The News report of two confirmed unusual T-type brown dwarfs but they don't tell where in space or on the night sky they were found or how far they are from the Earth/Sun. The brown dwarfs are WISE 0414 and WISE 1810. Does anyone know where they are located?
$\begingroup$
$\endgroup$
Add a comment
|
1 Answer
$\begingroup$
$\endgroup$
The relevant research paper is Schneider et al. (2020) "WISEA J041451.67-585456.7 and WISEA J181006.18-101000.5: The First Extreme T-type Subdwarfs?".
This gives the full designations, of which WISE 0414 and WISE 1810 are abbreviated forms. The designations contain the J2000 coordinates (J041451.67-585456.7 refers to right ascension 04h14m51.67s, declination -58°54′56.7″). It turns out that WISE 0414 is in Reticulum and WISE 1810 is in Serpens (Cauda).
The distances are highly uncertain, from the paper:
If we proceed with absolute magnitude–spectral type relations for field brown dwarfs (Dupuy, & Liu 2012) and designate the spectral type of WISEA 1810−1010 to be T0, wildly discrepant distances are found for different passbands. We find a distance of ∼14 pc using WISEA 1810−1010’s W2 magnitude, but a distance of ∼67 pc using the K−band magnitude. Combined with our measured proper motion (Table 1), these distance estimates lead to a $V_\mathrm{tan}$ range of 77–360 km s−1. For WISEA 0414−5854, a similarly large distance range is found (52–94 pc), corresponding to a $V_\mathrm{tan}$ range of 170–307 km s−1. Parallax measurements for these objects will be necessary to determine accurate $V_\mathrm{tan}$ values. Nevertheless, it is clear that both sources are high velocity objects consistent with membership in the metal-poor Galactic thick disk or halo.
(emphasis mine)