HD 135344
Template:Short description Template:Starbox begin Template:Starbox image Template:Starbox observe 2s Template:Starbox character Template:Starbox astrometry Template:Starbox detail Template:Starbox catalog Template:Starbox reference Template:Starbox end
HD 135344 is a young binary star system about 440 light-years away from Earth in the constellation Lupus. The primary star hosts a directly imaged gas giant planet, while the secondary star, also known as SAO 206462, is surrounded by a circumstellar disk of gas with clearly defined spiral arms and has three planet candidates.
HD 135344 A
HD 135344 A is an A-type main-sequence star. It hosts a directly imaged gas giant planet, about 10 times the mass of Jupiter, discovered in 2025 with VLT/SPHERE.[1]
Template:OrbitboxPlanet begin Template:OrbitboxPlanet Template:Orbitbox end
HD 135344 B
.jpg)
HD 135344 B, also known as SAO 206462, has been known to have a circumstellar disk since the 1990s, first detected based on an infrared excess.[2] Observations of the structure of the disk were presented in July 2009 by Carol Grady, astronomer of Eureka Scientific, headquartered in the Goddard Space Flight Center at NASA. It was the first of this class that exhibited a high degree of clarity and was observed using several space telescopes (Hubble, FUSE, Spitzer) and ground-based telescopes (Gemini Observatory and Subaru Telescope, situated in Hawaii), through an international research program of young stars and of stars with planets. A number of astronomers of different observatories collaborated.[3] The disk's diameter is about twice the size of the orbit of Pluto.[4] Template:Clear left
Evidence of planets
.jpg)
Template:OrbitboxPlanet begin Template:OrbitboxPlanet hypothetical Template:OrbitboxPlanet hypothetical Template:OrbitboxPlanet hypothetical Template:Orbitbox end
The pair of spiral arms around SAO 206462 have a rotation rate of Template:Val per year, which are thought to be caused by a dynamically driving protoplanet within the disk, at a distance of Template:Val and an orbital period of Template:Val. This planet should be a challenge to be detected using direct imaging due to the presence of dust particles obscuring it, but could be detected and confirmed via high-resolution spectroscopic observations.[5] One 2026 study refined the rotation rate to Template:Val and provided new evidence supporting the existence of the planet.[6]
Another planet candidate around SAO 206462 has been detected using observations of the JWST's NIRCam imaging instrument, with low signal-to-noise ratio, a mass of Template:Val and a separation of 300 astronomical units. It has been dubbed CC1 (Companion candidate 1). Objects more massive than Template:Val at distances of up to 120 AU have been ruled out by the observations.[7]
A third planet candidate was detected by direct imaging in 2025, at the root of one of the disk's spiral arms. The object has a mass estimated at Template:Jupiter mass, and is highly embedded in gas and dust, possibly having its own protoplanetary disk. It has a separation of 28 AU from the host star and is likely shepherding the inner part of the disk.[8] This exoplanet has been disputed in 2026, attributed to an artifact in the data processing.[6]
Notes
References
- ↑ Template:Cite simbad Cite error:
<ref>tag with name "SIMBAD1" defined in<references>is not used in prior text. - ↑ Template:Cite simbad Cite error:
<ref>tag with name "SIMBAD2" defined in<references>is not used in prior text. - ↑ Template:Cite Gaia DR3 Cite error:
<ref>tag with name "dr3a" defined in<references>is not used in prior text. - ↑ Template:Cite Gaia DR3 Cite error:
<ref>tag with name "dr3b" defined in<references>is not used in prior text. - ↑ Template:Cite constellation Cite error:
<ref>tag with name "constellation" defined in<references>is not used in prior text. - ↑ Template:Cite journal Cite error:
<ref>tag with name "tic" defined in<references>is not used in prior text. - ↑ Template:Cite journal Cite error:
<ref>tag with name "Mendigutia2026" defined in<references>is not used in prior text. - ↑ Template:Cite journal Cite error:
<ref>tag with name "gaspar2016" defined in<references>is not used in prior text. - ↑ Template:Cite journal
- ↑ Template:Cite journal
- ↑ Template:Cite journal
- ↑ Template:Cite web
- ↑ Template:Cite journal
- ↑ 6.0 6.1 Template:Cite journal
- ↑ Template:Cite journal
- ↑ Template:Cite journal