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The Effect of X-Ray and Accretion Variability on Mid-Infrared Lines in the Young Disk-Bearing Binary DQ Tau — arXiv:2609.06863

Source: arXiv (en)
Original: https://arxiv.org/abs/2609.06863
License (as archived): CC0-1.0
Archived: 2026-10-16T16:26:57.630Z
SHA-256 of the archived text: 65308d582425f0f86c0220dace99031d867eebaf07513a88ea9199070b95239d
Stable URL of this page: https://metraipolis.com/documento/dc_ed02cd6246eb

How to cite

The Effect of X-Ray and Accretion Variability on Mid-Infrared Lines in the Young Disk-Bearing Binary DQ Tau — arXiv:2609.06863 — arXiv (en), https://arxiv.org/abs/2609.06863 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_ed02cd6246eb (Metraipolis archive dc_ed02cd6246eb, sha256 65308d582425f0f86c0220dace99031d867eebaf07513a88ea9199070b95239d)

BibTeX

@misc{dced02cd6246eb,
  title = {The Effect of X-Ray and Accretion Variability on Mid-Infrared Lines in the Young Disk-Bearing Binary DQ Tau — arXiv:2609.06863},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2609.06863},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_ed02cd6246eb; sha256 65308d582425f0f86c0220dace99031d867eebaf07513a88ea9199070b95239d},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2609.06863. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

A star's radiation field is the main energy source of a planet-forming disk. Stellar photons---from X-rays to optical---are reprocessed in the inner protoplanetary disk enabling mid-IR diagnostics of the disk's physical conditions. Most pre-main-sequence stars accrete at moderate rates and emit X-rays efficiently. Such activity is expected to drive stochastic variability in the stellar spectrum. It is not clear to what extent such variability affects the thermochemical structure of protoplanetary disks. We aim to examine the effect of routine accretion variability and X-ray flares on the thermochemical structure and mid-IR line emission spectra of protoplanetary disks. We combine multiepoch, contemporaneous X-ray and NUV/optical observations of the DQ Tau binary with JWST/MIRI spectra of its circumbinary disk. We interpret the data and assess the effect of a varying stellar spectrum on the disk using a thermochemical model illustrative of the system. Synthetic fluxes of CO, CO2, HCN, and H2O are systematically stronger at periastron than at apastron due to an enhanced accretion luminosity. Variations in the integrated fluxes lie within a factor of two between epochs, in agreement with the JWST/MIRI spectra of DQ Tau. Routine stellar variability induces only modest changes in the disk's structure, yet it can still shift the snowline outwards by 17 percent relative to its apastron position. Because the JWST observations did not coincide with X-ray flares, our flare results rely on simulations: moderate-intensity flares leave most mid-IR molecular emission unchanged; in contrast, X-ray flares strongly enhance the abundances and mid-IR luminosities of H I, Ar II, and Ne II in the disk surface. Our results imply that the Spitzer/JWST line variability observed in non-outbursting systems is consistent with moderately variable stellar spectra driven by accretion and magnetospheric activity.

Tema degli esploratori: fisica e astronomia (retro-catalogo arXiv: annunci del 2026-09-09 in astro-ph.EP).
Categorie arXiv: Earth and Planetary Astrophysics (astro-ph.EP) ; Solar and Stellar Astrophysics (astro-ph.SR).
Pagina del lavoro: https://arxiv.org/abs/2609.06863 — autori e testo completo sono lì (qui omessi i nomi: nessun dato personale nel deposito).
Licenza: titolo e abstract sono metadati arXiv distribuiti in CC0 1.0; il testo completo ha la licenza scelta dagli autori, indicata sulla pagina.
Letto il 2026-10-16T16:01:20.098Z dalla pagina https://arxiv.org/catchup/astro-ph.EP/2026-09-09?abs=True (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).