Serendipitous observation of a white dwarf companion to a JWST/MIRI coronagraphic calibrator
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866915027136544768 |
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| author | Venner, Alexander Limbach, Mary Anne Mâlin, Mathilde Blouin, Simon Boccaletti, Anthony Pearce, Logan A. |
| author_facet | Venner, Alexander Limbach, Mary Anne Mâlin, Mathilde Blouin, Simon Boccaletti, Anthony Pearce, Logan A. |
| contents | We present the unplanned detection of a white dwarf companion to the star HD 218261 in mid-infrared (10-16 $μ$m) observations with JWST/MIRI. This star was observed as a calibrator for coronagraphic observations of the exoplanet host HR 8799. HD 218261 B has only previously been detected by Gaia, and only in visible light. We confidently detect the companion in the mid-infrared, where it is less luminous than the primary by a factor of ~10$^4$. The visible and mid-infrared photometry are consistent with a white dwarf of $T_\text{eff}\approx10000$ K, $M\approx0.8 M_\odot$, though observation of its optical spectrum is required to precisely constrain its physical parameters. These results demonstrate that precise mid-infrared photometry of white dwarf companions to bright stars can be obtained with MIRI, opening up new possibilities for studying white dwarfs in close binaries. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2410_11568 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Serendipitous observation of a white dwarf companion to a JWST/MIRI coronagraphic calibrator Venner, Alexander Limbach, Mary Anne Mâlin, Mathilde Blouin, Simon Boccaletti, Anthony Pearce, Logan A. Solar and Stellar Astrophysics We present the unplanned detection of a white dwarf companion to the star HD 218261 in mid-infrared (10-16 $μ$m) observations with JWST/MIRI. This star was observed as a calibrator for coronagraphic observations of the exoplanet host HR 8799. HD 218261 B has only previously been detected by Gaia, and only in visible light. We confidently detect the companion in the mid-infrared, where it is less luminous than the primary by a factor of ~10$^4$. The visible and mid-infrared photometry are consistent with a white dwarf of $T_\text{eff}\approx10000$ K, $M\approx0.8 M_\odot$, though observation of its optical spectrum is required to precisely constrain its physical parameters. These results demonstrate that precise mid-infrared photometry of white dwarf companions to bright stars can be obtained with MIRI, opening up new possibilities for studying white dwarfs in close binaries. |
| title | Serendipitous observation of a white dwarf companion to a JWST/MIRI coronagraphic calibrator |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2410.11568 |