K<SUB>s</SUB>-band Photometry of the Extreme T Subdwarf CWISE J221706.28‑145437.6

Bibcode
2025RNAAS...9..176Z
DOI
10.3847/2515-5172/aded0b
Zhang, Jerry J. -Y.; Lodieu, Nicolas; Martín, Eduardo L.
Bibliographical reference

Research Notes of the American Astronomical Society

Advertised on:
7
2025
Number of authors
3
IAC number of authors
3
Citations
0
Refereed citations
0
Description
We present deep Ks-band imaging of the extreme T subdwarf CWISE J221706.28‑145437.6. Using the new photometry, we construct its spectral energy distribution and find this object exhibits exceptionally strong collision-induced absorption in the H and K band. The comparison with the nearest benchmark extreme T subdwarf WISEA J181006.18‑101000.5 suggests the object would be cooler and more metal-poor than the benchmark. *Based on observations made with the Gran Telescopio Canarias.
Type
Non-refereed
Broad band photometry

It may interest you

  • Non-refereed
    The Solar Internal Rotation Project I: Data sets
    Helioseismology is a powerful tool to probe the internal structure and dynamics of the Sun. However, it requires long uninterrupted datasets to extract the rotational splittings with the highest precision. Two types of facilities were developed. On the one hand, ground-based telescopes such as the Birmingham Solar Oscillation Network (BiSON) and
    García, Rafael A. et al.

    Advertised on:

    2
    2025
    Bibcode
    2025ghh..confP.114G
    Citations
    0
  • Non-refereed
    A new perspective on the solar internal rotation from fitting long and very long time-series.
    With some 14, 15 and 29 years of HMI, MDI and GONG observations, respectively, we have reached a new milestone in acquiring almost three decades of nearly continuous helioseismic observations. Moreover, an alternative fitting methodology to the respective projects global helioseismic pipeline has produced tables of individual mode frequencies based
    Korzennik, Sylvain et al.

    Advertised on:

    2
    2025
    Bibcode
    2025ghh..confE..31K
    Citations
    0
  • Non-refereed
    Possible Role of Strong Acoustic Scatterers in Disposing of Radiative Flux Blocked by Sunspots
    Phase-correlation helioseismic holography of large sunspot in the 2.5--4.5-mHz p-mode spectrum, by Broock, Donea, Martinez & Lindsey show a signature that could be explained by fragmentation of magnetic flux into thin strands within the top few hundred km of sunspot subphotospheres. If so, this reinforces a hypothesis by Parker that such a
    Broock, Elena et al.

    Advertised on:

    2
    2025
    Bibcode
    2025ghh..confP.113B
    Citations
    0