CWISEP J1047+5457
{{short description|CWISEP J1047+5457 is a brown dwarf in the constellation Ursa Major.}}
{{Starbox begin
| name = CWISEP J1047+5457
}}
{{Starbox image
| image = 250px
| caption = Hubble WFC3 image of CWISEP J1047+5457 (blue cross-hair)
}}
{{Starbox observe
| epoch = J2000
| equinox = J2000
| constell = Ursa Major
| ra = {{RA|10|47|57.50}}
| dec = {{Dec|+54|57|42.17}}
}}
{{Starbox character
| type = brown dwarf
}}
{{Starbox astrometry
| prop_mo_ra = –447.9 ±41.7
| prop_mo_dec = –65.5 ±35.2
| parallax = 68.1
| p_error = 4.9
}}
{{Starbox detail
| temperature = {{val|415|20|22}}
| luminosity_bolometric = 10-6.582 ± 0.063
| mass_mj = 20.6 or 15.9 {{jupiter mass}} or
1–3
| radius_rj = 0.94 ± 0.07 or
0.98 ± 0.07
}}
{{Starbox catalog
| names =CWISEP J104756.81+545741.6
}}
{{Starbox reference
| Simbad =CWISEP+J104756.81%2B545741.6
}}
{{starbox end}}
CWISEP J1047+5457 (CWISEP J104756.81+545741.6, CWISEP J1047+54) is a Y-dwarf discovered in 2020.
CWISEP J1047+5457 was discovered in 2020 from a preliminary CatWISE catalog, initially determined to have a spectral type of Y0. Follow-up observations with JWST spectroscopy (NIRSpec and MIRI) showed that it had a spectral type of Y1. The observations showed that it had unusually strong carbon monoxide and carbon dioxide absorption. This causes the Spitzer ch1-ch2 color to be extremely blue (2.47 ±0.19 mag) for its spectral type and explains the misidentification as a Y0 in the discovery paper. The strong absorption might be explained with extreme disequilibrium chemistry, low surface gravity, or a low carbon to oxygen ratio. Other molecules, such as water vapor, methane and ammonia are also detected in the spectra. Phosphine is not detected.
Another study suspects this object to be young and low mass. The researchers find that increased amount of CO and CO2 can be explained with a low gravity. A low gravity is commonly associated with a young age for brown dwarfs. The researchers estimate a mass of less than 3 {{jupiter mass}} for an age of 200 Myr. The researchers also find a 52% likelyhood that it belongs to the 40 Myr old Argus association, which would lower the mass to around 1 {{jupiter mass}}. This would make it one of the lowest-mass free-floating planetary-mass objects.
See also
- List of Y-dwarfs
- CWISE J1055+5443 is another Y-dwarf with blue ch1-ch2 color, here this is explained with a young age
- List of star systems within 45–50 light-years