M51-ULS-1
Template:Starbox begin |Template:Starbox image |Template:Starbox observe |Template:Starbox character |Template:Starbox astrometry |Template:Starbox orbit |Template:Starbox detail |Template:Starbox catalog |Template:Starbox reference Template:Starbox end M51-ULS-1, also known as RX J132943+47115, is a high-mass X-ray binary (HMXB) system in the constellation of Canes Venatici.[1][2][3] The binary system is located in the Whirlpool Galaxy, a nearby spiral galaxy some 28 million light years (or 8.6 million parsecs) away.[1][2] The binary system has an apparent visual magnitude of 24.01.[1] The binary system was discovered in 1995 in a ROSAT survey of X-ray sources in the Whirlpool Galaxy and NGC 5195.[4]
Characteristics
M51-ULS-1 is a high-mass X-ray binary system in the Whirlpool Galaxy consisting of two components, a blue supergiant, and a compact object.[2][3][5] The binary system has a predicted age between 4 and 16 million years old; it was also found that the system is probably no older than 100 million years old.[3] The compact object orbits the more massive blue supergiant star in an orbit with a semi-major axis of 50 [[solar radius|Template:Solar radius]], and it was found that the semi-major axis of the binary is no larger than 3 astronomical units.[3]
The primary star, M51-ULS-1 A, is a massive, luminous early to late blue supergiant star.[2][3][6] The primary star has a spectral type of B2-8la discovered using Hubble Space Telescope photometry.[3] The primary star has a mass of about 20 [[solar mass|Template:Solar mass]].[2] Because of the star's mass it is predicted that the primary star might undergo a hydrogen-poor supernovae in the future.[3] The primary star has an estimated size of <25 Template:Solar radius,[3][6] based on a luminosity of ~260,000 Template:Solar luminosityTemplate:Efn and a derived effective temperature of approximately 26,000 K.[3]Template:Efn
The secondary object, M51-ULS-1 B, is a stellar remnant and is either a black hole or neutron star.[2][3][5] If the secondary object is a black hole, it would have a mass of 10 Template:Solar mass, classifying the secondary object as a stellar-mass black hole;[3] using its mass, it would have a Schwarzschild radius of roughly 30 kilometers.[3] If the secondary object is a neutron star, it would have mass of 1.4 Template:Solar mass.[3] It is known that the secondary object is accreting 10−6 Template:Solar mass worth of material every year from the primary star.[3] Template:Clear
Planetary system
In September 2020, a candidate exoplanet named M51-ULS-1 b was discovered in the system using the Chandra X-ray Observatory.[2][3][5] The putative exoplanet is mainly notable for being the first extragalactic planet candidate with strong evidence.[2][3][5] The potential exoplanet was detected by the eclipses of the X-ray source (XRS);[3] i. e. M51-ULS-1 B, the compact object orbiting the primary star. The candidate exoplanet is likely slightly smaller than the planet Saturn.[3][7] The unconfirmed exoplanet orbits both of the objects in the system in about 70 years, and has a semi-major axis of 45 AU.[2][3][5] It was suggested that the planet could be a white dwarf, however this was ruled out because of the fact it would cause a lensing event and not a dip in flux.[3] It was also proposed that it may be a cloud of gas, however the discoverers found this as an unlikely explanation.[3] Due to M51-ULS-1 b orbiting a potential black hole it may be classified as a blanet.
Template:OrbitboxPlanet begin Template:Orbitbox planet hypothetical Template:Orbitbox end
See also
- PA-99-N2, another system containing a potential extragalactic planet.
- M33 X-7, another extragalactic high-mass X-ray binary.
- Extragalactic planet
- Circumbinary planet
- Whirlpool Galaxy
Notes
References
Template:Stars of Canes Venatici Template:Extragalactic stars
- ↑ 1.0 1.1 1.2 Template:Cite simbad
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 Template:Cite web
- ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 3.20 Template:Cite web
- ↑ Template:Cite journal
- ↑ 5.0 5.1 5.2 5.3 5.4 Template:Cite web
- ↑ 6.0 6.1 Template:Cite journal
- ↑ Template:Cite web