We’re back with direct imaging with Masayuki Kuzuhara.
They used the #Subaru#telescope to observe nearby accelerating stars and search for substellar companions.
They discovered 4 substellar companions, one of which is the brown dwarf HIP 21152 B. The spectrum reveals water and methane. They further modelled the orbit, giving them a dynamical mass of around 28 Mjup.#ExSSV
Another program is probing the multiplicity of 20 Y dwarfs. #AMI will not work for faint primaries, so they use a thing called #kernel#phase, using the telescope as an interferometer.
The WISE-0336 system is a Y-Y binary. For the 19 other targets they didn’t find anything, so they are looking at detection limits. #ExSSV
Fun fact: Nancy Grace Roman envisioned imaging reflect light planets and wrote a paper about it. Jason points out how fitting it is that this will be done with Roman.
The Roman coronagraph will provide a large increase in sensitivity and demonstrate some key technologies: dark hole digging, large deformable mirrors, …#ExSSV
The coronagraph is fully assembled: to the lower left you see the filters. In-air functional testing is complete so now they need to test it in vacuum.
Roman is expected to launch towards the end of 2026/mid of 2027! #ExSSV
Deuterium is more detectable at colder temperatures, in particular at 4.5 micron. HDO may be observable if CH4 is absent.
They looked at WISE 0855, the coldest known brown dwarf (gas giant analogue) They detected deuterium in this object using #JWST at high significance, consistence with proto-solar.
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