Relentless and complex transits from a planetesimal debris disc
| العنوان: | Relentless and complex transits from a planetesimal debris disc |
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| المؤلفون: | J Farihi, J J Hermes, T R Marsh, A J Mustill, M C Wyatt, J A Guidry, T G Wilson, S Redfield, P Izquierdo, O Toloza, B T Gänsicke, A Aungwerojwit, C Kaewmanee, V S Dhillon, A Swan |
| المساهمون: | Science & Technology Facilities Council, University of St Andrews. School of Physics and Astronomy |
| بيانات النشر: | Oxford University Press, 2022. |
| سنة النشر: | 2022 |
| مصطلحات موضوعية: | Earth and Planetary Astrophysics (astro-ph.EP), 010308 nuclear & particles physics, White dwarfs, FOS: Physical sciences, Astronomy and Astrophysics, Circumstellar matter, 3rd-DAS, 01 natural sciences, individual (WD 1054–226), [Stars], Planetary systems, QC Physics, Astrophysics - Solar and Stellar Astrophysics, 13. Climate action, Space and Planetary Science, 0103 physical sciences, QB Astronomy, 010303 astronomy & astrophysics, QC, Solar and Stellar Astrophysics (astro-ph.SR), Astrophysics - Earth and Planetary Astrophysics, QB |
| الوصف: | This article reports quasi-continuous transiting events towards WD 1054-226 at d=36.2 pc and V=16.0 mag, based on simultaneous, high-cadence, multi-wavelength imaging photometry using ULTRACAM over 18 nights from 2019 to 2020 March. The predominant period is 25.02 h, and corresponds to a circular orbit with blackbody Teq = 323 K, where a planetary surface can nominally support liquid water. The light curves reveal remarkable night-to-night similarity, with changes on longer timescales, and lack any transit-free segments of unocculted starlight. The most pronounced dimming components occur every 23.1 min -- exactly the 65th harmonic of the fundamental period -- with depths of up to several per cent, and no evident color dependence. Myriad additional harmonics are present, as well as at least two transiting features with independent periods. High-resolution optical spectra are consistent with stable, photospheric absorption by multiple, refractory metal species, with no indication of circumstellar gas. Spitzer observations demonstrate a lack of detectable dust emission, suggesting that the otherwise hidden circumstellar disk orbiting WD 1054-226 may be typical of polluted white dwarfs, and only detected via favorable geometry. Future observations are required to constrain the orbital eccentricity, but even if periastron is near the Roche limit, sublimation cannot drive mass loss in refractory parent bodies, and collisional disintegration is necessary for dust production. 22 pages, 2 tables, and 15 figures including the appendix, accepted to MNRAS |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 1745-3933 0035-8711 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::591bfb31a69f6eb1a5a9e5bd3e68c528 http://wrap.warwick.ac.uk/163575/1/WRAP-Relentless-and-complex-transits-from-a-planetesimal-debris-disc-Marsh-2022.pdf |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....591bfb31a69f6eb1a5a9e5bd3e68c528 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 17453933 00358711 |
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