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Temple of Heaven(μ Ara/μ Arae) is a similarsunlightThe orange star ofTemple of Heaven, about 50 from the earthLight year。This star hasPlanetary systemThere are already four planets, three of which have the same mass asJupiterQuite. The innermost one is the first one found“Hot Neptune "。
Temple of HeavenMass ratio ofsunlightSlightly larger, estimated at 1.1Solar mass。be based onironIs twice as abundant as the sun and is classified asMetal rich star。The surface temperature is similar to the sun, about 5800K。Estimate itsradius31.5% larger than the sun,luminosityIt is 75% brighter than the sun.
In terms of its age, it is expected thatChromosphere According to the observed activity level, different from the theoretical model, the age of Temple of Heaven μ should be 6410 million years or 1450 million years.Another way to estimate age is to matchStellar evolutionThe age suggested by this method is about 4.4 billion years.
Temple of Heaven μSpectrum typeIt is G3IV – V.G3 means that the color of this star is yellow, similar to our sun (G2V).This star may be about to exhaust its corehydrogen, about to enterSubgiant And this is reflected in itsbrightnessClassification is between IV（Subgiant ）And V（Main sequence starA sun like dwarf star).
Planetary system
Announce
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Compared with our solar system, the orbits of the three planets outside the Temple of Heaven μ are not drawn to scale.In the scale of this picture, the innermost planet position is on the edge of the central star disk.
In August 2006, four stars around the Temple of HeavenplanetWhen it was found, three of the larger ones weregas giant , size andJupiterApproach.The fourth on the innermost side has a mass close toUranus, may be a small gas giant, or a largeterrestrial planet。
find
In 2001,British Australian Planetary SearchThe team announced that it had foundTemple of Heaven μ bAnd planetary orbits around the Reticulum epsilon.This one is marked asTemple of Heaven μ bOf the planets, thought to be highcentrifugalThe orbital period is 743 days.The discovery is based on the analysis of stars pulled by planetsgravitationResultingradial velocity (MeasurementStellar spectral lineOfDoppler shift）Change.
Further observation shows that there is anothercelestial bodies(Altar of Heaven μ c) exists. This discovery was published in 2004, but there were still very few parameters about this planet at that time, only its orbital period was about 8.2yearAnd has a high eccentricity.
In late 2004, a smaller and more inboard planet was identified asTemple of Heaven, μ d, the quality is about the same asUranusSimilarly, the revolution cycle is only 9day。This is the first "hot Neptune" type planet discovered, using high-precisionHigh precision radial velocity planet search(HARPS)SpectrographMeasure radial velocity.
In 2006, two groups, led by Krzysztof Go ź dziewski and Francesco Pepe, independently announced the use of radial velocity to measure the fourth planet.The newly discovered planet is named Temple of Heaven μ e and runs in a nearly circular orbit with a period of about 311 days.The new model modifies the previously known parameters of the planet and makes the planet run at a lower eccentricity than the previous model.Temple of Heaven μ is the successor55 Cancri After that, the second one with four planetsOuter solar system。
System structure
The system of Temple of Heaven μ includes a planet with the mass of Uranus, which is close to the inner side with an orbital period of 9 days, and three massive planets that may all be gas giants, which operate in a nearly circular orbit in a wide space (compared with the high eccentricity observed for a long timeExtrasolar planets).Uranus mass planets may be giant planets whose peripheral gas is stripped by star radiationnucleus, may be aChthonian planet ；Another possible choice is that the inner side of the μ system of the Temple of Heaven is dominated by rocks“Super Earth"。
The gas giants "e" and "b" close to the inner side are at 1:2Resonance orbit, making them have a strong interaction.The most suitable solution is that the system is actually unstable: the numerical simulation believes that the system will be destroyed after 78 million years, so it is estimated that the age of the system is significantly shorter than that of the solar system.The more stable solution, including that these two planets are actually resonant parts (similar toGliese 876) is only slightly better than the worst case (it is also doomed to be destroyed).
yesAstrolabeThe evidence searched shows that there is no similar phenomenon near the Temple of HeavenAncient cypress beltThe debris is surrounded by.If there is no ancient cypress belt in Temple of Heaven, it may be too dim to be detected by the instrument.
Habitability
The gas giant star "b" is located at the distance where μ in the Temple of Heaven can keep water liquid.This may inhibit the Earth like planets fromHabitable zoneInternal formation, but the size of gas giant starsNatural satelliteorTroyIt can still maintain the existence of liquid water.In other words, considering the existing calibration method with mass between planets and satellites, it is not clear whether there are satellites with enough mass to form and surround gas giant stars.In addition, measure theultraviolet raysflowAny potentialHabitableNeither planet nor satellite receives enough ultraviolet light to triggerBiomoleculeFormation of.
Planet "e" may receive as much ultraviolet radiation as the earth, so it is located atUV habitable areaBut it is too hot there to keep liquid water on the surface of the satellite
Disputes over the naming of planets
This article is rightExoplanetAre named in the order of discovery, in lowercaseRoman alphabetStart with "b".This system was used by the team led by Go ź dziewski.This article uses this method to express, and is compatible with the previous model of three planets.
On the other hand, the team led by Pepe proposed to modify the naming system, ranking the planets according to the characteristics described.Because the parameters of the outermost planets are suppressed, the previous model did not introduce the four planets enough, resulting in different arrangement of planets in the Altar of Heaven.Both systems agree that the 670 day cycle planet is "b".Pepe system names the planet with a cycle of 9 days as "c", the planet with a cycle of 310 days as "d", and the outermost planet as "e".
becauseInternational Astronomical UnionThe official method of naming exoplanets has not yet been defined, so what is "correct" is still an open issue.[1]
