Spitzer + HST parallaxes of 13 late T and Y dwarfs
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866918380731105280 |
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| author | Marocco, Federico Kirkpatrick, J. Davy Smart, Richard L. Schneider, Adam C. Caselden, Dan Costa, Edgardo Cushing, Michael C. Dirk, Maximiliano Eisenhardt, Peter R. M . Faherty, Jacqueline K. Gelino, Christopher R. Kuchner, Marc J. Meisner, Aaron M. Mendez, Rene A. Stiller, Robert A. Wright, Edward L. |
| author_facet | Marocco, Federico Kirkpatrick, J. Davy Smart, Richard L. Schneider, Adam C. Caselden, Dan Costa, Edgardo Cushing, Michael C. Dirk, Maximiliano Eisenhardt, Peter R. M . Faherty, Jacqueline K. Gelino, Christopher R. Kuchner, Marc J. Meisner, Aaron M. Mendez, Rene A. Stiller, Robert A. Wright, Edward L. |
| contents | We present astrometric measurements for 13 cold brown dwarfs in the solar neighborhood (d < 20pc). By combining archival Spitzer data with our own Hubble Space Telescope (HST) observations, we achieve parallax uncertainties typically around 10%. Using Spitzer and HST photometry we compare our targets with other known late T and Y dwarfs in the Solar neighborhood, confirming that there is large intrinsic scatter in the near- and mid-infrared absolute magnitudes and colors of this population, further highlighting the diversity observed spectroscopically by several James Webb Space Telescope (JWST) programs. This scatter makes photometric distance estimates highly unreliable and, therefore, makes astrometric parallax measurements fundamental for a meaningful characterization of even the nearest cold brown dwarfs. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_08984 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Spitzer + HST parallaxes of 13 late T and Y dwarfs Marocco, Federico Kirkpatrick, J. Davy Smart, Richard L. Schneider, Adam C. Caselden, Dan Costa, Edgardo Cushing, Michael C. Dirk, Maximiliano Eisenhardt, Peter R. M . Faherty, Jacqueline K. Gelino, Christopher R. Kuchner, Marc J. Meisner, Aaron M. Mendez, Rene A. Stiller, Robert A. Wright, Edward L. Solar and Stellar Astrophysics We present astrometric measurements for 13 cold brown dwarfs in the solar neighborhood (d < 20pc). By combining archival Spitzer data with our own Hubble Space Telescope (HST) observations, we achieve parallax uncertainties typically around 10%. Using Spitzer and HST photometry we compare our targets with other known late T and Y dwarfs in the Solar neighborhood, confirming that there is large intrinsic scatter in the near- and mid-infrared absolute magnitudes and colors of this population, further highlighting the diversity observed spectroscopically by several James Webb Space Telescope (JWST) programs. This scatter makes photometric distance estimates highly unreliable and, therefore, makes astrometric parallax measurements fundamental for a meaningful characterization of even the nearest cold brown dwarfs. |
| title | Spitzer + HST parallaxes of 13 late T and Y dwarfs |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2603.08984 |