GRAVITY+ observations yield a 12CO/13CO ratio of 91^{+24}_{-17} in β Pictoris b consistent with solar/ISM values and a tentative 1.4% atmospheric variability amplitude.
Distances, Luminosities, and Temperatures of the Coldest Known Substellar Objects
2 Pith papers cite this work. Polarity classification is still indexing.
2
Pith papers citing it
abstract
The coolest known brown dwarfs are our best analogs to extrasolar gas-giant planets. The prolific detections of such cold substellar objects in the past two years has spurred intensive followup, but the lack of accurate distances is a key gap in our understanding. We present a large sample of precise distances based on homogeneous mid-infrared astrometry that robustly establish absolute fluxes, luminosities, and temperatures. The coolest brown dwarfs have temperatures of 400-450 K and masses ~5-20 times that of Jupiter, showing they bridge the gap between hotter brown dwarfs and gas-giant planets. At these extremes, spectral energy distributions no longer follow a simple correspondence with temperature, suggesting an increasing role of other physical parameters such as surface gravity, vertical mixing, clouds, and metallicity.
fields
astro-ph.EP 2years
2026 2verdicts
UNVERDICTED 2representative citing papers
SKA-VLBI is projected to deliver an order-of-magnitude gain in astrometric precision, enabling detection of thousands of exoplanets around ultra-cool dwarfs, M dwarfs and young stars plus dynamical masses when companions are also imaged.
citing papers explorer
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$^{13}$CO and potential variability in $\beta$ Pictoris b with GRAVITY+
GRAVITY+ observations yield a 12CO/13CO ratio of 91^{+24}_{-17} in β Pictoris b consistent with solar/ISM values and a tentative 1.4% atmospheric variability amplitude.
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Ultra-Precise Astrometric Search for Exoplanets with SKA-VLBI
SKA-VLBI is projected to deliver an order-of-magnitude gain in astrometric precision, enabling detection of thousands of exoplanets around ultra-cool dwarfs, M dwarfs and young stars plus dynamical masses when companions are also imaged.