage Main sequence
Spectral type M0.0V [2]
Apparent magnitude  (B)11.10±0.07 [2]
Apparent magnitude  (V)9.77±0.11 [2]
Apparent magnitude  (G)8.878±0.003 [2]
Apparent magnitude  (J)6.674±0.024 [2]
Apparent magnitude  (H)6.031±0.016 [2]
Apparent magnitude  (K)5.862±0.024 [2]
Astrometry
Radial velocity (Rv)−58.64±0.16 [1]  km/s
Proper motion (μ)RA: −764.414  mas/yr [1]
Dec.: 337.883  mas/yr [1]
Parallax (π)100.0232 ± 0.0208  mas [1]
Distance 32.608 ± 0.007  ly
(9.998 ± 0.002  pc)
Details [2]
Mass 0.439±0.011  M☉
Radius 0.439±0.003  R☉
Luminosity (bolometric)0.03631±0.00018  L☉
Surface gravity (log g)5.20±0.07  cgs
Temperature 3803±10  K
Metallicity [Fe/H]−0.43±0.04  dex
Rotation 37.5±0.4  d
Rotational velocity (v sin i)<2.0 km/s
Age 2-8  Gyr
Other designations
BD+17 1320, GJ  239, HD  260655, HIP  31635, CCDM J06372+1734A, WDS J06372+1733A, Ci  20 393, G 110-5, G 109-14, G 105-49, LFT  477, LHS  1858, LSPM J0637+1733, LTT  11880, NLTT  16743, PLX  1538, PM  J06371+1733, Wolf  287, TOI-4599, TIC  307809773, TYC  1333-1683-1, GCRV  4273, IRAS 06342+1736, 2MASS J06371092+1733526 [3] [2]
Database references
SIMBAD data

HD 260655 (also known as GJ 239 or TOI-4599) [2] is a relatively bright and cool M0 V red dwarf star located 33 light-years (10 parsecs) away from the Solar System in the constellation of Gemini. HD 260655 has two confirmed rocky planets, named HD 260655 b [4] [5] and HD 260655 c, that were discovered in 2022. Both planets were detected by the TESS mission and confirmed independently with archival and new precise radial velocity data obtained with the HIRES observatory since 1998, and the CARMENES survey instruments since 2016. [2]

Contents

Star

The star is among the earliest-type M dwarfs in the night sky. Its mass is 0.439 times that of the Sun, and its radius is also 0.439 times that of the Sun. It has a temperature of 3,803  K (3,530  °C ; 6,386  °F ) and a rotation period of 37.5 days. [2] Other designations of HD 260655 include Wolf 287, GJ 239, TOI-4599, HIP 31635 and LHS 1858. [3]

Planetary system

Artist's impression of the planets of HD 260655. HD 260655 artist's impression.jpg
Artist's impression of the planets of HD 260655.

The mass of planet b is 2.14  ME, with a radius of 1.240  R🜨, and planet c has a mass of 3.09  ME, with a radius of 1.533  R🜨, making both planets super-Earths. [2] The equilibrium temperature of HD 260655 b is 709  K (436  °C ; 817  °F ), while HD 260655 c sits at a temperature of 557  K (284  °C ; 543  °F ). [2] [6] The orbital period of HD 260655 b is 2.77 days, while HD 260655 c has an orbital period of 5.71 days. [2]

Both planets are ideal candidates for future study of exoplanet atmospheres due to their closeness and their bright red dwarf star. However, as of 2022, there is no evidence that HD 260655 b or HD 260655 c have atmospheres. [7] HD 260655 is also the fourth-closest known system with multiple transiting exoplanets, after HD 219134, LTT 1445, and AU Microscopii. [8]

The HD 260655 planetary system [2]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b2.14±0.34  M🜨 0.02933±0.000242.76953±0.000030.039+0.043
−0.023		87.35±0.14 ° 1.240±0.023  R🜨
c3.09±0.48  M🜨 0.04749±0.000395.70588±0.000070.038+0.036
−0.022		87.79±0.08 ° 1.533+0.051
−0.046  R🜨

Related Research Articles

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<span class="mw-page-title-main">Epsilon Reticuli</span> Star in the constellation Reticulum

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<span class="mw-page-title-main">Discoveries of exoplanets</span> Detecting planets located outside the Solar System

An exoplanet is a planet located outside the Solar System. The first evidence of an exoplanet was noted as early as 1917, but was not recognized as such until 2016; no planet discovery has yet come from that evidence. What turned out to be the first detection of an exoplanet was published among a list of possible candidates in 1988, though not confirmed until 2003. The first confirmed detection came in 1992, with the discovery of terrestrial-mass planets orbiting the pulsar PSR B1257+12. The first confirmation of an exoplanet orbiting a main-sequence star was made in 1995, when a giant planet was found in a four-day orbit around the nearby star 51 Pegasi. Some exoplanets have been imaged directly by telescopes, but the vast majority have been detected through indirect methods, such as the transit method and the radial-velocity method. As of 24 July 2024, there are 7,026 confirmed exoplanets in 4,949 planetary systems, with 1007 systems having more than one planet. This is a list of the most notable discoveries.

<span class="mw-page-title-main">Gliese 357</span> Red dwarf with low starspot activity in the Hydra constellation

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<span class="mw-page-title-main">HD 189567</span> Star in the constellation Pavo

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L 168-9 is a red dwarf star located 82.1 light-years away from the Solar System in the constellation of Tucana. The star has about 61% the mass and 60% the radius of the Sun. It has a temperature of 3,842 K and a rotation period of 29 days. L 168-9 is orbited by one known exoplanet.

References

  1. 1 2 3 4 5 6 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.
  2. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Luque, R.; Fulton, B. J.; Kunimoto, M.; Amado, P. J.; Gorrini, P.; Dreizler, S.; Hellier, C.; Henry, G. W.; Molaverdikhani, K.; Morello, G.; Peña-Moñino, L. (2022-04-21). "The HD 260655 system: Two rocky worlds transiting a bright M dwarf at 10 pc". Astronomy & Astrophysics. 664: A199. arXiv: 2204.10261 . Bibcode:2022A&A...664A.199L. doi:10.1051/0004-6361/202243834. S2CID   248300168.
  3. 1 2 "HD 260655". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2022-07-31.
  4. ↑ "The Extrasolar Planet Encyclopaedia — HD 260655 c". Extrasolar Planets Encyclopaedia . Retrieved 2022-07-01.
  5. ↑ Carter, Jamie. "Found: Two New Rocky, Earth-Sized Planets In Our Cosmic Backyard—And There Could Be More". Forbes. Retrieved 2022-07-01.
  6. 1 2 Brennan, Pat. "Discovery Alert: Two New, Rocky Planets in the Solar Neighborhood". Exoplanet Exploration: Planets Beyond our Solar System. Retrieved 2022-07-01.
  7. ↑ "Two rocky super-Earths discovered just 33 light-years away". Digital Trends. 2022-06-19. Retrieved 2022-07-01.
  8. ↑ "Two Rocky Exoplanets Found Orbiting Bright Red Dwarf | Sci-News.com". Breaking Science News | Sci-News.com. 10 May 2022. Retrieved 2022-07-01.
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