Barnard's Star is among the most studied red dwarfs because of its proximity and favorable location for observation near thecelestial equator.[9] Historically, research on Barnard's Star has focused on measuring its stellar characteristics, itsastrometry, and also refining the limits of possibleextrasolar planets. Although Barnard's Star is ancient, it still experiencesstellar flare events, one being observed in 1998.[18]
Barnard's Star hosts a system of four close-orbiting, sub-Earth-mass planets (Barnard's Star b, c, d & e). Multiple claims for a planetary system had been proposed since the beginning of the twentieth century, notably byPeter van de Kamp in the 1960s, but none were supported by follow-up studies, until the now known four-planet system was discovered by two independent teams of astronomers in 2024-2025.[7][19]
In 2016, theInternational Astronomical Union organized aWorking Group on Star Names (WGSN)[22] to catalogue and standardize proper names for stars. The WGSN approved the nameBarnard's Star for this star on 1 February 2017 and it is now included in the List of IAU-approved Star Names.[23]
At 7–12 billion years of age, Barnard's Star is considerably older than the Sun, which is 4.5 billion years old, and it might be among the oldest stars in theMilky Way galaxy.[11] Barnard's Star has lost a great deal of rotational energy; the periodic slight changes in its brightness indicate that it rotates once in 130 days[24] (theSun rotates in 25). Given its age, Barnard's Star was long assumed to be quiescent in terms of stellar activity. In 1998, astronomers observed an intensestellar flare, showing that Barnard's Star is aflare star.[25] Barnard's Star has thevariable star designation V2500 Ophiuchi. In 2003, Barnard's Star presented the first detectable change in theradial velocity of a star caused by its motion. Further variability in the radial velocity of Barnard's Star was attributed to its stellar activity.[26]
Barnard's Star, showing position every 5 years in the period 1985–2005
The proper motion of Barnard's Star corresponds to a relative lateral speed of 90km/s. The 10.3 arcseconds it travels in a year amount to a quarter of a degree in a human lifetime, roughly half the angular diameter of the full Moon.[20]
The radial velocity of Barnard's Star is−110 km/s, as measured from theblueshift due to its motion toward the Sun. Combined with its proper motion and distance, this gives a"space velocity" (actual speed relative to the Sun) of142.6±0.2 km/s. Barnard's Star will make its closest approach to the Sun around 11,800 CE, when it will approach to within about 3.75 light-years.[27]
Distances to thenearest stars from 20,000 years ago until 80,000 years in the future
Proxima Centauri is the closest star to the Sun at a position currently 4.24 light-years distant from it. However, despite Barnard's Star's even closer pass to the Sun in 11,800 CE, it will still not then be the nearest star, since by that time Proxima Centauri will have moved to a yet-nearer proximity to the Sun.[28] At the time of the star's closest pass by the Sun, Barnard's Star will still be too dim to be seen with the naked eye, since its apparent magnitude will only have increased by one magnitude to about 8.5 by then, still being 2.5 magnitudes short of visibility to the naked eye.
Barnard's Star has a mass of about 0.16solar masses (M☉),[8] and a radius about 0.2 times that of the Sun.[9][29] Thus, although Barnard's Star has roughly 150 times the mass of Jupiter (MJ), its radius is only roughly 2 times larger, due to its much higher density. Itseffective temperature is about 3,220kelvin, and it has a luminosity of only 0.0034solar luminosities.[8] Barnard's Star is so faint that if it were at the same distance from Earth as the Sun is, it would appear only 100 times brighter than a full moon, comparable to the brightness of the Sun at 80astronomical units.[30]
Barnard's Star has 10–32% of the solarmetallicity.[4] Metallicity is the proportion of stellar mass made up of elements heavier thanhelium and helps classify stars relative to the galactic population. Barnard's Star seems to be typical of the old, red dwarfpopulation II stars, yet these are also generally metal-poorhalo stars. While sub-solar, Barnard's Star's metallicity is higher than that of a halo star and is in keeping with the low end of the metal-richdisk star range; this, plus its high space motion, have led to the designation "intermediate population II star", between a halo and disk star.[4][26] However, some recently published scientific papers have given much higher estimates for the metallicity of the star, very close to the Sun's level, between 75 and 125% of the solar metallicity.[31][32]
In August 2024, by using data fromESPRESSO spectrograph of theVery Large Telescope, the existence of an exoplanet with aminimum mass of0.37±0.05 M🜨 andorbital period of 3.15 days was confirmed. This constituted the first convincing evidence for a planet orbiting Barnard's Star. Additionally, three other candidate low-mass planets were proposed in this study. All of these planets orbit closer to the star than thehabitable zone.[33][7] The confirmed planet is designatedBarnard's Star b (or Barnard b), a re-use of the designation originally used for the refuted super-Earth candidate. An examination ofTESS photometry revealed noplanetary transits, implying that the system is not viewed edge-on.[34]
In March 2025, an independent follow-up study confirmed all four planets. The data ruled out planets with masses greater than0.57 M🜨 in the habitable zone of Barnard's Star with 99% confidence. With a minimum mass of only0.193 M🜨, Barnard's Star e is the least massive exoplanet yet detected by theradial velocity method. The best-fit orbital solution implies the planets have slightlyeccentric orbits, but simulations suggest that these orbits would be unstable while circular orbits remain stable, so the eccentricities may be overestimated.[19][35]
Barnard's Star has been subject to multiple claims of planets that were later disproven. From the early 1960s to the early 1970s,Peter van de Kamp argued that planets orbited Barnard's Star. His specific claims of largegas giants were refuted in the mid-1970s after much debate. In November 2018, a candidatesuper-Earth planetary companion was reported to orbit Barnard's Star. It was believed to have a minimum mass of3.2M🜨 and orbit at0.4 AU.[36] However, work presented in July 2021 refuted the existence of this planet.[37]
For a decade from 1963 to about 1973, a substantial number of astronomers accepted a claim byPeter van de Kamp that he had detected, by usingastrometry, a perturbation in theproper motion of Barnard's Star consistent with its having one or more planets comparable in mass withJupiter. Van de Kamp had been observing the star from 1938, attempting, with colleagues at theSproul Observatory atSwarthmore College, to find minuscule variations of onemicrometre in its position onphotographic plates consistent withorbital perturbations that would indicate a planetary companion; this involved as many as ten people averaging their results in looking at plates, to avoid systemic individual errors.[38] Van de Kamp's initial suggestion was a planet having about1.6MJ at a distance of 4.4AU in a slightly eccentric orbit,[39] and these measurements were apparently refined in a 1969 paper.[40] Later that year, Van de Kamp suggested that there were two planets of 1.1 and0.8MJ.[41]
Artist's conception of a planet in orbit around a red dwarf
Other astronomers subsequently repeated Van de Kamp's measurements, and two papers in 1973 undermined the claim of a planet or planets.George Gatewood and Heinrich Eichhorn, at a different observatory and using newer plate measuring techniques, failed to verify the planetary companion.[42] Another paper published by John L. Hershey four months earlier, also using the Swarthmore observatory, found that changes in the astrometric field of various stars correlated to the timing of adjustments and modifications that had been carried out on the refractor telescope's objective lens;[43] the claimed planet was attributed to an artifact of maintenance and upgrade work. The affair has been discussed as part of a broader scientific review.[44]
Van de Kamp never acknowledged any error and published a further claim of two planets' existence as late as 1982;[45] he died in 1995.Wulff Heintz, Van de Kamp's successor at Swarthmore and an expert ondouble stars, questioned his findings and began publishing criticisms from 1976 onwards. The two men were reported to have become estranged because of this.[46]
Artist's impression of the surface of asuper-Earth orbiting Barnard's Star[47]
In November 2018, an international team of astronomers announced the detection byradial velocity of a candidatesuper-Earth orbiting in relatively close proximity to Barnard's Star. Led by Ignasi Ribas of Spain their work, conducted over two decades of observation, provided strong evidence of the planet's existence.[36][48] However, the existence of the planet was refuted in 2021, when the radial velocity signal was found to originate from long-term activity on the star itself, related to its rotation.[37] Further studies in the following years confirmed this result.[49][7]
Dubbed Barnard's Star b, the planet was thought to be near the stellar system'ssnow line, which is an ideal spot for the icy accretion of proto-planetary material. It was thought to orbit at 0.4AU every 233 days and had a proposedminimum mass of3.2M🜨. The planet would have most likely been frigid, with an estimated surface temperature of about −170 °C (−274 °F), and lie outside Barnard Star's presumedhabitable zone. Direct imaging of the planet and its tell-talelight signature would have been possible in the decade after its discovery. Further faint and unaccounted-for perturbations in the system suggested there may be a second planetary companion even farther out.[50]
For the more than four decades between van de Kamp's rejected claim and the eventual announcement of a planet candidate, Barnard's Star was carefully studied and the mass and orbital boundaries for possible planets were slowly tightened.M dwarfs such as Barnard's Star are more easily studied than larger stars in this regard because their lower masses render perturbations more obvious.[51]
Null results for planetary companions continued throughout the 1980s and 1990s, includinginterferometric work with theHubble Space Telescope in 1999.[52] Gatewood was able to show in 1995 that planets with10MJ were impossible around Barnard's Star,[44] in a paper which helped refine the negative certainty regarding planetary objects in general.[53] In 1999, the Hubble work further excluded planetary companions of0.8MJ with an orbital period of less than 1,000 days (Jupiter's orbital period is 4,332 days),[52] while Kuerster determined in 2003 that within thehabitable zone around Barnard's Star, planets are not possible with an "M sini" value[note 1] greater than 7.5 times the mass of the Earth (M🜨), or with a mass greater than 3.1 times the mass of Neptune (much lower than van de Kamp's smallest suggested value).[26]
In 2013, a research paper was published that further refined planet mass boundaries for the star. Using radial velocity measurements, taken over a period of 25 years, from theLick andKeck Observatories and applyingMonte Carlo analysis for both circular and eccentric orbits, upper masses for planets out to 1,000-day orbits were determined. Planets above two Earth masses in orbits of less than 10 days were excluded, and planets of more than ten Earth masses out to a two-year orbit were also confidently ruled out. It was also discovered that the habitable zone of the star seemed to be devoid of roughly Earth-mass planets or larger, save for face-on orbits.[54][55]
Even though this research greatly restricted the possible properties of planets around Barnard's Star, it did not rule them out completely asterrestrial planets were always going to be difficult to detect.NASA'sSpace Interferometry Mission, which was to begin searching for extrasolar Earth-like planets, was reported to have chosen Barnard's Star as an early search target,[30] however the mission was shut down in 2010.[56]ESA's similarDarwin interferometry mission had the same goal, but was stripped of funding in 2007.[57]
The analysis of radial velocities that eventually led to the announcement of a candidate super-Earth orbiting Barnard's Star was also used to set more precise upper mass limits for possible planets, up to and within the habitable zone: a maximum of0.7M🜨 up to the inner edge and1.2M🜨 on the outer edge of the optimistic habitable zone, corresponding to orbital periods of up to 10 and 40 days respectively. Therefore, it appears that Barnard's Star indeed does not host Earth-mass planets or larger, in hot and temperate orbits, unlike other M-dwarf stars that commonly have these types of planets in close-in orbits.[36]
In 1998 astellar flare on Barnard's Star was detected based on changes in thespectral emissions on 17 July during an unrelated search for variations in the proper motion. Four years passed before the flare was fully analyzed, at which point it was suggested that the flare's temperature was 8,000K, more than twice the normal temperature of the star.[58] Given the essentially random nature of flares, Diane Paulson, one of the authors of that study, noted that "the star would be fantastic for amateurs to observe".[25]
The flare was surprising because intense stellar activity is not expected in stars of such age. Flares are not completely understood, but are believed to be caused by strongmagnetic fields, which suppressplasmaconvection and lead to sudden outbursts: strong magnetic fields occur in rapidly rotating stars, while old stars tend to rotate slowly. For Barnard's Star to undergo an event of such magnitude is thus presumed to be a rarity.[58] Research on the star's periodicity, or changes in stellar activity over a given timescale, also suggest it ought to be quiescent; 1998 research showed weak evidence for periodic variation in the star's brightness, noting only one possible starspot over 130 days.[24]
Stellar activity of this sort has created interest in using Barnard's Star as a proxy to understand similar stars. It is hoped that photometric studies of itsX-ray andUV emissions will shed light on the large population of old M dwarfs in the galaxy. Such research hasastrobiological implications: given that the habitable zones of M dwarfs are close to the star, any planet located therein would be strongly affected by solar flares,stellar winds, and plasma ejection events.[11]
In 2019, two additional ultravioletstellar flares were detected, each with far-ultraviolet energy of 3×1022 joules, together with one X-raystellar flare with energy 1.6×1022 joules. The flare rate observed to date is enough to cause loss of 87 Earth atmospheres per billion years through thermal processes and ≈3 Earth atmospheres per billion years through ion loss processes on Barnard's Star b.[59]
The position of Barnard's Star on aradar map among all stellar objects orstellar systems within 9 light years (ly) from the map's center, the Sun (Sol).
Barnard's Star shares much the same neighborhood as the Sun. The neighbors of Barnard's Star are generally of red dwarf size, the smallest and most common star type. Its closest neighbor is currently the red dwarfRoss 154, at a distance of 1.66parsecs (5.41 light-years). The Sun (5.98 light-years) andAlpha Centauri (6.47 light-years) are, respectively, the next closest systems.[30] From Barnard's Star, the Sun would appear on the diametrically opposite side of the sky at coordinates RA=5h 57m 48.5s, Dec=−04° 41′ 36″, in the westernmost part of the constellationMonoceros. The absolute magnitude of the Sun is 4.83, and at a distance of 1.834 parsecs, it would be a first-magnitude star, asPollux is from the Earth.[note 2]
Barnard's Star was studied as part ofProject Daedalus. Undertaken between 1973 and 1978, the study suggested that rapid, uncrewed travel to another star system was possible with existing or near-future technology.[60] Barnard's Star was chosen as a target partly because it was believed to have planets.[61]
The theoretical model suggested that a nuclear pulse rocket employingnuclear fusion (specifically, electron bombardment ofdeuterium andhelium-3) and accelerating for four years could achieve a velocity of 12% of thespeed of light. The star could then be reached in 50 years, within a human lifetime.[61] Along with detailed investigation of the star and any companions, theinterstellar medium would be examined and baseline astrometric readings performed.[60]
The initial Project Daedalus model sparked further theoretical research. In 1980,Robert Freitas suggested a more ambitious plan: aself-replicating spacecraft intended to search for and make contact withextraterrestrial life.[62] Built and launched inJupiter's orbit, it would reach Barnard's Star in 47 years under parameters similar to those of the original Project Daedalus. Once at the star, it would begin automated self-replication, constructing a factory, initially to manufacture exploratory probes and eventually to create a copy of the original spacecraft after 1,000 years.[62]
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