 ROXs 42B and its companion (small red object on the right) with VLTMUSE | |
| Discovery | |
|---|---|
| Discovered by | Currie et al.[1] |
| Discovery site | Keck Telescope,Very Large Telescope,Subaru Telescope |
| Discovery date | October 17, 2013 |
| Direct imaging | |
| Orbital characteristics | |
| 1968.3years[2] | |
| Star | ROXs 42B |
| Physical characteristics | |
| 2.10±0.35[3]RJ | |
| Mass | 13±5[3]MJ |
| 3.2 - 12.8[3]g | |
| Temperature | 2240±150[3]K |
ROXs 42Bb is a directly imagedplanetary-mass companion[1] to the binary M star ROXs 42B,[4] a likely member of theRho Ophiuchi cloud complex. The companion was announced/discovered on October 17, 2013, byUniversity of Toronto astronomerThayne Currie.
The object has an estimated mass around 9 Jupiter masses, depending on the age of the star,[1] similar to the masses of directly imaged planets aroundHR 8799 andbeta Pictoris. However, it is unclear whether ROXs 42Bb formed like these planets via core accretion, by disk (gravitational) instability, or more like abinary star. Preliminary fits of the spectra and broadband photometry to atmospheric models imply a radius of2.43 ± 0.18 RJ for an effective temperature of about 2,000 K or a radius of2.55 ± 0.20 RJ for about 1950 K.[5] LikeBeta Pictoris b, ROXs 42Bb's atmosphere is likely very cloudy and dusty.[5]
The object is located in the constellationOphiuchus, near the border withScorpius.
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